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#!/usr/bin/env perl
#
# SPDX-License-Identifier: ISC
#
# Copyright (c) 2017, 2020 Todd C. Miller <Todd.Miller@sudo.ws>
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#
# Simple script to massage "git log" output into a GNU style ChangeLog.
# The goal is to emulate "hg log --style=changelog" via perl format.
use Getopt::Std;
use Text::Wrap;
use strict;
use warnings;
# Git log format: author date, author name, author email
# abbreviated commit hash
# raw commit body
my $format="%ad %aN <%aE>%n%h%n%B%n";
# Parse options and build up "git log" command
my @cmd = ( "git" );
my %opts;
getopts('b:R:', \%opts);
push(@cmd, "-b", $opts{"b"}) if exists $opts{"b"};
push(@cmd, "--git-dir", $opts{"R"}) if exists $opts{"R"};
push(@cmd, "log", "--log-size", "--name-only", "--date=short", "--format=$format", @ARGV);
open(LOG, '-|', @cmd) || die "$0: unable to run git log: $!";
my $hash;
my $body;
my @files;
my $key_date = "";
my $log_size = 0;
my @lines;
# Wrap like "hg log --style=changelog"
$Text::Wrap::columns = 77;
while (<LOG>) {
chomp;
if (/^log size (\d+)$/) {
$log_size = $1;
# Print previous entry if there is one
print_entry($hash, $body, @files) if defined($hash);
# Init new entry
undef $hash;
undef $body;
undef @files;
undef @lines;
# Read entry and split on newlines
read(LOG, my $buf, $log_size) ||
die "$0: unable to read $log_size bytes: $!\n";
@lines = split(/\r?\n/, $buf);
# Check for continued entry (duplicate Date + Author)
$_ = shift(@lines);
if ($_ ne $key_date) {
# New entry
print "$_\n\n";
$key_date = $_;
}
# Hash comes first
$hash = shift(@lines);
# Commit message body (multi-line)
my $sep = "";
foreach (@lines) {
last if $_ eq "--HG--";
if ($_ eq "") {
$sep = "\n\n";
next;
}
s/^\s+//;
s/\s+$//;
$body .= ${sep} . $_;
$sep = " ";
}
} else {
# Not a log entry, must be the file list
push(@files, $_) unless $_ eq "";
}
}
# Print the last entry
print_entry($hash, $body, @files) if defined($hash);
exit(0);
sub print_entry
{
my $hash = shift;
my $body = shift;
my $files = "* " . join(", ", @_) . ":";
print wrap("\t", "\t", $files) . "\n";
print wrap("\t", "\t", $body) . "\n";
print "\t[$hash]\n\n";
}
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