Supercite

This document describes Supercite, an Emacs package for citing and attributing replies to mail and news messages.

Copyright © 1993, 2001–2024 Free Software Foundation, Inc.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, with the Front-Cover Texts being “A GNU Manual”, and with the Back-Cover Texts as in (a) below. A copy of the license is included in the section entitled “GNU Free Documentation License”.

(a) The FSF’s Back-Cover Text is: “You have the freedom to copy and modify this GNU manual.”

The manual is divided into the following chapters.

Table of Contents

Short Table of Contents

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1 Introduction

Supercite is a GNU Emacs package written entirely in Emacs Lisp. It interfaces to most of the commonly used Emacs mail user agents (MUAs) and news user agents (NUAs), and provides sophisticated facilities for the citing and attributing of message replies. Supercite has a very specific and limited role in the process of composing replies to both USENET network news and electronic mail.

The preferred way to spell Supercite is with a capital ‘S’, lowercase ‘upercite’.

Supercite is only useful in conjunction with MUAs and NUAs such as VM, Gnus, RMAIL, MH-E, etc. Supercite is typically called by the MUA after a reply buffer has been setup. Thereafter, Supercite’s many commands and formatting styles are available in that reply buffer until the reply is sent. Supercite is re-initialized in each new reply buffer.

1.1 Usage Overview

Typical usage is as follows. You want to reply or followup to a message in your MUA. You will probably hit r (i.e., “reply”) or f (i.e., “forward”) to begin composing the reply. In response, the MUA will create a reply buffer and initialize the outgoing mail headers appropriately. The body of the reply will usually be empty at this point. You now decide that you would like to include part of the original message in your reply. To do this, you yank the original message into the reply buffer, typically with a key stroke such as C-c C-y. This sequence will invoke an MUA-specific function which fills the body of the reply with the original message and then attributes this text to its author. This is called citing and its effect is to prefix every line from the original message with a special text tag. Most MUAs provide some default style of citing; by using Supercite you gain a wider flexibility in the look and style of citations. Supercite’s only job is to cite the original message.

1.2 What Supercite Doesn’t Do

Because of this clear division of labor, there are useful features which are the sole responsibility of the MUA, even though it might seem that Supercite should provide them. For example, many people would like to be able to yank (and cite) only a portion of the original message. Since Supercite only modifies the text it finds in the reply buffer as set up by the MUA, it is the MUA’s responsibility to do partial yanking. See Reply Buffer Initialization.

Another potentially useful thing would be for Supercite to set up the outgoing mail headers with information it gleans from the reply buffer. But by previously agreed upon convention, any text above the mail-header-separator which separates mail headers from message bodies cannot be modified by Supercite. Supercite, in fact, doesn’t know anything about the meaning of these headers, and never ventures outside the designated region. See Hints to MUA Authors, for more details.

1.3 What Supercite Does

Supercite is invoked for the first time on a reply buffer via your MUA’s reply or forward command. This command will actually perform citations by calling a hook variable to which Supercite’s top-level function sc-cite-original has been added. When sc-cite-original is executed, the original message must be set up in a very specific way, but this is handled automatically by the MUA. See Hints to MUA Authors.

The first thing Supercite does, via sc-cite-original, is to parse through the original message’s mail headers. It saves this data in an information association list, or info alist. The information in this list is used in a number of places throughout Supercite. See Information Keys and the Info Alist.

After the mail header info is extracted, the headers are optionally removed (nuked) from the reply. Supercite then writes a reference header into the buffer. This reference header is a string carrying details about the citation it is about to perform.

Next, Supercite visits each line in the reply, transforming the line according to a customizable “script”. Lines which were not previously cited in the original message are given a citation, while already cited lines remain untouched, or are coerced to your preferred style. Finally, Supercite installs a keymap into the reply buffer so that you have access to Supercite’s post-yank formatting and reciting commands as you subsequently edit your reply. You can tell that Supercite has been installed into the reply buffer because that buffer’s modeline will display the minor mode string ‘SC’.

When the original message is cited by sc-cite-original, it will (optionally) be filled by Supercite. However, if you manually edit the cited text and want to re-fill it, you must use an add-on package such as filladapt or gin-mode. These packages can recognize Supercited text and will fill them appropriately. Emacs’s built-in filling routines, e.g., fill-paragraph, do not recognize cited text and will not re-fill them properly because it cannot guess the fill-prefix being used. See Post-yank Formatting Commands, for details.

As mentioned above, Supercite provides commands to recite or uncite regions of text in the reply buffer, and commands to perform other beautifications on the cited original text, maintaining consistent and informative citations throughout. Supercite tries to be as configurable as possible to allow for a wide range of personalized citation styles, but it is also immediately useful with the default configuration, once it has been properly connected to your MUA. See Getting Connected, for more details.

2 Citations

A citation is the acknowledgment of the original author of a mail message in the body of the reply. There are two basic citation styles which Supercite supports. The first, called nested citations is an anonymous form of citation; in other words, an indication is made that the cited line was written by someone other that the current message author (i.e., other than you, the person composing the reply), but no reference is made as to the identity of the original author. This style should look familiar since its use on the net is widespread. Here’s an example of what a message buffer would look like using nested citations after multiple replies:

>> John originally wrote this
>> and this as well
> Jane said that John didn't know
> what he was talking about
And that's what I think too.

Note that multiple inclusions of the original messages result in a nesting of the ‘>’ characters. This can sometimes be quite confusing when many levels of citations are included since it may be difficult or impossible to figure out who actually participated in the thread, and multiple nesting of ‘>’ characters can sometimes make the message very difficult for the eye to scan.

In non-nested citations, each cited line begins with an informative string attributing that line to the original author. Only the first level of attribution will be shown; subsequent citations don’t nest the citation strings. The above dialog might look like this when non-nested citations are used:

John> John originally wrote this
John> and this as well
Jane> Jane said that John didn't know
Jane> what he was talking about
And that's what I think too.

Notice here that my inclusion of Jane’s inclusion of John’s original message did not result in a line cited with ‘Jane>John>’.

Supercite supports both styles of citation, and the variable sc-nested-citation-p controls which style it will use when citing previously uncited text. When this variable is nil (the default), non-nested citations are used. When non-nil, nested citations are used.

2.1 Citation Elements

Citation strings are composed of one or more elements. Non-nested citations are composed of four elements, three of which are directly user definable. The elements are concatenated together, in this order:

  1. The citation leader. The citation leader is contained in the variable sc-citation-leader, and has the default value of a string containing four spaces.
  2. The attribution string. This element is supplied automatically by Supercite, based on your preferences and the original message’s mail headers, though you may be asked to confirm Supercite’s choice. See Selecting an Attribution, for more details.
  3. The citation delimiter. This string, contained in the variable sc-citation-delimiter visually separates the citation from the text of the line. This variable has a default value of ">" and for best results, the string should consist of only a single character.
  4. The citation separator. The citation separator is contained in the variable sc-citation-separator, and has the default value of a string containing a single space.

For example, suppose you were using the default values for the above variables, and Supercite provided the attribution string ‘Jane’. In this case, the composed, non-nested citation string used might be something like " Jane> ". This citation string will be inserted in front of every line in the original message that is not already cited.

Nested citations, being simpler than non-nested citations, are composed of the same elements, sans the attribution string. Supercite is smart enough to not put additional spaces between citation delimiters for multi-level nested citations.

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2.2 Recognizing Citations

Supercite also recognizes citations in the original article, and can transform these already cited lines in a number of ways. This is how Supercite suppresses the multiple citing of non-nested citations. Recognition of cited lines is controlled by variables analogous to those that make up the citation string as mentioned previously.

The variable sc-citation-leader-regexp describes how citation leaders can look, by default it matches any number of spaces or tabs. Note that since the lisp function looking-at is used to do the matching, if you change this variable it need not start with a leading "^".

Similarly, the variables sc-citation-delimiter-regexp and sc-citation-separator-regexp respectively describe how citation delimiters and separators can look. They follow the same rule as sc-citation-leader-regexp above.

When Supercite composes a citation string, it provides the attribution automatically. The analogous variable which handles recognition of the attribution part of citation strings is sc-citation-root-regexp. This variable describes the attribution root for both nested and non-nested citations. By default it can match zero-to-many alphanumeric characters (also “.”, “-”, and “_”). But in some situations, Supercite has to determine whether it is looking at a nested or non-nested citation. Thus the variable sc-citation-nonnested-root-regexp is used to describe only non-nested citation roots. It is important to remember that if you change sc-citation-root-regexp you should always also change sc-citation-nonnested-root-regexp.

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3 Information Keys and the Info Alist

Mail header information keys are nuggets of information that Supercite extracts from the various mail headers of the original message, placed in the reply buffer by the MUA. Information is kept in the Info Alist as key-value pairs, and can be retrieved for use in various places within Supercite, such as in header rewrite functions and attribution selection. Other bits of data, composed and created by Supercite, are also kept as key-value pairs in this alist. In the case of mail fields, the key is the name of the field, omitting the trailing colon. Info keys are always case insensitive (as are mail headers), and the value for a corresponding key can be retrieved from the alist with the sc-mail-field function. Thus, if the following fields were present in the original article:

Date: 08 April 1991, 17:32:09 EST
Subject: Better get out your asbestos suit

then, the following lisp constructs return:

(sc-mail-field "date")
==> "08 April 1991, 17:32:09 EST"

(sc-mail-field "subject")
==> "Better get out your asbestos suit"

Since the argument to sc-mail-field can be any string, it is possible that the mail field will not be present on the info alist (possibly because the mail header was not present in the original message). In this case, sc-mail-field will return the value of the variable sc-mumble.

