git-apply: make the diffstat output happen for "--stat" only.

Slowly this is takign the form of a program that we'd actually
use. Now "git-apply --stat" basically ends up being a perfectly
useful diffstat.

diff --git a/apply.c b/apply.c
index 3c3ec90..36edd07 100644 (file)
--- a/apply.c
+++ b/apply.c
@@ -19,6 +19,8 @@
 // We default to the merge behaviour, since that's what most people would
 // expect
 static int merge_patch = 1;
+static int diffstat = 0;
+static int check = 1;
 static const char apply_usage[] = "git-apply <patch>";
 
 /*
@@ -384,9 +386,19 @@ static int parse_git_header(char *line, int len, unsigned int size, struct patch
        return offset;
 }
 
-static int parse_num(const char *line, int len, int offset, const char *expect, unsigned long *p)
+static int parse_num(const char *line, unsigned long *p)
 {
        char *ptr;
+
+       if (!isdigit(*line))
+               return 0;
+       *p = strtoul(line, &ptr, 10);
+       return ptr - line;
+}
+
+static int parse_range(const char *line, int len, int offset, const char *expect,
+                       unsigned long *p1, unsigned long *p2)
+{
        int digits, ex;
 
        if (offset < 0 || offset >= len)
@@ -394,16 +406,25 @@ static int parse_num(const char *line, int len, int offset, const char *expect,
        line += offset;
        len -= offset;
 
-       if (!isdigit(*line))
+       digits = parse_num(line, p1);
+       if (!digits)
                return -1;
-       *p = strtoul(line, &ptr, 10);
-
-       digits = ptr - line;
 
        offset += digits;
        line += digits;
        len -= digits;
 
+       *p2 = *p1;
+       if (*line == ',') {
+               digits = parse_num(line+1, p2);
+               if (!digits)
+                       return -1;
+
+               offset += digits+1;
+               line += digits+1;
+               len -= digits+1;
+       }
+
        ex = strlen(expect);
        if (ex > len)
                return -1;
@@ -425,10 +446,8 @@ static int parse_fragment_header(char *line, int len, struct fragment *fragment)
                return -1;
 
        /* Figure out the number of lines in a fragment */
-       offset = parse_num(line, len, 4, ",", &fragment->oldpos);
-       offset = parse_num(line, len, offset, " +", &fragment->oldlines);
-       offset = parse_num(line, len, offset, ",", &fragment->newpos);
-       offset = parse_num(line, len, offset, " @@", &fragment->newlines);
+       offset = parse_range(line, len, 4, " +", &fragment->oldpos, &fragment->oldlines);
+       offset = parse_range(line, len, offset, " @@", &fragment->newpos, &fragment->newlines);
 
        return offset;
 }
@@ -552,6 +571,9 @@ static int parse_fragment(char *line, unsigned long size, struct patch *patch, s
                        added++;
                        newlines--;
                        break;
+               /* We allow "\ No newline at end of file" */
+               case '\\':
+                       break;
                }
        }
        patch->lines_added += added;
@@ -608,8 +630,11 @@ static void show_stats(struct patch *patch)
        char *name = patch->old_name;
        int len, max, add, del;
 
-       if (!name)
+       if (!name) {
                name = patch->new_name;
+               if (!name)
+                       return;
+       }
 
        /*
         * "scale" the filename
@@ -636,6 +661,23 @@ static void show_stats(struct patch *patch)
                add, pluses, del, minuses);
 }
 
+static void check_patch(struct patch *patch)
+{
+       const char *old_name = patch->old_name;
+       const char *new_name = patch->new_name;
+
+       if (old_name) {
+               if (cache_name_pos(old_name, strlen(old_name)) < 0)
+                       die("file %s does not exist", old_name);
+               if (patch->is_new < 0)
+                       patch->is_new = 0;
+       }
+       if (new_name && (patch->is_new | patch->is_rename | patch->is_copy)) {
+               if (cache_name_pos(new_name, strlen(new_name)) >= 0)
+                       die("file %s already exists", new_name);
+       }
+}
+
 static void apply_patch_list(struct patch *patch)
 {
        int files, adds, dels;
@@ -644,26 +686,19 @@ static void apply_patch_list(struct patch *patch)
        if (!patch)
                die("no patch found");
        do {
-               const char *old_name = patch->old_name;
-               const char *new_name = patch->new_name;
-
-               if (old_name) {
-                       if (cache_name_pos(old_name, strlen(old_name)) < 0)
-                               die("file %s does not exist", old_name);
-                       if (patch->is_new < 0)
-                               patch->is_new = 0;
+               if (check)
+                       check_patch(patch);
+
+               if (diffstat) {
+                       files++;
+                       adds += patch->lines_added;
+                       dels += patch->lines_deleted;
+                       show_stats(patch);
                }
-               if (new_name && (patch->is_new | patch->is_rename | patch->is_copy)) {
-                       if (cache_name_pos(new_name, strlen(new_name)) >= 0)
-                               die("file %s already exists", new_name);
-               }
-
-               files++;
-               adds += patch->lines_added;
-               dels += patch->lines_deleted;
-               show_stats(patch);
        } while ((patch = patch->next) != NULL);
-       printf(" %d files changed, %d insertions(+), %d deletions(-)\n", files, adds, dels);
+
+       if (diffstat)
+               printf(" %d files changed, %d insertions(+), %d deletions(-)\n", files, adds, dels);
 }
 
 static void patch_stats(struct patch *patch)
@@ -736,6 +771,11 @@ int main(int argc, char **argv)
                        merge_patch = 0;
                        continue;
                }
+               if (!strcmp(arg, "--stat")) {
+                       check = 0;
+                       diffstat = 1;
+                       continue;
+               }
                fd = open(arg, O_RDONLY);
                if (fd < 0)
                        usage(apply_usage);