+ cd $current_diff_path
+ if {$revs eq {--}} {
+ set s $file_states($current_diff_path)
+ set old_sha1 {}
+ set new_sha1 {}
+ switch -glob -- [lindex $s 0] {
+ M_ { set old_sha1 [lindex [lindex $s 2] 1] }
+ _M { set old_sha1 [lindex [lindex $s 3] 1] }
+ MM {
+ if {$current_diff_side eq $ui_index} {
+ set old_sha1 [lindex [lindex $s 2] 1]
+ set new_sha1 [lindex [lindex $s 3] 1]
+ } else {
+ set old_sha1 [lindex [lindex $s 3] 1]
+ }
+ }
+ }
+ set revs $old_sha1...$new_sha1
+ }
+ # GIT_DIR and GIT_WORK_TREE for the submodule are not the ones
+ # we've been using for the main repository, so unset them.
+ # TODO we could make life easier (start up faster?) for gitk
+ # by setting these to the appropriate values to allow gitk
+ # to skip the heuristics to find their proper value
+ unset env(GIT_DIR)
+ unset env(GIT_WORK_TREE)
+ }
+ eval exec $cmd $revs "--" "--" &
+
+ set env(GIT_DIR) $_gitdir
+ set env(GIT_WORK_TREE) $_gitworktree
+ cd $pwd
+
+ ui_status $::starting_gitk_msg
+ after 10000 {
+ ui_ready $starting_gitk_msg