Supercite always places all mail fields found in the yanked original article into the info alist. If possible, Supercite will also places the following keys into the info alist:

"sc-attribution"

the selected attribution string.

"sc-citation"

the non-nested citation string.

"sc-from-address"

email address extracted from the ‘From:’ field.

"sc-reply-address"

email address extracted from the ‘Reply-To:’ field.

"sc-sender-address"

email address extracted from the ‘Sender:’ field.

"sc-emailname"

email terminus extracted from the ‘From:’ field.

"sc-initials"

the author’s initials.

"sc-author"

the author’s full name.

"sc-firstname"

the author’s first name.

"sc-lastname"

the author’s last name.

"sc-middlename-1"

the author’s first middle name.

If the author’s name has more than one middle name, they will appear as info keys with the appropriate index (e.g., "sc-middlename-2", …). See Selecting an Attribution.

4 Reference Headers

Supercite will insert an informative reference header at the beginning of the cited body of text, which display more detail about the original article and provides the mapping between the attribution and the original author in non-nested citations. Whereas the citation string usually only contains a portion of the original author’s name, the reference header can contain such information as the author’s full name, email address, the original article’s subject, etc. In fact any information contained in the info alist can be inserted into a reference header.

There are a number of built-in header rewrite functions supplied by Supercite, but you can write your own custom header rewrite functions (perhaps using the built-in ones as examples). The variable sc-rewrite-header-list contains the list of such header rewrite functions. This list is consulted both when inserting the initial reference header, and when displaying electric references. See Electric References.

When Supercite is initially run on a reply buffer (via sc-cite-original), it will automatically call one of these functions. The one it uses is defined in the variable sc-preferred-header-style. The value of this variable is an integer which is an index into the sc-rewrite-header-list, beginning at zero.

4.1 The Built-in Header Rewrite Functions

Below are examples of the various built-in header rewrite functions. Please note the following: first, the text which appears in the examples below as infokey indicates that the corresponding value of the info key from the info alist will be inserted there. (see Information Keys and the Info Alist). For example, in sc-header-on-said below, date and from correspond to the values of the ‘Date:’ and ‘From:’ mail headers respectively.

Also, the string ">>>>>" below is really the value of the variable sc-reference-tag-string. This variable is used in all built-in header rewrite functions, and you can customize its value to change the tag string globally.

Finally, the references headers actually written may omit certain parts of the header if the info key associated with infokey is not present in the info alist. In fact, for all built-in headers, if the ‘From:’ field is not present in the mail headers, the entire reference header will be omitted (but this usually signals a serious problem either in your MUA or in Supercite’s installation).

sc-no-header

This function produces no header. It should be used instead of nil to produce a blank header. This header can possibly contain a blank line after the mail-header-separator line.

sc-no-blank-line-or-header

This function is similar to sc-no-header except that any blank line after the mail-header-separator line will be removed.

sc-header-on-said

>>>>> On date, from said:

sc-header-inarticle-writes

>>>>> In article message-id, from writes:

sc-header-regarding-adds

>>>>> Regarding subject; from adds:

sc-header-attributed-writes

>>>>> "sc-attribution" == sc-author <sc-reply-address> writes:

sc-header-author-writes

>>>>> sc-author writes:

sc-header-verbose

>>>>> On date,
>>>>> sc-author
>>>>> from the organization of organization
>>>>> who can be reached at: sc-reply-address
>>>>> (whose comments are cited below with: "sc-cite")
>>>>> had this to say in article message-id
>>>>> in newsgroups newsgroups
>>>>> concerning the subject of subject
>>>>> see references for more details

4.2 Electric References

By default, when Supercite cites the original message for the first time, it just goes ahead and inserts the reference header indexed by sc-preferred-header-style. However, you may want to select different reference headers based on the type of reply or forwarding you are doing. You may also want to preview the reference header before deciding whether to insert it into the reply buffer or not. Supercite provides an optional electric reference mode which you can drop into to give you this functionality.

If the variable sc-electric-references-p is non-nil, Supercite will bring up an electric reference mode buffer and place you into a recursive edit. The electric reference buffer is read-only, so you cannot directly modify the reference text until you exit electric references and insert the text into the reply buffer. But you can cycle through all the reference header rewrite functions in your sc-rewrite-header-list.

You can also set a new preferred header style, jump to any header, or jump to the preferred header. The header will be shown in the electric reference buffer and the header index and function name will appear in the echo area.

The following commands are available while in electric reference mode (shown here with their default key bindings):

sc-eref-next (n)

Displays the next reference header in the electric reference buffer. If the variable sc-electric-circular-p is non-nil, invoking sc-eref-next while viewing the last reference header in the list will wrap around to the first header.

sc-eref-prev (p)

Displays the previous reference header in the electric reference buffer. If the variable sc-electric-circular-p is non-nil, invoking sc-eref-prev will wrap around to the last header.

sc-eref-goto (g)

Goes to a specified reference header. The index (into the sc-rewrite-header-list) can be specified as a numeric argument to the command. Otherwise, Supercite will query you for the index in the minibuffer.

sc-eref-jump (j)

Display the preferred reference header, i.e., the one indexed by the current value of sc-preferred-header-style.

sc-eref-setn (s)

Set the preferred reference header (i.e., sc-preferred-header-style) to the currently displayed header.

sc-eref-exit (C-j, RET, and ESC C-c)

Exit from electric reference mode and insert the current header into the reply buffer.

sc-eref-abort (q, x)

Exit from electric reference mode without inserting the current header.

Supercite will execute the hook sc-electric-mode-hook before entering electric reference mode.

5 Getting Connected

In most cases, all that is necessary to begin using Supercite is to add the following to ~.emacs:

(add-hook 'mail-citation-hook 'sc-cite-original)

For more details of the process, read on…

Hitting C-c C-y in your MUA’s reply buffer yanks and cites the original message into the reply buffer. In reality, the citation of the original message is performed via a call through a configurable hook variable. The name of this variable has been agreed to in advance as part of the citation interface specification. By default this hook variable has a nil value, which the MUA recognizes to mean, “use your default citation function.” When you add Supercite’s citation function to the hook, thereby giving the variable a non-nil value, it tells the MUA to run the hook via run-hooks instead of using the default citation.

Early in Supercite’s development, the Supercite author, a few MUA authors, and some early Supercite users got together and agreed upon a standard interface between MUAs and citation packages (of which Supercite is currently the only known add-on :-). Supercite can probably be used with most Emacs MUAs, with a greater or lesser degree of effort.

To learn exactly how to connect Supercite to the software systems you are using, read the appropriate following sections. For details on the interface specifications, or if you are writing or maintaining an MUA, see Hints to MUA Authors.

The first thing that everyone should do, regardless of the MUA you are using is to set up Emacs so it will load Supercite at the appropriate time. This happens automatically if Supercite is distributed with your Emacs version. If not, you can set up an autoload for Supercite.

To do the latter, put the following in your .emacs file:

(autoload 'sc-cite-original "supercite" nil t)

The function sc-cite-original is the top-level Supercite function designed to be run from the citation hook. It expects ‘point’ and ‘mark’ to be set around the region to cite, and it expects the original article’s mail headers to be present within this region. Note that Supercite never touches any text outside this region. Note further that the region need not be active for sc-cite-original to do its job. See Hints to MUA Authors.

The other step in the getting connected process is to make sure your MUA calls sc-cite-original at the right time. As mentioned above, some MUAs handle this differently. Read the sections that follow pertaining to the MUAs you are using.

6 Replying and Yanking

This chapter explains what happens when you reply and yank an original message from an MUA.

6.1 Reply Buffer Initialization

Executing sc-cite-original performs the following steps as it initializes the reply buffer:

  1. Runs sc-pre-hook. This hook variable is run before sc-cite-original does any other work. You could conceivably use this hook to set certain Supercite variables based on the reply buffer’s mode or name (i.e., to do something different based on whether you are replying or following up to an article).
  2. Inserts Supercite’s keymap. Supercite provides a number of commands for performing post-yank modifications to the reply buffer. These commands are installed on Supercite’s top-level keymap. Since Supercite has to interface with a wide variety of MUAs, it does not install all of its commands directly into the reply buffer’s keymap. Instead, it puts its commands on a keymap prefix, then installs this prefix onto the buffer’s keymap. What this means is that you typically have to type more characters to invoke a Supercite command, but Supercite’s key bindings can be made much more consistent across MUAs.

    You can control what key Supercite uses as its keymap prefix by changing the variable sc-mode-map-prefix. By default, this variable is set to C-c C-p; a finger twister perhaps, but unfortunately the best default due to the scarcity of available key bindings in many MUAs.

