+ if ($arg eq '-x' || $arg eq '--extcmd') {
+ usage() if $#ARGV <= $idx;
+ $ENV{GIT_DIFFTOOL_EXTCMD} = $ARGV[$idx + 1];
+ $skip_next = 1;
+ next;
+ }
+ if ($arg =~ /^--extcmd=/) {
+ $ENV{GIT_DIFFTOOL_EXTCMD} = substr($arg, 9);
+ next;
+ }
+ if ($arg eq '-g' || $arg eq '--gui') {
+ eval {
+ my $tool = Git::command_oneline('config',
+ 'diff.guitool');
+ if (length($tool)) {
+ $ENV{GIT_DIFF_TOOL} = $tool;
+ }
+ };
+ next;
+ }