rename from cmd to weed for easier "go build"

go/weed/shell.go

@@ -0,0 +1,53 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+)
+
+func init() {
+	cmdShell.Run = runShell // break init cycle
+}
+
+var cmdShell = &Command{
+	UsageLine: "shell",
+	Short:     "run interactive commands, now just echo",
+	Long: `run interactive commands.
+
+  `,
+}
+
+var ()
+
+func runShell(command *Command, args []string) bool {
+	r := bufio.NewReader(os.Stdin)
+	o := bufio.NewWriter(os.Stdout)
+	e := bufio.NewWriter(os.Stderr)
+	prompt := func() {
+		o.WriteString("> ")
+		o.Flush()
+	}
+	readLine := func() string {
+		ret, err := r.ReadString('\n')
+		if err != nil {
+			fmt.Fprint(e, err)
+			os.Exit(1)
+		}
+		return ret
+	}
+	execCmd := func(cmd string) int {
+		if cmd != "" {
+			o.WriteString(cmd)
+		}
+		return 0
+	}
+
+	cmd := ""
+	for {
+		prompt()
+		cmd = readLine()
+		execCmd(cmd)
+	}
+	return true
+}