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