[PATCH 5/6] gitk: Add a "Save file as" menu item

[Pierre Dumuid <pmdumuid@gmail.com>]

Previously, there was no easy way to save a particular file from the
currently selected revision.

This patch adds a menu item "Save file as" to the file list popup
menu, which opens a file selection dialog to determine the name under
which a file should be saved.  The default filename is of the form
"[shortid] basename".  If the current revision is the index, the
default pattern is of the form "[index] basename".  This works for
both, the "Patch" and "Tree" view.  The menu item is disabled for the
"local uncommitted changes" fake revision.

Signed-off-by: Andreas Amann <andreas.amann@web.de>
Signed-off-by: Pierre Dumuid <pmdumuid@gmail.com>
---
 gitk | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/gitk b/gitk
index 5f27716..0903d2d 100755
--- a/gitk
+++ b/gitk
@@ -2693,6 +2693,7 @@ proc makewindow {} {
 	{mc "Highlight this too" command {flist_hl 0}}
 	{mc "Highlight this only" command {flist_hl 1}}
 	{mc "External diff" command {external_diff}}
+	{mc "Save file as" command {save_file_as}}
 	{mc "Blame parent commit" command {external_blame 1}}
 	{mc "Copy path" command {clipboard clear; clipboard append $flist_menu_file}}
     }
@@ -3504,6 +3505,7 @@ proc sel_flist {w x y} {
 proc pop_flist_menu {w X Y x y} {
     global ctext cflist cmitmode flist_menu flist_menu_file
     global treediffs diffids
+    global nullid
 
     stopfinding
     set l [lindex [split [$w index "@$x,$y"] "."] 0]
@@ -3521,6 +3523,12 @@ proc pop_flist_menu {w X Y x y} {
     }
     # Disable "External diff" item in tree mode
     $flist_menu entryconf 2 -state $xdiffstate
+    set savefilestate "normal"
+    if {[lindex $diffids 0] eq $nullid} {
+	set savefilestate "disabled"
+    }
+    # Disable "Save file as" item "local uncommited changes" revision
+    $flist_menu entryconf 3 -state $savefilestate
     tk_popup $flist_menu $X $Y
 }
 
@@ -3632,6 +3640,34 @@ proc external_diff_get_one_file {diffid filename diffdir} {
 	       "revision $diffid"]
 }
 
+proc save_file_as {} {
+    global nullid nullid2
+    global flist_menu_file cmitmode
+    global diffids
+
+    set diffid [lindex $diffids 0]
+    if {$diffid == $nullid} {
+	return
+    } elseif {$diffid == $nullid2} {
+	set diffidtext [mc "index"]
+	set diffid ""
+	set whattext $diffidtext
+    } else {
+	set diffidtext [shortids $diffid]
+	set whattext "[mc "revision"] $diffidtext"
+    }
+    set diffid $diffid:
+    if {$cmitmode eq "tree"} {
+	set diffid $diffid./
+    }
+    set difffile "\[$diffidtext\] [file tail $flist_menu_file]"
+    set difffile [tk_getSaveFile -initialfile $difffile -title [mc "Save file as"] -parent .]
+    if {$difffile eq {}} {
+	return
+    }
+    save_file_from_commit $diffid$flist_menu_file $difffile $whattext
+}
+
 proc external_diff {} {
     global nullid nullid2
     global flist_menu_file
-- 
2.10.2