  3. Turns on Supercite minor mode. The modeline of the reply buffer should indicate that Supercite is active in that buffer by displaying the string ‘SC’.
  4. Sets the “Undo Boundary.” Supercite sets an undo boundary before it begins to modify the original yanked text. This allows you to easily undo Supercite’s changes to affect alternative citing styles.
  5. Processes the mail headers. All previously retrieved info key-value pairs are deleted from the info alist, then the mail headers in the body of the yanked message are scanned. Info key-value pairs are created for each header found. Also, such useful information as the author’s name and email address are extracted. If the variable sc-mail-warn-if-non-rfc822-p is non-nil, then Supercite will warn you if it finds a mail header that does not conform to RFC 822 (or later). This is rare and indicates a problem either with your MUA or the original author’s MUA, or some MTA (mail transport agent) along the way.

    Once the info keys have been extracted from the mail headers, the headers are nuked from the reply buffer. You can control exactly which headers are removed or kept, but by default, all headers are removed.

    There are two variables which control mail header nuking. The variable sc-nuke-mail-headers controls the overall behavior of the header nuking routines. By setting this variable to 'all, you automatically nuke all mail headers. Likewise, setting this variable to 'none inhibits nuking of any mail headers. In between these extremes, you can tell Supercite to nuke only a specified list of mail headers by setting this variable to 'specified, or to keep only a specified list of headers by setting it to 'keep.

    If sc-nuke-mail-headers is set to 'specified or 'keep, then the variable sc-nuke-mail-header-list is consulted for the list of headers to nuke or keep. This variable contains a list of regular expressions. If the mail header line matches a regular expression in this list, the header will be nuked or kept. The line is matched against the regexp using looking-at rooted at the beginning of the line.

    If the variable sc-blank-lines-after-headers is non-nil, it contains the number of blank lines remaining in the buffer after mail headers are nuked. By default, only one blank line is left in the buffer.

  6. Selects the attribution and citation strings. Once the mail headers have been processed, Supercite selects a attribution string and a citation string which it will use to cite the original message. See Selecting an Attribution, for details.
  7. Cites the message body. After the selection of the attribution and citation strings, Supercite cites the original message by inserting the citation string prefix in front of every uncited line. You may not want Supercite to automatically cite very long messages however. For example, some email could contain a smaller header section followed by a huge uuencoded message. It wouldn’t make sense to cite the uuencoded message part when responding to the original author’s short preface. For this reason, Supercite provides a variable which limits the automatic citation of long messages to a certain maximum number of lines. The variable is called sc-cite-region-limit. If this variable contains an integer, messages with more lines that this will not be cited at all, and a warning message will be displayed. Supercite has performed everything necessary, though, for you to manually cite only the small portion of the original message that you want to use.

    If sc-cite-region-limit contains a non-nil value, the original message will always be cited, regardless of its size. If the variable contains the value nil, the region will never be cited automatically. Use this if you always want to be able to edit and cite the message manually.

    The variable sc-cite-blank-lines-p controls whether blank lines in the original message should be cited or not. If this variable is non-nil, blank lines will be cited just like non-blank lines. Otherwise, blank lines will be treated as paragraph separators.

    Citing of the original message is highly configurable. Supercite’s default setup does a pretty good job of citing many common forms of previously cited messages. But there are as many citation styles out there as people on the net, or just about! It would be impossible for Supercite to anticipate every style in existence, and you probably wouldn’t encounter them all anyway. But you can configure Supercite to recognize those styles you see often. See Configuring the Citation Engine, for details.

  8. Runs sc-post-hook. This variable is very similar to sc-pre-hook, except that it runs after sc-cite-original is finished. This hook is provided mostly for completeness and backward compatibility. Perhaps it could be used to reset certain variables set in sc-pre-hook.

6.2 Filling Cited Text

Supercite will automatically fill newly cited text from the original message unless the variable sc-auto-fill-region-p has a nil value. Supercite will also re-fill paragraphs when you manually cite or re-cite text.

However, during normal editing, Supercite itself cannot be used to fill paragraphs. This is a change from version 2. There are other add-on lisp packages which do filling much better than Supercite ever did. The two best known are filladapt and gin-mode. Both work well with Supercite and both are available at the normal Emacs Lisp archive sites. gin-mode works pretty well out of the box, but if you use filladapt, you may want to run the function sc-setup-filladapt after loading supercite (e.g., using with-eval-after-load). This simply makes filladapt a little more Supercite savvy than its default setup.

Also, Supercite will collapse leading whitespace between the citation string and the text on a line when the variable sc-fixup-whitespace-p is non-nil. The default value for this variable is nil.

Its important to understand that Supercite’s automatic filling (during the initial citation of the reply) is very fragile. That is because figuring out the fill-prefix for a particular paragraph is a really hard thing to do automatically. This is especially the case when the original message contains code or some other text where leading whitespace is important to preserve. For this reason, many Supercite users typically run with sc-auto-fill-region-p (and possibly also sc-fixup-whitespace-p) set to nil. They then manually fill each cited paragraph in the reply buffer.

I usually run with both these variables containing their default values. When Supercite’s automatic filling breaks on a particular message, I will use Emacs’s undo feature to undo back before the citation was applied to the original message. Then I’ll toggle the variables and manually cite those paragraphs that I don’t want to fill or collapse whitespace on. See Variable Toggling Shortcuts.

If you find that Supercite’s automatic filling is just too fragile for your tastes, you might consider one of these alternate approaches. Also, to make life easier, a shortcut function to toggle the state of both of these variables is provided on the key binding C-c C-p C-p (with the default value of sc-mode-map-prefix; see Post-yank Formatting Commands).

You will noticed that the minor mode string will show the state of these variables as qualifier characters. When both variables are nil, the Supercite minor mode string will display ‘SC’. When just sc-auto-fill-region-p is non-nil, the string will display ‘SC:f’, and when just sc-fixup-whitespace-p is non-nil, the string will display ‘SC:w’. When both variables are non-nil, the string will display ‘SC:fw’. Note that the qualifiers chosen are mnemonics for the default bindings of the toggling function for each respective variable. See Variable Toggling Shortcuts.

Why are these variables not set to nil by default? It is because many users won’t manually fill paragraphs that are Supercited, and there have been widespread complaints on the net about mail and news messages containing lines greater than about 72 characters. So the default is to fill cited text.

7 Selecting an Attribution

As you know, the attribution string is the part of the author’s name that will be used to composed a non-nested citation string. Supercite scans the various mail headers present in the original article and uses a number of heuristics to extract strings which it puts into the attribution association list or attribution alist. This is analogous, but different from, the info alist previously mentioned. Each element in the attribution alist is a key-value pair containing such information as the author’s first name, middle names, and last name, the author’s initials, and the author’s email terminus.

7.1 Attribution Preferences

When you cite an original message, you can tell Supercite which part of the author’s name you would prefer it to use as the attribution. The variable sc-preferred-attribution-list controls this; it contains keys which are matched against the attribution alist in the given order. The first value of a key that produces a non-nil, non-empty string match is used as the attribution string, and if no keys match, a secondary mechanism is used to generate the attribution. See Anonymous Attributions.

The following preferences are always available in the attribution alist (barring error):

"emailname"

the author’s email terminus.

"initials"

the author’s initials.

"firstname"

the author’s first name.

"lastname"

the author’s last name.

"middlename-1"

the author’s first middle name.

"sc-lastchoice"

the last attribution string you have selected. This is useful when you recite paragraphs in the reply.

"sc-consult"

consults the customizable list sc-attrib-selection-list which can be used to select special attributions based on the value of any info key. See below for details.

"x-attribution"

the original author’s suggestion for attribution string choice. See below for details.

Middle name indexes can be any positive integer greater than zero, though it is unlikely that many authors will have more than one middle name, if that many.

At this point, let me digress into a discussion of etiquette. It is my belief that while the style of the citations is a reflection of the personal tastes of the replier (i.e., you), the attribution selection is ultimately the personal choice of the original author. In a sense it is his or her “net nickname”, and therefore the author should have some say in the selection of attribution string. Imagine how you would feel if someone gave you a nickname that you didn’t like?

For this reason, Supercite recognizes a special mail header, ‘X-Attribution:’, which if present, tells Supercite the attribution string preferred by the original author. It is the value of this header that is associated with the "x-attribution" key in the attribution alist. Currently, you can override the preference of this key by changing sc-preferred-attribution-list, but that isn’t polite, and in the future Supercite may hard-code this. For now, it is suggested that if you change the order of the keys in this list, that "x-attribution" always be first, or possible second behind only "sc-lastchoice". This latter is the default.

The value "sc-consult" in sc-preferred-attribution-list has a special meaning during attribution selection. When Supercite encounters this preference, it begins processing a customizable list of attributions, contained in the variable sc-attrib-selection-list. Each element in this list contains lists of the following form:

(infokey ((regexp . attribution)
         (regexp . attribution)
         (…)))

where infokey is a key for sc-mail-field and regexp is a regular expression to match against the infokey’s value. If regexp matches the infokey’s value, the attribution is used as the attribution string. Actually, attribution can be a string or a list; if it is a list, it is evaluated and the return value (which must be a string), is used as the attribution.

This can be very useful for when you are replying to net acquaintances who do not use the ‘X-Attribution:’ mail header. You may know what nickname they would prefer to use, and you can set up this list to match against a specific mail field, e.g., ‘From:’, allowing you to cite your friend’s message with the appropriate attribution.

