git-gui: Fix Blame Parent & Context for working copy lines.

Make Blame Parent Commit and Show History Context work
properly for lines blamed on the working copy.

Signed-off-by: Alexander Gavrilov <angavrilov@gmail.com>
Signed-off-by: Shawn O. Pearce <sop@google.com>

diff --git a/git-gui.sh b/git-gui.sh
index 10d8a4422f151eda78a24ff533eb20c3d775d099..9fbee24c2edf46e616cbc950c7233bfb2286654b 100755 (executable)
--- a/git-gui.sh
+++ b/git-gui.sh
@@ -1025,6 +1025,9 @@ set current_diff_path {}
 set is_3way_diff 0
 set selected_commit_type new
 
+set nullid "0000000000000000000000000000000000000000"
+set nullid2 "0000000000000000000000000000000000000001"
+
 ######################################################################
 ##
 ## task management

diff --git a/lib/blame.tcl b/lib/blame.tcl
index 827c85d67f0b0f18d22b1399624e6819cf93f23f..0d635cd3a7152402e2363d8f9fb041bdd4835f14 100644 (file)
--- a/lib/blame.tcl
+++ b/lib/blame.tcl
@@ -942,9 +942,20 @@ method _format_offset_date {base offset} {
 }
 
 method _gitkcommit {} {
+       global nullid
+
        set dat [_get_click_amov_info $this]
        if {$dat ne {}} {
                set cmit [lindex $dat 0]
+
+               # If the line belongs to the working copy, use HEAD instead
+               if {$cmit eq $nullid} {
+                       if {[catch {set cmit [git rev-parse --verify HEAD]} err]} {
+                               error_popup [strcat [mc "Cannot find HEAD commit:"] "\n\n$err"]
+                               return;
+                       }
+               }
+
                set radius [get_config gui.blamehistoryctx]
                set cmdline [list --select-commit=$cmit]
 
@@ -981,12 +992,20 @@ method _gitkcommit {} {
 }
 
 method _blameparent {} {
+       global nullid
+
        set dat [_get_click_amov_info $this]
        if {$dat ne {}} {
                set cmit [lindex $dat 0]
                set new_path [lindex $dat 1]
 
-               if {[catch {set cparent [git rev-parse --verify "$cmit^"]}]} {
+               # Allow using Blame Parent on lines modified in the working copy
+               if {$cmit eq $nullid} {
+                       set parent_ref "HEAD"
+               } else {
+                       set parent_ref "$cmit^"
+               }
+               if {[catch {set cparent [git rev-parse --verify $parent_ref]} err]} {
                        error_popup [strcat [mc "Cannot find parent commit:"] "\n\n$err"]
                        return;
                }
@@ -996,8 +1015,12 @@ method _blameparent {} {
                # Generate a diff between the commit and its parent,
                # and use the hunks to update the line number.
                # Request zero context to simplify calculations.
-               if {[catch {set fd [eval git_read diff-tree \
-                               --unified=0 $cparent $cmit $new_path]} err]} {
+               if {$cmit eq $nullid} {
+                       set diffcmd [list diff-index --unified=0 $cparent -- $new_path]
+               } else {
+                       set diffcmd [list diff-tree --unified=0 $cparent $cmit -- $new_path]
+               }
+               if {[catch {set fd [eval git_read $diffcmd]} err]} {
                        $status stop [mc "Unable to display parent"]
                        error_popup [strcat [mc "Error loading diff:"] "\n\n$err"]
                        return