diff options
| -rw-r--r-- | modules/music-config.el | 10 | ||||
| -rw-r--r-- | tests/test-music-config--append-track-to-m3u-file.el | 119 |
2 files changed, 122 insertions, 7 deletions
diff --git a/modules/music-config.el b/modules/music-config.el index 92b04782..075ed49b 100644 --- a/modules/music-config.el +++ b/modules/music-config.el @@ -677,9 +677,15 @@ M3U-FILE should be an existing, writable M3U file path." (unless (file-writable-p m3u-file) (error "M3U file is not writable: %s" m3u-file)) - ;; Convert absolute path to relative path from music root + ;; Write the path relative to the playlist's own directory, which is the base + ;; `cj/music--m3u-file-tracks' and EMMS both resolve against. This used to be + ;; `cj/music-root'. For a playlist inside the music root the two are the same + ;; directory, so the disagreement stayed invisible until a playlist lived + ;; somewhere else -- then the appended line resolved against the wrong base and + ;; pointed at a file that was never there. (let ((relative-path (if (file-name-absolute-p track-path) - (file-relative-name track-path cj/music-root) + (file-relative-name track-path + (file-name-directory m3u-file)) track-path))) ;; Determine if we need a leading newline (let ((needs-prefix-newline nil) diff --git a/tests/test-music-config--append-track-to-m3u-file.el b/tests/test-music-config--append-track-to-m3u-file.el index be0cbd8e..06327b9d 100644 --- a/tests/test-music-config--append-track-to-m3u-file.el +++ b/tests/test-music-config--append-track-to-m3u-file.el @@ -39,7 +39,8 @@ "Append to brand new empty M3U file." (test-music-config--append-track-to-m3u-file-setup) (unwind-protect - (let* ((m3u-file (cj/create-temp-test-file "test-playlist-")) + (let* ((cj/music-root (cj/create-test-base-dir)) + (m3u-file (cj/create-temp-test-file "test-playlist-")) (track-path (expand-file-name "artist/song.mp3" cj/music-root)) (expected-relative "artist/song.mp3")) (cj/music--append-track-to-m3u-file track-path m3u-file) @@ -53,6 +54,7 @@ (test-music-config--append-track-to-m3u-file-setup) (unwind-protect (let* ((existing-content "first.mp3\n") + (cj/music-root (cj/create-test-base-dir)) (m3u-file (cj/create-temp-test-file-with-content existing-content "test-playlist-")) (track-path (expand-file-name "second.mp3" cj/music-root)) (expected-relative "second.mp3")) @@ -68,6 +70,7 @@ (test-music-config--append-track-to-m3u-file-setup) (unwind-protect (let* ((existing-content "first.mp3") + (cj/music-root (cj/create-test-base-dir)) (m3u-file (cj/create-temp-test-file-with-content existing-content "test-playlist-")) (track-path (expand-file-name "second.mp3" cj/music-root)) (expected-relative "second.mp3")) @@ -82,7 +85,8 @@ "Multiple appends to same file all succeed (allows duplicates)." (test-music-config--append-track-to-m3u-file-setup) (unwind-protect - (let* ((m3u-file (cj/create-temp-test-file "test-playlist-")) + (let* ((cj/music-root (cj/create-test-base-dir)) + (m3u-file (cj/create-temp-test-file "test-playlist-")) (track1 (expand-file-name "track1.mp3" cj/music-root)) (track2 (expand-file-name "track2.mp3" cj/music-root)) (track1-duplicate (expand-file-name "track1.mp3" cj/music-root)) @@ -98,13 +102,112 @@ (concat rel1 "\n" rel2 "\n" rel1 "\n")))))) (test-music-config--append-track-to-m3u-file-teardown))) +;;; Normal Cases: round-trip with the reader + +(ert-deftest test-music-config--append-track-to-m3u-file-normal-round-trips-through-the-reader () + "Normal: the same-directory case round-trips through the reader. +A positive control only. With the playlist and the music root in one +directory both candidate bases produce the same string, so this passes +against the old writer too — the discriminating cases are the two tests +below, which put the bases at different depths." + (test-music-config--append-track-to-m3u-file-setup) + (unwind-protect + (let* ((base (cj/create-test-base-dir)) + (cj/music-root base) + (m3u-file (cj/create-temp-test-file "test-playlist-")) + (track-path (expand-file-name "artist/song.mp3" base))) + (cj/music--append-track-to-m3u-file track-path m3u-file) + (should (equal (cj/music--m3u-file-tracks m3u-file) + (list track-path)))) + (test-music-config--append-track-to-m3u-file-teardown))) + +(ert-deftest test-music-config--append-track-to-m3u-file-normal-round-trips-outside-the-music-root () + "Normal/regression: a playlist living outside `cj/music-root' round-trips. +This is the case the old writer got wrong. It based every relative path on +`cj/music-root' wherever the playlist sat, while the reader resolved against +the playlist's directory. Inside the music root the two coincide, which is +why the defect stayed invisible until a playlist moved out of it." + (test-music-config--append-track-to-m3u-file-setup) + (unwind-protect + ;; The layout mirrors the real one: playlists/ and audio/ are siblings + ;; under mpd/, and the music root is a separate tree at a different depth. + ;; The depth difference is load-bearing -- put the music root alongside + ;; playlists/ instead and both bases yield the same relative path, so the + ;; test passes against the broken writer and proves nothing. + (let* ((base (cj/create-test-base-dir)) + (playlists (expand-file-name "mpd/playlists/" base)) + (audio (expand-file-name "mpd/audio/" base)) + (cj/music-root (expand-file-name "music/" base)) + (m3u-file (expand-file-name "ambience.m3u" playlists)) + (track-path (expand-file-name "rain-loop.mp3" audio))) + (make-directory playlists t) + (make-directory audio t) + (make-directory cj/music-root t) + (with-temp-buffer (write-file m3u-file)) + (cj/music--append-track-to-m3u-file track-path m3u-file) + (should (equal (cj/music--m3u-file-tracks m3u-file) + (list track-path)))) + (test-music-config--append-track-to-m3u-file-teardown))) + +(ert-deftest test-music-config--append-track-to-m3u-file-normal-base-is-the-playlist-not-the-music-root () + "Normal: the written line is relative to the playlist's own directory. +Stated directly as well as via the round-trip, so a reader change could not +quietly make both sides agree on the wrong base." + (test-music-config--append-track-to-m3u-file-setup) + (unwind-protect + ;; Same depth asymmetry as the round-trip test above, and for the same + ;; reason: with the music root alongside playlists/ both bases agree and + ;; the assertion holds against the broken writer. + (let* ((base (cj/create-test-base-dir)) + (playlists (expand-file-name "mpd/playlists/" base)) + (audio (expand-file-name "mpd/audio/" base)) + (cj/music-root (expand-file-name "music/" base)) + (m3u-file (expand-file-name "ambience.m3u" playlists)) + (track-path (expand-file-name "rain-loop.mp3" audio))) + (make-directory playlists t) + (make-directory audio t) + (make-directory cj/music-root t) + (with-temp-buffer (write-file m3u-file)) + (cj/music--append-track-to-m3u-file track-path m3u-file) + (with-temp-buffer + (insert-file-contents m3u-file) + (should (string= (buffer-string) "../audio/rain-loop.mp3\n")))) + (test-music-config--append-track-to-m3u-file-teardown))) + +(ert-deftest test-music-config--append-track-to-m3u-file-normal-deep-parent-chain-round-trips () + "Normal: a track several levels above the playlist round-trips. +The single \"../\" the tests above exercise is the shallow case. Once +playlists and audio can live anywhere, a multi-level chain is the shape most +likely to be broken by a later \"let's normalize these paths\" edit, and +nothing else here would catch it." + (test-music-config--append-track-to-m3u-file-setup) + (unwind-protect + (let* ((base (cj/create-test-base-dir)) + (playlists (expand-file-name "a/b/c/playlists/" base)) + (cj/music-root (expand-file-name "music/" base)) + (m3u-file (expand-file-name "deep.m3u" playlists)) + (track-path (expand-file-name "faraway/song.mp3" base))) + (make-directory playlists t) + (make-directory (expand-file-name "faraway/" base) t) + (make-directory cj/music-root t) + (with-temp-buffer (write-file m3u-file)) + (cj/music--append-track-to-m3u-file track-path m3u-file) + (with-temp-buffer + (insert-file-contents m3u-file) + ;; playlists/ -> c -> b -> a -> base is four hops up. + (should (string= (buffer-string) "../../../../faraway/song.mp3\n"))) + (should (equal (cj/music--m3u-file-tracks m3u-file) + (list track-path)))) + (test-music-config--append-track-to-m3u-file-teardown))) + ;;; Boundary Cases (ert-deftest test-music-config--append-track-to-m3u-file-boundary-very-long-path-appends-successfully () "Append very long track path without truncation." (test-music-config--append-track-to-m3u-file-setup) (unwind-protect - (let* ((m3u-file (cj/create-temp-test-file "test-playlist-")) + (let* ((cj/music-root (cj/create-test-base-dir)) + (m3u-file (cj/create-temp-test-file "test-playlist-")) ;; Create a relative path that's ~450 chars long (relative-path (concat (make-string 440 ?a) "/song.mp3")) (track-path (expand-file-name relative-path cj/music-root))) @@ -119,7 +222,8 @@ "Append path with unicode characters preserves UTF-8 encoding." (test-music-config--append-track-to-m3u-file-setup) (unwind-protect - (let* ((m3u-file (cj/create-temp-test-file "test-playlist-")) + (let* ((cj/music-root (cj/create-test-base-dir)) + (m3u-file (cj/create-temp-test-file "test-playlist-")) (relative-path "中文/artist-名前/song🎵.mp3") (track-path (expand-file-name relative-path cj/music-root))) (cj/music--append-track-to-m3u-file track-path m3u-file) @@ -132,7 +236,8 @@ "Append path with spaces and special characters." (test-music-config--append-track-to-m3u-file-setup) (unwind-protect - (let* ((m3u-file (cj/create-temp-test-file "test-playlist-")) + (let* ((cj/music-root (cj/create-test-base-dir)) + (m3u-file (cj/create-temp-test-file "test-playlist-")) (relative-path "Artist Name/Album (2024)/01 - Song's Title [Remix].mp3") (track-path (expand-file-name relative-path cj/music-root))) (cj/music--append-track-to-m3u-file track-path m3u-file) @@ -146,6 +251,7 @@ (test-music-config--append-track-to-m3u-file-setup) (unwind-protect (let* ((existing-content "#EXTM3U\n#EXTINF:-1,Radio Station\nhttp://stream.url/radio\n") + (cj/music-root (cj/create-test-base-dir)) (m3u-file (cj/create-temp-test-file-with-content existing-content "test-playlist-")) (relative-path "local-track.mp3") (track-path (expand-file-name relative-path cj/music-root))) @@ -172,6 +278,9 @@ "Signal error when M3U file is read-only." (test-music-config--append-track-to-m3u-file-setup) (unwind-protect + ;; No `cj/music-root' rebinding here: the writable-p guard signals before + ;; any path computation runs, so binding it would imply a dependency the + ;; read-only path does not have. (let* ((m3u-file (cj/create-temp-test-file "test-playlist-")) (track-path "/home/user/music/song.mp3")) ;; Make file read-only |