Make various goroutines panic-safe

kittens/diff/highlight.go

@@ -32,7 +32,7 @@ var highlighter = sync.OnceValue(func() highlight.Highlighter {
 func highlight_all(paths []string, light bool) {
 	ctx := images.Context{}
 	srd := prefer_light_colors(light)
-	ctx.Parallel(0, len(paths), func(nums <-chan int) {
+	if err := ctx.SafeParallel(0, len(paths), func(nums <-chan int) {
 		for i := range nums {
 			path := paths[i]
 			raw, err := highlighter().HighlightFile(path, &srd)
@@ -45,5 +45,7 @@ func highlight_all(paths []string, light bool) {
 				dark_highlighted_lines_cache.Set(path, text_to_lines(raw))
 			}
 		}
-	})
+	}); err != nil {
+		panic(err)
+	}
 }

kittens/diff/patch.go

@@ -358,14 +358,16 @@ func diff(jobs []diff_job, context_count int) (ans map[string]*Patch, err error)
 		patch        *Patch
 	}
 	results := make(chan result, len(jobs))
-	ctx.Parallel(0, len(jobs), func(nums <-chan int) {
+	if err := ctx.SafeParallel(0, len(jobs), func(nums <-chan int) {
 		for i := range nums {
 			job := jobs[i]
 			r := result{file1: job.file1, file2: job.file2}
 			r.patch, r.err = do_diff(job.file1, job.file2, context_count)
 			results <- r
 		}
-	})
+	}); err != nil {
+		panic(err)
+	}
 	close(results)
 	for r := range results {
 		if r.err != nil {

kittens/diff/search.go

@@ -106,7 +106,7 @@ func (self *Search) search(logical_lines *LogicalLines) {
 	self.matches = make(map[ScrollPos][]Span)
 	ctx := images.Context{}
 	mutex := sync.Mutex{}
-	ctx.Parallel(0, logical_lines.Len(), func(nums <-chan int) {
+	if err := ctx.SafeParallel(0, logical_lines.Len(), func(nums <-chan int) {
 		for i := range nums {
 			line := logical_lines.At(i)
 			if line.line_type == EMPTY_LINE || line.line_type == IMAGE_LINE {
@@ -121,7 +121,9 @@ func (self *Search) search(logical_lines *LogicalLines) {
 				}
 			})
 		}
-	})
+	}); err != nil {
+		panic(err)
+	}
 	for _, spans := range self.matches {
 		slices.SortFunc(spans, func(a, b Span) int { return a.start - b.start })
 	}