# HG changeset patch
# User Pulkit Goyal <7895pulkit@gmail.com>
# Date 1515670870 -19800
# Node ID 6d345d7ca682b01242d1dcb0f0a0cb2d5421a4fd
# Parent  4adf46158b9b7360ec61a8e5e1cc3add5be63e14
obslog: add header to the changeset description diff

This patch adds `diff -r <hash> -r <hash> <filename>` header to the output of
the changeset description diff which is shown using the --patch flag of obslog
command.

This fixes the label/color issue for description diff also.

diff -r 4adf46158b9b -r 6d345d7ca682 hgext3rd/evolve/obshistory.py
--- a/hgext3rd/evolve/obshistory.py	Thu Jan 11 16:30:46 2018 +0530
+++ b/hgext3rd/evolve/obshistory.py	Thu Jan 11 17:11:10 2018 +0530
@@ -176,8 +176,8 @@
     succdesc = succctx.description() + '\n'
 
     # fake file name
-    basename = "%s-changeset-description" % basectx
-    succname = "%s-changeset-description" % succctx
+    basename = "changeset-description"
+    succname = "changeset-description"
 
     d = mdiff.unidiff(basedesc, '', succdesc, '', basename, succname)
     # mercurial 4.1 and before return the patch directly
@@ -189,6 +189,7 @@
         # Copied from patch.diff
         text = ''.join(sum((list(hlines) for hrange, hlines in hunks), []))
         patch = "\n".join(uheaders + [text])
+
     return patch
 
 class missingchangectx(object):
@@ -503,15 +504,19 @@
             descriptionpatch = getmarkerdescriptionpatch(repo, node, succ)
 
             if descriptionpatch:
-                fm.plain("\n")
+                # add the diffheader
+                diffheader = "diff -r %s -r %s changeset-description\n" % \
+                             (repo[node], repo[succ])
+                descriptionpatch = diffheader + descriptionpatch
 
                 def tolist(text):
                     return [text]
 
+                fm.plain("\n")
+
                 for chunk, label in patch.difflabel(tolist, descriptionpatch):
-                    if chunk == '\t':
-                        continue
-                    if chunk != '\n':
+                    chunk = chunk.strip('\t')
+                    if chunk and chunk != '\n':
                         fm.plain('    ')
                     fm.write('desc-diff', '%s', chunk, label=label)
 
