diff-no-index: DWIM "diff D F" into "diff D/F F"

diff --git a/diff-no-index.c b/diff-no-index.c
index 265709ba8c51a4390fad11c7d1aa23551a4fd266..49c4536d1d2bee8ffe463966e8783f0195562738 100644 (file)
--- a/diff-no-index.c
+++ b/diff-no-index.c
@@ -182,12 +182,50 @@ static int queue_diff(struct diff_options *o,
        }
 }
 
+/* append basename of F to D */
+static void append_basename(struct strbuf *path, const char *dir, const char *file)
+{
+       const char *tail = strrchr(file, '/');
+
+       strbuf_addstr(path, dir);
+       while (path->len && path->buf[path->len - 1] == '/')
+               path->len--;
+       strbuf_addch(path, '/');
+       strbuf_addstr(path, tail ? tail + 1 : file);
+}
+
+/*
+ * DWIM "diff D F" into "diff D/F F" and "diff F D" into "diff F D/F"
+ * Note that we append the basename of F to D/, so "diff a/b/file D"
+ * becomes "diff a/b/file D/file", not "diff a/b/file D/a/b/file".
+ */
+static void fixup_paths(const char **path, struct strbuf *replacement)
+{
+       unsigned int isdir0, isdir1;
+
+       if (path[0] == file_from_standard_input ||
+           path[1] == file_from_standard_input)
+               return;
+       isdir0 = is_directory(path[0]);
+       isdir1 = is_directory(path[1]);
+       if (isdir0 == isdir1)
+               return;
+       if (isdir0) {
+               append_basename(replacement, path[0], path[1]);
+               path[0] = replacement->buf;
+       } else {
+               append_basename(replacement, path[1], path[0]);
+               path[1] = replacement->buf;
+       }
+}
+
 void diff_no_index(struct rev_info *revs,
                   int argc, const char **argv,
                   const char *prefix)
 {
        int i, prefixlen;
        const char *paths[2];
+       struct strbuf replacement = STRBUF_INIT;
 
        diff_setup(&revs->diffopt);
        for (i = 1; i < argc - 2; ) {
@@ -217,6 +255,9 @@ void diff_no_index(struct rev_info *revs,
                        p = xstrdup(prefix_filename(prefix, prefixlen, p));
                paths[i] = p;
        }
+
+       fixup_paths(paths, &replacement);
+
        revs->diffopt.skip_stat_unmatch = 1;
        if (!revs->diffopt.output_format)
                revs->diffopt.output_format = DIFF_FORMAT_PATCH;
@@ -235,6 +276,8 @@ void diff_no_index(struct rev_info *revs,
        diffcore_std(&revs->diffopt);
        diff_flush(&revs->diffopt);
 
+       strbuf_release(&replacement);
+
        /*
         * The return code for --no-index imitates diff(1):
         * 0 = no changes, 1 = changes, else error