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|
eval '(exit $?0)' && eval 'exec perl -wS "$0" "$@"'
& eval 'exec perl -wS "$0" $argv:q'
if 0;
# This file is part of GNU Mailutils.
# Copyright (C) 2017 Free Software Foundation, Inc.
#
# GNU Mailutils is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 3, or (at
# your option) any later version.
#
# GNU Mailutils is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GNU Mailutils. If not, see <http://www.gnu.org/licenses/>.
use strict;
use Getopt::Long qw(:config gnu_getopt no_ignore_case);
use Pod::Usage;
use Pod::Man;
use Pod::Find qw(pod_where);
=head1 NAME
gitinfo.pl - build version tag for mailutils
=head1 SYNOPSIS
B<perl gitinfo.pl>
[B<-C> I<DIR>]
[B<-H> I<FORMAT>]
[B<-o> I<FILE>]
[B<-r> B<recent> | B<released> | B<stable>]
[B<--directory=>I<DIR>]
[B<--format=>I<FORMAT>]
[B<--output=>I<FILE>]
[B<--reference=>B<recent> | B<released> | B<stable>]
B<perl gitinfo.pl> B<-h> | B<--help> | B<--usage>
=head1 DESCRIPTION
Outputs Git information for the version of GNU mailutils in
the local source tree. The information is printed according to
the supplied I<FORMAT>. The format is an arbitrary string, containing
variable references in the form B<$I<VARIABLE>> or B<${I<VARIABLE>}>.
If the variable reference occurs within a quoted string, any occurrences
of double quotes and backslashes in the expansion will be escaped by
backslashes.
The following variables are defined:
=over 4
=item B<package_name>
Package name, obtained from the B<AC_INIT> line in F<configure.ac>.
=item B<package_version>
Package version, from the same source.
=item B<recent_version>
Most recent version as listed in the B<NEWS> file.
=item B<recent_date>
Date when the most recent version was released (if it was).
=item B<recent_commit>
Hash of the commit corresponding to the resent version.
=item B<recent_distance>
Distance (number of commits) between B<recent_commit> and B<HEAD>.
=item B<released_version>
The most recent released version as per B<NEWS> file.
=item B<released_date>
Date when it was released.
=item B<released_commit>
Hash of the commit corresponding to B<released_version>.
=item B<released_distance>
Distance (number of commits) between B<released_commit> and B<HEAD>.
=item B<stable_version>
The most recent stable version, i.e. most recently released version
which number doesn't have patchlevel part. Most often is the same
as B<released_version>.
=item B<stable_date>
Date of the stable release.
=item B<stable_commit>
Hash of the commit corresponding to B<stable_version>.
=item B<stable_distance>
Distance between B<stable_commit> and B<HEAD>.
=item B<refversion>
Reference version, selected by the B<--reference> command line option.
By default, it is the same as B<recent_version> above.
=item B<refdate>
Date when B<refversion> was released. May be absent, if the reference
version was never released.
=item B<refcommit>
Hash of the commit corresponding to the B<refversion>.
=item B<refdist>
Number of commits between B<refcommit> and B<HEAD>.
=item B<describe>
Result of the B<git describe> command.
=item B<dirty>
If the source tree has uncommitted modifications, this variable is set
to 1. Otherwise, it is undefined.
=item B<commit_hash>
The hash of the topmost commit.
=item B<commit_time>
Time of the topmost commit (UNIX timestamp).
=item B<commit_subject>
Subject of the topmost commit.
=back
The construct
B<{?I<EXPR>??I<REPL-IF-TRUE>>[B<?|I<REPL-IF-FALSE>>]B<?}>
within a format string provides a rudimental control flow facility. The
I<EXPR> is evaluated as a Perl expression in an environment when the variales
disucussed above are defined. If the result is true (in Perl sense), the
construct expands to I<REPL-IF-TRUE>. Othervise, it expands to
I<REPL-IF-FALSE> or, if it is not defined, to the empty string.
Notice, that conditional expressions cannot be nested.
In addition to the format strings, the argument to the B<--format> option
can be any of the following predefined format names:
=over 4
=item B<h>
=item B<c>
Produces a set of B<C> defines. It is equivalent to the following multi-line
format:
#define MU_GIT_COMMIT_HASH "$commit_hash"
#define MU_GIT_COMMIT_TIME "$commit_time"
#define MU_GIT_COMMIT_SUBJECT "$commit_subject"
{?$refdist>0??#define MU_GIT_COMMIT_DISTANCE $refdist
?}#define MU_GIT_DESCRIBE_STRING "$describe{?$dirty??-dirty?}"
=item B<all>
This is the default format. It outputs all variables as B<I<NAME>="I<VALUE>">
pairs, each pair on a separate line. Occurrences of B<"> and B<\> within
values are escaped by additional backslashes.
