# HG changeset patch
# User Michael Fyles <mf@vorston.net>
# Date 2012-07-26 10:38:13
# Node ID 72a89cf86fcd78dfa500031b5734147e6b830fbc
# Parent  7867f15b4a387a85c24cf614df478183da7525ea

extdiff: quote user-supplied options passed to shell

$ hg extdiff -p cmd -o "name <user@example.com>"
resulted in a shell redirection error (due to the less-than sign),
rather than passing the single option to cmd. This was due to options
not being quoted for passing to the shell, via util.system(). Apply
util.shellquote() to each of the user-specified options (-o) to the
comparison program before they are concatenated and passed to
util.system(). The requested external diff command (-p) and the
files/directories being compared are already quoted correctly.

The discussion at the time of changeset be98c5ce4022 correctly noted
that this course of action breaks whitespace-separated options specified
for external diff commands in the configuration. The lower part of the
patch corrects this by lexing options read from the configuration file
into separate options rather than reading them all into the first
option.

Update test to cover these conditions.

Related changesets (reverse-chronological):
- be98c5ce4022 (fix reverted to make configuration file options work)
- 453097750fbf (issue fixed but without fix for configuration file)

diff --git a/hgext/extdiff.py b/hgext/extdiff.py
--- a/hgext/extdiff.py
+++ b/hgext/extdiff.py
@@ -121,7 +121,7 @@ def dodiff(ui, repo, diffcmd, diffopts, 
 
     revs = opts.get('rev')
     change = opts.get('change')
-    args = ' '.join(diffopts)
+    args = ' '.join(map(util.shellquote, diffopts))
     do3way = '$parent2' in args
 
     if revs and change:
@@ -280,8 +280,7 @@ def uisetup(ui):
             cmd = cmd[4:]
             if not path:
                 path = cmd
-            diffopts = ui.config('extdiff', 'opts.' + cmd, '')
-            diffopts = diffopts and [diffopts] or []
+            diffopts = shlex.split(ui.config('extdiff', 'opts.' + cmd, ''))
         elif cmd.startswith('opts.'):
             continue
         else:
diff --git a/tests/test-extdiff.t b/tests/test-extdiff.t
--- a/tests/test-extdiff.t
+++ b/tests/test-extdiff.t
@@ -19,6 +19,8 @@ Should diff cloned directories:
   $ echo "[extdiff]" >> $HGRCPATH
   $ echo "cmd.falabala=echo" >> $HGRCPATH
   $ echo "opts.falabala=diffing" >> $HGRCPATH
+  $ echo "cmd.edspace=echo" >> $HGRCPATH
+  $ echo 'opts.edspace="name  <user@example.com>"' >> $HGRCPATH
 
   $ hg falabala
   diffing a.000000000000 a
@@ -168,6 +170,16 @@ Test extdiff with --option:
   diffing this */extdiff.*/a.8a5febb7f867/a a.34eed99112ab/a (glob)
   [1]
 
+Test extdiff's handling of options with spaces in them:
+
+  $ hg edspace -c 1
+  name  <user@example.com> */extdiff.*/a.8a5febb7f867/a a.34eed99112ab/a (glob)
+  [1]
+
+  $ hg extdiff -p echo -o "name  <user@example.com>" -c 1
+  name  <user@example.com> */extdiff.*/a.8a5febb7f867/a a.34eed99112ab/a (glob)
+  [1]
+
 Test with revsets:
 
   $ hg extdif -p echo -c "rev(1)"