7.2 Anonymous Attributions

When the author’s name cannot be found in the ‘From:’ mail header, a fallback author name and attribution string must be supplied. The fallback author name is contained in the variable sc-default-author-name and the fallback attribution string is contained in the variable sc-default-attribution. Default values for these variables are "Anonymous" and "Anon", respectively. Note that in most circumstances, getting the default author name or attribution is a sign that something is set up incorrectly.

Also, if the preferred attribution, which you specified in your sc-preferred-attribution-list variable cannot be found, a secondary method can be employed to find a valid attribution string. The variable sc-use-only-preference-p controls what happens in this case. If the variable’s value is non-nil, then sc-default-author-name and sc-default-attribution are used, otherwise, the following steps are taken to find a valid attribution string, and the first step to return a non-nil, non-empty string becomes the attribution:

  1. Use the last selected attribution, if there is one.
  2. Use the value of the "x-attribution" key.
  3. Use the author’s first name.
  4. Use the author’s last name.
  5. Use the author’s initials.
  6. Find the first non-nil, non-empty attribution string in the attribution alist.
  7. sc-default-attribution is used.

Once the attribution string has been automatically selected, a number of things can happen. If the variable sc-confirm-always-p is non-nil, you are queried for confirmation of the chosen attribution string. The possible values for completion are those strings in the attribution alist, however you are not limited to these choices. You can type any arbitrary string at the confirmation prompt. The string you enter becomes the value associated with the "sc-lastchoice" key in the attribution alist.

Once an attribution string has been selected, Supercite will force the string to lower case if the variable sc-downcase-p is non-nil.

Two hook variables provide even greater control of the attribution selection process. The hook sc-attribs-preselect-hook is run before any attribution is selected. Likewise, the hook sc-attribs-postselect-hook is run after the attribution is selected (and the corresponding citation string is built), but before these values are committed for use by Supercite. During the post-selection hook, the local variables attribution and citation are bound to the appropriate strings. By changing these variables in your hook functions, you change the attribution and citation strings used by Supercite. One possible use of this would be to override any automatically derived attribution string when it is only one character long; e.g., you prefer to use "initials" but the author only has one name.

7.3 Author Names

Supercite employs a number of heuristics to decipher the author’s name based on value of the ‘From:’ mail field of the original message. Supercite can recognize almost all of the common ‘From:’ field formats in use. If you encounter a ‘From:’ field that Supercite cannot parse, please report this bug using M-x report-emacs-bug.

There are a number of Supercite variables that control how author names are extracted from the ‘From:’ header. Some headers may contain a descriptive title as in:

From: computer!speedy!doe (John Xavier-Doe -- Decent Hacker)

Supercite knows which part of the ‘From:’ header is email address and which part is author name, but in this case the string "Decent Hacker" is not part of the author’s name. You can tell Supercite to ignore the title, while still recognizing hyphenated names through the use of a regular expression in the variable sc-titlecue-regexp. This variable has the default value of "\\\\s +-+\\\\s +". Any text after this regexp is encountered is ignored as noise.

Some ‘From:’ headers may contain extra titles in the name fields not separated by a title cue, but which are nonetheless not part of the author’s name proper. Examples include the titles “Dr.”, “Mr.”, “Ms.”, “Jr.”, “Sr.”, and “III” (e.g., Thurston Howe, the Third). Also, some companies prepend or append the name of the division, organization, or project on the author’s name. All of these titles are noise which should be ignored. The variable sc-name-filter-alist is used for this purpose. As implied by its name, this variable is an association list, where each element is a cons cell of the form:

(regexp . position)

where regexp is a regular expression that is matched (using string-match) against each element of the ‘From:’ field’s author name. position is a position indicator, starting at zero. Thus to strip out all titles of “Dr.”, “Mr.”, etc. from the name, sc-name-filter-alist would have an entry such as:

("^\\(Mr\\|Mrs\\|Ms\\|Dr\\)[.]?$" . 0)

which only removes them if they appear as the first word in the name. The position indicator is an integer, or one of the two special symbols last or any. last always matches against the last word in the name field, while any matches against every word in the name field.

8 Configuring the Citation Engine

At the heart of Supercite is a regular expression interpreting engine called Regi. Regi operates by interpreting a data structure called a Regi-frame (or just frame), which is a list of Regi-entries (or just entry). Each entry contains a predicate, typically a regular expression, which is matched against a line of text in the current buffer. If the predicate matches true, an associated expression is evaluated. In this way, an entire region of text can be transformed in an awk-like manner. Regi is used throughout Supercite, from mail header information extraction, to header nuking, to citing text.

While the details of Regi are discussed below (see Using Regi), only those who wish to customize certain aspects of Supercite need concern themselves with it. It is important to understand though, that any conceivable citation style that can be described by a regular expression can be recognized by Supercite. This leads to some interesting applications. For example, if you regularly receive email from a co-worker that uses an uncommon citation style (say one that employs a ‘|’ or ‘}’ character at the front of the line), it is possible for Supercite to recognize this and coerce the citation to your preferred style, for consistency. In theory, it is possible for Supercite to recognize such things as uuencoded messages or C code and cite or fill those differently from normal text. None of this is currently part of Supercite, but contributions are welcome!

8.1 Using Regi

Regi works by interpreting frames with the function regi-interpret. A frame is a list of arbitrary size where each element is an entry of the following form:

(pred func [negate-p [case-fold-search]])

Regi starts with the first entry in a frame, evaluating the pred of that entry against the beginning of the line that ‘point’ is on. If the pred evaluates to true (or false if the optional negate-p is non-nil), then the func for that entry is evaluated. How processing continues is determined by the return value for func, and is described below. If pred was false the next entry in the frame is checked until all entries have been matched against the current line. If no entry matches, ‘point’ is moved forward one line and the frame is reset to the first entry.

pred can be a string, a variable, a list or one of the following symbols: t, begin, end, or every. If pred is a string, or a variable or list that evaluates to a string, it is interpreted as a regular expression. This regexp is matched against the current line, from the beginning, using looking-at. This match folds case if the optional case-fold-search is non-nil. If pred is not a string, or does not evaluate to a string, it is interpreted as a binary value (nil or non-nil).

The four special symbol values for pred are recognized:

t

Always produces a true outcome.

begin

Always executed before the frame is interpreted. This can be used to initialize some global variables for example.

end

Always executed after frame interpreting is completed. This can be used to perform any necessary post-processing.

every

Executes whenever the frame is reset, usually after the entire frame has been matched against the current line.

Note that negate-p and case-fold-search are ignored if pred is one of these special symbols. Only the first occurrence of each symbol in a frame is used; any duplicates are ignored. Also note that for performance reasons, the entries associated with these symbols are removed from the frame during the main interpreting loop.

Your func can return certain values which control continued Regi processing. By default, if your func returns nil (as it should be careful to do explicitly), Regi will reset the frame to the first entry, and advance ‘point’ to the beginning of the next line. If a list is returned from your function, it can contain any combination of the following elements:

the symbol continue

This tells Regi to continue processing entries after a match, instead of resetting the frame and moving ‘point’. In this way, lines of text can have multiple matches, but you have to be careful to avoid entering infinite loops.

the symbol abort

This tells Regi to terminate frame processing. However, any end entry is still processed.

the list (frame . newframe)

This tells Regi to substitute newframe as the frame it is interpreting. In other words, your func can modify the Regi frame on the fly. newframe can be a variable containing a frame, or it can be the frame in-lined.

the list (step . step)

Tells Regi to move step number of lines forward as it continues processing. By default, Regi moves forward one line. step can be zero or negative of course, but watch out for infinite loops.

During execution of your func, the following variables will be temporarily bound to some useful information:

curline

The current line in the buffer that Regi is looking-at, as a string.

curframe

The current frame being interpreted.

curentry

The current frame entry being interpreted.

8.2 Frames You Can Customize

As mentioned earlier, Supercite uses various frames to perform certain jobs such as mail header information extraction and mail header nuking. However, these frames are not available for you to customize, except through abstract interfaces such as sc-nuke-mail-header, et al.

However, the citation frames Supercite uses provide a lot of customizing power and are thus available to you to change to suit your needs. The workhorse of citation is the frame contained in the variable sc-default-cite-frame. This frame recognizes many situations, such as blank lines, which it interprets as paragraph separators. It also recognizes previously cited nested and non-nested citations in the original message. By default it will coerce non-nested citations into your preferred citation style, and it will add a level of citation to nested citations. It will also simply cite uncited lines in your preferred style.

In a similar vein, there are default frames for unciting and reciting, contained in the variables sc-default-uncite-frame and sc-default-recite-frame respectively.

As mentioned earlier (see Recognizing Citations), citations are recognized through the values of the regular expressions sc-citation-root-regexp, et al. To recognize odd styles, you could modify these variables, or you could modify the default citing frame. Alternatively, you could set up association lists of frames for recognizing specific alternative forms.

For each of the actions—citing, unciting, and reciting—an alist is consulted to find the frame to use (sc-cite-frame-alist, sc-uncite-frame-alist, and sc-recite-frame-alist respectively). These frames can contain alists of the form:

((infokey (regexp . frame) (regexp . frame) …)
 (infokey (regexp . frame) (regexp . frame) …)
 (…))

Where infokey is a key suitable for sc-mail-field, regexp is a regular expression which is string-match’d against the value of the sc-mail-field key, and frame is the frame to use if a match occurred. frame can be a variable containing a frame or a frame in-lined.