=back
=head1 OPTIONS
=over 4
=item B<-C>, B<--directory=>I<DIR>
Use I<DIR> as the top-level source directory. By default it is determined
automatically, which works for as long as B<gitinfo.pl> is run from a
subdirectory of the git-controlled working tree.
=item B<-H>, B<--format>=I<FORMAT>
Select output format. See B<DESCRIPTION> for the details.
=item B<-o>, B<--output=>I<FILE>
Output results to the I<FILE>, instead of the standard output.
=item B<-r>, B<--reference=>I<VERSION>
Select the reference version. Argument is one of: B<recent> (the default),
B<released>, or B<stable>.
=item B<-h>
Display short help summary.
=item B<--help>
Display the manpage.
=item B<--usage>
Display command line usage summary.
=back
=cut
# find_commit(VERSION)
# Finds commit corresponding to the version number VERSION.
sub find_commit($) {
my $v = quotemeta(shift);
my $cmd = q{git log -S'^AC_INIT\(\[[^]]+\][[:space:]]*,[[:space:]]*\[}
. $v
. q{\]' --pickaxe-regex --reverse --pretty=format:%H -- configure.ac};
open(my $fd, '-|', $cmd)
or die "$cmd: $!";
my $s = <$fd>;
close $fd;
chomp $s;
return $s;
}
# find_count(VERSION)
# Returns number of commits between VERSION and the current commit.
sub find_count($) {
my $v = shift;
my $cmd = "git rev-list --count $v..HEAD";
open(my $fd, '-|', $cmd) or die "$cmd: $!";
my $s = <$fd>;
close $fd;
chomp $s;
return $s;
}
sub scan_news($) {
my ($hashref) = @_;
my $file = 'NEWS';
open(my $fd, '<', $file) or die "can't open $file: $!";
while (<$fd>) {
chomp;
if (/^(?:\*[[:space:]]+)?
[vV]ersion [[:space:]]+
([[:digit:]](?:[.,][[:digit:]]+){1,2}(?:[[:digit:]._-])*)
(?:(?:.*)[[:punct:]][[:space:]]*
([[:digit:]]{4}-[[:digit:]]{2}-[[:digit:]]{2}))?/x) {
my ($ver, $date) = ($1, $2);
unless (exists($hashref->{recent_version})) {
$hashref->{recent_version} = $ver;
$hashref->{recent_date} = $date if $date;
}
if ($date) {
if (!exists($hashref->{released_version})) {
$hashref->{released_version} = $ver;
$hashref->{released_date} = $date;
}
if ($ver =~ /^\d+\.\d+$/) {
$hashref->{stable_version} = $ver;
$hashref->{stable_date} = $date;
last;
}
}
}
}
close $fd;
}
# this_version()
# Returns a list (package, version).
sub this_version() {
my $file = 'configure.ac';
open(my $fd, '<', $file) or die "can't open $file: $!";
while (<$fd>) {
chomp;
return ($1, $2) if (/^AC_INIT\(\[(.+?)\]\s*,\s*\[(.+?)\].*/);
}
}
# git_describe($HASHREF)
# Define 'describe' and 'dirty' keys in $HASHREF
sub git_describe($) {
my ($href) = @_;
my $descr = `git describe`;
chomp $descr;
$href->{describe} = $descr;
if (`git diff-index --name-only HEAD 2>/dev/null`) {
$href->{dirty} = 1;
}
return $descr;
}
# last_commit_info($HASHREF)
# Populates %$HASHREF with entries describing the current commit.
sub last_commit_info {
my ($hashref) = @_;
my @names = qw(commit_hash commit_time commit_subject);
open(my $fd,'-|',
"git log --max-count=1 --pretty=format:'%H%n%ai%n%s' HEAD")
or die;
while (<$fd>) {
chomp;
my $name = shift @names;
last unless $name;
$hashref->{$name} = $_;
}
close $fd;
}
# Convert POD markup to the usage message suitable for --help and --usage
# output.
sub pod_usage_msg() {
my %args;
open my $fd, '>', \my $msg;
$args{-input} = pod_where({-inc => 1}, __PACKAGE__);
pod2usage(-verbose => 99,
-sections => 'NAME',
-output => $fd,
-exitval => 'NOEXIT',
%args);
my @a = split /\n/, $msg;
$msg = $a[1];
$msg =~ s/^\s+//;
$msg =~ s/ - /: /;
return $msg;
}
my %gitinfo;
sub eval_format {
my ($format) = @_;
my @res;
while ($format) {
if ($format =~ /^(?<pfx>.*?)"(?<sfx>.*)$/s) {
push @res, eval_format($+{pfx});
my $acc;
$format = $+{sfx};
my $s = $format;
while ($s) {
if ($s =~ /^([^\\"]*?)\\"(.*)$/s) {
$acc .= $1 . '"';
$s = $2;
} elsif ($s =~ /^(.*?)"(.*)$/s) {
$acc .= $1;
$format = $2;
last;
} else {
$acc = undef;
last;
}
}
if (defined($acc)) {
my $x = eval_format($acc);
$x =~ s/(["\\])/\\$1/g;
push @res, '"', $x, '"';
}
} elsif ($format =~ /^(?<pfx>.*?)
