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main.go
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main.go
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package main
import (
"flag"
"github.com/edigaryev/keanu/preprocessor"
"log"
"os"
)
const (
argInputPath = iota
argOutputPath
argMax
)
func main() {
flag.Parse()
if len(flag.Args()) == 0 || len(flag.Args()) > argMax {
log.Fatal("usage: keanu input.yaml [output.yaml]")
}
inputPath := flag.Arg(argInputPath)
p, err := preprocessor.NewFromFile(inputPath)
if err != nil {
log.Fatal(err)
}
err = p.Run()
if err != nil {
log.Fatal(err)
}
// Determine the output destination: stdout or file
var output *os.File
if len(flag.Args()) == argMax {
outputPath := flag.Arg(argOutputPath)
output, err = os.OpenFile(outputPath, os.O_WRONLY|os.O_TRUNC|os.O_CREATE, 0644)
if err != nil {
log.Fatal(err)
}
defer output.Close()
} else {
output = os.Stdout
}
out, err := p.Dump()
if err != nil {
log.Fatal(err)
}
_, err = output.Write(out)
if err != nil {
log.Fatal(err)
}
err = output.Close()
if err != nil {
log.Fatal(err)
}
}