Output errors to STDERR, add description for the usage page, etc

main.go

@@ -3,7 +3,6 @@ package main
 import (
 	"gitea.com/webb/teal"
 	"github.com/urfave/cli"
-	"log"
 	"os"
 )
 
@@ -13,14 +12,17 @@ var itCl = teal.Client{
 
 func main() {
 	cli := &cli.App{
+    Name: "interrupt",
+    Usage: "a simple CLI for pxl.blue",
+    Description: "This is a simple CLI for pxl.blue. You can upload images, get account information and more.",
 		Commands: []*cli.Command{
 			{
 				Name:    "upload",
 				Aliases: []string{"u"},
 				Usage:   "upload a file",
 				Action: func(c *cli.Context) error {
-					uploadHandler(c.Args().First())
-					return nil
+          err := uploadHandler(c.Args().First())
+					return err
 				},
 			},
 			{
@@ -43,6 +45,7 @@ func main() {
 
 	err := cli.Run(os.Args)
 	if err != nil {
-		log.Fatal(err)
+    os.Stderr.WriteString("interrupt: " + err.Error() + "\n")
+    os.Exit(1)
 	}
 }

upload.go

@@ -9,8 +9,7 @@ import (
 func uploadHandler(a string) error {
 	uploadKey, err := getUploadKey()
 	if err != nil {
-		fmt.Println(err)
-		os.Exit(1)
+		return err
 	}
 
 	var reader io.Reader