git-gui: Correct toggling of added/untracked status for new files.

New files also lack index data from diff-files therefore we cannot use
their diff-files index data when we update-index.  Instead we can use
the fact that Git has them hardcoded as "0 0{40}" and do the same thing
ourselves.  This way you can toggle an untracked file into added status
and back out to untracked.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

diff --git a/git-gui b/git-gui
index 3f7e40835656bac8ac6eeab1af43d4ca74fdeec5..75d1640c0fbd2c74c0b7a523f37658ed313531ec 100755 (executable)
--- a/git-gui
+++ b/git-gui
@@ -1174,9 +1174,10 @@ proc short_path {path} {
 }
 
 set next_icon_id 0
+set null_sha1 [string repeat 0 40]
 
 proc merge_state {path new_state {head_info {}} {index_info {}}} {
-       global file_states next_icon_id
+       global file_states next_icon_id null_sha1
 
        set s0 [string index $new_state 0]
        set s1 [string index $new_state 1]
@@ -1197,7 +1198,9 @@ proc merge_state {path new_state {head_info {}} {index_info {}}} {
        if     {$s1 eq {?}} {set s1 [string index $state 1]} \
        elseif {$s1 eq {_}} {set s1 _}
 
-       if {$s0 ne {_} && [string index $state 0] eq {_}
+       if {$s0 eq {A} && $s1 eq {_} && $head_info eq {}} {
+               set head_info [list 0 $null_sha1]
+       } elseif {$s0 ne {_} && [string index $state 0] eq {_}
                && $head_info eq {}} {
                set head_info $index_info
        }