codecrafters-shell-go/app/main.go

package main

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

import "github.com/codecrafters-io/shell-starter-go/app/runnable"
import "github.com/codecrafters-io/shell-starter-go/app/core"

func getInput(ctx *core.Context) (string, error) {
	fmt.Print("$ ")
	input, err := bufio.NewReader(ctx.Stdin).ReadString('\n')
	if err != nil {
		return "", err
	}
	return input[:len(input)-1], nil
}

func repl(ctx *core.Context) {
	for {
		input, err := getInput(ctx)
		if err != nil {
			fmt.Fprintln(os.Stderr, "Error reading input: ", err)
			os.Exit(15)
		}

		runnable, err := runnable.Parse(ctx, input)
		// fmt.Printf("main():runnable=%#v\n", runnable)
		if err != nil {
			fmt.Fprintln(ctx.Stderr, err)
			continue
		}

		result := runnable.Run(ctx)
		switch result.Code {
		case core.ActionResultCodeExit:
			os.Exit(int(result.ExitStatus))
		case core.ActionResultCodeNoop:
		case core.ActionResultCodeBuiltinCommand:
		case core.ActionResultCodeExternalCommand:
		default:
			fmt.Fprintf(os.Stderr, "unknown action result code input: %d", result.Code)
			os.Exit(15)
		}
	}
}

func main() {
	ctx := core.Context{
		Stdout: os.Stdout,
		Stderr: os.Stderr,
		Stdin:  os.Stdin,
	}
	repl(&ctx)
}