Function extension [src]

Searches for a file extension separated by a . and returns the string after that .. Files that end or start with . and have no other . in their name are considered to have no extension, in which case this returns "". Examples: "main.zig" ⇒ ".zig" "src/main.zig" ⇒ ".zig" ".gitignore" ⇒ "" ".image.png" ⇒ ".png" "keep." ⇒ "." "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.

Prototype

pub fn extension(path: []const u8) []const u8

Parameters

path: []const u8

Example

 test extension {
    try testExtension("", "");
    try testExtension(".", "");
    try testExtension("a.", ".");
    try testExtension("abc.", ".");
    try testExtension(".a", "");
    try testExtension(".file", "");
    try testExtension(".gitignore", "");
    try testExtension(".image.png", ".png");
    try testExtension("file.ext", ".ext");
    try testExtension("file.ext.", ".");
    try testExtension("very-long-file.bruh", ".bruh");
    try testExtension("a.b.c", ".c");
    try testExtension("a.b.c/", ".c");

    try testExtension("/", "");
    try testExtension("/.", "");
    try testExtension("/a.", ".");
    try testExtension("/abc.", ".");
    try testExtension("/.a", "");
    try testExtension("/.file", "");
    try testExtension("/.gitignore", "");
    try testExtension("/file.ext", ".ext");
    try testExtension("/file.ext.", ".");
    try testExtension("/very-long-file.bruh", ".bruh");
    try testExtension("/a.b.c", ".c");
    try testExtension("/a.b.c/", ".c");

    try testExtension("/foo/bar/bam/", "");
    try testExtension("/foo/bar/bam/.", "");
    try testExtension("/foo/bar/bam/a.", ".");
    try testExtension("/foo/bar/bam/abc.", ".");
    try testExtension("/foo/bar/bam/.a", "");
    try testExtension("/foo/bar/bam/.file", "");
    try testExtension("/foo/bar/bam/.gitignore", "");
    try testExtension("/foo/bar/bam/file.ext", ".ext");
    try testExtension("/foo/bar/bam/file.ext.", ".");
    try testExtension("/foo/bar/bam/very-long-file.bruh", ".bruh");
    try testExtension("/foo/bar/bam/a.b.c", ".c");
    try testExtension("/foo/bar/bam/a.b.c/", ".c");
}

Source

  pub fn extension(path: []const u8) []const u8 {
    const filename = basename(path);
    const index = mem.lastIndexOfScalar(u8, filename, '.') orelse return path[path.len..];
    if (index == 0) return path[path.len..];
    return filename[index..];
}  