all: use fmt.Errorf for fomartting errors

Signed-off-by: Wagner Riffel <wgrriffel@gmail.com>

commands/account/next-folder.go

@@ -49,5 +49,5 @@ func (NextPrevFolder) Execute(aerc *widgets.Aerc, args []string) error {
 }
 
 func nextPrevFolderUsage(cmd string) error {
-	return errors.New(fmt.Sprintf("Usage: %s [n]", cmd))
+	return fmt.Errorf("Usage: %s [n]", cmd)
 }

commands/account/next-result.go

@@ -46,5 +46,5 @@ func (NextPrevResult) Execute(aerc *widgets.Aerc, args []string) error {
 }
 
 func nextPrevResultUsage(cmd string) error {
-	return errors.New(fmt.Sprintf("Usage: %s [<n>[%%]]", cmd))
+	return fmt.Errorf("Usage: %s [<n>[%%]]", cmd)
 }

commands/account/next.go

@@ -78,5 +78,5 @@ func ExecuteNextPrevMessage(args []string, acct *widgets.AccountView, pct bool,
 }
 
 func nextPrevMessageUsage(cmd string) error {
-	return errors.New(fmt.Sprintf("Usage: %s [<n>[%%]]", cmd))
+	return fmt.Errorf("Usage: %s [<n>[%%]]", cmd)
 }

commands/compose/next-field.go

@@ -1,7 +1,6 @@
 package compose
 
 import (
-	"errors"
 	"fmt"
 
 	"git.sr.ht/~sircmpwn/aerc/widgets"
@@ -35,5 +34,5 @@ func (NextPrevField) Execute(aerc *widgets.Aerc, args []string) error {
 }
 
 func nextPrevFieldUsage(cmd string) error {
-	return errors.New(fmt.Sprintf("Usage: %s", cmd))
+	return fmt.Errorf("Usage: %s", cmd)
 }

commands/ct.go

@@ -34,7 +34,7 @@ func (ChangeTab) Complete(aerc *widgets.Aerc, args []string) []string {
 
 func (ChangeTab) Execute(aerc *widgets.Aerc, args []string) error {
 	if len(args) != 2 {
-		return errors.New(fmt.Sprintf("Usage: %s <tab>", args[0]))
+		return fmt.Errorf("Usage: %s <tab>", args[0])
 	}
 	if args[1] == "-" {
 		ok := aerc.SelectPreviousTab()

commands/msgview/next-part.go

@@ -1,7 +1,6 @@
 package msgview
 
 import (
-	"errors"
 	"fmt"
 	"strconv"
 
@@ -48,5 +47,5 @@ func (NextPrevPart) Execute(aerc *widgets.Aerc, args []string) error {
 }
 
 func nextPrevPartUsage(cmd string) error {
-	return errors.New(fmt.Sprintf("Usage: %s [n]", cmd))
+	return fmt.Errorf("Usage: %s [n]", cmd)
 }

commands/msgview/toggle-headers.go

@@ -1,7 +1,6 @@
 package msgview
 
 import (
-	"errors"
 	"fmt"
 
 	"git.sr.ht/~sircmpwn/aerc/widgets"
@@ -31,5 +30,5 @@ func (ToggleHeaders) Execute(aerc *widgets.Aerc, args []string) error {
 }
 
 func toggleHeadersUsage(cmd string) error {
-	return errors.New(fmt.Sprintf("Usage: %s", cmd))
+	return fmt.Errorf("Usage: %s", cmd)
 }

commands/next-tab.go

@@ -1,7 +1,6 @@
 package commands
 
 import (
-	"errors"
 	"fmt"
 	"strconv"
 
@@ -47,5 +46,5 @@ func (NextPrevTab) Execute(aerc *widgets.Aerc, args []string) error {
 }
 
 func nextPrevTabUsage(cmd string) error {
-	return errors.New(fmt.Sprintf("Usage: %s [n]", cmd))
+	return fmt.Errorf("Usage: %s [n]", cmd)
 }

commands/prompt.go

@@ -1,7 +1,6 @@
 package commands
 
 import (
-	"errors"
 	"fmt"
 
 	"git.sr.ht/~sircmpwn/aerc/widgets"
@@ -23,7 +22,7 @@ func (Prompt) Complete(aerc *widgets.Aerc, args []string) []string {
 
 func (Prompt) Execute(aerc *widgets.Aerc, args []string) error {
 	if len(args) < 3 {
-		return errors.New(fmt.Sprintf("Usage: %s <prompt> <cmd>", args[0]))
+		return fmt.Errorf("Usage: %s <prompt> <cmd>", args[0])
 	}
 
 	prompt := args[1]

config/bindings.go

@@ -122,7 +122,7 @@ func ParseKeyStrokes(keystrokes string) ([]KeyStroke, error) {
 			if key, ok := keyNames[strings.ToLower(name)]; ok {
 				strokes = append(strokes, key)
 			} else {
-				return nil, errors.New(fmt.Sprintf("Unknown key '%s'", name))
+				return nil, fmt.Errorf("Unknown key '%s'", name)
 			}
 		case '>':
 			return nil, errors.New("Found '>' without '<'")