From 8fa6531b1cff8288d453dafa656753fb08192aeb Mon Sep 17 00:00:00 2001
From: Ben Johnson <benbjohnson@yahoo.com>
Date: Fri, 21 Mar 2014 22:05:28 -0600
Subject: [PATCH] Add 'bolt keys'.

---
 cmd/bolt/main.go      | 46 ++++++++++++++++++++++++++++++++++++++++---
 cmd/bolt/main_test.go | 32 ++++++++++++++++++++++++++++++
 2 files changed, 75 insertions(+), 3 deletions(-)

diff --git a/cmd/bolt/main.go b/cmd/bolt/main.go
index 0a17a13..c29d5df 100644
--- a/cmd/bolt/main.go
+++ b/cmd/bolt/main.go
@@ -23,14 +23,19 @@ func NewApp() *cli.App {
 		{
 			Name:   "get",
 			Usage:  "retrieve a value for given key",
-			Action: Get,
+			Action: GetCommand,
+		},
+		{
+			Name:   "keys",
+			Usage:  "retrieve a list of all keys in a bucket",
+			Action: KeysCommand,
 		},
 	}
 	return app
 }
 
-// Get retrieves the value for a given bucket/key.
-func Get(c *cli.Context) {
+// GetCommand retrieves the value for a given bucket/key.
+func GetCommand(c *cli.Context) {
 	path, name, key := c.Args().Get(0), c.Args().Get(1), c.Args().Get(2)
 	if _, err := os.Stat(path); os.IsNotExist(err) {
 		fatal(err)
@@ -68,6 +73,41 @@ func Get(c *cli.Context) {
 	}
 }
 
+// KeysCommand retrieves a list of keys for a given bucket.
+func KeysCommand(c *cli.Context) {
+	path, name := c.Args().Get(0), c.Args().Get(1)
+	if _, err := os.Stat(path); os.IsNotExist(err) {
+		fatal(err)
+		return
+	}
+
+	db, err := bolt.Open(path, 0600)
+	if err != nil {
+		fatal(err)
+		return
+	}
+	defer db.Close()
+
+	err = db.With(func(tx *bolt.Tx) error {
+		// Find bucket.
+		b := tx.Bucket(name)
+		if b == nil {
+			fatalf("bucket not found: %s", name)
+			return nil
+		}
+
+		// Iterate over each key.
+		return b.ForEach(func(key, _ []byte) error {
+			logger.Println(string(key))
+			return nil
+		})
+	})
+	if err != nil {
+		fatal(err)
+		return
+	}
+}
+
 var logger = log.New(os.Stderr, "", 0)
 var logBuffer *bytes.Buffer
 
diff --git a/cmd/bolt/main_test.go b/cmd/bolt/main_test.go
index 5c70c97..95b4df5 100644
--- a/cmd/bolt/main_test.go
+++ b/cmd/bolt/main_test.go
@@ -53,6 +53,38 @@ func TestGetKeyNotFound(t *testing.T) {
 	})
 }
 
+// Ensure that a list of keys can be retrieved for a given bucket.
+func TestKeys(t *testing.T) {
+	SetTestMode(true)
+	open(func(db *bolt.DB) {
+		db.Do(func(tx *bolt.Tx) error {
+			tx.CreateBucket("widgets")
+			tx.Bucket("widgets").Put([]byte("0002"), []byte(""))
+			tx.Bucket("widgets").Put([]byte("0001"), []byte(""))
+			tx.Bucket("widgets").Put([]byte("0003"), []byte(""))
+			return nil
+		})
+		output := run("keys", db.Path(), "widgets")
+		assert.Equal(t, "0001\n0002\n0003", output)
+	})
+}
+
+// Ensure that an error is reported if the database is not found.
+func TestKeysDBNotFound(t *testing.T) {
+	SetTestMode(true)
+	output := run("keys", "no/such/db", "widgets")
+	assert.Equal(t, "stat no/such/db: no such file or directory", output)
+}
+
+// Ensure that an error is reported if the bucket is not found.
+func TestKeysBucketNotFound(t *testing.T) {
+	SetTestMode(true)
+	open(func(db *bolt.DB) {
+		output := run("keys", db.Path(), "widgets")
+		assert.Equal(t, "bucket not found: widgets", output)
+	})
+}
+
 // open creates and opens a Bolt database in the temp directory.
 func open(fn func(*bolt.DB)) {
 	f, _ := ioutil.TempFile("", "bolt-")