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// This creates a simple hello world window
package main
import (
"log"
"fmt"
"os"
"io"
"time"
"bufio"
arg "github.com/alexflint/go-arg"
)
var args struct {
Foo string
Bar bool
User string `arg:"env:USER"`
Demo bool `help:"run a demo"`
}
var f1 *os.File
var f2 *os.File
var err error
func init() {
arg.MustParse(&args)
fmt.Println(args.Foo, args.Bar, args.User)
f1, err = os.OpenFile("/tmp/guilogfile", os.O_RDWR | os.O_CREATE | os.O_APPEND, 0666)
if err != nil {
log.Fatalf("error opening file: %v", err)
}
// hmm. is there a trick here or must this be in main()
// defer f.Close()
log.SetOutput(f1)
log.Println("This is a test log entry")
}
func captureSTDOUT() {
f2, _ = os.OpenFile("/tmp/my.log", os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0664)
multiWriter := io.MultiWriter(os.Stderr, f2)
rd, wr, err := os.Pipe()
if err != nil {
os.Exit(1)
}
// overwrite os.Stdout
os.Stderr = wr
go func() {
scanner := bufio.NewScanner(rd)
for scanner.Scan() {
stdoutLine := scanner.Text()
multiWriter.Write([]byte(stdoutLine + "\n"))
}
}()
fmt.Println("foobar")
// hacky sleep to ensure the go routine can write before program exits
time.Sleep(time.Second)
}
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