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main.go
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main.go
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package main
import (
"flag"
"fmt"
"io/ioutil"
"os"
"github.com/gitlawr/mergeyaml/merger"
)
var (
formerFile string
latterFile string
outputFile string
)
func init() {
flag.Usage = func() {
fmt.Fprintf(os.Stdout, "Usage:\n%s <formerYamlFile> <latterFile>\n", os.Args[0])
flag.PrintDefaults()
}
// parse flags
flag.StringVar(&outputFile, "output", "merge_output.yml", "output file")
flag.StringVar(&outputFile, "o", "merge_output.yml", "output file (shorthand)")
flag.Parse()
args := flag.Args()
if len(args) != 2 {
flag.Usage()
os.Exit(0)
}
formerFile = args[0]
latterFile = args[1]
}
func main() {
fdat, err := ioutil.ReadFile(formerFile)
check(err)
ldat, err := ioutil.ReadFile(latterFile)
check(err)
mdat, err := merger.MergeYaml(fdat, ldat)
check(err)
err = ioutil.WriteFile(outputFile, mdat, 0644)
check(err)
}
func check(e error) {
if e != nil {
fmt.Fprintf(os.Stderr, "Error: %v", e)
os.Exit(1)
}
}