Add graft support.

We read .git/info/grafts and use the information in there to
override the list of parents we get from git-rev-list or
git-cat-file.

diff --git a/gitk b/gitk
index 6dc4b24..c443d95 100755 (executable)
--- a/gitk
+++ b/gitk
@@ -156,6 +156,7 @@ proc readcommit {id} {
 
 proc parsecommit {id contents listed} {
     global commitinfo children nchildren parents nparents cdate ncleft
+    global grafts
 
     set inhdr 1
     set comment {}
@@ -171,13 +172,32 @@ proc parsecommit {id contents listed} {
     }
     set parents($id) {}
     set nparents($id) 0
+    set grafted 0
+    if {[info exists grafts($id)]} {
+       set grafted 1
+       set parents($id) $grafts($id)
+       set nparents($id) [llength $grafts($id)]
+       if {$listed} {
+           foreach p $grafts($id) {
+               if {![info exists nchildren($p)]} {
+                   set children($p) [list $id]
+                   set nchildren($p) 1
+                   set ncleft($p) 1
+               } elseif {[lsearch -exact $children($p) $id] < 0} {
+                   lappend children($p) $id
+                   incr nchildren($p)
+                   incr ncleft($p)
+               }
+           }
+       }
+    }
     foreach line [split $contents "\n"] {
        if {$inhdr} {
            if {$line == {}} {
                set inhdr 0
            } else {
                set tag [lindex $line 0]
-               if {$tag == "parent"} {
+               if {$tag == "parent" && !$grafted} {
                    set p [lindex $line 1]
                    if {![info exists nchildren($p)]} {
                        set children($p) {}
@@ -273,6 +293,32 @@ proc readrefs {} {
     }
 }
 
+proc readgrafts {} {
+    global grafts env
+    catch {
+       set graftfile info/grafts
+       if {[info exists env(GIT_GRAFT_FILE)]} {
+           set graftfile $env(GIT_GRAFT_FILE)
+       }
+       set fd [open [gitdir]/$graftfile r]
+       while {[gets $fd line] >= 0} {
+           if {[string match "#*" $line]} continue
+           set ok 1
+           foreach x $line {
+               if {![regexp {^[0-9a-f]{40}$} $x]} {
+                   set ok 0
+                   break
+               }
+           }
+           if {$ok} {
+               set id [lindex $line 0]
+               set grafts($id) [lrange $line 1 end]
+           }
+       }
+       close $fd
+    }
+}
+
 proc error_popup msg {
     set w .error
     toplevel $w
@@ -3202,4 +3248,5 @@ set patchnum 0
 setcoords
 makewindow
 readrefs
+readgrafts
 getcommits $revtreeargs