Changes 'git diff --no-index $directory $file' behaviour.
Now it is transformed to 'git diff --no-index $directory/&file $file'
instead of throwing an error.

Signed-off-by: Yurii Shevtsov <ungetch <at> gmail.com>
---
 diff-no-index.c |   21 +++++++++++++++++++--
 1 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/diff-no-index.c b/diff-no-index.c
index 265709b..4e71b36 100644
--- a/diff-no-index.c
+++ b/diff-no-index.c
@@ -97,8 +97,25 @@ static int queue_diff(struct diff_options *o,
        if (get_mode(name1, &mode1) || get_mode(name2, &mode2))
                return -1;

-       if (mode1 && mode2 && S_ISDIR(mode1) != S_ISDIR(mode2))
-               return error("file/directory conflict: %s, %s", name1, name2);
+       if (mode1 && mode2 && S_ISDIR(mode1) != S_ISDIR(mode2)) {
+               struct strbuf dirnfile;
+               const char *dir, *file;
+               char *filename;
+               int ret = 0;
+
+               dir = S_ISDIR(mode1) ? name1 : name2;
+               file = (dir == name1) ? name2 : name1;
+               strbuf_init(&dirnfile, strlen(name1) + strlen(name2) + 2);
+               strbuf_addstr(&dirnfile, dir);
+               if (dirnfile.buf[dirnfile.len - 1] != '/')
+                       strbuf_addch(&dirnfile, '/');
+               filename = strrchr(file, '/');
+               strbuf_addstr(&dirnfile, filename ? (filename + 1) : file);
+               ret = queue_diff(o, dirnfile.buf, file);
+               strbuf_release(&dirnfile);
+
+               return ret;
+       }

        if (S_ISDIR(mode1) || S_ISDIR(mode2)) {
                struct strbuf buffer1 = STRBUF_INIT;
--

I hope I understood task correct. I think this patch requires writing
additional tests, so that's what I'm going to do now.
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