Initial commit

.gitignore

@@ -0,0 +1,2 @@
+fstab
+fstabfmt

go.mod

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+module github.com/xyproto/fstabfmt
+
+go 1.16

main.go

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+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+)
+
+const versionString = "fstabfmt 0.1.0"
+
+func usage() {
+	fmt.Println(versionString)
+	fmt.Println()
+	fmt.Println("Usage: fstabfmt [-i FILE]")
+	fmt.Println()
+	fmt.Println("fstabfmt formats /etc/fstab files.")
+	fmt.Println("It can either read from stdin and print to stdout")
+	fmt.Println("or modify the given file if the -i flag is used.")
+	fmt.Println()
+	fmt.Println("-h, --help       Display this help")
+	fmt.Println("-v, --version    Display the current version")
+	fmt.Println("-i FILE          Supply a file that will be modified")
+	fmt.Println()
+}
+
+func main() {
+	var (
+		data     []byte
+		err      error
+		filename = "-"
+	)
+
+	fmt.Println(os.Args)
+
+	if len(os.Args) > 2 {
+		if os.Args[1] == "-i" {
+			filename = os.Args[2]
+
+		} else {
+			usage()
+			os.Exit(1)
+		}
+	} else if len(os.Args) > 1 {
+		switch os.Args[1] {
+		case "-v", "--version":
+			fmt.Println(versionString)
+			os.Exit(0)
+		case "-h", "--help":
+			usage()
+			os.Exit(0)
+		default:
+			filename = os.Args[1]
+		}
+	} else {
+		usage()
+		os.Exit(1)
+	}
+
+	if filename == "-" {
+		data, err = ioutil.ReadAll(os.Stdin)
+	} else {
+		data, err = ioutil.ReadFile(filename)
+	}
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+
+	fmt.Println("DATA")
+	fmt.Println(string(data))
+}