/
main.go
101 lines (92 loc) · 1.54 KB
/
main.go
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package main
import (
"bufio"
"fmt"
"os"
"strings"
)
var prompt string
var path string
var infunc bool
var fname string
func main() {
stdin := bufio.NewReader(os.Stdin)
prompt = "% "
for {
fmt.Print(prompt)
str, err := stdin.ReadString('\n')
if err != nil {
fmt.Println(err)
os.Exit(1)
}
str = strings.Trim(str, "\n\r ")
if str != "" {
s, f := parser(str)
commands(s, len(s), f)
}
}
}
func commands(s []string, slen int, f string) {
cmd := s[0]
slen = slen - 1
args := s
if !infunc {
switch cmd {
case "cd":
chdir(args[1:], slen)
case "version":
version()
case "exit":
os.Exit(0)
case "set":
setvar(args[1:], slen)
case "go":
go commands(args[1:], slen,f)
case "@":
script(args[1:], slen)
case "run":
script(args[1:], slen)
default:
execute(cmd, args, slen)
}
}
}
func chdir(args []string, slen int) {
err := os.Chdir(args[0])
if err != nil {
fmt.Println(err)
}
}
func version() {
fmt.Println("go userland shell.")
}
func setvar(s []string, slen int) {
if slen < 2 {
fmt.Println("set [parameter] [value]")
return
}
para := s[0]
val := s[1]
switch para {
case "prompt":
prompt = val
case "path":
path = val
default:
fmt.Println("Unknown parameter:", para)
}
}
func execute(cmd string, args []string, slen int) {
var procattr os.ProcAttr
procattr.Files = []*os.File{os.Stdin, os.Stdout, os.Stderr}
if path != "" {
cmd = path + cmd
}
proc, err := os.StartProcess(cmd, args, &procattr)
if err != nil {
fmt.Println(err)
return
}
proc.Wait()
return
}