chore: add support for perfsprint

.golangci.yml

@@ -45,6 +45,7 @@ linters:
     - nakedret # Finds naked returns in functions greater than a specified function length [fast: true, auto-fix: false]
     - nolintlint # Reports ill-formed or insufficient nolint directives [fast: true, auto-fix: false]
     - nosprintfhostport # Checks for misuse of Sprintf to construct a host with port in a URL. [fast: true, auto-fix: false]
+    - perfsprint # Checks that fmt.Sprintf can be replaced with a faster alternative. [fast: false, auto-fix: false]
     - prealloc # Finds slice declarations that could potentially be pre-allocated [fast: true, auto-fix: false]
     - predeclared # find code that shadows one of Go's predeclared identifiers [fast: true, auto-fix: false]
     - promlinter # Check Prometheus metrics naming via promlint [fast: true, auto-fix: false]
@@ -102,6 +103,9 @@ issues:
   exclude-dirs:
     - internal/pkg
 
+  max-issues-per-linter: 0
+  max-same-issues: 0
+
   exclude-rules:
     - path: _test\.go
       linters:

internal/args/errors.go

@@ -188,7 +188,7 @@ type CannotParseDateError struct {
 }
 
 func (e *CannotParseDateError) Error() string {
-	return fmt.Sprintf(`date parsing error: could not parse %s`, e.ArgValue)
+	return "date parsing error: could not parse " + e.ArgValue
 }
 
 type CannotParseBoolError struct {

internal/args/unmarshal.go

@@ -5,6 +5,7 @@ package args
 // into CLI arguments represented as Go data.
 
 import (
+	"errors"
 	"fmt"
 	"io"
 	"net"
@@ -32,7 +33,7 @@ var unmarshalFuncs = map[reflect.Type]UnmarshalFunc{
 		// Only support G, GB for now (case insensitive).
 		value = strings.ToLower(value)
 		if !strings.HasSuffix(value, "g") && !strings.HasSuffix(value, "gb") {
-			return fmt.Errorf("size must be defined using the G or GB unit")
+			return errors.New("size must be defined using the G or GB unit")
 		}
 
 		bytes, err := humanize.ParseBytes(value)
@@ -70,7 +71,7 @@ var unmarshalFuncs = map[reflect.Type]UnmarshalFunc{
 		}
 
 		if len(value) == 0 {
-			return fmt.Errorf("empty time given")
+			return errors.New("empty time given")
 		}
 
 		// Handle relative time

internal/core/checks_test.go

@@ -2,7 +2,7 @@ package core_test
 
 import (
 	"context"
-	"fmt"
+	"errors"
 	"path/filepath"
 	"reflect"
 	"strings"
@@ -35,7 +35,7 @@ func TestCheckAPIKey(t *testing.T) {
 			api := iam.NewAPI(ctx.Client)
 			accessKey, exists := ctx.Client.GetAccessKey()
 			if !exists {
-				return fmt.Errorf("missing access-key")
+				return errors.New("missing access-key")
 			}
 
 			apiKey, err := api.GetAPIKey(&iam.GetAPIKeyRequest{

internal/core/cobra_usage_builder.go

@@ -126,7 +126,7 @@ func buildExamples(binaryName string, cmd *Command) string {
 
 	for _, cmdExample := range cmd.Examples {
 		// Build title.
-		title := fmt.Sprintf("  %s", cmdExample.Short)
+		title := "  " + cmdExample.Short
 		commandLine := cmdExample.GetCommandLine(binaryName, cmd)
 
 		commandLine = interactive.Indent(commandLine, 4)

internal/core/cobra_utils.go

@@ -59,15 +59,15 @@ func cobraRun(ctx context.Context, cmd *Command) func(*cobra.Command, []string)
 		if exist {
 			otherArgs := rawArgs.Remove(positionalArgSpec.Name)
 			return &CliError{
-				Err:  fmt.Errorf("a positional argument is required for this command"),
+				Err:  errors.New("a positional argument is required for this command"),
 				Hint: positionalArgHint(meta.BinaryName, cmd, value, otherArgs, len(positionalArgs) > 0),
 			}
 		}
 
