X-Git-Url: https://git.verplant.org/?a=blobdiff_plain;f=diff-cache.c;h=899e37361e5d34a38e4746b3cd290d9b96a6c8f8;hb=db413479f1bb0dabfc613b2b0017ca74aeb5a919;hp=b407d753e520fa0b1523d770d98b3015af197275;hpb=b5af9107270171b79d46b099ee0b198e653f3a24;p=git.git

diff --git a/diff-cache.c b/diff-cache.c
index b407d753..899e3736 100644
--- a/diff-cache.c
+++ b/diff-cache.c
@@ -1,45 +1,82 @@
 #include "cache.h"
+#include "diff.h"
 
 static int cached_only = 0;
+static int generate_patch = 0;
 static int line_termination = '\n';
 
 /* A file entry went away or appeared */
-static void show_file(const char *prefix, struct cache_entry *ce)
+static void show_file(const char *prefix, struct cache_entry *ce, unsigned char *sha1, unsigned int mode)
 {
-	printf("%s%o\t%s\t%s\t%s%c", prefix, ntohl(ce->ce_mode), "blob",
-	       sha1_to_hex(ce->sha1), ce->name, line_termination);
+	if (generate_patch)
+		diff_addremove(prefix[0], ntohl(mode), sha1, ce->name, NULL);
+	else
+		printf("%s%06o\tblob\t%s\t%s%c", prefix, ntohl(mode),
+		       sha1_to_hex(sha1), ce->name, line_termination);
 }
 
-static int show_modified(struct cache_entry *old, struct cache_entry *new)
+static int get_stat_data(struct cache_entry *ce, unsigned char **sha1p, unsigned int *modep)
 {
-	unsigned int mode = ntohl(new->ce_mode), oldmode;
-	unsigned char *sha1 = new->sha1;
-	unsigned char old_sha1_hex[60];
+	unsigned char *sha1 = ce->sha1;
+	unsigned int mode = ce->ce_mode;
 
 	if (!cached_only) {
 		static unsigned char no_sha1[20];
 		int changed;
 		struct stat st;
-		if (stat(new->name, &st) < 0) {
-			show_file("-", old);
+		if (stat(ce->name, &st) < 0)
 			return -1;
-		}
-		changed = cache_match_stat(new, &st);
+		changed = cache_match_stat(ce, &st);
 		if (changed) {
-			mode = st.st_mode;
+			mode = create_ce_mode(st.st_mode);
 			sha1 = no_sha1;
 		}
 	}
 
-	oldmode = ntohl(old->ce_mode);
+	*sha1p = sha1;
+	*modep = mode;
+	return 0;
+}
+
+static void show_new_file(struct cache_entry *new)
+{
+	unsigned char *sha1;
+	unsigned int mode;
+
+	/* New file in the index: it might actually be different in the working copy */
+	if (get_stat_data(new, &sha1, &mode) < 0)
+		return;
+
+	show_file("+", new, sha1, mode);
+}
+
+static int show_modified(struct cache_entry *old, struct cache_entry *new)
+{
+	unsigned int mode, oldmode;
+	unsigned char *sha1;
+	unsigned char old_sha1_hex[60];
+
+	if (get_stat_data(new, &sha1, &mode) < 0) {
+		show_file("-", old, old->sha1, old->ce_mode);
+		return -1;
+	}
+
+	oldmode = old->ce_mode;
 	if (mode == oldmode && !memcmp(sha1, old->sha1, 20))
 		return 0;
 
-	strcpy(old_sha1_hex, sha1_to_hex(old->sha1));
-	printf("*%o->%o\t%s\t%s->%s\t%s%c", oldmode, mode,
-	       "blob",
-	       old_sha1_hex, sha1_to_hex(sha1),
-	       old->name, line_termination);
+	mode = ntohl(mode);
+	oldmode = ntohl(oldmode);
+
+	if (generate_patch)
+		diff_change(oldmode, mode,
+			    old->sha1, sha1, old->name, NULL);
+	else {
+		strcpy(old_sha1_hex, sha1_to_hex(old->sha1));
+		printf("*%06o->%06o\tblob\t%s->%s\t%s%c", oldmode, mode,
+		       old_sha1_hex, sha1_to_hex(sha1),
+		       old->name, line_termination);
+	}
 	return 0;
 }
 
