difftool: Simplify print_tool_help()

Eliminate a global variable and File::Find usage by building upon
basename() and glob() instead.

Signed-off-by: David Aguilar <davvid@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

git-difftool.perl

@@ -13,17 +13,15 @@
 use 5.008;
 use strict;
 use warnings;
-use File::Basename qw(dirname);
+use File::Basename qw(basename dirname);
 use File::Copy;
 use File::Compare;
-use File::Find;
 use File::stat;
 use File::Path qw(mkpath);
 use File::Temp qw(tempdir);
 use Getopt::Long qw(:config pass_through);
 use Git;
 
-my @tools;
 my @working_tree;
 my $rc;
 my $repo = Git->repository();
@@ -65,26 +63,13 @@ sub find_worktree
 
 my $workdir = find_worktree();
 
-sub filter_tool_scripts
-{
-	if (-d $_) {
-		if ($_ ne ".") {
-			# Ignore files in subdirectories
-			$File::Find::prune = 1;
-		}
-	} else {
-		if ((-f $_) && ($_ ne "defaults")) {
-			push(@tools, $_);
-		}
-	}
-}
-
 sub print_tool_help
 {
 	my ($cmd, @found, @notfound);
 	my $gitpath = Git::exec_path();
 
-	find(\&filter_tool_scripts, "$gitpath/mergetools");
+	my @files = map { basename($_) } glob("$gitpath/mergetools/*");
+	my @tools = sort(grep { !m{^defaults$} } @files);
 
 	foreach my $tool (@tools) {
 		$cmd  = "TOOL_MODE=diff";
@@ -99,10 +84,10 @@ sub print_tool_help
 	}
 
 	print "'git difftool --tool=<tool>' may be set to one of the following:\n";
-	print "\t$_\n" for (sort(@found));
+	print "\t$_\n" for (@found);
 
 	print "\nThe following tools are valid, but not currently available:\n";
-	print "\t$_\n" for (sort(@notfound));
+	print "\t$_\n" for (@notfound);
 
 	print "\nNOTE: Some of the tools listed above only work in a windowed\n";
 	print "environment. If run in a terminal-only session, they will fail.\n";