 		// If no positional arguments were provided, return an error
 		if len(positionalArgs) == 0 {
 			return &CliError{
-				Err:  fmt.Errorf("a positional argument is required for this command"),
+				Err:  errors.New("a positional argument is required for this command"),
 				Hint: positionalArgHint(meta.BinaryName, cmd, "<"+positionalArgSpec.Name+">", rawArgs, false),
 			}
 		}
@@ -209,7 +209,7 @@ func handleUnmarshalErrors(cmd *Command, unmarshalErr *args.UnmarshalArgError) e
 		switch e.Err.(type) {
 		case *args.CannotParseBoolError:
 			return &CliError{
-				Err:     fmt.Errorf(""),
+				Err:     errors.New(""),
 				Message: fmt.Sprintf("invalid value for '%s' argument: invalid boolean value", unmarshalErr.ArgName),
 				Hint:    "Possible values: true, false",
 			}
@@ -237,7 +237,7 @@ Relative time error: %s
 
 		return &CliError{
 			Err:  fmt.Errorf("invalid argument '%s': %s", unmarshalErr.ArgName, e.Error()),
-			Hint: fmt.Sprintf("Valid arguments are: %s", strings.Join(argNames, ", ")),
+			Hint: "Valid arguments are: " + strings.Join(argNames, ", "),
 		}
 	case *args.UnknownArgError:
 		argNames := []string(nil)
@@ -248,7 +248,7 @@ Relative time error: %s
 
 		return &CliError{
 			Err:  fmt.Errorf("unknown argument '%s'", unmarshalErr.ArgName),
-			Hint: fmt.Sprintf("Valid arguments are: %s", strings.Join(argNames, ", ")),
+			Hint: "Valid arguments are: " + strings.Join(argNames, ", "),
 		}
 
 	default:

internal/core/cobra_utils_test.go

@@ -2,7 +2,7 @@ package core_test
 
 import (
 	"context"
-	"fmt"
+	"errors"
 	"reflect"
 	"testing"
 	"time"
@@ -115,7 +115,7 @@ func Test_handleUnmarshalErrors(t *testing.T) {
 		Check: core.TestCheckCombine(
 			core.TestCheckExitCode(1),
 			core.TestCheckError(&core.CliError{
-				Err:  fmt.Errorf("invalid argument 'name_id': arg name must only contain lowercase letters, numbers or dashes"),
+				Err:  errors.New("invalid argument 'name_id': arg name must only contain lowercase letters, numbers or dashes"),
 				Hint: "Valid arguments are: name-id",
 			}),
 		),
@@ -127,7 +127,7 @@ func Test_handleUnmarshalErrors(t *testing.T) {
 		Check: core.TestCheckCombine(
 			core.TestCheckExitCode(1),
 			core.TestCheckError(&core.CliError{
-				Err:  fmt.Errorf("invalid argument 'ubuntu_focal': arg name must only contain lowercase letters, numbers or dashes"),
+				Err:  errors.New("invalid argument 'ubuntu_focal': arg name must only contain lowercase letters, numbers or dashes"),
 				Hint: "Valid arguments are: name-id",
 			}),
 		),
@@ -143,7 +143,7 @@ func Test_handleUnmarshalErrors(t *testing.T) {
 				Details: `Absolute time error: parsing time "+3R" as "2006-01-02T15:04:05Z07:00": cannot parse "+3R" as "2006"
 Relative time error: unknown unit in duration: "R"
 `,
-				Err:  fmt.Errorf("date parsing error: +3R"),
+				Err:  errors.New("date parsing error: +3R"),
 				Hint: "Run `scw help date` to learn more about date parsing",
 			}),
 		),
@@ -177,7 +177,7 @@ func Test_PositionalArg(t *testing.T) {
 			Check: core.TestCheckCombine(
 				core.TestCheckExitCode(1),
 				core.TestCheckError(&core.CliError{
-					Err:  fmt.Errorf("a positional argument is required for this command"),
+					Err:  errors.New("a positional argument is required for this command"),
 					Hint: "Try running: scw test positional <name-id>",
 				}),
 			),
@@ -189,7 +189,7 @@ func Test_PositionalArg(t *testing.T) {
 			Check: core.TestCheckCombine(
 				core.TestCheckExitCode(1),
 				core.TestCheckError(&core.CliError{
-					Err:  fmt.Errorf("a positional argument is required for this command"),
+					Err:  errors.New("a positional argument is required for this command"),
 					Hint: "Try running: scw test positional <name-id> tag=world",
 				}),
 			),
@@ -201,7 +201,7 @@ func Test_PositionalArg(t *testing.T) {
 			Check: core.TestCheckCombine(
 				core.TestCheckExitCode(1),
 				core.TestCheckError(&core.CliError{
-					Err:  fmt.Errorf("a positional argument is required for this command"),
+					Err:  errors.New("a positional argument is required for this command"),
 					Hint: "Try running: scw test positional plop tag=world",
 				}),
 			),
@@ -213,7 +213,7 @@ func Test_PositionalArg(t *testing.T) {
 			Check: core.TestCheckCombine(
 				core.TestCheckExitCode(1),
 				core.TestCheckError(&core.CliError{
-					Err:  fmt.Errorf("a positional argument is required for this command"),
+					Err:  errors.New("a positional argument is required for this command"),
 					Hint: "Try running: scw test positional plop tag=world",
 				}),
 			),
@@ -225,7 +225,7 @@ func Test_PositionalArg(t *testing.T) {
 			Check: core.TestCheckCombine(
 				core.TestCheckExitCode(1),
 				core.TestCheckError(&core.CliError{
-					Err:  fmt.Errorf("a positional argument is required for this command"),
+					Err:  errors.New("a positional argument is required for this command"),
 					Hint: "Try running: scw test positional plop",
 				}),
 			),
@@ -311,7 +311,7 @@ func Test_MultiPositionalArg(t *testing.T) {
 		Check: core.TestCheckCombine(
 			core.TestCheckExitCode(1),
 			core.TestCheckError(&core.CliError{
-				Err:  fmt.Errorf("a positional argument is required for this command"),
+				Err:  errors.New("a positional argument is required for this command"),
 				Hint: "Try running: scw test multi-positional <name-ids> tag=tag1",
 			}),
 		),

