trailer: have function to describe trailer layout

Create a function that, taking a string, describes the position of its
trailer block (if available) and the contents thereof, and make trailer
use it. This makes it easier for other Git components, in the future, to
interpret trailer blocks in the same way as trailer.

In a subsequent patch, another component will be made to use this.

Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 82 insertions, 36 deletions

diff --git a/trailer.c b/trailer.c
index 2faccd7e2f..11f0b9fb40 100644
--- a/trailer.c
+++ b/trailer.c
@@ -46,6 +46,8 @@ static LIST_HEAD(conf_head);
 
 static char *separators = ":";
 
+static int configured;
+
 #define TRAILER_ARG_STRING "$ARG"
 
 static const char *git_generated_prefixes[] = {
@@ -546,6 +548,17 @@ static int git_trailer_config(const char *conf_key, const char *value, void *cb)
 	return 0;
 }
 
+static void ensure_configured(void)
+{
+	if (configured)
+		return;
+
+	/* Default config must be setup first */
+	git_config(git_trailer_default_config, NULL);
+	git_config(git_trailer_config, NULL);
+	configured = 1;
+}
+
 static const char *token_from_item(struct arg_item *item, char *tok)
 {
 	if (item->conf.key)
@@ -875,59 +888,43 @@ static int process_input_file(FILE *outfile,
 			      const char *str,
 			      struct list_head *head)
 {
-	int patch_start, trailer_start, trailer_end;
+	struct trailer_info info;
 	struct strbuf tok = STRBUF_INIT;
 	struct strbuf val = STRBUF_INIT;
-	struct trailer_item *last = NULL;
-	struct strbuf *trailer, **trailer_lines, **ptr;
+	int i;
 
-	patch_start = find_patch_start(str);
-	trailer_end = find_trailer_end(str, patch_start);
-	trailer_start = find_trailer_start(str, trailer_end);
+	trailer_info_get(&info, str);
 
 	/* Print lines before the trailers as is */
-	fwrite(str, 1, trailer_start, outfile);
+	fwrite(str, 1, info.trailer_start - str, outfile);
 
-	if (!ends_with_blank_line(str, trailer_start))
+	if (!info.blank_line_before_trailer)
 		fprintf(outfile, "\n");
 
-	/* Parse trailer lines */
-	trailer_lines = strbuf_split_buf(str + trailer_start,
-					 trailer_end - trailer_start,
-					 '\n',
-					 0);
-	for (ptr = trailer_lines; *ptr; ptr++) {
+	for (i = 0; i < info.trailer_nr; i++) {
 		int separator_pos;
-		trailer = *ptr;
-		if (trailer->buf[0] == comment_line_char)
-			continue;
-		if (last && isspace(trailer->buf[0])) {
-			struct strbuf sb = STRBUF_INIT;
-			strbuf_addf(&sb, "%s\n%s", last->value, trailer->buf);
-			strbuf_strip_suffix(&sb, "\n");
-			free(last->value);
-			last->value = strbuf_detach(&sb, NULL);
+		char *trailer = info.trailers[i];
+		if (trailer[0] == comment_line_char)
 			continue;
-		}
-		separator_pos = find_separator(trailer->buf, separators);
+		separator_pos = find_separator(trailer, separators);
 		if (separator_pos >= 1) {
-			parse_trailer(&tok, &val, NULL, trailer->buf,
+			parse_trailer(&tok, &val, NULL, trailer,
 				      separator_pos);
-			last = add_trailer_item(head,
-						strbuf_detach(&tok, NULL),
-						strbuf_detach(&val, NULL));
+			add_trailer_item(head,
+					 strbuf_detach(&tok, NULL),
+					 strbuf_detach(&val, NULL));
 		} else {
-			strbuf_addbuf(&val, trailer);
+			strbuf_addstr(&val, trailer);
 			strbuf_strip_suffix(&val, "\n");
 			add_trailer_item(head,
 					 NULL,
 					 strbuf_detach(&val, NULL));
-			last = NULL;
 		}
 	}
-	strbuf_list_free(trailer_lines);
 
-	return trailer_end;
+	trailer_info_release(&info);
+
+	return info.trailer_end - str;
 }
 
 static void free_all(struct list_head *head)
@@ -978,9 +975,7 @@ void process_trailers(const char *file, int in_place, int trim_empty, struct str
 	int trailer_end;
 	FILE *outfile = stdout;
 
-	/* Default config must be setup first */
-	git_config(git_trailer_default_config, NULL);
-	git_config(git_trailer_config, NULL);
+	ensure_configured();
 
 	read_input_file(&sb, file);
 
@@ -1007,3 +1002,54 @@ void process_trailers(const char *file, int in_place, int trim_empty, struct str
 
 	strbuf_release(&sb);
 }
+
+void trailer_info_get(struct trailer_info *info, const char *str)
+{
+	int patch_start, trailer_end, trailer_start;
+	struct strbuf **trailer_lines, **ptr;
+	char **trailer_strings = NULL;
+	size_t nr = 0, alloc = 0;
+	char **last = NULL;
+
+	ensure_configured();
+
+	patch_start = find_patch_start(str);
+	trailer_end = find_trailer_end(str, patch_start);
+	trailer_start = find_trailer_start(str, trailer_end);
+
+	trailer_lines = strbuf_split_buf(str + trailer_start,
+					 trailer_end - trailer_start,
+					 '\n',
+					 0);
+	for (ptr = trailer_lines; *ptr; ptr++) {
+		if (last && isspace((*ptr)->buf[0])) {
+			struct strbuf sb = STRBUF_INIT;
+			strbuf_attach(&sb, *last, strlen(*last), strlen(*last));
+			strbuf_addbuf(&sb, *ptr);
+			*last = strbuf_detach(&sb, NULL);
+			continue;
+		}
+		ALLOC_GROW(trailer_strings, nr + 1, alloc);
+		trailer_strings[nr] = strbuf_detach(*ptr, NULL);
+		last = find_separator(trailer_strings[nr], separators) >= 1
+			? &trailer_strings[nr]
+			: NULL;
+		nr++;
+	}
+	strbuf_list_free(trailer_lines);
+
+	info->blank_line_before_trailer = ends_with_blank_line(str,
+							       trailer_start);
+	info->trailer_start = str + trailer_start;
+	info->trailer_end = str + trailer_end;
+	info->trailers = trailer_strings;
+	info->trailer_nr = nr;
+}
+
+void trailer_info_release(struct trailer_info *info)
+{
+	int i;
+	for (i = 0; i < info->trailer_nr; i++)
+		free(info->trailers[i]);
+	free(info->trailers);
+}