Tentative built-in format-patch.

This only does --stdout right now.  To write into separate files
with pretty-printed filenames like the real thing does, it needs
a bit mroe work.

Signed-off-by: Junio C Hamano <junkio@cox.net>

commit.c

@@ -36,6 +36,8 @@ enum cmit_fmt get_commit_format(const char *arg)
 		return CMIT_FMT_FULL;
 	if (!strcmp(arg, "=fuller"))
 		return CMIT_FMT_FULLER;
+	if (!strcmp(arg, "=email"))
+		return CMIT_FMT_EMAIL;
 	if (!strcmp(arg, "=oneline"))
 		return CMIT_FMT_ONELINE;
 	die("invalid --pretty format");
@@ -428,6 +430,10 @@ static int add_user_info(const char *what, enum cmit_fmt fmt, char *buf, const c
 	time = strtoul(date, &date, 10);
 	tz = strtol(date, NULL, 10);
 
+	if (fmt == CMIT_FMT_EMAIL) {
+		what = "From";
+		filler = "";
+	}
 	ret = sprintf(buf, "%s: %.*s%.*s\n", what,
 		      (fmt == CMIT_FMT_FULLER) ? 4 : 0,
 		      filler, namelen, line);
@@ -435,6 +441,9 @@ static int add_user_info(const char *what, enum cmit_fmt fmt, char *buf, const c
 	case CMIT_FMT_MEDIUM:
 		ret += sprintf(buf + ret, "Date:   %s\n", show_date(time, tz));
 		break;
+	case CMIT_FMT_EMAIL:
+		ret += sprintf(buf + ret, "Date: %s\n", show_date(time, tz));
+		break;
 	case CMIT_FMT_FULLER:
 		ret += sprintf(buf + ret, "%sDate: %s\n", what, show_date(time, tz));
 		break;
@@ -445,10 +454,12 @@ static int add_user_info(const char *what, enum cmit_fmt fmt, char *buf, const c
 	return ret;
 }
 
-static int is_empty_line(const char *line, int len)
+static int is_empty_line(const char *line, int *len_p)
 {
+	int len = *len_p;
 	while (len && isspace(line[len-1]))
 		len--;
+	*len_p = len;
 	return !len;
 }
 
@@ -457,7 +468,8 @@ static int add_merge_info(enum cmit_fmt fmt, char *buf, const struct commit *com
 	struct commit_list *parent = commit->parents;
 	int offset;
 
-	if ((fmt == CMIT_FMT_ONELINE) || !parent || !parent->next)
+	if ((fmt == CMIT_FMT_ONELINE) || (fmt == CMIT_FMT_EMAIL) ||
+	    !parent || !parent->next)
 		return 0;
 
 	offset = sprintf(buf, "Merge:");
@@ -480,9 +492,15 @@ unsigned long pretty_print_commit(enum cmit_fmt fmt, const struct commit *commit
 {
 	int hdr = 1, body = 0;
 	unsigned long offset = 0;
-	int indent = (fmt == CMIT_FMT_ONELINE) ? 0 : 4;
+	int indent = 4;
 	int parents_shown = 0;
 	const char *msg = commit->buffer;
+	const char *subject = NULL;
+
+	if (fmt == CMIT_FMT_EMAIL)
+		subject = "Subject: ";
+	if (fmt == CMIT_FMT_ONELINE || fmt == CMIT_FMT_EMAIL)
+		indent = 0;
 
 	for (;;) {
 		const char *line = msg;
@@ -506,7 +524,7 @@ unsigned long pretty_print_commit(enum cmit_fmt fmt, const struct commit *commit
 		if (hdr) {
 			if (linelen == 1) {
 				hdr = 0;
-				if (fmt != CMIT_FMT_ONELINE)
+				if ((fmt != CMIT_FMT_ONELINE) && !subject)
 					buf[offset++] = '\n';
 				continue;
 			}
@@ -544,20 +562,28 @@ unsigned long pretty_print_commit(enum cmit_fmt fmt, const struct commit *commit
 			continue;
 		}
 
-		if (is_empty_line(line, linelen)) {
+		if (is_empty_line(line, &linelen)) {
 			if (!body)
 				continue;
+			if (subject)
+				continue;
 			if (fmt == CMIT_FMT_SHORT)
 				break;
 		} else {
 			body = 1;
 		}
 
