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config.go
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config.go
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package utils
import (
"fmt"
"os"
"path"
"path/filepath"
"reflect"
"github.com/baalimago/go_away_boilerplate/pkg/ancli"
"github.com/baalimago/go_away_boilerplate/pkg/misc"
)
func createConfigDir(configDirPath string) error {
if _, err := os.Stat(configDirPath); os.IsNotExist(err) {
err := setupClaiConfigDir(configDirPath)
if err != nil {
return fmt.Errorf("failed to setup config dotdir: %w", err)
}
}
return nil
}
func setupClaiConfigDir(configPath string) error {
conversationsDir := filepath.Join(configPath, "conversations")
ancli.PrintOK("created conversations directory\n")
// Create the .clai directory.
if err := os.MkdirAll(conversationsDir, os.ModePerm); err != nil {
return fmt.Errorf("failed to create .clai + .clai/conversations directory: %w", err)
}
ancli.PrintOK(fmt.Sprintf("created .clai directory at: '%v'\n", configPath))
return nil
}
func createDefaultConfigFile[T any](configDirPath, configFileName string, dflt *T) error {
configFilePath := filepath.Join(configDirPath, configFileName)
if _, err := os.Stat(configFilePath); os.IsNotExist(err) {
if misc.Truthy(os.Getenv("DEBUG")) {
ancli.PrintOK(fmt.Sprintf("attempting to create file: '%v'\n", configFilePath))
}
err := CreateFile(configFilePath, dflt)
if err != nil {
return fmt.Errorf("failed to write config: '%v', error: %w", configFileName, err)
}
}
return nil
}
func runMigrationCallback(migrationCb func(string) error, configDirPath string) error {
if migrationCb != nil {
err := migrationCb(configDirPath)
if err != nil {
ancli.PrintWarn(fmt.Sprintf("failed to migrate for config, error: %v\n", err))
return err
}
}
return nil
}
func LoadConfigFromFile[T any](
placeConfigPath,
configFileName string,
migrationCb func(string) error,
dflt *T,
) (T, error) {
configDirPath := fmt.Sprintf("%v/.clai/", placeConfigPath)
if misc.Truthy(os.Getenv("DEBUG")) {
ancli.PrintOK(fmt.Sprintf("attempting to load file: %v%v\n", configDirPath, configFileName))
}
err := createConfigDir(configDirPath)
if err != nil {
var nilVal T
return nilVal, err
}
err = createDefaultConfigFile(configDirPath, configFileName, dflt)
if err != nil {
var nilVal T
return nilVal, err
}
err = runMigrationCallback(migrationCb, configDirPath)
if err != nil {
var nilVal T
return nilVal, err
}
configPath := path.Join(configDirPath, configFileName)
var conf T
err = ReadAndUnmarshal(configPath, &conf)
if err != nil {
return conf, fmt.Errorf("failed to unmarshal config '%v', error: %v", configFileName, err)
}
// Append any new fields from defauly config, in case of config extension
hasChanged := setNonZeroValueFields(&conf, dflt)
if hasChanged {
err = CreateFile(configPath, &conf)
if err != nil {
return conf, fmt.Errorf("failed to write config '%v' post zero-field appendage, error: %v", configFileName, err)
}
ancli.PrintOK(fmt.Sprintf("appended new fields to textConfig and updated config file: %v\n", configPath))
}
if misc.Truthy(os.Getenv("DEBUG")) {
ancli.PrintOK(fmt.Sprintf("found config: %+v\n", conf))
}
return conf, nil
}
// setNonZeroValueFields on a using b as template
func setNonZeroValueFields[T any](a, b *T) bool {
hasChanged := false
t := reflect.TypeOf(*a)
for i := range t.NumField() {
f := t.Field(i)
aVal := reflect.ValueOf(a).Elem().FieldByName(f.Name)
bVal := reflect.ValueOf(b).Elem().FieldByName(f.Name)
if f.IsExported() && aVal.IsZero() && !bVal.IsZero() {
hasChanged = true
aVal.Set(bVal)
}
}
return hasChanged
}
func ReturnNonDefault[T comparable](a, b, defaultVal T) (T, error) {
if a != defaultVal && b != defaultVal {
return defaultVal, fmt.Errorf("values are mutually exclusive")
}
if a != defaultVal {
return a, nil
}
if b != defaultVal {
return b, nil
}
return defaultVal, nil
}