checkout: Use remote refspecs when DWIMming tracking branches

diff --git a/diff.c b/diff.c
index 052974eb9729cca92c9e86be6e71f46052bcb788..f0b3e7cfe34a99c0e5fea85fcd00ec54e9b578d8 100644 (file)
--- a/diff.c
+++ b/diff.c
@@ -1264,6 +1264,7 @@ static char *pprint_rename(const char *a, const char *b)
        const char *new = b;
        struct strbuf name = STRBUF_INIT;
        int pfx_length, sfx_length;
+       int pfx_adjust_for_slash;
        int len_a = strlen(a);
        int len_b = strlen(b);
        int a_midlen, b_midlen;
@@ -1290,7 +1291,18 @@ static char *pprint_rename(const char *a, const char *b)
        old = a + len_a;
        new = b + len_b;
        sfx_length = 0;
-       while (a <= old && b <= new && *old == *new) {
+       /*
+        * If there is a common prefix, it must end in a slash.  In
+        * that case we let this loop run 1 into the prefix to see the
+        * same slash.
+        *
+        * If there is no common prefix, we cannot do this as it would
+        * underrun the input strings.
+        */
+       pfx_adjust_for_slash = (pfx_length ? 1 : 0);
+       while (a + pfx_length - pfx_adjust_for_slash <= old &&
+              b + pfx_length - pfx_adjust_for_slash <= new &&
+              *old == *new) {
                if (*old == '/')
                        sfx_length = len_a - (old - a);
                old--;
@@ -1553,7 +1565,7 @@ static void show_stats(struct diffstat_t *data, struct diff_options *options)
         * Binary files are displayed with "Bin XXX -> YYY bytes"
         * instead of the change count and graph. This part is treated
         * similarly to the graph part, except that it is not
-        * "scaled". If total width is too small to accomodate the
+        * "scaled". If total width is too small to accommodate the
         * guaranteed minimum width of the filename part and the
         * separators and this message, this message will "overflow"
         * making the line longer than the maximum width.
@@ -2243,6 +2255,7 @@ static void builtin_diff(const char *name_a,
                const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
                const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
                show_submodule_summary(o->file, one ? one->path : two->path,
+                               line_prefix,
                                one->sha1, two->sha1, two->dirty_submodule,
                                meta, del, add, reset);
                return;
@@ -3584,8 +3597,8 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac)
                options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
        else if (!strcmp(arg, "--histogram"))
                options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
-       else if (!prefixcmp(arg, "--diff-algorithm=")) {
-               long value = parse_algorithm_value(arg+17);
+       else if ((argcount = parse_long_opt("diff-algorithm", av, &optarg))) {
+               long value = parse_algorithm_value(optarg);
                if (value < 0)
                        return error("option diff-algorithm accepts \"myers\", "
                                     "\"minimal\", \"patience\" and \"histogram\"");
@@ -3593,6 +3606,7 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac)
                DIFF_XDL_CLR(options, NEED_MINIMAL);
                options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
                options->xdl_opts |= value;
+               return argcount;
        }
 
        /* flags options */