When Supercite is about to cite, uncite, or recite a region, it consults the appropriate alist and attempts to find a frame to use. If one is not found from the alist, then the appropriate default frame is used.

9 Post-yank Formatting Commands

Once the original message has been yanked into the reply buffer, and sc-cite-original has had a chance to do its thing, a number of useful Supercite commands will be available to you. Since there is wide variety in the keymaps that MUAs set up in their reply buffers, it is next to impossible for Supercite to properly sprinkle its commands into the existing keymap. For this reason Supercite places its commands on a separate keymap, putting this keymap onto a prefix key in the reply buffer. You can customize the prefix key Supercite uses by changing the variable sc-mode-map-prefix. By default, the sc-mode-map-prefix is C-c C-p; granted, not a great choice, but unfortunately the best general solution so far. In the rest of this chapter, we’ll assume you’ve installed Supercite’s keymap on the default prefix.

9.1 Commands to Manually Cite, Recite, and Uncite

Probably the three most common post-yank formatting operations that you will perform will be the manual citing, reciting, and unciting of regions of text in the reply buffer. Often you may want to recite a paragraph to use a nickname, or manually cite a message when setting sc-cite-region-limit to nil. The following commands perform these functions on the region of text between ‘point’ and ‘mark’. Each of them sets the undo boundary before modifying the region so that the command can be undone in the standard Emacs way.

Here is the list of Supercite citing commands:

sc-cite-region (C-c C-p c)

This command cites each line in the region of text by interpreting the selected frame from sc-cite-frame-alist, or the default citing frame sc-default-cite-frame. It runs the hook sc-pre-cite-hook before interpreting the frame. With an optional universal argument (C-u), it temporarily sets sc-confirm-always-p to t so you can confirm the attribution string for a single manual citing. See Configuring the Citation Engine.

sc-uncite-region (C-c C-p u)

This command removes any citation strings from the beginning of each cited line in the region by interpreting the selected frame from sc-uncite-frame-alist, or the default unciting frame sc-default-uncite-frame. It runs the hook sc-pre-uncite-hook before interpreting the frame. See Configuring the Citation Engine.

sc-recite-region (C-c C-p r)

This command recites each line the region by interpreting the selected frame from sc-recite-frame-alist, or the default reciting frame sc-default-recite-frame. It runs the hook sc-pre-recite-hook before interpreting the frame. See Configuring the Citation Engine.

Supercite will always ask you to confirm the attribution when reciting a region, regardless of the value of sc-confirm-always-p.

9.2 Insertion Commands

These two functions insert various strings into the reply buffer.

sc-insert-reference (C-c C-p w)

Inserts a reference header into the reply buffer at ‘point’. With no arguments, the header indexed by sc-preferred-header-style is inserted. An optional numeric argument is the index into sc-rewrite-header-list indicating which reference header to write.

With just the universal argument (C-u), electric reference mode is entered, regardless of the value of sc-electric-references-p.

sc-insert-citation (C-c C-p i)

Inserts the current citation string at the beginning of the line that ‘point’ is on. If the line is already cited, Supercite will issue an error and will not cite the line.

9.3 Variable Toggling Shortcuts

Supercite defines a number of commands that make it easier for you to toggle and set various Supercite variables as you are editing the reply buffer. For example, you may want to turn off filling or whitespace cleanup, but only temporarily. These toggling shortcut commands make this easy to do.

Like Supercite commands in general, the toggling commands are placed on a keymap prefix within the greater Supercite keymap. For the default value of sc-mode-map-prefix, this will be C-c C-p C-t.

The following commands toggle the value of certain Supercite variables which take only a binary value:

C-c C-p C-t b

Toggles the variable sc-mail-nuke-blank-lines-p.

C-c C-p C-t c

Toggles the variable sc-confirm-always-p.

C-c C-p C-t d

Toggles the variable sc-downcase-p.

C-c C-p C-t e

Toggles the variable sc-electric-references-p.

C-c C-p C-t f

Toggles the variable sc-auto-fill-region-p.

C-c C-p C-t o

Toggles the variable sc-electric-circular-p.

C-c C-p C-t s

Toggles the variable sc-nested-citation-p.

C-c C-p C-t u

Toggles the variable sc-use-only-preferences-p.

C-c C-p C-t w

Toggles the variable sc-fixup-whitespace-p.

The following commands let you set the value of multi-value variables, in the same way that Emacs’s set-variable does:

C-c C-p C-t a

Sets the value of the variable sc-preferred-attribution-list.

C-c C-p C-t l

Sets the value of the variable sc-cite-region-limit.

C-c C-p C-t n

Sets the value of the variable sc-mail-nuke-mail-headers.

C-c C-p C-t N

Sets the value of the variable sc-mail-header-nuke-list.

C-c C-p C-t p

Sets the value of the variable sc-preferred-header-style.

One special command is provided to toggle both sc-auto-fill-region-p and sc-fixup-whitespace-p together. This is because you typically want to run Supercite with either variable as nil or non-nil. The command to toggle these variables together is bound on C-c C-p C-p.

Finally, the command C-c C-p C-t h (also C-c C-p C-t ?) brings up a Help message on the toggling keymap.

9.4 Mail Field Commands

These commands allow you to view, modify, add, and delete various bits of information from the info alist. See Information Keys and the Info Alist.

sc-mail-field-query (C-c C-p f)

Allows you to interactively view, modify, add, and delete info alist key-value pairs. With no argument, you are prompted (with completion) for an info key. The value associated with that key is displayed in the minibuffer. With an argument, this command will first ask if you want to view, modify, add, or delete an info key. Viewing is identical to running the command with no arguments.

If you want to modify the value of a key, Supercite will first prompt you (with completion) for the key of the value you want to change. It will then put you in the minibuffer with the key’s current value so you can edit the value as you wish. When you hit RET, the key’s value is changed. Minibuffer history is kept for the values.

If you choose to delete a key-value pair, Supercite will prompt you (with completion) for the key to delete.

If you choose to add a new key-value pair, Supercite firsts prompts you for the key to add. Note that completion is turned on for this prompt, but you can type any key name here, even one that does not yet exist. After entering the key, Supercite prompts you for the key’s value. It is not an error to enter a key that already exists, but the new value will override any old value. It will not replace it though; if you subsequently delete the key-value pair, the old value will reappear.

sc-mail-process-headers (C-c C-p g)

This command lets you re-initialize Supercite’s info alist from any set of mail headers in the region between ‘point’ and ‘mark’. This function is especially useful for replying to digest messages where Supercite will initially set up its information for the digest originator, but you want to cite each component article with the real message author. Note that unless an error during processing occurs, any old information is lost.

9.5 Miscellaneous Commands

sc-open-line (C-c C-p o)

Similar to Emacs’s standard open-line commands, but inserts the citation string in front of the new line. As with open-line, an optional numeric argument inserts that many new lines.

10 Hints to MUA Authors

In June of 1989, some discussion was held between the various MUA authors, the Supercite author, and other Supercite users. These discussions centered around the need for a standard interface between MUAs and Supercite (or any future Supercite-like packages). This interface was formally proposed by Martin Neitzel on Fri, 23 Jun 89, in a mail message to the Supercite mailing list:

        Martin> Each news/mail-reader should provide a form of
        Martin> mail-yank-original that

        Martin> 1: inserts the original message incl. header into the
        Martin>    reply buffer; no indentation/prefixing is done, the header
        Martin>    tends to be a "full blown" version rather than to be
        Martin>    stripped down.

        Martin> 2: 'point' is at the start of the header, 'mark' at the
        Martin>    end of the message body.

        Martin> 3: (run-hooks 'mail-yank-hooks)

        Martin> [Supercite] should be run as such a hook and merely
        Martin> rewrite the message.  This way it isn't anymore
        Martin> [Supercite]'s job to gather the original from obscure
        Martin> sources. […]

This specification was adopted, but underwent a slight modification with the release of Emacs 19. Instead of the variable mail-yank-hooks, the hook variable that the MUA should provide is mail-citation-hook. Richard Stallman suggests that the MUAs should defvar mail-citation-hook to nil and perform some default citing when that is the case.

If you are writing a new MUA package, or maintaining an existing MUA package, you should make it conform to this interface so that your users will be able to link Supercite easily and seamlessly. To do this, when setting up a reply or forward buffer, your MUA should follow these steps:

  1. Insert the original message, including the mail headers into the reply buffer. At this point you should not modify the raw text in any way (except for any necessary decoding, e.g., of quoted-printable text), and you should place all the original headers into the body of the reply. This means that many of the mail headers will be duplicated, one copy above the mail-header-separator line and one copy below, however there will probably be more headers below this line.
  2. Set ‘point’ to the beginning of the line containing the first mail header in the body of the reply. Set ‘mark’ at the end of the message text. It is very important that the region be set around the text Supercite is to modify and that the mail headers are within this region. Supercite will not venture outside the region for any reason, and anything within the region is fair game, so don’t put anything that must remain unchanged inside the region.
  3. Run the hook mail-citation-hook. You will probably want to provide some kind of default citation functions in cases where the user does not have Supercite installed. By default, your MUA should defvar mail-citation-hook to nil, and in your yanking function, check its value. If it finds mail-citation-hook to be nil, it should perform some default citing behavior. User who want to connect to Supercite then need only add sc-cite-original to this list of hooks using add-hook.

