Tools/Scripts/commit-log-editor - platform/external/webkit - Git at Google

 #!/usr/bin/perl -w

 # Copyright (C) 2006, 2007, 2008, 2009, 2010 Apple Inc.  All rights reserved.
 # Copyright (C) 2009 Torch Mobile Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions
 # are met:
 #
 # 1.  Redistributions of source code must retain the above copyright
 #     notice, this list of conditions and the following disclaimer.
 # 2.  Redistributions in binary form must reproduce the above copyright
 #     notice, this list of conditions and the following disclaimer in the
 #     documentation and/or other materials provided with the distribution.
 # 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
 #     its contributors may be used to endorse or promote products derived
 #     from this software without specific prior written permission.
 #
 # THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
 # EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 # DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 # DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 # (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 # LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 # ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 # Script to put change log comments in as default check-in comment.

 use strict;
 use File::Basename;
 use File::Spec;
 use FindBin;
 use lib $FindBin::Bin;
 use Term::ReadKey;
 use VCSUtils;
 use webkitdirs;

 sub fixEnvironment();
 sub normalizeLineEndings($$);
 sub removeLongestCommonPrefixEndingInDoubleNewline(\%);
 sub isCommitLogEditor($);

 sub usage
 {
     print "Usage: [--help] [--regenerate-log] <log file>\n";
     exit 1;
 }

 my $help = checkForArgumentAndRemoveFromARGV("--help");
 if ($help) {
     usage();
 }

 my $regenerateLog = checkForArgumentAndRemoveFromARGV("--regenerate-log");
 my $log = $ARGV[0];
 if (!$log) {
     usage();
 }

 fixEnvironment();

 my $baseDir = baseProductDir();

 my $editor = $ENV{SVN_LOG_EDITOR};
 $editor = $ENV{CVS_LOG_EDITOR} if !$editor;
 $editor = "" if $editor && isCommitLogEditor($editor);

 my $splitEditor = 1;
 if (!$editor) {
     my $builtEditorApplication = "$baseDir/Release/Commit Log Editor.app/Contents/MacOS/Commit Log Editor";
     if (-x $builtEditorApplication) {
         $editor = $builtEditorApplication;
         $splitEditor = 0;
     }
 }
 if (!$editor) {
     my $builtEditorApplication = "$baseDir/Debug/Commit Log Editor.app/Contents/MacOS/Commit Log Editor";
     if (-x $builtEditorApplication) {
         $editor = $builtEditorApplication;
         $splitEditor = 0;
     }
 }
 if (!$editor) {
     my $builtEditorApplication = "$ENV{HOME}/Applications/Commit Log Editor.app/Contents/MacOS/Commit Log Editor";
     if (-x $builtEditorApplication) {
         $editor = $builtEditorApplication;
         $splitEditor = 0;
     }
 }

 $editor = $ENV{EDITOR} if !$editor;
 $editor = "/usr/bin/vi" if !$editor;

 my @editor;
 if ($splitEditor) {
     @editor = split ' ', $editor;
 } else {
     @editor = ($editor);
 }

 my $inChangesToBeCommitted = !isGit();
 my @changeLogs = ();
 my $logContents = "";
 my $existingLog = 0;
 open LOG, $log or die "Could not open the log file.";
 while (<LOG>) {
     if (isGit()) {
         if (/^# Changes to be committed:$/) {
             $inChangesToBeCommitted = 1;
         } elsif ($inChangesToBeCommitted && /^# \S/) {
             $inChangesToBeCommitted = 0;
         }
     }

     if (!isGit() || /^#/) { #
         $logContents .= $_;
     } else {
         # $_ contains the current git log message
         # (without the log comment info). We don't need it.
     }
     $existingLog = isGit() && !(/^#/ || /^\s*$/) unless $existingLog;

     push @changeLogs, makeFilePathRelative($1) if $inChangesToBeCommitted && (/^(?:M|A)....(.*ChangeLog)\r?\n?$/ || /^#\t(?:modified|new file):   (.*ChangeLog)$/) && !/-ChangeLog$/;
 }
 close LOG;