\{\?
(?<cond>.+?)
\?\?
(?<iftrue>.+?)
(?:\?\|(?<iffalse>.*?))?
\?\}(?<sfx>.*)$/sx) {
my ($pfx, $cond, $iftrue, $iffalse, $sfx) =
($+{pfx}, $+{cond}, $+{iftrue}, $+{iffalse}, $+{sfx});
use Safe;
my $s = new Safe;
while (my ($k,$v) = each %gitinfo) {
${$s->varglob($k)} = $v;
}
my $x = $s->reval($cond);
push @res, eval_format($pfx);
if ($x) {
push @res, eval_format($iftrue);
} else {
push @res, eval_format($iffalse);
}
$format = $sfx;
} elsif ($format =~ /^(?<pfx>.*?)
\$(?<ocb>{?)
(?<var>[a-zA-Z_][a-zA-Z_0-9]*)
(?<ccb>}?)
(?<sfx>.*)$/sx) {
my ($pfx, $ocb, $var, $ccb, $sfx) =
($+{pfx}, $+{ocb}, $+{var}, $+{ccb}, $+{sfx});
if ("$ocb$ccb" =~ /^(?:{})?$/) {
push @res, $pfx;
my $val = $gitinfo{$var} if defined $gitinfo{$var};
#$val =~ s/(["\\])/\\$1/g if $odq;
push @res, $val;
$format = $sfx;
} else {
last;
}
} else {
last;
}
}
push @res, $format if $format;
return join('', @res);
}
my $refpoint = 'recent';
my $output;
my $format = 'all';
my %fmtab = (
c => <<'EOT'
#define MU_GIT_COMMIT_HASH "$commit_hash"
#define MU_GIT_COMMIT_TIME "$commit_time"
#define MU_GIT_COMMIT_SUBJECT "$commit_subject"
{?$refdist>0??#define MU_GIT_COMMIT_DISTANCE $refdist
?}#define MU_GIT_DESCRIBE_STRING "$describe{?$dirty??-dirty?}"
EOT
,
'h' => 'c',
'all' => sub {
foreach my $name (sort keys %gitinfo) {
my $val = $gitinfo{$name};
next unless defined $val;
$val =~ s/(["\\])/\\$1/g;
print "$name=\"$val\"\n";
}
}
);
my $dir;
GetOptions("help" => sub {
pod2usage(-exitstatus => 0, -verbose => 2);
},
"h" => sub {
pod2usage(-message => pod_usage_msg(),
-exitstatus => 0);
},
"usage" => sub {
pod2usage(-exitstatus => 0, -verbose => 0);
},
"directory|C=s" => \$dir,
"reference|r=s" => \$refpoint,
"format|H=s" => \$format,
"output|o=s" => \$output
) or exit(1);
if ($output) {
open(STDOUT, '>', $output) or die "can't open $output: $!"
}
if ($dir) {
chdir($dir) or die "can't change to $dir: $!";
} elsif (! -d '.git') {
$dir = `git rev-parse --show-toplevel 2>/dev/null`;
chomp $dir;
chdir($dir) or die "can't change to $dir: $!";
}
if (-d '.git') {
scan_news(\%gitinfo);
foreach my $pfx (qw(ref recent_ stable_ released_)) {
my $name = $pfx . 'version';
if (exists($gitinfo{$name})) {
my $com = $gitinfo{$pfx . 'commit'} = find_commit($gitinfo{$name});
my $n = find_count($com);
if ($n =~ /^\d+$/) {
$gitinfo{$pfx . 'dist'} = $n;
}
}
}
unless (exists($gitinfo{$refpoint . '_version'})) {
die "reference point '$refpoint' doesn't exist";
}
@gitinfo{qw(refversion refdate refcommit refdist)} =
@gitinfo{map { "${refpoint}_$_" } qw(version date commit dist)};
last_commit_info(\%gitinfo);
git_describe(\%gitinfo);
($gitinfo{package_name}, $gitinfo{package_version}) = this_version;
if ($gitinfo{recent_version} =~ /^\d+\.\d+$/) {
$gitinfo{upload_dest} = 'ftp';
} else {
$gitinfo{upload_dest} = 'alpha';
}
}
$format = $fmtab{$format} while exists $fmtab{$format};
if (ref($format) eq 'CODE') {
&{$format}
} else {
$format = "$format\n" unless $format =~ /\n$/s;
print eval_format($format);
}
# Local Variables:
# mode: perl
# End:
|
