[PATCH] issue #3071: allow built-in diff to be specified as diff-cmd

This is my first attempt to change svn; so please tell me if I did anything
not-up-to-snuff. I would love to snuff-up.

(BTW, I made this patch with my svn built with this change applied, which
felt a lot better than running an external program that I'm *pretty sure*
has the same semantics...)

-Dan Bentley

P.S. One potential objection I could imagine is that this breaks parallelism
with other options in the "[helpers]" section. Should I expand the scope of
this patch to fix up every such use of editor-cmd and diff3-cmd as well?

[[[
Fix issue #3071: enhancement to svn diff to indicate that an external
diff-cmd should NOT be used

* subversion/libsvn_client/diff.c
  (diff_content_changed): Changed to use "" to mean "use built-in diff".
This allows a default in config to be overridden on command line.

* subversion/svn/main.c:
  (svn_cl__options): Document new meaning of empty string in diff-cmd
option.

Patch by: Dan Bentley <subversion_at_danbentley.com>
]]]

Index: subversion/libsvn_client/diff.c
===================================================================
--- subversion/libsvn_client/diff.c (revision 29979)
+++ subversion/libsvn_client/diff.c (working copy)
@@ -566,10 +566,12 @@
                                        SVN_CONFIG_CATEGORY_CONFIG,
                                        APR_HASH_KEY_STRING);
       svn_config_get(cfg, &diff_cmd, SVN_CONFIG_SECTION_HELPERS,
- SVN_CONFIG_OPTION_DIFF_CMD, NULL);
+ SVN_CONFIG_OPTION_DIFF_CMD, "");
     }

- if (diff_cmd)
+ /* "" means use internal diff so that an option in a config file can be
+ overridden by a command-line setting. */
+ if (strlen(diff_cmd))
     {
       /* Print out the diff header. */
       SVN_ERR(svn_stream_printf_from_utf8
Index: subversion/svn/main.c
===================================================================
--- subversion/svn/main.c (revision 29979)
+++ subversion/svn/main.c (working copy)
@@ -211,7 +211,8 @@
   {"ignore-externals", opt_ignore_externals, 0,
                     N_("ignore externals definitions")},
 #ifndef AS400
- {"diff-cmd", opt_diff_cmd, 1, N_("use ARG as diff command")},
+ {"diff-cmd", opt_diff_cmd, 1, N_("use ARG as diff command ('' for "
+ "built-in diff)")},
   {"diff3-cmd", opt_merge_cmd, 1, N_("use ARG as merge command")},
   {"editor-cmd", opt_editor_cmd, 1, N_("use ARG as external editor")},
 #endif

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