Revert "Merge branch 'jc/patch-id' into maint-2.46"

This reverts commit 41c952ebacf7e3369e7bee721f768114d65e50c4,
reversing changes made to 712d970c0145b95ce655773e7cd1676f09dfd215.
Keeping a known breakage for now is better than introducing new
regression(s).

1 files changed, 21 insertions, 72 deletions

diff --git a/builtin/patch-id.c b/builtin/patch-id.c
index 35c1179f7e..d790ae6354 100644
--- a/builtin/patch-id.c
+++ b/builtin/patch-id.c
@@ -7,9 +7,10 @@
 #include "parse-options.h"
 #include "setup.h"
 
-static void flush_current_id(struct object_id *id, struct object_id *result)
+static void flush_current_id(int patchlen, struct object_id *id, struct object_id *result)
 {
-	printf("%s %s\n", oid_to_hex(result), oid_to_hex(id));
+	if (patchlen)
+		printf("%s %s\n", oid_to_hex(result), oid_to_hex(id));
 }
 
 static int remove_space(char *line)
@@ -59,27 +60,9 @@ static int scan_hunk_header(const char *p, int *p_before, int *p_after)
 	return 1;
 }
 
-/*
- * flag bits to control get_one_patchid()'s behaviour.
- *
- * STABLE/VERBATIM are given from the command line option as
- * --stable/--verbatim.  FIND_HEADER conveys the internal state
- * maintained by the caller to allow the function to avoid mistaking
- * lines of log message before seeing the "diff" part as the beginning
- * of the next patch.
- */
-enum {
-	GOPID_STABLE = (1<<0),		/* --stable */
-	GOPID_VERBATIM = (1<<1),	/* --verbatim */
-	GOPID_FIND_HEADER = (1<<2),	/* stop at the beginning of patch message */
-};
-
 static int get_one_patchid(struct object_id *next_oid, struct object_id *result,
-			   struct strbuf *line_buf, unsigned flags)
+			   struct strbuf *line_buf, int stable, int verbatim)
 {
-	int stable = flags & GOPID_STABLE;
-	int verbatim = flags & GOPID_VERBATIM;
-	int find_header = flags & GOPID_FIND_HEADER;
 	int patchlen = 0, found_next = 0;
 	int before = -1, after = -1;
 	int diff_is_binary = 0;
@@ -94,40 +77,24 @@ static int get_one_patchid(struct object_id *next_oid, struct object_id *result,
 		const char *p = line;
 		int len;
 
-		/*
-		 * The caller hasn't seen us find a patch header and
-		 * return to it, or we have started processing patch
-		 * and may encounter the beginning of the next patch.
-		 */
-		if (find_header) {
-			/*
-			 * If we see a line that begins with "<object name>",
-			 * "commit <object name>" or "From <object name>", it is
-			 * the beginning of a patch.  Return to the caller, as
-			 * we are done with the one we have been processing.
-			 */
-			if (skip_prefix(line, "commit ", &p))
-				;
-			else if (skip_prefix(line, "From ", &p))
-				;
-			if (!get_oid_hex(p, next_oid)) {
-				if (verbatim)
-					the_hash_algo->update_fn(&ctx, line, strlen(line));
-				found_next = 1;
-				break;
-			}
+		/* Possibly skip over the prefix added by "log" or "format-patch" */
+		if (!skip_prefix(line, "commit ", &p) &&
+		    !skip_prefix(line, "From ", &p) &&
+		    starts_with(line, "\\ ") && 12 < strlen(line)) {
+			if (verbatim)
+				the_hash_algo->update_fn(&ctx, line, strlen(line));
+			continue;
+		}
+
+		if (!get_oid_hex(p, next_oid)) {
+			found_next = 1;
+			break;
 		}
 
 		/* Ignore commit comments */
 		if (!patchlen && !starts_with(line, "diff "))
 			continue;
 
-		/*
-		 * We are past the commit log message.  Prepare to
-		 * stop at the beginning of the next patch header.
-		 */
-		find_header = 1;
-
 		/* Parsing diff header?  */
 		if (before == -1) {
 			if (starts_with(line, "GIT binary patch") ||
@@ -160,16 +127,6 @@ static int get_one_patchid(struct object_id *next_oid, struct object_id *result,
 				break;
 		}
 
-		/*
-		 * A hunk about an incomplete line may have this
-		 * marker at the end, which should just be ignored.
-		 */
-		if (starts_with(line, "\\ ") && 12 < strlen(line)) {
-			if (verbatim)
-				the_hash_algo->update_fn(&ctx, line, strlen(line));
-			continue;
-		}
-
 		if (diff_is_binary) {
 			if (starts_with(line, "diff ")) {
 				diff_is_binary = 0;
@@ -216,20 +173,17 @@ static int get_one_patchid(struct object_id *next_oid, struct object_id *result,
 	return patchlen;
 }
 
-static void generate_id_list(unsigned flags)
+static void generate_id_list(int stable, int verbatim)
 {
 	struct object_id oid, n, result;
 	int patchlen;
 	struct strbuf line_buf = STRBUF_INIT;
 
 	oidclr(&oid, the_repository->hash_algo);
-	flags |= GOPID_FIND_HEADER;
 	while (!feof(stdin)) {
-		patchlen = get_one_patchid(&n, &result, &line_buf, flags);
-		if (patchlen)
-			flush_current_id(&oid, &result);
+		patchlen = get_one_patchid(&n, &result, &line_buf, stable, verbatim);
+		flush_current_id(patchlen, &oid, &result);
 		oidcpy(&oid, &n);
-		flags &= ~GOPID_FIND_HEADER;
 	}
 	strbuf_release(&line_buf);
 }
@@ -265,7 +219,6 @@ int cmd_patch_id(int argc, const char **argv, const char *prefix)
 	/* if nothing is set, default to unstable */
 	struct patch_id_opts config = {0, 0};
 	int opts = 0;
-	unsigned flags = 0;
 	struct option builtin_patch_id_options[] = {
 		OPT_CMDMODE(0, "unstable", &opts,
 		    N_("use the unstable patch-id algorithm"), 1),
@@ -297,11 +250,7 @@ int cmd_patch_id(int argc, const char **argv, const char *prefix)
 	if (!the_hash_algo)
 		repo_set_hash_algo(the_repository, GIT_HASH_SHA1);
 
-	if (opts ? opts > 1 : config.stable)
-		flags |= GOPID_STABLE;
-	if (opts ? opts == 3 : config.verbatim)
-		flags |= GOPID_VERBATIM;
-	generate_id_list(flags);
-
+	generate_id_list(opts ? opts > 1 : config.stable,
+			 opts ? opts == 3 : config.verbatim);
 	return 0;
 }