 # We want to match the line endings of the existing log file in case they're
 # different from perl's line endings.
 my $endl = "\n";
 $endl = $1 if $logContents =~ /(\r?\n)/;

 my $keepExistingLog = 1;
 if ($regenerateLog && $existingLog && scalar(@changeLogs) > 0) {
     print "Existing log message detected, Use 'r' to regenerate log message from ChangeLogs, or any other key to keep the existing message.\n";
     ReadMode('cbreak');
     my $key = ReadKey(0);
     ReadMode('normal');
     $keepExistingLog = 0 if ($key eq "r");
 }

 # Don't change anything if there's already a log message (as can happen with git-commit --amend).
 exec (@editor, @ARGV) if $existingLog && $keepExistingLog;

 my $topLevel = determineVCSRoot();

 my %changeLogSort;
 my %changeLogContents;
 for my $changeLog (@changeLogs) {
     open CHANGELOG, $changeLog or die "Can't open $changeLog";
     my $contents = "";
     my $blankLines = "";
     my $reviewedByLine = "";
     my $lineCount = 0;
     my $date = "";
     my $author = "";
     my $email = "";
     my $hasAuthorInfoToWrite = 0;
     while (<CHANGELOG>) {
         if (/^\S/) {
             last if $contents;
         }
         if (/\S/) {
             my $previousLineWasBlank = 1 unless $blankLines eq "";
             my $line = $_;
             my $currentLineBlankLines = $blankLines;
             $blankLines = "";

             # Remove indentation spaces
             $line =~ s/^ {8}//;

             # Save the reviewed / rubber stamped by line.
             if ($line =~ m/^Reviewed by .*/ || $line =~ m/^Rubber[ \-]?stamped by .*/) {
                 $reviewedByLine = $line;
                 next;
             }

             # Grab the author and the date line
             if ($line =~ m/^([0-9]{4}-[0-9]{2}-[0-9]{2})\s+(.*[^\s])\s+<(.*)>/ && $lineCount == 0) {
                 $date = $1;
                 $author = $2;
                 $email = $3;
                 $hasAuthorInfoToWrite = 1;
                 next;
             }

             $contents .= $currentLineBlankLines if $contents;

             # Attempt to insert the "patch by" line, after the first blank line.
             if ($previousLineWasBlank && $hasAuthorInfoToWrite && $lineCount > 0) {
                 my $committerEmail = changeLogEmailAddress();
                 my $authorAndCommitterAreSamePerson = $email eq $committerEmail;
                 if (!$authorAndCommitterAreSamePerson) {
                     $contents .= "Patch by $author <$email> on $date\n";
                     $hasAuthorInfoToWrite = 0;
                 }
             }

             # Attempt to insert the "reviewed by" line, after the first blank line.
             if ($previousLineWasBlank && $reviewedByLine && $lineCount > 0) {
                 $contents .= $reviewedByLine . "\n";
                 $reviewedByLine = "";
             }

             $lineCount++;
             $contents .= $line;
         } else {
             $blankLines .= $_;
         }
     }
     if ($reviewedByLine) {
         $contents .= "\n".$reviewedByLine;
     }
     close CHANGELOG;

     $changeLog = File::Spec->abs2rel(File::Spec->rel2abs($changeLog), $topLevel);

     my $label = dirname($changeLog);
     $label = "top level" unless length $label;

     my $sortKey = lc $label;
     if ($label eq "top level") {
         $sortKey = "";
     } elsif ($label eq "LayoutTests") {
         $sortKey = lc "~, LayoutTests last";
     }

