api,fn: entrypoint to return daemon version (#367)

fn/README.md

@@ -79,6 +79,10 @@ $ fn routes create otherapp /hello iron/hello   # create route
 
 $ fn routes delete otherapp hello              # delete route
 /hello deleted
+
+$ fn version                                   # shows version both of client and server
+Client version: 0.1.0
+Server version: 0.1.21
 ```
 
 ## Application level configuration

fn/main.go

@@ -9,10 +9,12 @@ import (
 	"github.com/urfave/cli"
 )
 
+const fnversion = "0.1.39"
+
 func main() {
 	app := cli.NewApp()
 	app.Name = "fn"
-	app.Version = "0.1.0"
+	app.Version = fnversion
 	app.Authors = []cli.Author{{Name: "iron.io"}}
 	app.Usage = "IronFunctions command line tools"
 	app.UsageText = `Check the manual at https://github.com/iron-io/functions/blob/master/fn/README.md
@@ -25,12 +27,13 @@ ENVIRONMENT VARIABLES:
 		build(),
 		bump(),
 		call(),
+		initFn(),
 		lambda(),
 		publish(),
 		push(),
 		routes(),
 		run(),
-		initFn(),
+		version(),
 	}
 	app.Run(os.Args)
 }
@@ -38,7 +41,7 @@ ENVIRONMENT VARIABLES:
 func resetBasePath(c *functions.Configuration) error {
 	apiURL := os.Getenv("API_URL")
 	if apiURL == "" {
-		apiURL = "http://localhost:8080/"
+		apiURL = "http://localhost:8080"
 	}
 
 	u, err := url.Parse(apiURL)

fn/version.go

@@ -0,0 +1,44 @@
+package main
+
+import (
+	"fmt"
+	"net/url"
+	"os"
+
+	functions "github.com/iron-io/functions_go"
+	"github.com/urfave/cli"
+)
+
+func version() cli.Command {
+	r := versionCmd{VersionApi: functions.NewVersionApi()}
+	return cli.Command{
+		Name:   "version",
+		Usage:  "displays fn and functions daemon versions",
+		Action: r.version,
+	}
+}
+
+type versionCmd struct {
+	*functions.VersionApi
+}
+
+func (r *versionCmd) version(c *cli.Context) error {
+	apiURL := os.Getenv("API_URL")
+	if apiURL == "" {
+		apiURL = "http://localhost:8080"
+	}
+
+	u, err := url.Parse(apiURL)
+	if err != nil {
+		return err
+	}
+	r.Configuration.BasePath = u.String()
+
+	fmt.Println("Client version:", fnversion)
+	v, _, err := r.VersionGet()
+	if err != nil {
+		return err
+	}
+	fmt.Println("Server version", v.Version)
+	return nil
+}