I am new to Go and have been working through different issues I am having with the code I am trying to write. One problem though has me scratching my head. I have been searching net but so far did not find a way to solve this.
As you will see in the below code, I am using flag
to specify whether to create log file or not. The problem I am running into is that if I put w := bufio.NewWriter(f)
inside the if
loop then w
is inaccessible from the following for
loop. If I leave it outside of the if
loop then buffio
cannot access f
.
I know I am missing something dead simple, but I am at a loss at this moment.
Does anyone have any suggestions?
package main
import (
"bufio"
"flag"
"fmt"
"os"
"time"
"path/filepath"
"strconv"
)
var (
logFile = flag.String("file", "yes", "Save output into file")
t = time.Now()
dir, _ = filepath.Abs(filepath.Dir(os.Args[0]))
)
func main() {
flag.Parse()
name := dir + "/" + "output_" + strconv.FormatInt(t.Unix(), 10) + ".log"
if *logFile == "yes" {
f, err := os.Create(name)
if err != nil {
panic(err)
}
defer f.Close()
}
w := bufio.NewWriter(f)
for _, v := range my_slice {
switch {
case *logFile == "yes":
fmt.Fprintln(w, v)
case *logFile != "yes":
fmt.Println(v)
}
}
w.Flush()
}