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Fix file argument detection when stdin is /dev/null #414

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Merged
antonmedv merged 1 commit into from
May 11, 2026
Merged

Fix file argument detection when stdin is /dev/null #414

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11 changes: 10 additions & 1 deletion main.go
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Original file line number Diff line number Diff line change
Expand Up @@ -157,10 +157,19 @@ func main() {
fd := os.Stdin.Fd()
stdinIsTty := isatty.IsTerminal(fd) || isatty.IsCygwinTerminal(fd)

// Check if stdin is actually piped/redirected input, not just non-TTY
// Default to false (treat as file/code mode) if we can't stat stdin
stdinIsInput := false
if stat, err := os.Stdin.Stat(); err == nil {
// ModeCharDevice is 0 for regular files and pipes, meaning actual data
stdinIsInput = (stat.Mode() & os.ModeCharDevice) == 0
}

var fileName string
var src io.Reader

if stdinIsTty {
// Use file mode when stdin is TTY or when stdin is a non-input device (e.g., /dev/null in launch agents)
if stdinIsTty || !stdinIsInput {
if len(args) == 0 {
// $ fx
fmt.Println(usage())
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