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// Summary: Application configuration model and loader; reads ~/.config/hexai/config.json and merges defaults.
package appconfig
import (
"encoding/json"
"fmt"
"log"
"os"
"path/filepath"
"slices"
"strings"
)
// App holds user-configurable settings read from ~/.config/hexai/config.json.
type App struct {
MaxTokens int `json:"max_tokens"`
ContextMode string `json:"context_mode"`
ContextWindowLines int `json:"context_window_lines"`
MaxContextTokens int `json:"max_context_tokens"`
LogPreviewLimit int `json:"log_preview_limit"`
TriggerCharacters []string `json:"trigger_characters"`
Provider string `json:"provider"`
// Provider-specific options
OpenAIBaseURL string `json:"openai_base_url"`
OpenAIModel string `json:"openai_model"`
OllamaBaseURL string `json:"ollama_base_url"`
OllamaModel string `json:"ollama_model"`
CopilotBaseURL string `json:"copilot_base_url"`
CopilotModel string `json:"copilot_model"`
}
func newDefaultConfig() App {
return App{
MaxTokens: 4000,
ContextMode: "always-full",
ContextWindowLines: 120,
MaxContextTokens: 4000,
LogPreviewLimit: 100,
}
}
func loadFromFile(path string, logger *log.Logger) (*App, error) {
f, err := os.Open(path)
if err != nil {
if !os.IsNotExist(err) && logger != nil {
logger.Printf("cannot open config file %s: %v", path, err)
}
return nil, err
}
defer f.Close()
dec := json.NewDecoder(f)
var fileCfg App
if err := dec.Decode(&fileCfg); err != nil {
if logger != nil {
logger.Printf("invalid config file %s: %v", path, err)
}
return nil, err
}
return &fileCfg, nil
}
func (a *App) mergeWith(other *App) {
if other.MaxTokens > 0 {
a.MaxTokens = other.MaxTokens
}
if strings.TrimSpace(other.ContextMode) != "" {
a.ContextMode = other.ContextMode
}
if other.ContextWindowLines > 0 {
a.ContextWindowLines = other.ContextWindowLines
}
if other.MaxContextTokens > 0 {
a.MaxContextTokens = other.MaxContextTokens
}
if other.LogPreviewLimit >= 0 {
a.LogPreviewLimit = other.LogPreviewLimit
}
if len(other.TriggerCharacters) > 0 {
a.TriggerCharacters = slices.Clone(other.TriggerCharacters)
}
if strings.TrimSpace(other.Provider) != "" {
a.Provider = other.Provider
}
if strings.TrimSpace(other.OpenAIBaseURL) != "" {
a.OpenAIBaseURL = other.OpenAIBaseURL
}
if strings.TrimSpace(other.OpenAIModel) != "" {
a.OpenAIModel = other.OpenAIModel
}
if strings.TrimSpace(other.OllamaBaseURL) != "" {
a.OllamaBaseURL = other.OllamaBaseURL
}
if strings.TrimSpace(other.OllamaModel) != "" {
a.OllamaModel = other.OllamaModel
}
if strings.TrimSpace(other.CopilotBaseURL) != "" {
a.CopilotBaseURL = other.CopilotBaseURL
}
if strings.TrimSpace(other.CopilotModel) != "" {
a.CopilotModel = other.CopilotModel
}
}
// Load reads configuration from a file and merges with defaults.
// It respects the XDG Base Directory Specification.
func Load(logger *log.Logger) App {
cfg := newDefaultConfig()
if logger == nil {
return cfg // Return defaults if no logger is provided (e.g. in tests)
}
configPath, err := getConfigPath()
if err != nil {
logger.Printf("%v", err)
return cfg
}
fileCfg, err := loadFromFile(configPath, logger)
if err != nil {
return cfg
}
cfg.mergeWith(fileCfg)
return cfg
}
func getConfigPath() (string, error) {
var configPath string
if xdgConfigHome := os.Getenv("XDG_CONFIG_HOME"); xdgConfigHome != "" {
configPath = filepath.Join(xdgConfigHome, "hexai", "config.json")
} else {
home, err := os.UserHomeDir()
if err != nil {
return "", fmt.Errorf("cannot find user home directory: %v", err)
}
configPath = filepath.Join(home, ".config", "hexai", "config.json")
}
return configPath, nil
}
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