# HG changeset patch
# User Jordi Gutiérrez Hermoso <jord...@octave.org>
# Date 1550259811 18000
# Fri Feb 15 14:43:31 2019 -0500
# Node ID 2aa9472715119f26f2e688dd9130f717113ec518
# Parent a22321f2b1ee18ea09a70fee9e524d2f0298aaaa
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.
diff --git a/mercurial/templatekw.py b/mercurial/templatekw.py
--- a/mercurial/templatekw.py
+++ b/mercurial/templatekw.py
@@ -777,6 +777,14 @@ def showrev(context, mapping):
ctx = context.resource(mapping, 'ctx')
return scmutil.intrev(ctx)
+@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)
+
def showrevslist(context, mapping, name, revs):
"""helper to generate a list of revisions in which a mapped template will
be evaluated"""
diff --git a/tests/test-obsmarker-template.t b/tests/test-obsmarker-template.t
--- a/tests/test-obsmarker-template.t
+++ b/tests/test-obsmarker-template.t
@@ -2429,6 +2429,23 @@ Check other fatelog implementations
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 @@ metadata should be converted back to loc
|/ 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
+
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