+		if (subject) {
+			memcpy(buf + offset, subject, 9);
+			offset += 9;
+		}
 		memset(buf + offset, ' ', indent);
 		memcpy(buf + offset + indent, line, linelen);
 		offset += linelen + indent;
+		buf[offset++] = '\n';
 		if (fmt == CMIT_FMT_ONELINE)
 			break;
+		subject = NULL;
 	}
 	while (offset && isspace(buf[offset-1]))
 		offset--;

commit.h

@@ -45,6 +45,7 @@ enum cmit_fmt {
 	CMIT_FMT_FULL,
 	CMIT_FMT_FULLER,
 	CMIT_FMT_ONELINE,
+	CMIT_FMT_EMAIL,
 
 	CMIT_FMT_UNSPECIFIED,
 };

git.c

@@ -276,6 +276,43 @@ static int cmd_help(int argc, const char **argv, char **envp)
 	return 0;
 }
 
+static int cmd_format_patch(int argc, const char **argv, char **envp)
+{
+	struct commit *commit;
+	struct commit **list = NULL;
+	struct rev_info rev;
+	int nr = 0;
+
+	init_revisions(&rev);
+	rev.commit_format = CMIT_FMT_EMAIL;
+	rev.verbose_header = 1;
+	rev.diff = 1;
+	rev.diffopt.with_raw = 0;
+	rev.diffopt.with_stat = 1;
+	rev.combine_merges = 0;
+	rev.ignore_merges = 1;
+	rev.diffopt.output_format = DIFF_FORMAT_PATCH;
+	argc = setup_revisions(argc, argv, &rev, "HEAD");
+
+	prepare_revision_walk(&rev);
+	while ((commit = get_revision(&rev)) != NULL) {
+		nr++;
+		list = realloc(list, nr * sizeof(list[0]));
+		list[nr - 1] = commit;
+	}
+	while (0 <= --nr) {
+		int shown;
+		commit = list[nr];
+		shown = log_tree_commit(&rev, commit);
+		free(commit->buffer);
+		commit->buffer = NULL;
+		if (shown)
+			printf("-- \n%s\n\n", GIT_VERSION);
+	}
+	free(list);
+	return 0;
+}
+
 static int cmd_log_wc(int argc, const char **argv, char **envp,
 		      struct rev_info *rev)
 {
@@ -348,6 +385,7 @@ static void handle_internal_command(int argc, const char **argv, char **envp)
 		{ "log", cmd_log },
 		{ "whatchanged", cmd_wc },
 		{ "show", cmd_show },
+		{ "format-patch", cmd_format_patch },
 	};
 	int i;
 

log-tree.c

@@ -37,12 +37,20 @@ void show_log(struct rev_info *opt, struct log_info *log, const char *sep)
 	/*
 	 * Print header line of header..
 	 */
+
+	if (opt->commit_format == CMIT_FMT_EMAIL)
+		printf("From %s  Thu Apr 7 15:13:13 2005\n",
+		       sha1_to_hex(commit->object.sha1));
+	else {
 		printf("%s%s",
 		       opt->commit_format == CMIT_FMT_ONELINE ? "" : "commit ",
 		       diff_unique_abbrev(commit->object.sha1, abbrev_commit));
 		if (parent) 
-		printf(" (from %s)", diff_unique_abbrev(parent->object.sha1, abbrev_commit));
+			printf(" (from %s)",
+			       diff_unique_abbrev(parent->object.sha1,
+						  abbrev_commit));
 		putchar(opt->commit_format == CMIT_FMT_ONELINE ? ' ' : '\n');
+	}
 
 	/*
 	 * And then the pretty-printed message itself
@@ -152,15 +160,18 @@ static int log_tree_diff(struct rev_info *opt, struct commit *commit, struct log
 int log_tree_commit(struct rev_info *opt, struct commit *commit)
 {
 	struct log_info log;
+	int shown;
 
 	log.commit = commit;
 	log.parent = NULL;
 	opt->loginfo = &log;
 
-	if (!log_tree_diff(opt, commit, &log) && opt->loginfo && opt->always_show_header) {
+	shown = log_tree_diff(opt, commit, &log);
+	if (!shown && opt->loginfo && opt->always_show_header) {
 		log.parent = NULL;
 		show_log(opt, opt->loginfo, "");
+		shown = 1;
 	}
 	opt->loginfo = NULL;
-	return 0;
+	return shown;
 }