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Merge pull request #13276 from r00ster91/stem

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std.fs.path: add stem()
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Veikka Tuominen 2022-11-03 16:45:37 +02:00 committed by GitHub
commit 678f3f6e65
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1 changed files with 45 additions and 8 deletions
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53
lib/std/fs/path.zig
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@ -1257,14 +1257,14 @@ fn testRelativeWindows(from: []const u8, to: []const u8, expected_output: []cons
/// Files that end with `.`, or that start with `.` and have no other `.` in their name,
/// are considered to have no extension.
/// Examples:
/// - `"main.zig"` ⇒ `".zig"`
/// - `"src/main.zig"` ⇒ `".zig"`
/// - `".gitignore"` ⇒ `""`
/// - `".image.png"` ⇒ `".png"`
/// - `"keep."` ⇒ `"."`
/// - `"src.keep.me"` ⇒ `".me"`
/// - `"main.zig"` ⇒ `".zig"`
/// - `"src/main.zig"` ⇒ `".zig"`
/// - `".gitignore"` ⇒ `""`
/// - `".image.png"` ⇒ `".png"`
/// - `"keep."` ⇒ `"."`
/// - `"src.keep.me"` ⇒ `".me"`
/// - `"/src/keep.me"` ⇒ `".me"`
/// - `"/src/keep.me/"` ⇒ `".me"`
/// - `"/src/keep.me/"` ⇒ `".me"`
/// The returned slice is guaranteed to have its pointer within the start and end
/// pointer address range of `path`, even if it is length zero.
pub fn extension(path: []const u8) []const u8 {
@ -1275,7 +1275,7 @@ pub fn extension(path: []const u8) []const u8 {
}
fn testExtension(path: []const u8, expected: []const u8) !void {
try std.testing.expectEqualStrings(expected, extension(path));
try testing.expectEqualStrings(expected, extension(path));
}
test "extension" {
@ -1319,3 +1319,40 @@ test "extension" {
try testExtension("/foo/bar/bam/a.b.c", ".c");
try testExtension("/foo/bar/bam/a.b.c/", ".c");
}
/// Returns the last component of this path without its extension (if any):
/// - "hello/world/lib.tar.gz" ⇒ "lib.tar"
/// - "hello/world/lib.tar" ⇒ "lib"
/// - "hello/world/lib" ⇒ "lib"
pub fn stem(path: []const u8) []const u8 {
const filename = basename(path);
const index = mem.lastIndexOfScalar(u8, filename, '.') orelse return filename[0..];
if (index == 0) return path;
return filename[0..index];
}
fn testStem(path: []const u8, expected: []const u8) !void {
try testing.expectEqualStrings(expected, stem(path));
}
test "stem" {
try testStem("hello/world/lib.tar.gz", "lib.tar");
try testStem("hello/world/lib.tar", "lib");
try testStem("hello/world/lib", "lib");
try testStem("hello/lib/", "lib");
try testStem("hello...", "hello..");
try testStem("hello.", "hello");
try testStem("/hello.", "hello");
try testStem(".gitignore", ".gitignore");
try testStem(".image.png", ".image");
try testStem("file.ext", "file");
try testStem("file.ext.", "file.ext");
try testStem("a.b.c", "a.b");
try testStem("a.b.c/", "a.b");
try testStem(".a", ".a");
try testStem("///", "");
try testStem("..", ".");
try testStem(".", ".");
try testStem(" ", " ");
try testStem("", "");
}