If you do all this your MUA will join the ranks of those that conform to this interface “out of the box.”

11 Thanks and History

The Supercite package was derived from its predecessor Superyank 1.11 which was inspired by various bits of code and ideas from Martin Neitzel and Ashwin Ram. They were the folks who came up with the idea of non-nested citations and implemented some rough code to provide this style. Superyank and Supercite version 2 evolved to the point where much of the attribution selection mechanism was automatic, and features have been continuously added through the comments and suggestions of the Supercite mailing list participants.

With version 3, Supercite underwent an almost complete rewrite, benefiting in a number of ways, including vast improvements in the speed of performance, a big reduction in size of the code and in the use of Emacs resources, and a much cleaner and flexible internal architecture. Most of this work was internal and not of very great importance to the casual user. There were some changes at the user-visible level, but for the most part, the Supercite configuration variables from version 2 should still be relevant to version 3. Hopefully Supercite version 3 is faster, smaller, and much more flexible than its predecessors.

In the version 2 manual I thanked some specific people for their help in developing Supercite 2. You folks know who you are and your continued support is greatly appreciated. I wish to thank everyone on the Supercite mailing list, especially the brave alpha testers, who helped considerably in testing out the concepts and implementation of Supercite version 3. Special thanks go out to the MUA and Emacs authors Kyle Jones, Stephen Gildea, Richard Stallman, and Jamie Zawinski for coming to a quick agreement on the new mail-citation-hook interface, and for adding the magic lisp to their code to support this.

All who have helped and contributed have been greatly appreciated.

Supercite was written by Barry Warsaw.

Appendix A GNU Free Documentation License

Version 1.3, 3 November 2008
Copyright © 2000, 2001, 2002, 2007, 2008 Free Software Foundation, Inc.
https://fsf.org/

Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
  1. PREAMBLE

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    The Document may include Warranty Disclaimers next to the notice which states that this License applies to the Document. These Warranty Disclaimers are considered to be included by reference in this License, but only as regards disclaiming warranties: any other implication that these Warranty Disclaimers may have is void and has no effect on the meaning of this License.

  3. VERBATIM COPYING

    You may copy and distribute the Document in any medium, either commercially or noncommercially, provided that this License, the copyright notices, and the license notice saying this License applies to the Document are reproduced in all copies, and that you add no other conditions whatsoever to those of this License. You may not use technical measures to obstruct or control the reading or further copying of the copies you make or distribute. However, you may accept compensation in exchange for copies. If you distribute a large enough number of copies you must also follow the conditions in section 3.

    You may also lend copies, under the same conditions stated above, and you may publicly display copies.

  4. COPYING IN QUANTITY

    If you publish printed copies (or copies in media that commonly have printed covers) of the Document, numbering more than 100, and the Document’s license notice requires Cover Texts, you must enclose the copies in covers that carry, clearly and legibly, all these Cover Texts: Front-Cover Texts on the front cover, and Back-Cover Texts on the back cover. Both covers must also clearly and legibly identify you as the publisher of these copies. The front cover must present the full title with all words of the title equally prominent and visible. You may add other material on the covers in addition. Copying with changes limited to the covers, as long as they preserve the title of the Document and satisfy these conditions, can be treated as verbatim copying in other respects.

    If the required texts for either cover are too voluminous to fit legibly, you should put the first ones listed (as many as fit reasonably) on the actual cover, and continue the rest onto adjacent pages.

    If you publish or distribute Opaque copies of the Document numbering more than 100, you must either include a machine-readable Transparent copy along with each Opaque copy, or state in or with each Opaque copy a computer-network location from which the general network-using public has access to download using public-standard network protocols a complete Transparent copy of the Document, free of added material. If you use the latter option, you must take reasonably prudent steps, when you begin distribution of Opaque copies in quantity, to ensure that this Transparent copy will remain thus accessible at the stated location until at least one year after the last time you distribute an Opaque copy (directly or through your agents or retailers) of that edition to the public.

    It is requested, but not required, that you contact the authors of the Document well before redistributing any large number of copies, to give them a chance to provide you with an updated version of the Document.

  5. MODIFICATIONS

    You may copy and distribute a Modified Version of the Document under the conditions of sections 2 and 3 above, provided that you release the Modified Version under precisely this License, with the Modified Version filling the role of the Document, thus licensing distribution and modification of the Modified Version to whoever possesses a copy of it. In addition, you must do these things in the Modified Version:

    1. Use in the Title Page (and on the covers, if any) a title distinct from that of the Document, and from those of previous versions (which should, if there were any, be listed in the History section of the Document). You may use the same title as a previous version if the original publisher of that version gives permission.
    2. List on the Title Page, as authors, one or more persons or entities responsible for authorship of the modifications in the Modified Version, together with at least five of the principal authors of the Document (all of its principal authors, if it has fewer than five), unless they release you from this requirement.
    3. State on the Title page the name of the publisher of the Modified Version, as the publisher.
    4. Preserve all the copyright notices of the Document.
    5. Add an appropriate copyright notice for your modifications adjacent to the other copyright notices.
    6. Include, immediately after the copyright notices, a license notice giving the public permission to use the Modified Version under the terms of this License, in the form shown in the Addendum below.
    7. Preserve in that license notice the full lists of Invariant Sections and required Cover Texts given in the Document’s license notice.
    8. Include an unaltered copy of this License.
    9. Preserve the section Entitled “History”, Preserve its Title, and add to it an item stating at least the title, year, new authors, and publisher of the Modified Version as given on the Title Page. If there is no section Entitled “History” in the Document, create one stating the title, year, authors, and publisher of the Document as given on its Title Page, then add an item describing the Modified Version as stated in the previous sentence.
    10. Preserve the network location, if any, given in the Document for public access to a Transparent copy of the Document, and likewise the network locations given in the Document for previous versions it was based on. These may be placed in the “History” section. You may omit a network location for a work that was published at least four years before the Document itself, or if the original publisher of the version it refers to gives permission.
    11. For any section Entitled “Acknowledgements” or “Dedications”, Preserve the Title of the section, and preserve in the section all the substance and tone of each of the contributor acknowledgements and/or dedications given therein.
    12. Preserve all the Invariant Sections of the Document, unaltered in their text and in their titles. Section numbers or the equivalent are not considered part of the section titles.
    13. Delete any section Entitled “Endorsements”. Such a section may not be included in the Modified Version.
    14. Do not retitle any existing section to be Entitled “Endorsements” or to conflict in title with any Invariant Section.
    15. Preserve any Warranty Disclaimers.

    If the Modified Version includes new front-matter sections or appendices that qualify as Secondary Sections and contain no material copied from the Document, you may at your option designate some or all of these sections as invariant. To do this, add their titles to the list of Invariant Sections in the Modified Version’s license notice. These titles must be distinct from any other section titles.

    You may add a section Entitled “Endorsements”, provided it contains nothing but endorsements of your Modified Version by various parties—for example, statements of peer review or that the text has been approved by an organization as the authoritative definition of a standard.

    You may add a passage of up to five words as a Front-Cover Text, and a passage of up to 25 words as a Back-Cover Text, to the end of the list of Cover Texts in the Modified Version. Only one passage of Front-Cover Text and one of Back-Cover Text may be added by (or through arrangements made by) any one entity. If the Document already includes a cover text for the same cover, previously added by you or by arrangement made by the same entity you are acting on behalf of, you may not add another; but you may replace the old one, on explicit permission from the previous publisher that added the old one.

    The author(s) and publisher(s) of the Document do not by this License give permission to use their names for publicity for or to assert or imply endorsement of any Modified Version.

  6. COMBINING DOCUMENTS

    You may combine the Document with other documents released under this License, under the terms defined in section 4 above for modified versions, provided that you include in the combination all of the Invariant Sections of all of the original documents, unmodified, and list them all as Invariant Sections of your combined work in its license notice, and that you preserve all their Warranty Disclaimers.

    The combined work need only contain one copy of this License, and multiple identical Invariant Sections may be replaced with a single copy. If there are multiple Invariant Sections with the same name but different contents, make the title of each such section unique by adding at the end of it, in parentheses, the name of the original author or publisher of that section if known, or else a unique number. Make the same adjustment to the section titles in the list of Invariant Sections in the license notice of the combined work.

    In the combination, you must combine any sections Entitled “History” in the various original documents, forming one section Entitled “History”; likewise combine any sections Entitled “Acknowledgements”, and any sections Entitled “Dedications”. You must delete all sections Entitled “Endorsements.”

  7. COLLECTIONS OF DOCUMENTS

    You may make a collection consisting of the Document and other documents released under this License, and replace the individual copies of this License in the various documents with a single copy that is included in the collection, provided that you follow the rules of this License for verbatim copying of each of the documents in all other respects.

    You may extract a single document from such a collection, and distribute it individually under this License, provided you insert a copy of this License into the extracted document, and follow this License in all other respects regarding verbatim copying of that document.

  8. AGGREGATION WITH INDEPENDENT WORKS

    A compilation of the Document or its derivatives with other separate and independent documents or works, in or on a volume of a storage or distribution medium, is called an “aggregate” if the copyright resulting from the compilation is not used to limit the legal rights of the compilation’s users beyond what the individual works permit. When the Document is included in an aggregate, this License does not apply to the other works in the aggregate which are not themselves derivative works of the Document.