@@ -47,45 +84,66 @@ static int diff_cache(struct cache_entry **ac, int entries)
 {
 	while (entries) {
 		struct cache_entry *ce = *ac;
+		int same = (entries > 1) && same_name(ce, ac[1]);
 
-		/* No matching 0-stage (current) entry? Show it as deleted */
-		if (ce_stage(ce)) {
-			show_file("-", ce);
-			ac++;
-			entries--;
-			continue;
+		switch (ce_stage(ce)) {
+		case 0:
+			/* No stage 1 entry? That means it's a new file */
+			if (!same) {
+				show_new_file(ce);
+				break;
+			}
+			/* Show difference between old and new */
+			show_modified(ac[1], ce);
+			break;
+		case 1:
+			/* No stage 3 (merge) entry? That means it's been deleted */
+			if (!same) {
+				show_file("-", ce, ce->sha1, ce->ce_mode);
+				break;
+			}
+			/* Otherwise we fall through to the "unmerged" case */
+		case 3:
+			if (generate_patch)
+				diff_unmerge(ce->name);
+			else
+				printf("U %s%c", ce->name, line_termination);
+			break;
+
+		default:
+			die("impossible cache entry stage");
 		}
-		/* No matching 1-stage (tree) entry? Show the current one as added */
-		if (entries == 1 || !same_name(ce, ac[1])) {
-			show_file("-", ce);
+
+		/*
+		 * Ignore all the different stages for this file,
+		 * we've handled the relevant cases now.
+		 */
+		do {
 			ac++;
 			entries--;
-			continue;
-		}
-		show_modified(ac[1], ce);
-		ac += 2;
-		entries -= 2;
-		continue;
+		} while (entries && same_name(ce, ac[0]));
 	}
 	return 0;
 }
 
-static void remove_merge_entries(void)
+/*
+ * This turns all merge entries into "stage 3". That guarantees that
+ * when we read in the new tree (into "stage 1"), we won't lose sight
+ * of the fact that we had unmerged entries.
+ */
+static void mark_merge_entries(void)
 {
 	int i;
 	for (i = 0; i < active_nr; i++) {
 		struct cache_entry *ce = active_cache[i];
 		if (!ce_stage(ce))
-			break;
-		printf("%s: unmerged\n", ce->name);
-		while (remove_entry_at(i)) {
-			if (!ce_stage(active_cache[i]))
-				break;
-		}
+			continue;
+		ce->ce_flags |= htons(CE_STAGEMASK);
 	}
 }
 
-static char *diff_cache_usage = "diff-cache [-r] [-z] [--cached] <tree sha1>";
+static char *diff_cache_usage =
+"diff-cache [-r] [-z] [-p] [--cached] <tree sha1>";
 
 int main(int argc, char **argv)
 {
@@ -102,6 +160,10 @@ int main(int argc, char **argv)
 			/* We accept the -r flag just to look like diff-tree */
 			continue;
 		}
+		if (!strcmp(arg, "-p")) {
+			generate_patch = 1;
+			continue;
+		}
 		if (!strcmp(arg, "-z")) {
 			line_termination = '\0';
 			continue;
@@ -116,9 +178,9 @@ int main(int argc, char **argv)
 	if (argc != 2 || get_sha1_hex(argv[1], tree_sha1))
 		usage(diff_cache_usage);
 
-	remove_merge_entries();
+	mark_merge_entries();
 
-	tree = read_tree_with_tree_or_commit_sha1(tree_sha1, &size, 0);
+	tree = read_object_with_reference(tree_sha1, "tree", &size, 0);
 	if (!tree)
 		die("bad tree object %s", argv[1]);
 	if (read_tree(tree, size, 1))