strbuf: add strbuf_tolower function

diff --git a/git-difftool.perl b/git-difftool.perl
index e57d3d1295a5ba0a9c02c19df512c909a0631baa..18ca61e8d0493bde9c21ed337043bc72fa5c73a7 100755 (executable)
--- a/git-difftool.perl
+++ b/git-difftool.perl
@@ -39,24 +39,10 @@ sub usage
 
 sub find_worktree
 {
-       my ($repo) = @_;
-
        # Git->repository->wc_path() does not honor changes to the working
        # tree location made by $ENV{GIT_WORK_TREE} or the 'core.worktree'
        # config variable.
-       my $worktree;
-       my $env_worktree = $ENV{GIT_WORK_TREE};
-       my $core_worktree = Git::config('core.worktree');
-
-       if (defined($env_worktree) and (length($env_worktree) > 0)) {
-               $worktree = $env_worktree;
-       } elsif (defined($core_worktree) and (length($core_worktree) > 0)) {
-               $worktree = $core_worktree;
-       } else {
-               $worktree = $repo->wc_path();
-       }
-
-       return $worktree;
+       return Git::command_oneline('rev-parse', '--show-toplevel');
 }
 
 sub print_tool_help
@@ -418,7 +404,7 @@ sub dir_diff
        my $rc;
        my $error = 0;
        my $repo = Git->repository();
-       my $workdir = find_worktree($repo);
+       my $workdir = find_worktree();
        my ($a, $b, $tmpdir, @worktree) =
                setup_dir_diff($repo, $workdir, $symlinks);