     $changeLogSort{$sortKey} = $label;
     $changeLogContents{$label} = $contents;
 }

 my $commonPrefix = removeLongestCommonPrefixEndingInDoubleNewline(%changeLogContents);

 my $first = 1;
 open NEWLOG, ">$log.edit" or die;
 if (isGit() && scalar keys %changeLogSort == 0) {
     # populate git commit message with WebKit-format ChangeLog entries unless explicitly disabled
     my $branch = gitBranch();
     chomp(my $webkitGenerateCommitMessage = `git config --bool branch.$branch.webkitGenerateCommitMessage`);
     if ($webkitGenerateCommitMessage eq "") {
         chomp($webkitGenerateCommitMessage = `git config --bool core.webkitGenerateCommitMessage`);
     }
     if ($webkitGenerateCommitMessage ne "false") {
         open CHANGELOG_ENTRIES, "-|", "$FindBin::Bin/prepare-ChangeLog --git-index --no-write" or die "prepare-ChangeLog failed: $!.\n";
         while (<CHANGELOG_ENTRIES>) {
             print NEWLOG normalizeLineEndings($_, $endl);
         }
         close CHANGELOG_ENTRIES;
     }
 } else {
     print NEWLOG normalizeLineEndings($commonPrefix, $endl);
     for my $sortKey (sort keys %changeLogSort) {
         my $label = $changeLogSort{$sortKey};
         if (keys %changeLogSort > 1) {
             print NEWLOG normalizeLineEndings("\n", $endl) if !$first;
             $first = 0;
             print NEWLOG normalizeLineEndings("$label: ", $endl);
         }
         print NEWLOG normalizeLineEndings($changeLogContents{$label}, $endl);
     }
 }
 print NEWLOG $logContents;
 close NEWLOG;

 system (@editor, "$log.edit");

 open NEWLOG, "$log.edit" or exit;
 my $foundComment = 0;
 while (<NEWLOG>) {
     $foundComment = 1 if (/\S/ && !/^CVS:/);
 }
 close NEWLOG;

 if ($foundComment) {
     open NEWLOG, "$log.edit" or die;
     open LOG, ">$log" or die;
     while (<NEWLOG>) {
         print LOG;
     }
     close LOG;
     close NEWLOG;
 }

 unlink "$log.edit";

 sub fixEnvironment()
 {
     return unless isMsys() && isGit();

     # When this script gets run from inside git commit, msys-style paths in the
     # environment will have been turned into Windows-style paths with forward
     # slashes. This screws up functions like File::Spec->rel2abs, which seem to
     # rely on $PWD having an msys-style path. We convert the paths back to
     # msys-style here by transforming "c:/foo" to "/c/foo" (e.g.). See
     # <http://webkit.org/b/48527>.
     foreach my $key (keys %ENV) {
         $ENV{$key} =~ s#^([[:alpha:]]):/#/$1/#;
     }
 }

 sub normalizeLineEndings($$)
 {
     my ($string, $endl) = @_;
     $string =~ s/\r?\n/$endl/g;
     return $string;
 }

 sub removeLongestCommonPrefixEndingInDoubleNewline(\%)
 {
     my ($hashOfStrings) = @_;

     my @strings = values %{$hashOfStrings};
     return "" unless @strings > 1;

     my $prefix = shift @strings;
     my $prefixLength = length $prefix;
     foreach my $string (@strings) {
         while ($prefixLength) {
             last if substr($string, 0, $prefixLength) eq $prefix;
             --$prefixLength;
             $prefix = substr($prefix, 0, -1);
         }
         last unless $prefixLength;
     }

     return "" unless $prefixLength;

     my $lastDoubleNewline = rindex($prefix, "\n\n");
     return "" unless $lastDoubleNewline > 0;

     foreach my $key (keys %{$hashOfStrings}) {
         $hashOfStrings->{$key} = substr($hashOfStrings->{$key}, $lastDoubleNewline);
     }
     return substr($prefix, 0, $lastDoubleNewline + 2);
 }

 sub isCommitLogEditor($)
 {
     my $editor = shift;
     return $editor =~ m/commit-log-editor/;
 }
	#!/usr/bin/perl -w

