Let core.attributesfile default to $XDG_CONFIG_HOME/git/attributes

diff --git a/git-difftool.perl b/git-difftool.perl
index 850ebbe5718b3b13404ff8c7e30de6df011b14cd..ae1e0525d89181f8adbe288b62e107b8dadb8ca1 100755 (executable)
--- a/git-difftool.perl
+++ b/git-difftool.perl
@@ -15,12 +15,14 @@
 use warnings;
 use File::Basename qw(dirname);
 use File::Copy;
+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();
@@ -30,7 +32,7 @@ sub usage
 {
        my $exitcode = shift;
        print << 'USAGE';
-usage: git difftool [-t|--tool=<tool>]
+usage: git difftool [-t|--tool=<tool>] [--tool-help]
                     [-x|--extcmd=<cmd>]
                     [-g|--gui] [--no-gui]
                     [--prompt] [-y|--no-prompt]
@@ -62,6 +64,51 @@ 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");
+
+       foreach my $tool (@tools) {
+               $cmd  = "TOOL_MODE=diff";
+               $cmd .= ' && . "$(git --exec-path)/git-mergetool--lib"';
+               $cmd .= " && get_merge_tool_path $tool >/dev/null 2>&1";
+               $cmd .= " && can_diff >/dev/null 2>&1";
+               if (system('sh', '-c', $cmd) == 0) {
+                       push(@found, $tool);
+               } else {
+                       push(@notfound, $tool);
+               }
+       }
+
+       print "'git difftool --tool=<tool>' may be set to one of the following:\n";
+       print "\t$_\n" for (sort(@found));
+
+       print "\nThe following tools are valid, but not currently available:\n";
+       print "\t$_\n" for (sort(@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";
+
+       exit(0);
+}
+
 sub setup_dir_diff
 {
        # Run the diff; exit immediately if no diff found
@@ -230,18 +277,22 @@ sub write_to_file
 
 # parse command-line options. all unrecognized options and arguments
 # are passed through to the 'git diff' command.
-my ($difftool_cmd, $dirdiff, $extcmd, $gui, $help, $prompt);
+my ($difftool_cmd, $dirdiff, $extcmd, $gui, $help, $prompt, $tool_help);
 GetOptions('g|gui!' => \$gui,
        'd|dir-diff' => \$dirdiff,
        'h' => \$help,
        'prompt!' => \$prompt,
        'y' => sub { $prompt = 0; },
        't|tool:s' => \$difftool_cmd,
+       'tool-help' => \$tool_help,
        'x|extcmd:s' => \$extcmd);
 
 if (defined($help)) {
        usage(0);
 }
+if (defined($tool_help)) {
+       print_tool_help();
+}
 if (defined($difftool_cmd)) {
        if (length($difftool_cmd) > 0) {
                $ENV{GIT_DIFF_TOOL} = $difftool_cmd;