Golang script for compiling markdown to HTML and copying to the clipboard

mdclip.go

package main

import (
    "log"
    "io/ioutil"
    "os"
    "os/exec"
    "path/filepath"
    "runtime"

    "github.com/russross/blackfriday"
)

func main(){
    arch := runtime.GOOS

    if len(os.Args) != 2 {
        log.Fatal("Usage: mdclip filename.md")
    }

    arg := os.Args[1]

    fp,err := filepath.Abs(arg);

    if err != nil {
        log.Fatal(err)
    }

    dat, err := ioutil.ReadFile(fp)
    if err != nil {
        log.Fatal(err)
    }

    output := blackfriday.MarkdownBasic([]byte(dat))
    toClipboard( output, arch )
}

func toClipboard( output []byte, arch string ){
    var copyBin string
    // Mac "OS"
    if arch == "darwin" {
        copyBin = "pbcopy"
    }

    // Linux
    if arch == "linux" {
          copyBin = "xclip"
    }

    copyCmd := exec.Command(copyBin, "-selection", "c")
    in, err := copyCmd.StdinPipe()

    if err != nil {
		log.Fatal(err)
	}

	if err := copyCmd.Start(); err != nil {
		log.Fatal(err)
	}

	if _, err := in.Write([]byte(output)); err != nil {
		log.Fatal(err)
	}

	if err := in.Close(); err != nil {
		log.Fatal(err)
	}

	copyCmd.Wait()
}