	# Copyright (C) 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
	# Copyright (C) 2009 Torch Mobile Inc. All rights reserved.
	#
	# Redistribution and use in source and binary forms, with or without
	# modification, are permitted provided that the following conditions
	# are met:
	#
	# 1. Redistributions of source code must retain the above copyright
	# notice, this list of conditions and the following disclaimer.
	# 2. Redistributions in binary form must reproduce the above copyright
	# notice, this list of conditions and the following disclaimer in the
	# documentation and/or other materials provided with the distribution.
	# 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
	# its contributors may be used to endorse or promote products derived
	# from this software without specific prior written permission.
	#
	# THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
	# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
	# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	# DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
	# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
	# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
	# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
	# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

	# Script to put change log comments in as default check-in comment.

	use strict;
	use File::Basename;
	use File::Spec;
	use FindBin;
	use lib $FindBin::Bin;
	use Term::ReadKey;
	use VCSUtils;
	use webkitdirs;

	sub fixEnvironment();
	sub normalizeLineEndings($$);
	sub removeLongestCommonPrefixEndingInDoubleNewline(\%);
	sub isCommitLogEditor($);

	sub usage
	{
	print "Usage: [--help] [--regenerate-log] <log file>\n";
	exit 1;
	}

	my $help = checkForArgumentAndRemoveFromARGV("--help");
	if ($help) {
	usage();
	}

	my $regenerateLog = checkForArgumentAndRemoveFromARGV("--regenerate-log");
	my $log = $ARGV[0];
	if (!$log) {
	usage();
	}

	fixEnvironment();

	my $baseDir = baseProductDir();

	my $editor = $ENV{SVN_LOG_EDITOR};
	$editor = $ENV{CVS_LOG_EDITOR} if !$editor;
	$editor = "" if $editor && isCommitLogEditor($editor);

	my $splitEditor = 1;
	if (!$editor) {
	my $builtEditorApplication = "$baseDir/Release/Commit Log Editor.app/Contents/MacOS/Commit Log Editor";
	if (-x $builtEditorApplication) {
	$editor = $builtEditorApplication;
	$splitEditor = 0;
	}
	}
	if (!$editor) {
	my $builtEditorApplication = "$baseDir/Debug/Commit Log Editor.app/Contents/MacOS/Commit Log Editor";
	if (-x $builtEditorApplication) {
	$editor = $builtEditorApplication;
	$splitEditor = 0;
	}
	}
	if (!$editor) {
	my $builtEditorApplication = "$ENV{HOME}/Applications/Commit Log Editor.app/Contents/MacOS/Commit Log Editor";
	if (-x $builtEditorApplication) {
	$editor = $builtEditorApplication;
	$splitEditor = 0;
	}
	}

	$editor = $ENV{EDITOR} if !$editor;
	$editor = "/usr/bin/vi" if !$editor;

	my @editor;
	if ($splitEditor) {
	@editor = split ' ', $editor;
	} else {
	@editor = ($editor);
	}

	my $inChangesToBeCommitted = !isGit();
	my @changeLogs = ();
	my $logContents = "";
	my $existingLog = 0;
	open LOG, $log or die "Could not open the log file.";
	while (<LOG>) {
	if (isGit()) {
	if (/^# Changes to be committed:$/) {
	$inChangesToBeCommitted = 1;
	} elsif ($inChangesToBeCommitted && /^# \S/) {
	$inChangesToBeCommitted = 0;
	}
	}

	if (!isGit() \|\| /^#/) { #
	$logContents .= $_;
	} else {
	# $_ contains the current git log message
	# (without the log comment info). We don't need it.
	}
	$existingLog = isGit() && !(/^#/ \|\| /^\s*$/) unless $existingLog;

	push @changeLogs, makeFilePathRelative($1) if $inChangesToBeCommitted && (/^(?:M\|A)....(.ChangeLog)\r?\n?$/ \|\| /^#\t(?:modified\|new file): (.ChangeLog)$/) && !/-ChangeLog$/;
	}
	close LOG;

