Apply Google Style Guide & performance optimizations

Author: tstromberg

README.md

@@ -2,7 +2,6 @@
 
 [![Release](https://img.shields.io/github/release/codeGROOVE-dev/retry-go.svg?style=flat-square)](https://github.com/codeGROOVE-dev/retry-go/releases/latest)
 [![Software License](https://img.shields.io/badge/license-MIT-brightgreen.svg?style=flat-square)](LICENSE.md)
-![GitHub Actions](https://github.com/codeGROOVE-dev/retry-go/actions/workflows/workflow.yaml/badge.svg)
 [![Go Report Card](https://goreportcard.com/badge/github.com/codeGROOVE-dev/retry-go?style=flat-square)](https://goreportcard.com/report/github.com/codeGROOVE-dev/retry-go)
 [![Go Reference](https://pkg.go.dev/badge/github.com/codeGROOVE-dev/retry-go.svg)](https://pkg.go.dev/github.com/codeGROOVE-dev/retry-go)
 
@@ -26,6 +25,8 @@ This fork retains the original v4 API provided by the retry-go codebase, and is
 
 # SYNOPSIS
 
+For full package documentation, see https://pkg.go.dev/github.com/codeGROOVE-dev/retry-go
+
 HTTP GET with retry:
 
     url := "http://example.com"
@@ -80,6 +81,8 @@ HTTP GET with retry with data:
 
 [More examples](https://github.com/codeGROOVE-dev/retry-go/tree/master/examples)
 
+
+
 # SEE ALSO
 
 * [giantswarm/retry-go](https://github.com/giantswarm/retry-go) - slightly
@@ -102,16 +105,8 @@ nonintuitive interface (for me)
 
 Contributions are very much welcome.
 
-### Makefile
-
-Makefile provides several handy rules, like README.md `generator` , `setup` for prepare build/dev environment, `test`, `cover`, etc...
-
-Try `make help` for more information.
-
 ### Before pull request
 
-> maybe you need `make setup` in order to setup environment
-
 please try:
 * run tests (`make test`)
 * run linter (`make lint`)

options.go

@@ -20,12 +20,19 @@ type OnRetryFunc func(attempt uint, err error)
 // The attempt parameter is the zero-based index of the attempt.
 type DelayTypeFunc func(attempt uint, err error, config *Config) time.Duration
 
-// Timer represents the timer used to track time for a retry.
+// Timer provides an interface for time operations in retry logic.
+// This abstraction allows for mocking time in tests and implementing
+// custom timing behaviors. The standard implementation uses time.After.
 type Timer interface {
+	// After returns a channel that sends the current time after the duration elapses.
+	// It should behave like time.After.
 	After(time.Duration) <-chan time.Time
 }
 
-// Config contains all retry configuration.
+// Config holds all configuration options for retry behavior.
+// It is typically populated using Option functions and should not be
+// constructed directly. Use the various Option functions like Attempts,
+// Delay, and RetryIf to configure retry behavior.
 type Config struct {
 	attempts                      uint
 	attemptsForError              map[error]uint
@@ -36,9 +43,9 @@ type Config struct {
 	retryIf                       RetryIfFunc
 	delayType                     DelayTypeFunc
 	lastErrorOnly                 bool
-	context                       context.Context
-	timer                         Timer
-	wrapContextErrorWithLastError bool
+	context     context.Context
+	timer       Timer
+	wrapLastErr bool // wrap context error with last function error
 
 	maxBackOffN uint
 }
@@ -58,10 +65,10 @@ func (c *Config) validate() error {
 
 	// Ensure we have required functions
 	if c.retryIf == nil {
-		return fmt.Errorf("retryIf function cannot be nil")
+		return fmt.Errorf("retry if function cannot be nil")
 	}
 	if c.delayType == nil {
-		return fmt.Errorf("delayType function cannot be nil")
+		return fmt.Errorf("delay type function cannot be nil")
 	}
 	if c.timer == nil {
 		return fmt.Errorf("timer cannot be nil")
@@ -73,7 +80,9 @@ func (c *Config) validate() error {
 	return nil
 }
 
