add support for json color output in repl using jq, if installed (#16)

pkg/cfg/jq.go

@@ -0,0 +1,38 @@
+/*
+Copyright © 2026 Thomas von Dein
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package cfg
+
+import (
+	"context"
+	"os/exec"
+	"strings"
+)
+
+func isJQinstalled() bool {
+	cmd := exec.CommandContext(context.Background(), "jq", "-h")
+	out, err := cmd.Output()
+	if err != nil {
+		return false
+	}
+
+	if strings.Contains(string(out), "Usage") {
+		return true
+	}
+
+	return false
+}