	# We want to match the line endings of the existing log file in case they're
	# different from perl's line endings.
	my $endl = "\n";
	$endl = $1 if $logContents =~ /(\r?\n)/;

	my $keepExistingLog = 1;
	if ($regenerateLog && $existingLog && scalar(@changeLogs) > 0) {
	print "Existing log message detected, Use 'r' to regenerate log message from ChangeLogs, or any other key to keep the existing message.\n";
	ReadMode('cbreak');
	my $key = ReadKey(0);
	ReadMode('normal');
	$keepExistingLog = 0 if ($key eq "r");
	}

	# Don't change anything if there's already a log message (as can happen with git-commit --amend).
	exec (@editor, @ARGV) if $existingLog && $keepExistingLog;

	my $topLevel = determineVCSRoot();

	my %changeLogSort;
	my %changeLogContents;
	for my $changeLog (@changeLogs) {
	open CHANGELOG, $changeLog or die "Can't open $changeLog";
	my $contents = "";
	my $blankLines = "";
	my $reviewedByLine = "";
	my $lineCount = 0;
	my $date = "";
	my $author = "";
	my $email = "";
	my $hasAuthorInfoToWrite = 0;
	while (<CHANGELOG>) {
	if (/^\S/) {
	last if $contents;
	}
	if (/\S/) {
	my $previousLineWasBlank = 1 unless $blankLines eq "";
	my $line = $_;
	my $currentLineBlankLines = $blankLines;
	$blankLines = "";

	# Remove indentation spaces
	$line =~ s/^ {8}//;

	# Save the reviewed / rubber stamped by line.
	if ($line =~ m/^Reviewed by ./ \|\| $line =~ m/^Rubber[ \-]?stamped by ./) {
	$reviewedByLine = $line;
	next;
	}

	# Grab the author and the date line
	if ($line =~ m/^([0-9]{4}-[0-9]{2}-[0-9]{2})\s+(.[^\s])\s+<(.)>/ && $lineCount == 0) {
	$date = $1;
	$author = $2;
	$email = $3;
	$hasAuthorInfoToWrite = 1;
	next;
	}

	$contents .= $currentLineBlankLines if $contents;

	# Attempt to insert the "patch by" line, after the first blank line.
	if ($previousLineWasBlank && $hasAuthorInfoToWrite && $lineCount > 0) {
	my $committerEmail = changeLogEmailAddress();
	my $authorAndCommitterAreSamePerson = $email eq $committerEmail;
	if (!$authorAndCommitterAreSamePerson) {
	$contents .= "Patch by $author <$email> on $date\n";
	$hasAuthorInfoToWrite = 0;
	}
	}

	# Attempt to insert the "reviewed by" line, after the first blank line.
	if ($previousLineWasBlank && $reviewedByLine && $lineCount > 0) {
	$contents .= $reviewedByLine . "\n";
	$reviewedByLine = "";
	}

	$lineCount++;
	$contents .= $line;
	} else {
	$blankLines .= $_;
	}
	}
	if ($reviewedByLine) {
	$contents .= "\n".$reviewedByLine;
	}
	close CHANGELOG;

	$changeLog = File::Spec->abs2rel(File::Spec->rel2abs($changeLog), $topLevel);

	my $label = dirname($changeLog);
	$label = "top level" unless length $label;

	my $sortKey = lc $label;
	if ($label eq "top level") {
	$sortKey = "";
	} elsif ($label eq "LayoutTests") {
	$sortKey = lc "~, LayoutTests last";
	}