-// Option represents an option for retry.
+// Option configures retry behavior. Options are applied in the order provided
+// to Do or DoWithData. Later options override earlier ones if they modify the
+// same configuration field.
 type Option func(*Config)
 
 func emptyOption(c *Config) {}
@@ -380,8 +389,8 @@ func WithTimer(t Timer) Option {
 //		retry.Attempts(0),
 //		retry.WrapContextErrorWithLastError(true),
 //	)
-func WrapContextErrorWithLastError(wrapContextErrorWithLastError bool) Option {
+func WrapContextErrorWithLastError(wrap bool) Option {
 	return func(c *Config) {
-		c.wrapContextErrorWithLastError = wrapContextErrorWithLastError
+		c.wrapLastErr = wrap
 	}
 }

retry.go

@@ -180,14 +180,21 @@ func DoWithData[T any](retryableFunc RetryableFuncWithData[T], opts ...Option) (
 		}
 		attempt++
 
-		// Wait for next attempt
-		delayDuration := delay(config, attempt, err)
+		// Wait for next attempt - inline delay calculation for performance
+		delayTime := config.delayType(attempt, err, config)
+		if delayTime < 0 {
+			delayTime = 0
+		}
+		if config.maxDelay > 0 && delayTime > config.maxDelay {
+			delayTime = config.maxDelay
+		}
+		
 		select {
-		case <-config.timer.After(delayDuration):
+		case <-config.timer.After(delayTime):
 		case <-config.context.Done():
 			contextErr := context.Cause(config.context)
 			if config.lastErrorOnly {
-				if config.wrapContextErrorWithLastError && err != nil {
+				if config.wrapLastErr && err != nil {
 					return emptyT, fmt.Errorf("%w: %w", contextErr, err)
 				}
 				return emptyT, contextErr
@@ -228,14 +235,25 @@ type Error []error
 // Error returns a string representation of all errors that occurred during retry attempts.
 // Each error is prefixed with its attempt number.
 func (e Error) Error() string {
-	logWithNumber := make([]string, len(e))
+	if len(e) == 0 {
+		return "All attempts fail:"
+	}
+	
+	// Use strings.Builder for efficient string concatenation
+	var b strings.Builder
+	b.WriteString("All attempts fail:")
+	
 	for i, err := range e {
 		if err != nil {
-			logWithNumber[i] = fmt.Sprintf("#%d: %s", i+1, err.Error())
+			b.WriteByte('\n')
+			b.WriteByte('#')
+			b.WriteString(fmt.Sprint(i + 1))
+			b.WriteString(": ")
+			b.WriteString(err.Error())
 		}
 	}
-
-	return fmt.Sprintf("All attempts fail:\n%s", strings.Join(logWithNumber, "\n"))
+	
+	return b.String()
 }
 
 // Is reports whether any error in e matches target.
@@ -315,30 +333,14 @@ func IsRecoverable(err error) bool {
 // Is implements error matching for unrecoverableError.
 // It supports errors.Is by checking if the target is also an unrecoverableError.
 func (unrecoverableError) Is(err error) bool {
-	_, isUnrecoverable := err.(unrecoverableError)
-	return isUnrecoverable
+	_, ok := err.(unrecoverableError)
+	return ok
 }
 
 func unpackUnrecoverable(err error) error {
-	if unrecoverable, isUnrecoverable := err.(unrecoverableError); isUnrecoverable {
-		return unrecoverable.error
+	if u, ok := err.(unrecoverableError); ok {
+		return u.error
 	}
-
 	return err
 }
 
-func delay(config *Config, attempt uint, err error) time.Duration {
-	delayTime := config.delayType(attempt, err, config)
-	
-	// Ensure delay is non-negative
-	if delayTime < 0 {
-		delayTime = 0
-	}
-	
-	// Apply max delay cap if configured
-	if config.maxDelay > 0 && delayTime > config.maxDelay {
-		delayTime = config.maxDelay
-	}
-
-	return delayTime
-}