clipboard_image_command.go RawHistoryFolder

1package tui
2
3import (
4	"context"
5	"errors"
6	"fmt"
7	"os/exec"
8	"strings"
9	"time"
10)
11
12var errClipboardImageCommandUnavailable = errors.New("clipboard image command is unavailable")
13
14// runClipboardImageCommand keeps binary stdout separate from diagnostics and
15// caps both streams. Clipboard utilities can be controlled by another process,
16// so neither their output size nor their run time is trusted.
17func runClipboardImageCommand(name string, maxOutput int, args ...string) ([]byte, error) {
18	path, err := exec.LookPath(name)
19	if err != nil {
20		return nil, errClipboardImageCommandUnavailable
21	}
22
23	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
24	defer cancel()
25	var stdout, stderr cappedBuffer
26	stdout.max = maxOutput
27	stderr.max = maxClipboardDiagnosticBytes
28	cmd := exec.CommandContext(ctx, path, args...)
29	cmd.Stdout = &stdout
30	cmd.Stderr = &stderr
31	err = cmd.Run()
32	if ctx.Err() != nil {
33		return nil, fmt.Errorf("%s timed out: %w", name, ctx.Err())
34	}
35	if stdout.overflow {
36		return nil, fmt.Errorf("%s output exceeds %d bytes", name, maxOutput)
37	}
38	if err != nil {
39		diagnostic := strings.TrimSpace(stderr.String())
40		if diagnostic == "" {
41			return nil, fmt.Errorf("%s failed: %w", name, err)
42		}
43		if stderr.overflow {
44			diagnostic += " (truncated)"
45		}
46		return nil, fmt.Errorf("%s failed: %w: %s", name, err, diagnostic)
47	}
48	return append([]byte(nil), stdout.Bytes()...), nil
49}