fix: strip ansi from gum filter when output is not a tty

filter/command.go

@@ -10,8 +10,10 @@ import (
 	"github.com/charmbracelet/bubbles/textinput"
 	"github.com/charmbracelet/bubbles/viewport"
 	tea "github.com/charmbracelet/bubbletea"
+	"github.com/mattn/go-isatty"
 	"github.com/sahilm/fuzzy"
 
+	"github.com/charmbracelet/gum/ansi"
 	"github.com/charmbracelet/gum/internal/exit"
 	"github.com/charmbracelet/gum/internal/files"
 	"github.com/charmbracelet/gum/internal/stdin"
@@ -98,15 +100,25 @@ func (o Options) Run() error {
 		return exit.ErrAborted
 	}
 
+	isTTY := isatty.IsTerminal(os.Stdout.Fd())
+
 	// allSelections contains values only if limit is greater
 	// than 1 or if flag --no-limit is passed, hence there is
 	// no need to further checks
 	if len(m.selected) > 0 {
 		for k := range m.selected {
-			fmt.Println(k)
+			if isTTY {
+				fmt.Println(k)
+			} else {
+				fmt.Println(ansi.Strip(k))
+			}
 		}
 	} else if len(m.matches) > m.cursor && m.cursor >= 0 {
-		fmt.Println(m.matches[m.cursor].Str)
+		if isTTY {
+			fmt.Println(m.matches[m.cursor].Str)
+		} else {
+			fmt.Println(ansi.Strip(m.matches[m.cursor].Str))
+		}
 	}
 
 	if !o.Strict && len(m.textinput.Value()) != 0 && len(m.matches) == 0 {