diff --follow: do not waste cycles while recursing

diff --git a/diff.c b/diff.c
index 2327cea5b2c9ebe8d545b5a648910077ee67cd64..bf65892f78f84a31b6bf87b0f82cfc5938485862 100644 (file)
--- a/diff.c
+++ b/diff.c
@@ -44,10 +44,6 @@ static char diff_colors[][COLOR_MAXLEN] = {
        GIT_COLOR_NORMAL,       /* FUNCINFO */
 };
 
-static void diff_filespec_load_driver(struct diff_filespec *one);
-static size_t fill_textconv(struct userdiff_driver *driver,
-                           struct diff_filespec *df, char **outbuf);
-
 static int parse_diff_color_slot(const char *var, int ofs)
 {
        if (!strcasecmp(var+ofs, "plain"))
@@ -1810,7 +1806,7 @@ void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const
                options->b_prefix = b;
 }
 
-static struct userdiff_driver *get_textconv(struct diff_filespec *one)
+struct userdiff_driver *get_textconv(struct diff_filespec *one)
 {
        if (!DIFF_FILE_VALID(one))
                return NULL;
@@ -2620,7 +2616,6 @@ static void fill_metainfo(struct strbuf *msg,
                }
                /* fallthru */
        default:
-               /* nothing */
                *must_show_header = 0;
        }
        if (one && two && hashcmp(one->sha1, two->sha1)) {
@@ -2632,8 +2627,7 @@ static void fill_metainfo(struct strbuf *msg,
                            (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
                                abbrev = 40;
                }
-               strbuf_addf(msg, "%s%sindex %s..", set,
-                           line_prefix,
+               strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
                            find_unique_abbrev(one->sha1, abbrev));
                strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
                if (one->mode == two->mode)
@@ -2710,10 +2704,16 @@ static void diff_fill_sha1_info(struct diff_filespec *one)
 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
 {
        /* Strip the prefix but do not molest /dev/null and absolute paths */
-       if (*namep && **namep != '/')
+       if (*namep && **namep != '/') {
                *namep += prefix_length;
-       if (*otherp && **otherp != '/')
+               if (**namep == '/')
+                       ++*namep;
+       }
+       if (*otherp && **otherp != '/') {
                *otherp += prefix_length;
+               if (**otherp == '/')
+                       ++*otherp;
+       }
 }
 
 static void run_diff(struct diff_filepair *p, struct diff_options *o)
@@ -2820,7 +2820,6 @@ static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
 void diff_setup(struct diff_options *options)
 {
        memset(options, 0, sizeof(*options));
-       memset(&diff_queued_diff, 0, sizeof(diff_queued_diff));
 
        options->file = stdout;
 
@@ -3173,7 +3172,9 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac)
        else if (!strcmp(arg, "--no-textconv"))
                DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
        else if (!strcmp(arg, "--ignore-submodules"))
-               DIFF_OPT_SET(options, IGNORE_SUBMODULES);
+               handle_ignore_submodules_arg(options, "all");
+       else if (!prefixcmp(arg, "--ignore-submodules="))
+               handle_ignore_submodules_arg(options, arg + 20);
        else if (!strcmp(arg, "--submodule"))
                DIFF_OPT_SET(options, SUBMODULE_LOG);
        else if (!prefixcmp(arg, "--submodule=")) {
@@ -4244,9 +4245,9 @@ static char *run_textconv(const char *pgm, struct diff_filespec *spec,
        return strbuf_detach(&buf, outsize);
 }
 
-static size_t fill_textconv(struct userdiff_driver *driver,
-                           struct diff_filespec *df,
-                           char **outbuf)
+size_t fill_textconv(struct userdiff_driver *driver,
+                    struct diff_filespec *df,
+                    char **outbuf)
 {
        size_t size;