    If the Cover Text requirement of section 3 is applicable to these copies of the Document, then if the Document is less than one half of the entire aggregate, the Document’s Cover Texts may be placed on covers that bracket the Document within the aggregate, or the electronic equivalent of covers if the Document is in electronic form. Otherwise they must appear on printed covers that bracket the whole aggregate.

  9. TRANSLATION

    Translation is considered a kind of modification, so you may distribute translations of the Document under the terms of section 4. Replacing Invariant Sections with translations requires special permission from their copyright holders, but you may include translations of some or all Invariant Sections in addition to the original versions of these Invariant Sections. You may include a translation of this License, and all the license notices in the Document, and any Warranty Disclaimers, provided that you also include the original English version of this License and the original versions of those notices and disclaimers. In case of a disagreement between the translation and the original version of this License or a notice or disclaimer, the original version will prevail.

    If a section in the Document is Entitled “Acknowledgements”, “Dedications”, or “History”, the requirement (section 4) to Preserve its Title (section 1) will typically require changing the actual title.

  10. TERMINATION

    You may not copy, modify, sublicense, or distribute the Document except as expressly provided under this License. Any attempt otherwise to copy, modify, sublicense, or distribute it is void, and will automatically terminate your rights under this License.

    However, if you cease all violation of this License, then your license from a particular copyright holder is reinstated (a) provisionally, unless and until the copyright holder explicitly and finally terminates your license, and (b) permanently, if the copyright holder fails to notify you of the violation by some reasonable means prior to 60 days after the cessation.

    Moreover, your license from a particular copyright holder is reinstated permanently if the copyright holder notifies you of the violation by some reasonable means, this is the first time you have received notice of violation of this License (for any work) from that copyright holder, and you cure the violation prior to 30 days after your receipt of the notice.

    Termination of your rights under this section does not terminate the licenses of parties who have received copies or rights from you under this License. If your rights have been terminated and not permanently reinstated, receipt of a copy of some or all of the same material does not give you any rights to use it.

  11. FUTURE REVISIONS OF THIS LICENSE

    The Free Software Foundation may publish new, revised versions of the GNU Free Documentation License from time to time. Such new versions will be similar in spirit to the present version, but may differ in detail to address new problems or concerns. See https://www.gnu.org/licenses/.

    Each version of the License is given a distinguishing version number. If the Document specifies that a particular numbered version of this License “or any later version” applies to it, you have the option of following the terms and conditions either of that specified version or of any later version that has been published (not as a draft) by the Free Software Foundation. If the Document does not specify a version number of this License, you may choose any version ever published (not as a draft) by the Free Software Foundation. If the Document specifies that a proxy can decide which future versions of this License can be used, that proxy’s public statement of acceptance of a version permanently authorizes you to choose that version for the Document.

  12. RELICENSING

    “Massive Multiauthor Collaboration Site” (or “MMC Site”) means any World Wide Web server that publishes copyrightable works and also provides prominent facilities for anybody to edit those works. A public wiki that anybody can edit is an example of such a server. A “Massive Multiauthor Collaboration” (or “MMC”) contained in the site means any set of copyrightable works thus published on the MMC site.

    “CC-BY-SA” means the Creative Commons Attribution-Share Alike 3.0 license published by Creative Commons Corporation, a not-for-profit corporation with a principal place of business in San Francisco, California, as well as future copyleft versions of that license published by that same organization.

    “Incorporate” means to publish or republish a Document, in whole or in part, as part of another Document.

    An MMC is “eligible for relicensing” if it is licensed under this License, and if all works that were first published under this License somewhere other than this MMC, and subsequently incorporated in whole or in part into the MMC, (1) had no cover texts or invariant sections, and (2) were thus incorporated prior to November 1, 2008.

    The operator of an MMC Site may republish an MMC contained in the site under CC-BY-SA on the same site at any time before August 1, 2009, provided the MMC is eligible for relicensing.

ADDENDUM: How to use this License for your documents

To use this License in a document you have written, include a copy of the License in the document and put the following copyright and license notices just after the title page:

  Copyright (C)  year  your name.
  Permission is granted to copy, distribute and/or modify this document
  under the terms of the GNU Free Documentation License, Version 1.3
  or any later version published by the Free Software Foundation;
  with no Invariant Sections, no Front-Cover Texts, and no Back-Cover
  Texts.  A copy of the license is included in the section entitled ``GNU
  Free Documentation License''.

If you have Invariant Sections, Front-Cover Texts and Back-Cover Texts, replace the “with…Texts.” line with this:

    with the Invariant Sections being list their titles, with
    the Front-Cover Texts being list, and with the Back-Cover Texts
    being list.

If you have Invariant Sections without Cover Texts, or some other combination of the three, merge those two alternatives to suit the situation.

If your document contains nontrivial examples of program code, we recommend releasing these examples in parallel under your choice of free software license, such as the GNU General Public License, to permit their use in free software.

Concept Index

Jump to:   .  
A   C   E   F   G   H   I   K   L   M   N   P   R   S   T   U   Y  
Index Entry  Section

.
.emacs file: Getting Connected
.emacs file: Getting Connected

A
attribute, attributing: Usage Overview
attribution info field (sc-): Information Keys and the Info Alist
attribution list: Selecting an Attribution
attribution string: Citation Elements
author info field (sc-): Information Keys and the Info Alist
author names: Author Names
autoload: Getting Connected

C
citation: Citations
citation delimiter: Citation Elements
citation info field (sc-): Information Keys and the Info Alist
citation interface specification: Getting Connected
citation leader: Citation Elements
citation separator: Citation Elements
citation string: Citation Elements
cite, citing: Usage Overview

E
electric references: Electric References
emailname info field (sc-): Information Keys and the Info Alist
entries (Regi): Configuring the Citation Engine

F
filladapt: What Supercite Does
filladapt: Filling Cited Text
filling paragraphs: Filling Cited Text
firstname info field (sc-): Information Keys and the Info Alist
frames (Regi): Configuring the Citation Engine
from-address info field (sc-): Information Keys and the Info Alist

G
gin-mode: What Supercite Does
gin-mode: Filling Cited Text

H
header rewrite functions: Reference Headers
header rewrite functions, built-in: The Built-in Header Rewrite Functions

I
info alist: What Supercite Does
Info Alist: Information Keys and the Info Alist
information extracted from mail fields: Information Keys and the Info Alist
information keys: Information Keys and the Info Alist
initials info field (sc-): Information Keys and the Info Alist

K
keymap prefix: Reply Buffer Initialization

L
lastname info field (sc-): Information Keys and the Info Alist

M
mark: Getting Connected
middlename-1 info field (sc-): Information Keys and the Info Alist
modeline: What Supercite Does
modeline: Reply Buffer Initialization
MUA: Introduction

N
nested citations: Citations
non-nested citations: Citations
NUA: Introduction
nuking mail headers: What Supercite Does

P
point: Getting Connected

R
reciting: Frames You Can Customize
reference header: What Supercite Does
reference headers: Reference Headers
Regi: Configuring the Citation Engine
reply-address info field (sc-): Information Keys and the Info Alist

S
sc-attribution info field: Information Keys and the Info Alist
sc-author info field: Information Keys and the Info Alist
sc-citation info field: Information Keys and the Info Alist
sc-emailname info field: Information Keys and the Info Alist
sc-firstname info field: Information Keys and the Info Alist
sc-from-address info field: Information Keys and the Info Alist
sc-initials info field: Information Keys and the Info Alist
sc-lastname info field: Information Keys and the Info Alist
sc-middlename-1 info field: Information Keys and the Info Alist
sc-reply-address info field: Information Keys and the Info Alist
sc-sender-address info field: Information Keys and the Info Alist
sender-address info field (sc-): Information Keys and the Info Alist
sendmail.el: Hints to MUA Authors

T
toggling variables: Variable Toggling Shortcuts

U
unciting: Frames You Can Customize
undo boundary: Reply Buffer Initialization

Y
yank: Usage Overview

Jump to:   .  
A   C   E   F   G   H   I   K   L   M   N   P   R   S   T   U   Y  

Next: , Previous: , Up: Supercite   [Contents][Index]

Command Index

Since all supercite commands are prepended with the string “sc-”, each appears under its sc-command name and its command name.

