From 45eca43f5bead5d9d22e65e0609410b266c32e18 Mon Sep 17 00:00:00 2001
From: David Calavera <david.calavera@gmail.com>
Date: Thu, 3 Dec 2015 14:54:31 -0500
Subject: [PATCH] Implement docker history with the standalone client lib.

Signed-off-by: David Calavera <david.calavera@gmail.com>
---
 api/client/history.go     | 11 +----------
 api/client/lib/history.go | 23 +++++++++++++++++++++++
 2 files changed, 24 insertions(+), 10 deletions(-)
 create mode 100644 api/client/lib/history.go

diff --git a/api/client/history.go b/api/client/history.go
index f8a71c870d..fe092df08a 100644
--- a/api/client/history.go
+++ b/api/client/history.go
@@ -1,14 +1,12 @@
 package client
 
 import (
-	"encoding/json"
 	"fmt"
 	"strconv"
 	"strings"
 	"text/tabwriter"
 	"time"
 
-	"github.com/docker/docker/api/types"
 	Cli "github.com/docker/docker/cli"
 	flag "github.com/docker/docker/pkg/mflag"
 	"github.com/docker/docker/pkg/stringid"
@@ -28,18 +26,11 @@ func (cli *DockerCli) CmdHistory(args ...string) error {
 
 	cmd.ParseFlags(args, true)
 
-	serverResp, err := cli.call("GET", "/images/"+cmd.Arg(0)+"/history", nil, nil)
+	history, err := cli.client.ImageHistory(cmd.Arg(0))
 	if err != nil {
 		return err
 	}
 
-	defer serverResp.body.Close()
-
-	history := []types.ImageHistory{}
-	if err := json.NewDecoder(serverResp.body).Decode(&history); err != nil {
-		return err
-	}
-
 	w := tabwriter.NewWriter(cli.out, 20, 1, 3, ' ', 0)
 
 	if *quiet {
diff --git a/api/client/lib/history.go b/api/client/lib/history.go
new file mode 100644
index 0000000000..29064c65fb
--- /dev/null
+++ b/api/client/lib/history.go
@@ -0,0 +1,23 @@
+package lib
+
+import (
+	"encoding/json"
+	"net/url"
+
+	"github.com/docker/docker/api/types"
+)
+
+// ImageHistory returns the changes in an image in history format.
+func (cli *Client) ImageHistory(imageID string) ([]types.ImageHistory, error) {
+	var history []types.ImageHistory
+	serverResp, err := cli.GET("/images/"+imageID+"/history", url.Values{}, nil)
+	if err != nil {
+		return history, err
+	}
+	defer serverResp.body.Close()
+
+	if err := json.NewDecoder(serverResp.body).Decode(&history); err != nil {
+		return history, err
+	}
+	return history, nil
+}