hare

commit 7db2bed83d7233a9a95e9e272994932d618ab9b5
parent a5a086e570b3c77a83505f12fea0fbd2ece6c2ec
Author: Autumn! <autumnull@posteo.net>
Date:   Sun,  7 May 2023 01:43:25 +0000

path: implement peek()

Signed-off-by: Autumn! <autumnull@posteo.net>

Diffstat:
M
path/stack.ha
 | 
13
+++++++++++++

1 file changed, 13 insertions(+), 0 deletions(-)
diff --git a/path/stack.ha b/path/stack.ha
@@ -60,6 +60,19 @@ export fn push(buf: *buffer, items: str...) (str | errors::overflow) = {
 	free(s);
 };
 
+// Examine the final path segment in a buffer.
+// Returns void if the path is empty or is the root dir.
+export fn peek(buf: *const buffer) (str | void) = {
+	let trimmed = bytes::rtrim(buf.buf[..buf.end], PATHSEP);
+	if (len(trimmed) == 0) return void;
+	match (bytes::rindex(trimmed, PATHSEP)) {
+	case void =>
+		return strings::fromutf8_unsafe(buf.buf[..buf.end]);
+	case let i: size =>
+		return strings::fromutf8_unsafe(buf.buf[i+1..buf.end]);
+	};
+};
+
 // Remove and return the final path segment in a buffer.
 // Returns void if the path is empty or is the root dir.
 export fn pop(buf: *buffer) (str | void) = {