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main.go
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main.go
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package main
import (
"bufio"
"fmt"
"io"
"log"
"os"
"os/exec"
"os/user"
"strings"
)
func parseArgs(input string) []string {
if strings.HasPrefix(input, "alias") {
return strings.SplitN(input, " ", 2)
}
return strings.Split(input, " ")
}
func lookCommand(cmd string) {
value := aliasTable[cmd]
if value != "" {
fmt.Printf("%s: aliased to %s\n", cmd, value)
return
}
value, err := exec.LookPath(cmd)
if err == nil {
fmt.Printf("%s: %s\n", cmd, value)
return
}
fmt.Printf("%s NOT FOUND\n", cmd)
}
func executeInput(input string) error {
input = os.ExpandEnv(input)
input = expandWildcardInCmd(input)
if strings.HasPrefix(input, `\`) {
input = input[1:]
} else {
input = expandAlias(input)
}
args := parseArgs(input)
if args[0] == "which" {
for _, cmd := range args[1:] {
lookCommand(cmd)
}
return nil
}
if args[0] == "cd" {
err := os.Chdir(args[1])
return err
}
if args[0] == "alias" {
// args = ["alias", "ls='ls -l'"]
// kv = ["ls", "'ls -l'"]
kv := strings.Split(args[1], "=")
// key = "ls", val = "ls -l"
key, val := kv[0], strings.Trim(kv[1], "'")
setAlias(key, val)
return nil
}
if args[0] == "unalias" {
// args = ["unalias", "ls"]
key := args[1]
unsetAlias(key)
return nil
}
if args[0] == "export" {
// args = ["export", "FOO=bar"]
kv := strings.Split(args[1], "=")
key, val := kv[0], kv[1]
err := os.Setenv(key, val)
return err
}
if args[0] == "unset" {
// args = ["unset", "FOO"]
err := os.Unsetenv(args[1])
return err
}
cmd := exec.Command(args[0], args[1:]...)
cmd.Stdin = os.Stdin
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
err := cmd.Run()
return err
}
func showPrompt() {
u, _ := user.Current()
host, _ := os.Hostname()
wd, _ := os.Getwd()
userAndHost := blue(u.Username + "@" + host)
wd = yellowWithBlueBG(wd)
fmt.Printf("%s %s > ", userAndHost, wd)
}
func initialize() {
homeDir, _ := os.UserHomeDir()
file, err := os.Open(homeDir + "/.goshrc")
if err != nil {
return
}
goshrcReader := bufio.NewReader(file)
for {
input, err := goshrcReader.ReadString('\n')
if err == io.EOF {
return
}
input = strings.TrimSpace(input)
executeInput(input)
}
}
func main() {
initialize()
stdin := bufio.NewReader(os.Stdin)
for {
showPrompt()
input, _ := stdin.ReadString('\n')
input = strings.TrimSpace(input)
err := executeInput(input)
if err != nil {
log.Println(err)
}
}
}