hare

commit 6a5dbe35b0ea90dbb6edeba87ac852267b0edb1e
parent d2e78b43d5e05701603e8635cbd091cc2450ce5c
Author: Autumn! <autumnull@posteo.net>
Date:   Sun,  7 May 2023 01:43:27 +0000

path: implement parent()

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

Diffstat:
M
path/stack.ha
 | 
10
++++++++++

1 file changed, 10 insertions(+), 0 deletions(-)
diff --git a/path/stack.ha b/path/stack.ha
@@ -182,3 +182,13 @@ export fn join(items: str...) str = {
 	static let buf = buffer { ... };
 	return strings::dup(set(&buf, items...)!);
 };
+
+// Returns the parent directory for a given path, without modifying the buffer.
+// If the path is the root directory, the root directory is returned. The value
+// is either borrowed from the input or statically allocated; use
+// [[strings::dup]] to extend its lifetime or modify it.
+export fn parent(buf: *const buffer) (str | errors::overflow) = {
+	const newend = appendnorm(buf, dotdot)?;
+	if (newend == 0) return ".";
+	return strings::fromutf8_unsafe(buf.buf[..newend]);
+};