Add a read-only Files tab browsing a task's worktree

internal/git/ignore.go

@@ -0,0 +1,37 @@
+package git
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"os/exec"
+	"strings"
+)
+
+func Ignored(worktree string, paths []string) (map[string]bool, error) {
+	ignored := map[string]bool{}
+	if len(paths) == 0 {
+		return ignored, nil
+	}
+
+	cmd := exec.Command("git", "check-ignore", "--stdin", "-z")
+	cmd.Dir = worktree
+	cmd.Stdin = strings.NewReader(strings.Join(paths, "\x00") + "\x00")
+	stderr := &strings.Builder{}
+	cmd.Stderr = stderr
+	out, err := cmd.Output()
+	exit := &exec.ExitError{}
+	if errors.As(err, &exit) && exit.ExitCode() == 1 {
+		return ignored, nil
+	}
+	if err != nil {
+		return nil, fmt.Errorf("git check-ignore: %w: %s", err, strings.TrimSpace(stderr.String()))
+	}
+
+	for _, p := range bytes.Split(out, []byte{0}) {
+		if len(p) > 0 {
+			ignored[string(p)] = true
+		}
+	}
+	return ignored, nil
+}