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=head1 NAME

Automake::ChannelDefs - channel definitions for Automake and helper functions

=head1 SYNOPSIS

  use Automake::ChannelDefs;

  Automake::ChannelDefs::usage ();
  prog_error ($MESSAGE, [%OPTIONS]);
  error ($WHERE, $MESSAGE, [%OPTIONS]);
  error ($MESSAGE);
  fatal ($WHERE, $MESSAGE, [%OPTIONS]);
  fatal ($MESSAGE);
  verb ($MESSAGE, [%OPTIONS]);
  switch_warning ($CATEGORY);
  parse_WARNINGS ();
  parse_warnings ($OPTION, $ARGUMENT);
  Automake::ChannelDefs::set_strictness ($STRICTNESS_NAME);

=head1 DESCRIPTION

This packages defines channels that can be used in Automake to
output diagnostics and other messages (via C<msg()>).  It also defines
some helper function to enable or disable these channels, and some
shorthand function to output on specific channels.

=cut

=head2 CHANNELS

The following channels can be used as the first argument of
C<Automake::Channel::msg>.  For some of them we list a shorthand
function that makes the code more readable.

=over 4

=item C<fatal>

Fatal errors.  Use C<&fatal> to send messages over this channel.

=item C<error>

Common errors.  Use C<&error> to send messages over this channel.

=item C<error-gnu>

Errors related to GNU Standards.

=item C<error-gnu/warn>

Errors related to GNU Standards that should be warnings in `foreign' mode.

=item C<error-gnits>

Errors related to GNITS Standards (silent by default).

=item C<automake>

Internal errors.  Use C<&prog_error> to send messages over this channel.

=item C<gnu>

Warnings related to GNU Coding Standards.

=item C<obsolete>

Warnings about obsolete features (silent by default).

=item C<override>

Warnings about user redefinitions of Automake rules or
variables (silent by default).

=item C<portability>

Warnings about non-portable constructs.

=item C<syntax>

Warnings about weird syntax, unused variables, typos...

=item C<unsupported>

Warnings about unsupported (or mis-supported) features.

=item C<verb>

Messages output in C<--verbose> mode.  Use C<&verb> to send such messages.

=item C<note>

Informative messages.

=back

=cut

=head2 FUNCTIONS

=over 4

=item C<usage ()>

Display warning categories.

=cut

=item C<prog_error ($MESSAGE, [%OPTIONS])>

Signal a programming error (on channel C<automake>),
display C<$MESSAGE>, and exit 1.

=cut

=item C<error ($WHERE, $MESSAGE, [%OPTIONS])>

=item C<error ($MESSAGE)>

Uncategorized errors.

=cut

=item C<fatal ($WHERE, $MESSAGE, [%OPTIONS])>

=item C<fatal ($MESSAGE)>

Fatal errors.

=cut

=item C<verb ($MESSAGE, [%OPTIONS])>

C<--verbose> messages.

=cut

=item C<switch_warning ($CATEGORY, $WHERE)>

If C<$CATEGORY> is C<mumble>, turn on channel C<mumble>.
If it's C<no-mumble>, turn C<mumble> off.
Else handle C<all> and C<none> for completeness.
The warnings has been set at location C<$WHERE>.

=cut

=item C<parse_WARNINGS ()>

Parse the WARNINGS environment variable.

=cut

=item C<parse_warnings ($OPTION, $ARGUMENT)>

Parse the argument of C<--warning=CATEGORY> or C<-WCATEGORY>.

C<$OPTIONS> is C<"--warning"> or C<"-W">, C<$ARGUMENT> is C<CATEGORY>.

This is meant to be used as an argument to C<Getopt>.

=cut

=item C<set_strictness ($STRICTNESS_NAME)>

Configure channels for strictness C<$STRICTNESS_NAME>.

=cut

=head1 SEE ALSO

L<Automake::Channels>

=head1 HISTORY

Written by Alexandre Duret-Lutz E<lt>F<adl@gnu.org>E<gt>.

=cut