vmkteam labs
Table of contents

Here’s my code review with recommendations for improvements:

General Observations

The code is well-structured and follows many Go idioms. However, there are some areas that could be improved for better readability, maintainability, and idiomatic Go practices.

Documentation Improvements

Several exported functions and types are missing documentation. Here are the recommended additions:

// Config represents the configuration for the colgen tool including API keys for different AI assistants.
type Config struct {
    DeepSeekKey string // API key for DeepSeek assistant
    ClaudeKey   string // API key for Claude assistant
}

// fillByAssistName sets the API key for the specified assistant name.
// Returns error if config is nil or assistant name is unknown.
func (cfg *Config) fillByAssistName(name colgen.AssistantName, key string) error

// keyByName returns the API key for the specified assistant name.
// Returns empty string if assistant name is unknown.
func (cfg *Config) keyByName(name colgen.AssistantName) string

// exitOnErr logs the error and exits the program if error is not nil.
// Should be used for fatal errors that prevent the program from continuing.
func exitOnErr(err error)

// assistFile processes a file using the specified AI assistant based on the configuration.
// It handles both normal generation cases and test generation cases differently.
func assistFile(cfg Config, assistPrompt, filename string)

// extractAIPrompts extracts AI mode and name from the assistant prompt string.
// Returns mode, assistant name, and error if parsing fails.
// Defaults to "deepseek" assistant if not specified.
func extractAIPrompts(aiPrompt string) (mode colgen.AssistMode, name colgen.AssistantName, err error)

// replaceFile replaces content in the target file based on injection rules.
func replaceFile(cl colgenLines, filename string)

// generateFile generates new code based on colgen rules and writes it to a new file.
func generateFile(cl colgenLines, filename string)

// readFile parses a file line by line and returns all colgen-related lines.
// It extracts package name, assistant instructions, injection rules, and normal colgen rules.
func readFile(filename string) (result colgenLines, err error)

// baseName returns the base name from path without extension.
func baseName(path string) string

// appVersion returns the application version from VCS info.
// Returns "devel" if version information cannot be determined.
func appVersion() string

// writeConfig creates or updates the configuration file in the user's home directory.
// It preserves existing keys while updating the specified assistant's key.
func writeConfig(key string, name colgen.AssistantName) error

// configPath gets the path to the configuration file in the user's home directory.
func configPath() (string, error)

// readConfig reads the configuration from the default location in the user's home directory.
// Returns an empty config if the file doesn't exist.
func readConfig() (Config, error)

Code Improvements

  1. Error Handling:
    • Consider using fmt.Errorf with %w for wrapping errors consistently
    • Example improvement:
// Current
if err != nil {
    return fmt.Errorf("create config failed: %w", err)
}

// Suggested
if err != nil {
    return fmt.Errorf("failed to create config: %w", err)
}
  1. String Handling:
    • Use strings.TrimSpace() when processing user input
    • Example:
// Current
aiPrompt = strings.ReplaceAll(aiPrompt, " ", "")

// Suggested
aiPrompt = strings.TrimSpace(aiPrompt)
  1. File Operations:
    • Consider using os.OpenFile with proper flags instead of os.WriteFile when you need more control
    • Example improvement:
// Current
err = os.WriteFile(filename, content, os.ModePerm)

// Suggested
err = os.WriteFile(filename, content, 0644) // More standard permission
  1. Constants:
    • Consider grouping related constants:
const (
    configFile = ".colgen"
    defaultAssistant = colgen.AssistantDeepSeek
)

  1. Early Returns:

    • The code already uses early returns well, which is good Go practice

  2. Variable Naming:

    • Some variable names could be more descriptive:
      • cl → colgenLines or fileContent
      • am → assistMode
      • an → assistantName

  3. Error Messages:

    • Make error messages more consistent and actionable
    • Example improvement:
// Current
log.Fatal("GOFILE environment variable is not set. Run via `go generate`")

// Suggested
log.Fatal("GOFILE environment variable not set - must be run via 'go generate'")
  1. Testing:
    • While not shown in the code, consider adding table-driven tests for functions like extractAIPrompts

Structural Improvements

  1. Config Handling:
    • Consider making config methods more consistent:
func (cfg *Config) SetKeyForAssistant(name colgen.AssistantName, key string) error
func (cfg Config) KeyForAssistant(name colgen.AssistantName) string
  1. File Processing:
    • The colgenLines struct could benefit from methods:
func (cl *colgenLines) AddLine(line string)
func (cl colgenLines) HasContent() bool
  1. Version Handling:
    • Consider making version a package-level variable:
var version = "devel"

func init() {
    if info, ok := debug.ReadBuildInfo(); ok && info.Main.Version != "" {
        version = info.Main.Version
    }
}

func Version() string {
    return version
}

Performance Considerations

  1. File Reading:
    • For large files, consider using bufio.NewReader instead of Scanner
  2. String Operations:
    • For many string replacements, consider using strings.Builder

Conclusion

The code is generally well-written and follows Go idioms. The main areas for improvement are:

  1. Adding complete documentation for all exported types and functions
  2. Making error handling and messages more consistent
  3. Improving some variable names for clarity
  4. Adding more structure to configuration handling
  5. Considering small performance optimizations for file operations

Would you like me to elaborate on any of these recommendations or provide more specific code examples for any particular area?