templates: add whyunstable template keyword

mercurial/templatekw.py

@@ -793,6 +793,28 b' def showverbosity(context, mapping):'
         return 'verbose'
     return ''
 
+@templatekeyword('whyunstable', requires={'repo', 'ctx'})
+def showwhyunstable(context, mapping):
+    """List of dicts explaining all instabilities of a changeset.
+    (EXPERIMENTAL)
+    """
+    repo = context.resource(mapping, 'repo')
+    ctx = context.resource(mapping, 'ctx')
+
+    def formatnode(ctx):
+        return ' %s (%s)' % (scmutil.formatchangeid(ctx), ctx.phasestr())
+
+    entries = obsutil.whyunstable(repo, ctx)
+
+    for entry in entries:
+        if entry.get('divergentnodes'):
+            dnodes = entry['divergentnodes']
+            entry['divergentnodes'] = ''.join(formatnode(dnode)
+                                              for dnode in dnodes)
+
+    tmpl = '{instability}:{divergentnodes} {reason} {node|short}'
+    return templateutil.mappinglist(entries, tmpl=tmpl, sep='\n')
+
 def loadkeyword(ui, extname, registrarobj):
     """Load template keyword from specified registrarobj
     """

tests/test-obsolete-divergent.t

@@ -721,6 +721,11 b' Use scmutil.cleanupnodes API to create d'
   $ hg debugwhyunstable 1a2a9b5b0030
   content-divergent: 70d5a63ca112acb3764bc1d7320ca90ea688d671 (draft) predecessor a178212c3433c4e77b573f6011e29affb8aefa33
 
+  $ hg log -r 1a2a9b5b0030 --hidden -T '{whyunstable}\n'
+  content-divergent: 4:70d5a63ca112 (draft) predecessor a178212c3433
+  $ hg log -r 1a2a9b5b0030 --hidden -T '{whyunstable%"{instability}:{divergentnodes} {reason} {node}\n"}'
+  content-divergent: 4:70d5a63ca112 (draft) predecessor a178212c3433c4e77b573f6011e29affb8aefa33
+
 #if serve
 
   $ hg serve -n test -p $HGPORT -d --pid-file=hg.pid -A access.log -E errors.log

tests/test-obsolete.t

@@ -1044,6 +1044,15 b' test debugwhyunstable output'
   orphan: obsolete parent 3de5eca88c00aa039da7399a220f4a5221faa585
   phase-divergent: immutable predecessor 245bde4270cd1072a27757984f9cda8ba26f08ca
 
+test whyunstable template keyword
+
+  $ hg log -r 50c51b361e60 -T '{whyunstable}\n'
+  orphan: obsolete parent 3de5eca88c00
+  phase-divergent: immutable predecessor 245bde4270cd
+  $ hg log -r 50c51b361e60 -T '{whyunstable%"{instability}: {reason} {node}\n"}'
+  orphan: obsolete parent 3de5eca88c00aa039da7399a220f4a5221faa585
+  phase-divergent: immutable predecessor 245bde4270cd1072a27757984f9cda8ba26f08ca
+
 #if serve
 
   $ hg serve -n test -p $HGPORT -d --pid-file=hg.pid -A access.log -E errors.log