diff -r 4adf46158b9b -r 6d345d7ca682 tests/test-evolve-obshistory.t
--- a/tests/test-evolve-obshistory.t	Thu Jan 11 16:30:46 2018 +0530
+++ b/tests/test-evolve-obshistory.t	Thu Jan 11 17:11:10 2018 +0530
@@ -56,8 +56,9 @@
   |
   x  471f378eab4c (1) A0
        rewritten(description, content) as 4ae3a4151de9 by test (*) (glob)
-         --- a/471f378eab4c-changeset-description
-         +++ b/4ae3a4151de9-changeset-description
+         diff -r 471f378eab4c -r 4ae3a4151de9 changeset-description
+         --- a/changeset-description
+         +++ b/changeset-description
          @@ -1,1 +1,3 @@
          -A0
          +A1
@@ -77,8 +78,9 @@
   |
   x  [evolve.node|471f378eab4c] [evolve.rev|(1)] [evolve.short_description|A0]
        [evolve.verb|rewritten](description, content) as [evolve.node|4ae3a4151de9] by [evolve.user|test] [evolve.date|(Thu Jan 01 00:00:00 1970 +0000)]
-         [diff.deleted|--- a/471f378eab4c-changeset-description]
-         [diff.inserted|+++ b/4ae3a4151de9-changeset-description]
+         [diff.diffline|diff -r 471f378eab4c -r 4ae3a4151de9 changeset-description]
+         [diff.file_a|--- a/changeset-description]
+         [diff.file_b|+++ b/changeset-description]
          [diff.hunk|@@ -1,1 +1,3 @@]
          [diff.deleted|-A0]
          [diff.inserted|+A1]
@@ -98,14 +100,15 @@
   4ae3a4151de9 (2) A1
   471f378eab4c (1) A0
     rewritten(description, content) as 4ae3a4151de9 by test (Thu Jan 01 00:00:00 1970 +0000)
-      --- a/471f378eab4c-changeset-description
-      +++ b/4ae3a4151de9-changeset-description
+      diff -r 471f378eab4c -r 4ae3a4151de9 changeset-description
+      --- a/changeset-description
+      +++ b/changeset-description
       @@ -1,1 +1,3 @@
       -A0
       +A1
       +
       +Better commit message
-      
+  
       diff -r 471f378eab4c -r 4ae3a4151de9 A0
       --- a/A0	Thu Jan 01 00:00:00 1970 +0000
       +++ b/A0	Thu Jan 01 00:00:00 1970 +0000
@@ -153,8 +156,9 @@
   $ hg obslog --hidden --patch 471f378eab4c
   x  471f378eab4c (1) A0
        rewritten(description, content) as 4ae3a4151de9 by test (*) (glob)
-         --- a/471f378eab4c-changeset-description
-         +++ b/4ae3a4151de9-changeset-description
+         diff -r 471f378eab4c -r 4ae3a4151de9 changeset-description
+         --- a/changeset-description
+         +++ b/changeset-description
          @@ -1,1 +1,3 @@
          -A0
          +A1
@@ -844,8 +848,9 @@
   $ hg obslog --hidden 471f378eab4c --patch
   x  471f378eab4c (1) A0
        rewritten(description, content) as eb5a0daa2192 by test (*) (glob)
-         --- a/471f378eab4c-changeset-description
-         +++ b/eb5a0daa2192-changeset-description
+         diff -r 471f378eab4c -r eb5a0daa2192 changeset-description
+         --- a/changeset-description
+         +++ b/changeset-description
          @@ -1,1 +1,1 @@
          -A0
          +C0
@@ -867,8 +872,9 @@
   |
   x  471f378eab4c (1) A0
        rewritten(description, content) as eb5a0daa2192 by test (*) (glob)
-         --- a/471f378eab4c-changeset-description
-         +++ b/eb5a0daa2192-changeset-description
+         diff -r 471f378eab4c -r eb5a0daa2192 changeset-description
+         --- a/changeset-description
+         +++ b/changeset-description
          @@ -1,1 +1,1 @@
          -A0
          +C0
@@ -897,8 +903,9 @@
   |
   x  471f378eab4c (1) A0
        rewritten(description, content) as eb5a0daa2192 by test (*) (glob)
-         --- a/471f378eab4c-changeset-description
-         +++ b/eb5a0daa2192-changeset-description
+         diff -r 471f378eab4c -r eb5a0daa2192 changeset-description
+         --- a/changeset-description
+         +++ b/changeset-description
          @@ -1,1 +1,1 @@
          -A0
          +C0
@@ -921,8 +928,9 @@
   |
   x  471f378eab4c (1) A0
        rewritten(description, content) as eb5a0daa2192 by test (*) (glob)
-         --- a/471f378eab4c-changeset-description
-         +++ b/eb5a0daa2192-changeset-description
+         diff -r 471f378eab4c -r eb5a0daa2192 changeset-description
+         --- a/changeset-description
+         +++ b/changeset-description
          @@ -1,1 +1,1 @@
          -A0
          +C0
@@ -1079,15 +1087,17 @@
   $ hg obslog --hidden 471f378eab4c --patch
   x  471f378eab4c (1) A0
        rewritten(description) as 65b757b745b9 by test (*) (glob)
-         --- a/471f378eab4c-changeset-description
-         +++ b/65b757b745b9-changeset-description
+         diff -r 471f378eab4c -r 65b757b745b9 changeset-description
+         --- a/changeset-description
+         +++ b/changeset-description
          @@ -1,1 +1,1 @@
          -A0
          +A2
   
