From b8c3fa9e5476d5d6bb5413f9d52d406475f9e900 Mon Sep 17 00:00:00 2001
From: David Robillard <d@drobilla.net>
Date: Fri, 18 Dec 2020 16:52:55 +0100
Subject: Add lilv_path_filename()

---
 src/filesystem.c       | 22 ++++++++++++++++++++++
 src/filesystem.h       |  8 ++++++++
 test/test_filesystem.c | 23 +++++++++++++++++++++++
 3 files changed, 53 insertions(+)

diff --git a/src/filesystem.c b/src/filesystem.c
index c8a58c1..0ec9802 100644
--- a/src/filesystem.c
+++ b/src/filesystem.c
@@ -192,6 +192,28 @@ lilv_path_parent(const char* path)
 	}
 }
 
+char*
+lilv_path_filename(const char* path)
+{
+	const size_t path_len = strlen(path);
+	size_t       last_sep = path_len;
+	for (size_t i = 0; i < path_len; ++i) {
+		if (lilv_is_dir_sep(path[i])) {
+			last_sep = i;
+		}
+	}
+
+	if (last_sep >= path_len) {
+		return lilv_strdup(path);
+	}
+
+	const size_t ret_len = path_len - last_sep;
+	char* const  ret     = (char*)calloc(ret_len + 1, 1);
+
+	strncpy(ret, path + last_sep + 1, ret_len);
+	return ret;
+}
+
 char*
 lilv_path_join(const char* a, const char* b)
 {
diff --git a/src/filesystem.h b/src/filesystem.h
index 14f25d7..319dd49 100644
--- a/src/filesystem.h
+++ b/src/filesystem.h
@@ -60,6 +60,14 @@ lilv_path_relative_to(const char* path, const char* base);
 char*
 lilv_path_parent(const char* path);
 
+/**
+   Return the filename component of `path` without any directories.
+
+   Returns the empty string if `path` is the root path.
+*/
+char*
+lilv_path_filename(const char* path);
+
 /// Join path `a` and path `b` with a single directory separator between them
 char*
 lilv_path_join(const char* a, const char* b);
diff --git a/test/test_filesystem.c b/test/test_filesystem.c
index 8c7b1ba..a3288ed 100644
--- a/test/test_filesystem.c
+++ b/test/test_filesystem.c
@@ -129,6 +129,28 @@ test_path_parent(void)
 	assert(equals(lilv_path_parent("a"), "."));
 }
 
+static void
+test_path_filename(void)
+{
+	// Cases from cppreference.com for std::filesystem::path::filename
+	assert(equals(lilv_path_filename("/foo/bar.txt"), "bar.txt"));
+	assert(equals(lilv_path_filename("/foo/.bar"), ".bar"));
+	assert(equals(lilv_path_filename("/foo/bar/"), ""));
+	assert(equals(lilv_path_filename("/foo/."), "."));
+	assert(equals(lilv_path_filename("/foo/.."), ".."));
+	assert(equals(lilv_path_filename("."), "."));
+	assert(equals(lilv_path_filename(".."), ".."));
+	assert(equals(lilv_path_filename("/"), ""));
+	assert(equals(lilv_path_filename("//host"), "host"));
+
+#ifdef _WIN32
+	assert(equals(lilv_path_filename("C:/foo/bar.txt"), "bar.txt"));
+	assert(equals(lilv_path_filename("C:\\foo\\bar.txt"), "bar.txt"));
+	assert(equals(lilv_path_filename("foo/bar.txt"), "bar.txt"));
+	assert(equals(lilv_path_filename("foo\\bar.txt"), "bar.txt"));
+#endif
+}
+
 static void
 test_path_join(void)
 {
@@ -458,6 +480,7 @@ main(void)
 	test_path_absolute();
 	test_path_relative_to();
 	test_path_parent();
+	test_path_filename();
 	test_path_join();
 	test_path_canonical();
 	test_path_exists();
-- 
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