add sleep command

plugins/sleepcmd.go

@@ -0,0 +1,51 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"github.com/vladimirvivien/gosh/api"
+	"io"
+	"strconv"
+	"time"
+)
+
+type sleepCmd string
+
+func (s sleepCmd) Name() string {
+	return string(s)
+}
+func (s sleepCmd) Usage() string     { return "Usage: sleep <duration>" }
+func (s sleepCmd) ShortDesc() string { return "sleeps for <duration> seconds" }
+
+func (s sleepCmd) LongDesc() string { return s.ShortDesc() }
+
+func (s sleepCmd) Exec(ctx context.Context, args []string) (context.Context, error) {
+	if len(args) == 2 {
+		duration, err := strconv.Atoi(args[1])
+		if err != nil {
+			return ctx, err
+		}
+		time.Sleep(time.Duration(duration) * time.Second)
+		return ctx, nil
+	}
+	out := ctx.Value("gosh.stdout").(io.Writer)
+	fmt.Fprintln(out, s.Usage())
+	return ctx, nil
+
+}
+
+type sleepCmds struct{}
+
+func (s *sleepCmds) Init(ctx context.Context) error {
+	out := ctx.Value("gosh.stdout").(io.Writer)
+	fmt.Fprintln(out, "sleep module loaded")
+	return nil
+}
+
+func (s *sleepCmds) Registry() map[string]api.Command {
+	return map[string]api.Command{
+		"sleep": sleepCmd("sleep"),
+	}
+}
+
+var Commands sleepCmds