        rewritten(description) as fdf9bde5129a by test (*) (glob)
-         --- a/471f378eab4c-changeset-description
-         +++ b/fdf9bde5129a-changeset-description
+         diff -r 471f378eab4c -r fdf9bde5129a changeset-description
+         --- a/changeset-description
+         +++ b/changeset-description
          @@ -1,1 +1,1 @@
          -A0
          +A1
@@ -1102,15 +1112,17 @@
   |/
   x  471f378eab4c (1) A0
        rewritten(description) as 65b757b745b9 by test (*) (glob)
-         --- a/471f378eab4c-changeset-description
-         +++ b/65b757b745b9-changeset-description
+         diff -r 471f378eab4c -r 65b757b745b9 changeset-description
+         --- a/changeset-description
+         +++ b/changeset-description
          @@ -1,1 +1,1 @@
          -A0
          +A2
   
        rewritten(description) as fdf9bde5129a by test (*) (glob)
-         --- a/471f378eab4c-changeset-description
-         +++ b/fdf9bde5129a-changeset-description
+         diff -r 471f378eab4c -r fdf9bde5129a changeset-description
+         --- a/changeset-description
+         +++ b/changeset-description
          @@ -1,1 +1,1 @@
          -A0
          +A1
@@ -1161,15 +1173,17 @@
   |
   x  471f378eab4c (1) A0
        rewritten(description) as 65b757b745b9 by test (*) (glob)
-         --- a/471f378eab4c-changeset-description
-         +++ b/65b757b745b9-changeset-description
+         diff -r 471f378eab4c -r 65b757b745b9 changeset-description
+         --- a/changeset-description
+         +++ b/changeset-description
          @@ -1,1 +1,1 @@
          -A0
          +A2
   
        rewritten(description) as fdf9bde5129a by test (*) (glob)
-         --- a/471f378eab4c-changeset-description
-         +++ b/fdf9bde5129a-changeset-description
+         diff -r 471f378eab4c -r fdf9bde5129a changeset-description
+         --- a/changeset-description
+         +++ b/changeset-description
          @@ -1,1 +1,1 @@
          -A0
          +A1
@@ -1184,15 +1198,17 @@
   |/
   x  471f378eab4c (1) A0
        rewritten(description) as 65b757b745b9 by test (*) (glob)
-         --- a/471f378eab4c-changeset-description
-         +++ b/65b757b745b9-changeset-description
+         diff -r 471f378eab4c -r 65b757b745b9 changeset-description
+         --- a/changeset-description
+         +++ b/changeset-description
          @@ -1,1 +1,1 @@
          -A0
          +A2
   
        rewritten(description) as fdf9bde5129a by test (*) (glob)
-         --- a/471f378eab4c-changeset-description
-         +++ b/fdf9bde5129a-changeset-description
+         diff -r 471f378eab4c -r fdf9bde5129a changeset-description
+         --- a/changeset-description
+         +++ b/changeset-description
          @@ -1,1 +1,1 @@
          -A0
          +A1
@@ -1205,15 +1221,17 @@
   |
   x  471f378eab4c (1) A0
        rewritten(description) as 65b757b745b9 by test (*) (glob)
-         --- a/471f378eab4c-changeset-description
-         +++ b/65b757b745b9-changeset-description
+         diff -r 471f378eab4c -r 65b757b745b9 changeset-description
+         --- a/changeset-description
+         +++ b/changeset-description
          @@ -1,1 +1,1 @@
          -A0
          +A2
   
        rewritten(description) as fdf9bde5129a by test (*) (glob)
-         --- a/471f378eab4c-changeset-description
-         +++ b/fdf9bde5129a-changeset-description
+         diff -r 471f378eab4c -r fdf9bde5129a changeset-description
+         --- a/changeset-description
+         +++ b/changeset-description
          @@ -1,1 +1,1 @@
          -A0
          +A1
@@ -1227,15 +1245,17 @@
   |/
   x  471f378eab4c (1) A0
        rewritten(description) as 65b757b745b9 by test (*) (glob)
-         --- a/471f378eab4c-changeset-description
-         +++ b/65b757b745b9-changeset-description
+         diff -r 471f378eab4c -r 65b757b745b9 changeset-description
+         --- a/changeset-description
+         +++ b/changeset-description
          @@ -1,1 +1,1 @@
          -A0
          +A2
   
