myshell/cmd_jobs.go

package main

import (
	"fmt"
	"os"
	"strconv"
)

// 显示job列表
func cmd_jobs(fields []string, stdin *os.File, stdout *os.File, stderr *os.File) {
	if len(fields) == 1 { // 如果没有参数
		for i, job := range jobs { // 则输出所有job
			fmt.Fprintf(stdout, "[%d]    %d %s\t%s\n", i, job.cmd.Process.Pid, job.state, job.work)
		}
	} else {
		for _, jid := range fields[1:] { // 遍历参数
			id, err := strconv.Atoi(jid[1:]) // 字符串转数字
			if err != nil {
				panic("jobs: job not found: " + jid)
			}

			_, ok := jobs[id] // 是否有指定编号的job
			if !ok {
				panic("jobs: %" + jid[1:] + ": no such job")
			}
			fmt.Fprintf(stdout, "[%d]    %d %s\t%s\n", id, jobs[id].cmd.Process.Pid, jobs[id].state, jobs[id].work)
		}
	}
}