git · cbzehner · Aug 1, 2019 · giuscri · Sep 2, 2019
diff --git a/Documentation/gitignore.txt b/Documentation/gitignore.txt
@@ -74,8 +74,12 @@ PATTERN FORMAT
   for readability.

 - A line starting with # serves as a comment.
-   Put a backslash ("`\`") in front of the first hash for patterns
-   that begin with a hash.
+   Put a backslash ("`\`") in front of each hash for patterns
+   containing a hash.
+
+ - A # after a pattern will be treated as the start of a comment.
+   Put a backslash ("`\`") in front of each hash for patterns
+   containing a hash.

 - Trailing spaces are ignored unless they are quoted with backslash
   ("`\`").

diff --git a/dir.c b/dir.c
@@ -658,6 +658,38 @@ void clear_pattern_list(struct pattern_list *pl)
 	memset(pl, 0, sizeof(*pl));
 }

+static void trim_trailing_comments(char *buf)
+{
+	char *p, *last_hash = NULL;
+	int escape_seq = 0;
+
+	for (p = buf; *p; p++)
+	{
+		if (!*p)
+			return;
+		switch (*p) {
+		case '#':
+			if (escape_seq)
+			{
+				escape_seq = 0;
+				p++;
+				break;
+			}
+			if (!last_hash)
+				last_hash = p;
+			break;
+		case '\\':
+			escape_seq = 1;
+			break;
+		default:
+			escape_seq = 0;
+		}
+	}
+
+	if (last_hash)
+		*last_hash = '\0';
+}
+
 static void trim_trailing_spaces(char *buf)
 {
 	char *p, *last_space = NULL;
@@ -859,6 +891,7 @@ static int add_patterns_from_buffer(char *buf, size_t size,
 		if (buf[i] == '\n') {
 			if (entry != buf + i && entry[0] != '#') {
 				buf[i - (i && buf[i-1] == '\r')] = 0;
+				trim_trailing_comments(entry);
 				trim_trailing_spaces(entry);
 				add_pattern(entry, base, baselen, pl, lineno);
 			}