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Highlight syntax in diff views

e7982ac5137be6e891616cdcdedc035f9019f99b · Keenan Nemetz · 12d ago · parent a76b2f38

Highlight syntax in diff views

The diff parser now names each file's Prism language from the new path (or the old path for a deletion), and the shared diff template carries that language plus the side of every line. app.js queues a diff once per side, so an old-side string or comment cannot colour new-side lines, and the token palette now covers diff cells as well as blobs.

The commit, compare, and change-request Files views all use the same template, so they gain highlighting together.

server/web/diff_test.go +37

@@ -40,6 +40,9 @@ func TestParseDiff(t *testing.T) {
	40	40	if first.Added != 2 \|\| first.Removed != 1 {
	41	41	t.Fatalf("counts = +%d −%d, want +2 −1", first.Added, first.Removed)
	42	42	}
		43	if first.Language != "markdown" {
		44	t.Fatalf("readme language = %q, want markdown", first.Language)
		45	}
	43	46	if len(first.Hunks) != 1 \|\| len(first.Hunks[0].Lines) != 5 {
	44	47	t.Fatalf("hunk shape = %+v", first.Hunks)
	45	48	}
@@ -60,6 +63,40 @@ func TestParseDiff(t *testing.T) {
	60	63	if second.Removed != 2 {
	61	64	t.Fatalf("deletion counts = −%d", second.Removed)
	62	65	}
		66	if second.Language != "" {
		67	t.Fatalf("plain-text deletion language = %q, want none", second.Language)
		68	}
		69	}
		70
		71	// A deletion has no new path, so its language comes from the old one. A rename
		72	// uses the new name, which is the file a reviewer sees in the review tree.
		73	func TestDiffLanguageUsesTheVisiblePath(t *testing.T) {
		74	t.Parallel()
		75	files := parseDiff(`diff --git a/gone.go b/gone.go
		76	deleted file mode 100644
		77	--- a/gone.go
		78	+++ /dev/null
		79	@@ -1 +0,0 @@
		80	-package gone
		81	diff --git a/old.py b/new.py
		82	similarity index 90%
		83	rename from old.py
		84	rename to new.py
		85	--- a/old.py
		86	+++ b/new.py
		87	@@ -1 +1 @@
		88	-old
		89	+new
		90	`)
		91	if len(files) != 2 {
		92	t.Fatalf("parsed %d files, want 2: %+v", len(files), files)
		93	}
		94	if files[0].Language != "go" {
		95	t.Fatalf("deletion language = %q, want go", files[0].Language)
		96	}
		97	if files[1].Language != "python" {
		98	t.Fatalf("rename language = %q, want python", files[1].Language)
		99	}
	63	100	}
	64	101
	65	102	func TestParseDiffOfABinaryFile(t *testing.T) {