Jump to:   C   D   E   F   H   I   L   M   N   O   R   S   U  
Index Entry  Section

C
cite-original (sc-): Getting Connected
cite-original (sc-): Reply Buffer Initialization
cite-region (sc-): Citing Commands

D
defvar: Hints to MUA Authors

E
eref-abort (sc-): Electric References
eref-exit (sc-): Electric References
eref-goto (sc-): Electric References
eref-jump (sc-): Electric References
eref-next (sc-): Electric References
eref-prev (sc-): Electric References
eref-setn (sc-): Electric References
eval: Using Regi

F
fill-paragraph: What Supercite Does

H
header-attributed-writes (sc-): The Built-in Header Rewrite Functions
header-author-writes (sc-): The Built-in Header Rewrite Functions
header-inarticle-writes (sc-): The Built-in Header Rewrite Functions
header-on-said (sc-): The Built-in Header Rewrite Functions
header-regarding-adds (sc-): The Built-in Header Rewrite Functions
header-verbose (sc-): The Built-in Header Rewrite Functions

I
insert-citation (sc-): Insertion Commands
insert-reference (sc-): Insertion Commands

L
looking-at: Using Regi

M
mail-field (sc-): Information Keys and the Info Alist
mail-field (sc-): Attribution Preferences
mail-field-query (sc-): Mail Field Commands
mail-process-headers (sc-): Mail Field Commands
mail-yank-original: Hints to MUA Authors

N
no-blank-line-or-header (sc-): The Built-in Header Rewrite Functions
no-header (sc-): The Built-in Header Rewrite Functions

O
open-line: Miscellaneous Commands
open-line (sc-): Miscellaneous Commands

R
recite-region (sc-): Citing Commands
regi-interpret: Using Regi

S
sc-cite-original: What Supercite Does
sc-cite-original: Getting Connected
sc-cite-original: Reply Buffer Initialization
sc-cite-region: Citing Commands
sc-eref-abort: Electric References
sc-eref-exit: Electric References
sc-eref-goto: Electric References
sc-eref-jump: Electric References
sc-eref-next: Electric References
sc-eref-prev: Electric References
sc-eref-setn: Electric References
sc-header-attributed-writes: The Built-in Header Rewrite Functions
sc-header-author-writes: The Built-in Header Rewrite Functions
sc-header-inarticle-writes: The Built-in Header Rewrite Functions
sc-header-on-said: The Built-in Header Rewrite Functions
sc-header-regarding-adds: The Built-in Header Rewrite Functions
sc-header-verbose: The Built-in Header Rewrite Functions
sc-insert-citation: Insertion Commands
sc-insert-reference: Insertion Commands
sc-mail-field: Information Keys and the Info Alist
sc-mail-field: Attribution Preferences
sc-mail-field-query: Mail Field Commands
sc-mail-process-headers: Mail Field Commands
sc-no-blank-line-or-header: The Built-in Header Rewrite Functions
sc-no-header: The Built-in Header Rewrite Functions
sc-open-line: Miscellaneous Commands
sc-recite-region: Citing Commands
sc-setup-filladapt: Filling Cited Text
sc-uncite-region: Citing Commands
set-variable: Variable Toggling Shortcuts
setup-filladapt (sc-): Filling Cited Text
string-match: Frames You Can Customize

U
uncite-region (sc-): Citing Commands

Jump to:   C   D   E   F   H   I   L   M   N   O   R   S   U  

Next: , Previous: , Up: Supercite   [Contents][Index]

Key Index

Jump to:   C   F   G   J   N   P   Q   R   S   X  
Index Entry  Section

C
C-c C-p: Reply Buffer Initialization
C-c C-p: Post-yank Formatting Commands
C-c C-p c: Citing Commands
C-c C-p C-p: Filling Cited Text
C-c C-p C-p: Variable Toggling Shortcuts
C-c C-p C-t: Variable Toggling Shortcuts
C-c C-p f: Mail Field Commands
C-c C-p f: Mail Field Commands
C-c C-p g: Mail Field Commands
C-c C-p i: Insertion Commands
C-c C-p o: Miscellaneous Commands
C-c C-p r: Citing Commands
C-c C-p u: Citing Commands
C-c C-p w: Insertion Commands
C-c C-y: Usage Overview
C-j: Electric References
C-u: Citing Commands

F
f: Usage Overview

G
g: Electric References

J
j: Electric References

N
n: Electric References

P
p: Electric References

Q
q: Electric References

R
r: Usage Overview
RET: Electric References

S
s: Electric References

X
x: Electric References

Jump to:   C   F   G   J   N   P   Q   R   S   X  

Previous: , Up: Supercite   [Contents][Index]

Variable Index

Since all supercite variables are prepended with the string “sc-”, each appears under its sc-variable name and its variable name.

Jump to:   A   B   C   D   E   F   M   N   P   R   S   T   U  
Index Entry  Section

A
attrib-selection-list (sc-): Attribution Preferences
attrib-selection-list (sc-): Attribution Preferences
attribs-postselect-hook (sc-): Anonymous Attributions
attribs-preselect-hook (sc-): Anonymous Attributions
auto-fill-region-p (sc-): Filling Cited Text

B
blank-lines-after-headers (sc-): Reply Buffer Initialization

C
citation-delimiter (sc-): Citation Elements
citation-delimiter-regexp (sc-): Recognizing Citations
citation-leader (sc-): Citation Elements
citation-leader-regexp (sc-): Recognizing Citations
citation-nonnested-root-regexp (sc-): Recognizing Citations
citation-root-regexp (sc-): Recognizing Citations
citation-separator (sc-): Citation Elements
citation-separator-regexp (sc-): Recognizing Citations
cite-blank-lines-p (sc-): Reply Buffer Initialization
cite-region-limit (sc-): Reply Buffer Initialization
confirm-always-p: Citing Commands
confirm-always-p (sc-): Reply Buffer Initialization
confirm-always-p (sc-): Anonymous Attributions
confirm-always-p (sc-): Citing Commands

D
default-attribution (sc-): Anonymous Attributions
default-author-name (sc-): Anonymous Attributions
downcase-p (sc-): Anonymous Attributions

E
electric-circular-p (sc-): Electric References
electric-mode-hook (sc-): Electric References
electric-references-p (sc-): Electric References

F
fill-prefix: What Supercite Does
fill-prefix: Filling Cited Text
fixup-whitespace-p (sc-): Filling Cited Text

M
mail-citation-hook: Getting Connected
mail-citation-hook: Hints to MUA Authors
mail-header-separator: What Supercite Does Not Do
mail-warn-if-non-rfc822-p (sc-): Reply Buffer Initialization
mail-yank-hooks: Hints to MUA Authors
mode-map-prefix (sc-): Reply Buffer Initialization
mode-map-prefix (sc-): Post-yank Formatting Commands
mumble (sc-): Information Keys and the Info Alist

N
name-filter-alist (sc-): Author Names
nested-citation-p (sc-): Citations
nuke-mail-header-list (sc-): Reply Buffer Initialization
nuke-mail-headers (sc-): Reply Buffer Initialization

P
post-hook (sc-): Reply Buffer Initialization
pre-cite-hook (sc-): Citing Commands
pre-hook (sc-): Reply Buffer Initialization
preferred-attribution-list (sc-): Selecting an Attribution
preferred-header-style (sc-): Reference Headers
preferred-header-style (sc-): Insertion Commands

R
reference-tag-string (sc-): The Built-in Header Rewrite Functions
rewrite-header-list (sc-): Reference Headers

S
sc-attrib-selection-list: Attribution Preferences
sc-attrib-selection-list: Attribution Preferences
sc-attribs-postselect-hook: Anonymous Attributions
sc-attribs-preselect-hook: Anonymous Attributions
sc-auto-fill-region-p: Filling Cited Text
sc-blank-lines-after-headers: Reply Buffer Initialization
sc-citation-delimiter: Citation Elements
sc-citation-delimiter-regexp: Recognizing Citations
sc-citation-leader: Citation Elements
sc-citation-leader-regexp: Recognizing Citations
sc-citation-nonnested-root-regexp: Recognizing Citations
sc-citation-root-regexp: Recognizing Citations
sc-citation-separator: Citation Elements
sc-citation-separator-regexp: Recognizing Citations
sc-cite-blank-lines-p: Reply Buffer Initialization
sc-cite-frame-alist: Frames You Can Customize
sc-cite-region-limit: Reply Buffer Initialization
sc-cite-region-limit: Citing Commands
sc-confirm-always-p: Reply Buffer Initialization
sc-confirm-always-p: Anonymous Attributions
sc-confirm-always-p: Citing Commands
sc-confirm-always-p: Citing Commands
sc-default-attribution: Anonymous Attributions
sc-default-author-name: Anonymous Attributions
sc-default-cite-frame: Frames You Can Customize
sc-default-recite-frame: Frames You Can Customize
sc-default-uncite-frame: Frames You Can Customize
sc-downcase-p: Anonymous Attributions
sc-electric-circular-p: Electric References
sc-electric-mode-hook: Electric References
sc-electric-references-p: Electric References
sc-fixup-whitespace-p: Filling Cited Text
sc-mail-field: Frames You Can Customize
sc-mail-warn-if-non-rfc822-p: Reply Buffer Initialization
sc-mode-map-prefix: Reply Buffer Initialization
sc-mode-map-prefix: Post-yank Formatting Commands
sc-mumble: Information Keys and the Info Alist
sc-name-filter-alist: Author Names
sc-nested-citation-p: Citations
sc-nuke-mail-header: Frames You Can Customize
sc-nuke-mail-header-list: Reply Buffer Initialization
sc-nuke-mail-headers: Reply Buffer Initialization
sc-post-hook: Reply Buffer Initialization
sc-pre-cite-hook: Citing Commands
sc-pre-hook: Reply Buffer Initialization
sc-preferred-attribution-list: Selecting an Attribution
sc-preferred-header-style: Reference Headers
sc-preferred-header-style: Insertion Commands
sc-recite-frame-alist: Frames You Can Customize
sc-reference-tag-string: The Built-in Header Rewrite Functions
sc-rewrite-header-list: Reference Headers
sc-titlecue-regexp: Author Names
sc-uncite-frame-alist: Frames You Can Customize
sc-use-only-preference-p: Anonymous Attributions

T
titlecue-regexp (sc-): Author Names

U
use-only-preference-p (sc-): Anonymous Attributions

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