authorgravatar for xq@random-projects.netFelix "xq" Queißner <xq@random-projects.net> 2020-11-13 11:53:51+01:00
committergravatar for xq@random-projects.netFelix "xq" Queißner <xq@random-projects.net> 2020-11-13 11:53:51+01:00
log25542738058de6361f71e5a39a7c64463956eaa0
tree7a0719ba5c424f543ba38b495e23177d3c5dff59
parent51717314e4c955f696919aea6f17d758b4b6430f

Implements std.fs.path.extension.

1 files changed, 57 insertions(+), 0 deletions(-)

lib/std/fs/path.zig+57
......@@ -1182,3 +1182,60 @@ fn testRelativeWindows(from: []const u8, to: []const u8, expected_output: []cons
11821182 defer testing.allocator.free(result);
11831183 testing.expectEqualSlices(u8, expected_output, result);
11841184}
1185
1186/// Returns the extension of the file name (if any).
1187/// This function will search for the file extension (separated by a `.`) and will return the text after the `.`.
1188/// Files that end with `.` are considered to have no extension.
1189pub fn extension(path: []const u8) ?[]const u8 {
1190 const filename = basename(path);
1191 return if (std.mem.lastIndexOf(u8, filename, ".")) |index|
1192 if (index == filename.len - 1)
1193 null
1194 else
1195 filename[index + 1 ..]
1196 else
1197 null;
1198}
1199
1200fn testExtension(path: []const u8, expected: ?[]const u8) void {
1201 const actual = extension(path);
1202
1203 if (expected) |must_be| {
1204 std.testing.expect(actual != null);
1205 std.testing.expectEqualStrings(must_be, actual.?);
1206 } else {
1207 std.testing.expectEqual(expected, actual);
1208 }
1209}
1210
1211test "extension" {
1212 testExtension("", null);
1213 testExtension(".", null);
1214 testExtension("a.", null);
1215 testExtension("abc.", null);
1216 testExtension(".a", "a");
1217 testExtension(".file", "file");
1218 testExtension(".gitignore", "gitignore");
1219 testExtension("file.gitignore", "gitignore");
1220 testExtension("a.gitignore", "gitignore");
1221
1222 testExtension("/", null);
1223 testExtension("/.", null);
1224 testExtension("/a.", null);
1225 testExtension("/abc.", null);
1226 testExtension("/.a", "a");
1227 testExtension("/.file", "file");
1228 testExtension("/.gitignore", "gitignore");
1229 testExtension("/file.gitignore", "gitignore");
1230 testExtension("/a.gitignore", "gitignore");
1231
1232 testExtension("/foo/bar/bam/", null);
1233 testExtension("/foo/bar/bam/.", null);
1234 testExtension("/foo/bar/bam/a.", null);
1235 testExtension("/foo/bar/bam/abc.", null);
1236 testExtension("/foo/bar/bam/.a", "a");
1237 testExtension("/foo/bar/bam/.file", "file");
1238 testExtension("/foo/bar/bam/.gitignore", "gitignore");
1239 testExtension("/foo/bar/bam/file.gitignore", "gitignore");
1240 testExtension("/foo/bar/bam/a.gitignore", "gitignore");
1241}