        rewritten(description) as fdf9bde5129a by test (*) (glob)
-         --- a/471f378eab4c-changeset-description
-         +++ b/fdf9bde5129a-changeset-description
+         diff -r 471f378eab4c -r fdf9bde5129a changeset-description
+         --- a/changeset-description
+         +++ b/changeset-description
          @@ -1,1 +1,1 @@
          -A0
          +A1
@@ -1250,15 +1270,17 @@
   |/
   x  471f378eab4c (1) A0
        rewritten(description) as 65b757b745b9 by test (*) (glob)
-         --- a/471f378eab4c-changeset-description
-         +++ b/65b757b745b9-changeset-description
+         diff -r 471f378eab4c -r 65b757b745b9 changeset-description
+         --- a/changeset-description
+         +++ b/changeset-description
          @@ -1,1 +1,1 @@
          -A0
          +A2
   
        rewritten(description) as fdf9bde5129a by test (*) (glob)
-         --- a/471f378eab4c-changeset-description
-         +++ b/fdf9bde5129a-changeset-description
+         diff -r 471f378eab4c -r fdf9bde5129a changeset-description
+         --- a/changeset-description
+         +++ b/changeset-description
          @@ -1,1 +1,1 @@
          -A0
          +A1
@@ -1404,8 +1426,9 @@
   |\
   x |  471f378eab4c (1) A0
    /     rewritten(description, content) as eb5a0daa2192 by test (*) (glob)
-  |        --- a/471f378eab4c-changeset-description
-  |        +++ b/eb5a0daa2192-changeset-description
+  |        diff -r 471f378eab4c -r eb5a0daa2192 changeset-description
+  |        --- a/changeset-description
+  |        +++ b/changeset-description
   |        @@ -1,1 +1,1 @@
   |        -A0
   |        +C0
@@ -1423,8 +1446,9 @@
   |
   x  0dec01379d3b (2) B0
        rewritten(description) as b7ea6d14e664 by test (*) (glob)
-         --- a/0dec01379d3b-changeset-description
-         +++ b/b7ea6d14e664-changeset-description
+         diff -r 0dec01379d3b -r b7ea6d14e664 changeset-description
+         --- a/changeset-description
+         +++ b/changeset-description
          @@ -1,1 +1,1 @@
          -B0
          +B1
@@ -1436,8 +1460,9 @@
   |\
   x |  471f378eab4c (1) A0
    /     rewritten(description, content) as eb5a0daa2192 by test (*) (glob)
-  |        --- a/471f378eab4c-changeset-description
-  |        +++ b/eb5a0daa2192-changeset-description
+  |        diff -r 471f378eab4c -r eb5a0daa2192 changeset-description
+  |        --- a/changeset-description
+  |        +++ b/changeset-description
   |        @@ -1,1 +1,1 @@
   |        -A0
   |        +C0
@@ -1455,8 +1480,9 @@
   |
   x  0dec01379d3b (2) B0
        rewritten(description) as b7ea6d14e664 by test (*) (glob)
-         --- a/0dec01379d3b-changeset-description
-         +++ b/b7ea6d14e664-changeset-description
+         diff -r 0dec01379d3b -r b7ea6d14e664 changeset-description
+         --- a/changeset-description
+         +++ b/changeset-description
          @@ -1,1 +1,1 @@
          -B0
          +B1
@@ -1631,8 +1657,9 @@
   |
   x  fdf9bde5129a (2) A1
   |    rewritten(description) as 7a230b46bf61 by test (*) (glob)
-  |      --- a/fdf9bde5129a-changeset-description
-  |      +++ b/7a230b46bf61-changeset-description
+  |      diff -r fdf9bde5129a -r 7a230b46bf61 changeset-description
+  |      --- a/changeset-description
+  |      +++ b/changeset-description
   |      @@ -1,1 +1,1 @@
   |      -A1
   |      +A2
@@ -1640,8 +1667,9 @@
   |
   x  471f378eab4c (1) A0
        rewritten(description) as fdf9bde5129a by test (*) (glob)
-         --- a/471f378eab4c-changeset-description
-         +++ b/fdf9bde5129a-changeset-description
+         diff -r 471f378eab4c -r fdf9bde5129a changeset-description
+         --- a/changeset-description
+         +++ b/changeset-description
          @@ -1,1 +1,1 @@
          -A0
          +A1