[PATCH 1 of 2] revset: add descs() function which searches for individual words

[Alexander Plavin]

# HG changeset patch
# User Alexander Plavin <alexander at plav.in>
# Date 1375736748 -14400
#      Tue Aug 06 01:05:48 2013 +0400
# Node ID bac960d92a8f2d6fd2f833ab041ffe386c76967d
# Parent  ecb8e32e765eaf8e2df8d6535be6ca66275ca0df
revset: add descs() function which searches for individual words

This function provides a more convenient way to express a conjunction of
multiple desc() calls.

diff -r ecb8e32e765e -r bac960d92a8f mercurial/revset.py
--- a/mercurial/revset.py	Tue Aug 06 00:52:06 2013 +0400
+++ b/mercurial/revset.py	Tue Aug 06 01:05:48 2013 +0400
@@ -589,6 +589,22 @@
             l.append(r)
     return l
 
+def descs(repo, subset, x):
+    """``descs(string)``
+    Search commit message for all individual words from the string.
+    Equivalent to a conjunction of multiple desc() calls.
+    The match is case-insensitive.
+    """
+    # i18n: "descs" is a keyword
+    dses = encoding.lower(getstring(x, _("descs requires a string"))).split()
+    l = []
+    for r in subset:
+        c = repo[r]
+        if util.all(ds in encoding.lower(c.description())
+                    for ds in dses):
+            l.append(r)
+    return l
+
 def _descendants(repo, subset, x, followfirst=False):
     args = getset(repo, list(repo), x)
     if not args:
@@ -1551,6 +1567,7 @@
     "converted": converted,
     "date": date,
     "desc": desc,
+    "descs": descs,
     "descendants": descendants,
     "_firstdescendants": _firstdescendants,
     "destination": destination,
diff -r ecb8e32e765e -r bac960d92a8f tests/test-revset.t
--- a/tests/test-revset.t	Tue Aug 06 00:52:06 2013 +0400
+++ b/tests/test-revset.t	Tue Aug 06 01:05:48 2013 +0400
@@ -329,6 +329,8 @@
   $ log 'keyword(issue)'
   6
   $ log 'keyword("test a")'
+  $ log 'descs("0 1")'
+  9
   $ log 'limit(head(), 1)'
   0
   $ log 'matching(6)'