templatekw: add a {negrev} keyword
authorJordi Gutiérrez Hermoso <jordigh@octave.org>
Fri, 15 Feb 2019 14:43:31 -0500
changeset 41733 37b33c34bf4f
parent 41732 eb8a8af4cbd0
child 41734 ebbc4e70ebd1
templatekw: add a {negrev} keyword Revision numbers are getting much maligned for two reasons: they are too long in large repos and users get confused by their local-only nature. It just occurred to me that negative revision numbers avoid both of those problems. Since negative revision numbers change whenever the repo changes, it's much more obvious that they are a local-only convenience. Additionally, for the recent commits that we usually care about the most, negative revision numbers are always near zero. This commit adds a negrev templatekw to more easily expose negative revision numbers. It's not easy to reliably produce this output with existing keywords due to hidden commits while at the same time ensuring good performance.
mercurial/templatekw.py
tests/test-obsmarker-template.t
--- a/mercurial/templatekw.py	Sun Feb 17 22:39:12 2019 -0500
+++ b/mercurial/templatekw.py	Fri Feb 15 14:43:31 2019 -0500
@@ -554,6 +554,14 @@
 
     return _hybrid(f, namespaces, makemap, pycompat.identity)
 
+@templatekeyword('negrev', requires={'repo', 'ctx'})
+def shownegrev(context, mapping):
+    """Integer. The repository-local changeset negative revision number,
+    which counts in the opposite direction."""
+    ctx = context.resource(mapping, 'ctx')
+    repo = context.resource(mapping, 'repo')
+    return scmutil.intrev(ctx) - len(repo)
+
 @templatekeyword('node', requires={'ctx'})
 def shownode(context, mapping):
     """String. The changeset identification hash, as a 40 hexadecimal
--- a/tests/test-obsmarker-template.t	Sun Feb 17 22:39:12 2019 -0500
+++ b/tests/test-obsmarker-template.t	Fri Feb 15 14:43:31 2019 -0500
@@ -2429,6 +2429,23 @@
      date:        Thu Jan 01 00:00:00 1970 +0000
      summary:     ROOT
   
+Check that {negrev} shows usable negative revisions despite hidden commits
+
+  $ hg log -G -T "{negrev}\n"
+  @  -3
+  |
+  o  -4
+  
+
+  $ hg log -G -T "{negrev}\n" --hidden
+  x  -1
+  |
+  | x  -2
+  |/
+  | @  -3
+  |/
+  o  -4
+  
 
 Test templates with splitted and pruned commit
 ==============================================
@@ -2639,3 +2656,10 @@
   |/     Obsfate: rewritten using amend as 2:718c0d00cee1 by test (at 1970-01-01 00:00 +0000);
   o  ea207398892e
   
+  $ hg log -G -T "{negrev}\n"
+  @  -1
+  |
+  o  -2
+  |
+  o  -5
+