internal/core/command.go

@@ -162,8 +162,8 @@ func (c *Command) seeAlsosAsStr() string {
 	seeAlsos := make([]string, 0, len(c.SeeAlsos))
 
 	for _, cmdSeeAlso := range c.SeeAlsos {
-		short := fmt.Sprintf("  # %s", cmdSeeAlso.Short)
-		commandStr := fmt.Sprintf("  %s", cmdSeeAlso.Command)
+		short := "  # " + cmdSeeAlso.Short
+		commandStr := "  " + cmdSeeAlso.Command
 
 		seeAlsoLines := []string{
 			short,

internal/core/errors.go

@@ -1,6 +1,7 @@
 package core
 
 import (
+	"errors"
 	"fmt"
 )
 
@@ -74,6 +75,6 @@ func ArgumentConflictError(arg1 string, arg2 string) *CliError {
 
 func WindowIsNotSupportedError() *CliError {
 	return &CliError{
-		Err: fmt.Errorf("windows is not currently supported"),
+		Err: errors.New("windows is not currently supported"),
 	}
 }

internal/core/printer.go

@@ -2,6 +2,7 @@ package core
 
 import (
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
 	"reflect"
@@ -103,7 +104,7 @@ func setupTemplatePrinter(printer *Printer, opts string) error {
 	printer.printerType = PrinterTypeTemplate
 	if opts == "" {
 		return &CliError{
-			Err:     fmt.Errorf("cannot use a template output with an empty template"),
+			Err:     errors.New("cannot use a template output with an empty template"),
 			Hint:    `Try using golang template string: scw instance server list -o template="{{ .ID }} ☜(˚▽˚)☞ {{ .Name }}"`,
 			Details: `https://golang.org/pkg/text/template`,
 		}
@@ -185,7 +186,7 @@ func (p *Printer) printHuman(data interface{}, opt *human.MarshalOpt) error {
 		}
 
 		if len(p.humanFields) > 0 && reflect.TypeOf(data).Kind() != reflect.Slice {
-			return p.printHuman(fmt.Errorf("list of fields for human output is only supported for commands that return a list"), nil)
+			return p.printHuman(errors.New("list of fields for human output is only supported for commands that return a list"), nil)
 		}
 
 		if len(p.humanFields) > 0 {
@@ -203,7 +204,7 @@ func (p *Printer) printHuman(data interface{}, opt *human.MarshalOpt) error {
 	case *human.UnknownFieldError:
 		return p.printHuman(&CliError{
 			Err:  fmt.Errorf("unknown field '%s' in output options", e.FieldName),
-			Hint: fmt.Sprintf("Valid fields are: %s", strings.Join(e.ValidFields, ", ")),
+			Hint: "Valid fields are: " + strings.Join(e.ValidFields, ", "),
 		}, nil)
 	case nil:
 		// Do nothing
@@ -299,7 +300,7 @@ func (p *Printer) printTemplate(data interface{}) error {
 				return p.printHuman(&CliError{
 					Err:     err,
 					Message: "templating error",
-					Hint:    fmt.Sprintf("Acceptable values are:\n  - %s", strings.Join(gofields.ListFields(elemValue.Type()), "\n  - ")),
+					Hint:    "Acceptable values are:\n  - " + strings.Join(gofields.ListFields(elemValue.Type()), "\n  - "),
 				}, nil)
 			}
 			_, err = writer.Write([]byte{'\n'})

internal/core/reflect.go

@@ -114,5 +114,5 @@ func GetValuesForFieldByName(value reflect.Value, parts []string) (values []refl
 
 		return nil, fmt.Errorf("field %v does not exist for %v", fieldName, value.Type().Name())
 	}
-	return nil, fmt.Errorf("case is not handled")
+	return nil, errors.New("case is not handled")
 }