Init

go.mod

@@ -0,0 +1,8 @@
+module qr-cli
+
+go 1.16
+
+require (
+	github.com/mdp/qrterminal v1.0.1
+	rsc.io/qr v0.2.0
+)

go.sum

@@ -0,0 +1,4 @@
+github.com/mdp/qrterminal v1.0.1 h1:07+fzVDlPuBlXS8tB0ktTAyf+Lp1j2+2zK3fBOL5b7c=
+github.com/mdp/qrterminal v1.0.1/go.mod h1:Z33WhxQe9B6CdW37HaVqcRKzP+kByF3q/qLxOGe12xQ=
+rsc.io/qr v0.2.0 h1:6vBLea5/NRMVTz8V66gipeLycZMl/+UlFmk8DvqQ6WY=
+rsc.io/qr v0.2.0/go.mod h1:IF+uZjkb9fqyeF/4tlBoynqmQxUoPfWEKh921coOuXs=

main.go

@@ -0,0 +1,61 @@
+package main
+
+import (
+	"bufio"
+	"flag"
+	"log"
+	"os"
+	"strings"
+
+	"github.com/mdp/qrterminal"
+	"rsc.io/qr"
+)
+
+func main() {
+
+	var levelString string
+	var line string
+
+	flag.StringVar(&levelString, "l", "m", "Level of error checking (Low: \"l\", Med: \"m\", High: \"h\")")
+	flag.StringVar(&line, "i", "", "Input string to generate QR code from")
+
+	flag.Parse()
+
+	var level qr.Level
+
+	switch strings.ToLower(levelString) {
+	case "l":
+		level = 0
+	case "m":
+		level = 1
+	case "h":
+		level = 2
+	default:
+		log.Fatalln("Error: Invalid level")
+	}
+
+	stats, _ := os.Stdin.Stat()
+
+	if stats.Mode()&os.ModeNamedPipe != 0 && line == "" {
+		scanner := bufio.NewScanner(os.Stdin)
+		for scanner.Scan() {
+			line += scanner.Text()
+		}
+		if err := scanner.Err(); err != nil {
+			log.Fatalln("Error: Error reading stdin:", err)
+		}
+	} else if line == "" {
+		log.Printf("Error: nothing passed to stdin or input as a flag, please try again.\n\n")
+		flag.CommandLine.Usage()
+		os.Exit(1)
+	}
+
+	config := qrterminal.Config{
+		Level:     level,
+		Writer:    os.Stdout,
+		BlackChar: qrterminal.BLACK,
+		WhiteChar: qrterminal.WHITE,
+		QuietZone: 1,
+	}
+	qrterminal.GenerateWithConfig(line, config)
+}