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Respects leading . and ignores it.

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This commit is contained in:
Felix (xq) Queißner 2020-11-13 12:48:01 +01:00
parent 2554273805
commit f51064f79e
1 changed files with 20 additions and 11 deletions
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31
lib/std/fs/path.zig
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@ -1185,11 +1185,17 @@ fn testRelativeWindows(from: []const u8, to: []const u8, expected_output: []cons
/// Returns the extension of the file name (if any). /// Returns the extension of the file name (if any).
/// This function will search for the file extension (separated by a `.`) and will return the text after the `.`. /// This function will search for the file extension (separated by a `.`) and will return the text after the `.`.
/// Files that end with `.` are considered to have no extension. /// Files that end with `.` are considered to have no extension, files that start with `.`
/// Examples:
/// - `"main.zig"` ⇒ `"zig"`
/// - `"src/main.zig"` ⇒ `"zig"`
/// - `".gitignore"` ⇒ `null`
/// - `"keep."` ⇒ `null`
/// - `"src.keep.me"` ⇒ `"me"`
pub fn extension(path: []const u8) ?[]const u8 { pub fn extension(path: []const u8) ?[]const u8 {
const filename = basename(path); const filename = basename(path);
return if (std.mem.lastIndexOf(u8, filename, ".")) |index| return if (std.mem.lastIndexOf(u8, filename, ".")) |index|
if (index == filename.len - 1) if (index == 0 or index == filename.len - 1)
null null
else else
filename[index + 1 ..] filename[index + 1 ..]
@ -1213,29 +1219,32 @@ test "extension" {
testExtension(".", null); testExtension(".", null);
testExtension("a.", null); testExtension("a.", null);
testExtension("abc.", null); testExtension("abc.", null);
testExtension(".a", "a"); testExtension(".a", null);
testExtension(".file", "file"); testExtension(".file", null);
testExtension(".gitignore", "gitignore"); testExtension(".gitignore", null);
testExtension("file.gitignore", "gitignore"); testExtension("file.gitignore", "gitignore");
testExtension("a.gitignore", "gitignore"); testExtension("a.gitignore", "gitignore");
testExtension("a.b.c", "c");
testExtension("/", null); testExtension("/", null);
testExtension("/.", null); testExtension("/.", null);
testExtension("/a.", null); testExtension("/a.", null);
testExtension("/abc.", null); testExtension("/abc.", null);
testExtension("/.a", "a"); testExtension("/.a", null);
testExtension("/.file", "file"); testExtension("/.file", null);
testExtension("/.gitignore", "gitignore"); testExtension("/.gitignore", null);
testExtension("/file.gitignore", "gitignore"); testExtension("/file.gitignore", "gitignore");
testExtension("/a.gitignore", "gitignore"); testExtension("/a.gitignore", "gitignore");
testExtension("/a.b.c", "c");
testExtension("/foo/bar/bam/", null); testExtension("/foo/bar/bam/", null);
testExtension("/foo/bar/bam/.", null); testExtension("/foo/bar/bam/.", null);
testExtension("/foo/bar/bam/a.", null); testExtension("/foo/bar/bam/a.", null);
testExtension("/foo/bar/bam/abc.", null); testExtension("/foo/bar/bam/abc.", null);
testExtension("/foo/bar/bam/.a", "a"); testExtension("/foo/bar/bam/.a", null);
testExtension("/foo/bar/bam/.file", "file"); testExtension("/foo/bar/bam/.file", null);
testExtension("/foo/bar/bam/.gitignore", "gitignore"); testExtension("/foo/bar/bam/.gitignore", null);
testExtension("/foo/bar/bam/file.gitignore", "gitignore"); testExtension("/foo/bar/bam/file.gitignore", "gitignore");
testExtension("/foo/bar/bam/a.gitignore", "gitignore"); testExtension("/foo/bar/bam/a.gitignore", "gitignore");
testExtension("/foo/bar/bam/a.b.c", "c");
} }