From ad5445ba9ff8e1ba03bf68cc107e8ff45c1bbafd Mon Sep 17 00:00:00 2001
From: Katalin Rebhan <me@dblsaiko.net>
Date: Fri, 9 May 2025 18:39:36 +0200
Subject: Show change-id header content if present

---
 cgit.h      |  1 +
 parsing.c   | 14 ++++++++++++--
 shared.c    |  3 +++
 ui-commit.c |  8 ++++++++
 4 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/cgit.h b/cgit.h
index b6bedd3..9a7d495 100644
--- a/cgit.h
+++ b/cgit.h
@@ -142,6 +142,7 @@ struct commitinfo {
 	char *subject;
 	char *msg;
 	char *msg_encoding;
+	char *change_id;
 };
 
 struct taginfo {
diff --git a/parsing.c b/parsing.c
index 115ce81..2274dd7 100644
--- a/parsing.c
+++ b/parsing.c
@@ -169,8 +169,18 @@ struct commitinfo *cgit_parse_commit(struct commit *commit)
 	if (!ret->msg_encoding)
 		ret->msg_encoding = xstrdup("UTF-8");
 
-	while (!end_of_header(p))
-		p = next_header_line(p);
+	while (!end_of_header(p)) {
+		if (p && skip_prefix(p, "change-id ", &p)) {
+			t = strchr(p, '\n');
+			if (t) {
+				ret->change_id = substr(p, t + 1);
+				p = t + 1;
+			}
+		} else {
+			p = next_header_line(p);
+		}
+	}
+
 	while (p && *p == '\n')
 		p++;
 	if (!p)
diff --git a/shared.c b/shared.c
index 07b38ba..86be047 100644
--- a/shared.c
+++ b/shared.c
@@ -108,6 +108,9 @@ void cgit_free_commitinfo(struct commitinfo *info)
 	free(info->subject);
 	free(info->msg);
 	free(info->msg_encoding);
+	if (info->change_id) {
+		free(info->change_id);
+	}
 	free(info);
 }
 
diff --git a/ui-commit.c b/ui-commit.c
index 5536ffc..12de4c7 100644
--- a/ui-commit.c
+++ b/ui-commit.c
@@ -73,7 +73,15 @@ void cgit_print_commit(char *hex, const char *prefix)
 	html_txt(show_date(info->committer_date, info->committer_tz,
 				cgit_date_mode(DATE_ISO8601)));
 	html("</td></tr>\n");
+
+	if (info->change_id) {
+		html("<tr><th>change</th><td colspan='2' class='sha1'>");
+		html_txt(info->change_id);
+		html("</td></tr>\n");
+	}
+
 	html("<tr><th>commit</th><td colspan='2' class='oid'>");
+
 	tmp = oid_to_hex(&commit->object.oid);
 	cgit_commit_link(tmp, NULL, NULL, ctx.qry.head, tmp, prefix);
 	html(" (");
-- 
cgit 1.5.1