feat(client): print error messages to stderr

Author: Joshua-Anderson

client/cmd/auth.go

@@ -4,6 +4,7 @@ import (
 	"errors"
 	"fmt"
 	"net/url"
+	"os"
 	"strings"
 	"syscall"
 
@@ -72,7 +73,7 @@ func Register(controller string, username string, password string, email string,
 	c.Token = ""
 
 	if err != nil {
-		fmt.Print("Registration failed: ")
+		fmt.Fprint(os.Stderr, "Registration failed: ")
 		return err
 	}
 
@@ -187,7 +188,7 @@ func Passwd(username string, password string, newPassword string) error {
 	err = auth.Passwd(c, username, password, newPassword)
 
 	if err != nil {
-		fmt.Print("Password change failed: ")
+		fmt.Fprint(os.Stderr, "Password change failed: ")
 		return err
 	}
 
@@ -235,7 +236,7 @@ func Cancel(username string, password string, yes bool) error {
 	}
 
 	if yes == false {
-		fmt.Println("Account not changed")
+		fmt.Fprintln(os.Stderr, "Account not changed")
 		return nil
 	}
 

client/deis.go

@@ -67,12 +67,12 @@ Use 'git push deis master' to deploy to an application.
 	_, err := docopt.Parse(usage, []string{command}, false, version.Version, true, false)
 
 	if err != nil {
-		fmt.Println(err)
+		fmt.Fprintln(os.Stderr, err)
 		return 1
 	}
 
 	if len(argv) == 0 {
-		fmt.Println("Usage: deis <command> [<args>...]")
+		fmt.Fprintf(os.Stderr, "Usage: deis <command> [<args>...]")
 		return 1
 	}
 
@@ -139,7 +139,7 @@ Use 'git push deis master' to deploy to an application.
 		}
 	}
 	if err != nil {
-		fmt.Printf("Error: %v\n", err)
+		fmt.Fprintf(os.Stderr, "Error: %v\n", err)
 		return 1
 	}
 	return 0

client/parser/utils.go

@@ -2,6 +2,7 @@ package parser
 
 import (
 	"fmt"
+	"os"
 	"strconv"
 )
 
@@ -22,8 +23,8 @@ func responseLimit(limit string) (int, error) {
 
 // PrintUsage runs if no matching command is found.
 func PrintUsage() {
-	fmt.Println("Found no matching command, try 'deis help'")
-	fmt.Println("Usage: deis <command> [<args>...]")
+	fmt.Fprintln(os.Stderr, "Found no matching command, try 'deis help'")
+	fmt.Fprintln(os.Stderr, "Usage: deis <command> [<args>...]")
 }
 
 func printHelp(argv []string, usage string) bool {