seaweedfs/weed-fs/src/cmd/weed/shell.go

package main

import (
  "bufio"
  "os"
  "fmt"
)

func init() {
  cmdShell.Run = runShell // break init cycle
}

var cmdShell = &Command{
  UsageLine: "shell",
  Short:     "run interactive commands, now just echo",
  Long: `run interactive commands.

  `,
}

var (
)

func runShell(command *Command, args []string) bool {
  r := bufio.NewReader(os.Stdin)
  o := bufio.NewWriter(os.Stdout)
  e := bufio.NewWriter(os.Stderr)
  prompt := func () { 
    o.WriteString("> ")
    o.Flush()
  };
  readLine := func () string { 
    ret, err := r.ReadString('\n')
    if err != nil { 
       fmt.Fprint(e,err); 
       os.Exit(1)
    }
    return ret
  }
  execCmd := func (cmd string) int { 
    if cmd != "" { 
      o.WriteString(cmd)
    }
    return 0
  }

  cmd := ""
  for { 
    prompt()
    cmd = readLine()
    execCmd(cmd)
  } 
  return true
}