range-diff: add filename to inner diff

diff --git a/range-diff.c b/range-diff.c
index 5f64380fe4d0597ac271ab2ab38da26ee0841291..7a96a587f1f378ce25c2d1dc1491ec841e276e99 100644 (file)
--- a/range-diff.c
+++ b/range-diff.c
@@ -46,7 +46,7 @@ static int read_patches(const char *range, struct string_list *list)
        struct strbuf buf = STRBUF_INIT, contents = STRBUF_INIT;
        struct patch_util *util = NULL;
        int in_header = 1;
-       char *line;
+       char *line, *current_filename = NULL;
        int offset, len;
        size_t size;
 
@@ -125,6 +125,12 @@ static int read_patches(const char *range, struct string_list *list)
                        else
                                strbuf_addstr(&buf, patch.new_name);
 
+                       free(current_filename);
+                       if (patch.is_delete > 0)
+                               current_filename = xstrdup(patch.old_name);
+                       else
+                               current_filename = xstrdup(patch.new_name);
+
                        if (patch.new_mode && patch.old_mode &&
                            patch.old_mode != patch.new_mode)
                                strbuf_addf(&buf, " (mode change %06o => %06o)",
@@ -145,7 +151,11 @@ static int read_patches(const char *range, struct string_list *list)
                        continue;
                } else if (skip_prefix(line, "@@ ", &p)) {
                        p = strstr(p, "@@");
-                       strbuf_addstr(&buf, p ? p : "@@");
+                       strbuf_addstr(&buf, "@@");
+                       if (current_filename && p[2])
+                               strbuf_addf(&buf, " %s:", current_filename);
+                       if (p)
+                               strbuf_addstr(&buf, p + 2);
                } else if (!line[0])
                        /*
                         * A completely blank (not ' \n', which is context)
@@ -177,6 +187,7 @@ static int read_patches(const char *range, struct string_list *list)
        if (util)
                string_list_append(list, buf.buf)->util = util;
        strbuf_release(&buf);
+       free(current_filename);
 
        if (finish_command(&cp))
                return -1;