add cmd/dump - a dumper

Walk needed to be added to NeedleMap and CompactMap, to be able to add WalkKeys and WalkValues to volume. This is needed for iterating through all the stored needles in a volume - this was dump's purpose.

weed-fs/src/cmd/weed/shell.go

@@ -1,54 +1,53 @@
 package main
 
 import (
-  "bufio"
-  "os"
-  "fmt"
+	"bufio"
+	"fmt"
+	"os"
 )
 
 func init() {
-  cmdShell.Run = runShell // break init cycle
+	cmdShell.Run = runShell // break init cycle
 }
 
 var cmdShell = &Command{
-  UsageLine: "shell",
-  Short:     "run interactive commands, now just echo",
-  Long: `run interactive commands.
+	UsageLine: "shell",
+	Short:     "run interactive commands, now just echo",
+	Long: `run interactive commands.
 
   `,
 }
 
-var (
-)
+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
-  }
+	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
+	cmd := ""
+	for {
+		prompt()
+		cmd = readLine()
+		execCmd(cmd)
+	}
+	return true
 }