291c97ed0b
- pkg/output/formatter.go: Formatter interface, Options, Registry with Register/Get/Names, ErrUnknownFormat sentinel - pkg/output/colors.go: IsTTY + ColorsEnabled honoring NO_COLOR - Promote github.com/mattn/go-isatty to direct dependency - Unit tests cover registry round-trip, unknown lookup, sorted Names, non-TTY buffer, NO_COLOR override Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
35 lines
770 B
Go
35 lines
770 B
Go
package output
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import (
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"io"
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"os"
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"github.com/mattn/go-isatty"
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)
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// IsTTY reports whether f is an open terminal or Cygwin/MSYS pty.
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// Returns false for a nil file.
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func IsTTY(f *os.File) bool {
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if f == nil {
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return false
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}
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fd := f.Fd()
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return isatty.IsTerminal(fd) || isatty.IsCygwinTerminal(fd)
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}
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// ColorsEnabled reports whether ANSI color output should be emitted on w.
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// Returns false when:
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// - the NO_COLOR environment variable is set (https://no-color.org/), or
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// - w is not an *os.File (e.g. bytes.Buffer, strings.Builder), or
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// - w is an *os.File but not a terminal.
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func ColorsEnabled(w io.Writer) bool {
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if _, ok := os.LookupEnv("NO_COLOR"); ok {
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return false
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}
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f, ok := w.(*os.File)
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if !ok {
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return false
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}
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return IsTTY(f)
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}
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