	$changeLogSort{$sortKey} = $label;
	$changeLogContents{$label} = $contents;
	}

	my $commonPrefix = removeLongestCommonPrefixEndingInDoubleNewline(%changeLogContents);

	my $first = 1;
	open NEWLOG, ">$log.edit" or die;
	if (isGit() && scalar keys %changeLogSort == 0) {
	# populate git commit message with WebKit-format ChangeLog entries unless explicitly disabled
	my $branch = gitBranch();
	chomp(my $webkitGenerateCommitMessage = `git config --bool branch.$branch.webkitGenerateCommitMessage`);
	if ($webkitGenerateCommitMessage eq "") {
	chomp($webkitGenerateCommitMessage = `git config --bool core.webkitGenerateCommitMessage`);
	}
	if ($webkitGenerateCommitMessage ne "false") {
	open CHANGELOG_ENTRIES, "-\|", "$FindBin::Bin/prepare-ChangeLog --git-index --no-write" or die "prepare-ChangeLog failed: $!.\n";
	while (<CHANGELOG_ENTRIES>) {
	print NEWLOG normalizeLineEndings($_, $endl);
	}
	close CHANGELOG_ENTRIES;
	}
	} else {
	print NEWLOG normalizeLineEndings($commonPrefix, $endl);
	for my $sortKey (sort keys %changeLogSort) {
	my $label = $changeLogSort{$sortKey};
	if (keys %changeLogSort > 1) {
	print NEWLOG normalizeLineEndings("\n", $endl) if !$first;
	$first = 0;
	print NEWLOG normalizeLineEndings("$label: ", $endl);
	}
	print NEWLOG normalizeLineEndings($changeLogContents{$label}, $endl);
	}
	}
	print NEWLOG $logContents;
	close NEWLOG;

	system (@editor, "$log.edit");

	open NEWLOG, "$log.edit" or exit;
	my $foundComment = 0;
	while (<NEWLOG>) {
	$foundComment = 1 if (/\S/ && !/^CVS:/);
	}
	close NEWLOG;

	if ($foundComment) {
	open NEWLOG, "$log.edit" or die;
	open LOG, ">$log" or die;
	while (<NEWLOG>) {
	print LOG;
	}
	close LOG;
	close NEWLOG;
	}

	unlink "$log.edit";

	sub fixEnvironment()
	{
	return unless isMsys() && isGit();

	# When this script gets run from inside git commit, msys-style paths in the
	# environment will have been turned into Windows-style paths with forward
	# slashes. This screws up functions like File::Spec->rel2abs, which seem to
	# rely on $PWD having an msys-style path. We convert the paths back to
	# msys-style here by transforming "c:/foo" to "/c/foo" (e.g.). See
	# <http://webkit.org/b/48527>.
	foreach my $key (keys %ENV) {
	$ENV{$key} =~ s#^([[:alpha:]]):/#/$1/#;
	}
	}

	sub normalizeLineEndings($$)
	{
	my ($string, $endl) = @_;
	$string =~ s/\r?\n/$endl/g;
	return $string;
	}

	sub removeLongestCommonPrefixEndingInDoubleNewline(\%)
	{
	my ($hashOfStrings) = @_;

	my @strings = values %{$hashOfStrings};
	return "" unless @strings > 1;

	my $prefix = shift @strings;
	my $prefixLength = length $prefix;
	foreach my $string (@strings) {
	while ($prefixLength) {
	last if substr($string, 0, $prefixLength) eq $prefix;
	--$prefixLength;
	$prefix = substr($prefix, 0, -1);
	}
	last unless $prefixLength;
	}

	return "" unless $prefixLength;

	my $lastDoubleNewline = rindex($prefix, "\n\n");
	return "" unless $lastDoubleNewline > 0;

	foreach my $key (keys %{$hashOfStrings}) {
	$hashOfStrings->{$key} = substr($hashOfStrings->{$key}, $lastDoubleNewline);
	}
	return substr($prefix, 0, $lastDoubleNewline + 2);
	}

	sub isCommitLogEditor($)
	{
	my $editor = shift;
	return $editor =~ m/commit-log-editor/;
	}