✨ feat(config.ts): add caching mechanism to reduce file I/O operations

A caching mechanism has been added to the getConfig function to improve performance by reducing the number of file I/O operations. The function now checks if the configCache variable is enabled and returns the cached value if it is. If the cache is not enabled, the function reads the configuration file and returns the value. After reading the configuration file, the function stores the value in the cache for future use.

Author: takuya-o

src/commands/config.ts

@@ -11,6 +11,7 @@ import { getI18nLocal } from '../i18n';
 import * as dotenv from 'dotenv';
 
 dotenv.config();
+let configCache:ConfigType | null = null;
 
 export enum CONFIG_KEYS {
   OCO_OPENAI_API_KEY = 'OCO_OPENAI_API_KEY',
@@ -134,6 +135,9 @@ export type ConfigType = {
 const configPath = pathJoin(homedir(), '.opencommit');
 
 export const getConfig = (): ConfigType | null => {
+  // If it is enable, use configCache
+  if (configCache) return configCache;
+
   const configFromEnv = {
     OCO_OPENAI_API_KEY: process.env.OCO_OPENAI_API_KEY,
     OCO_OPENAI_MAX_TOKENS: process.env.OCO_OPENAI_MAX_TOKENS ? Number(process.env.OCO_OPENAI_MAX_TOKENS) : undefined,
@@ -145,7 +149,10 @@ export const getConfig = (): ConfigType | null => {
   };
 
   const configExists = existsSync(configPath);
-  if (!configExists) return configFromEnv;
+  if (!configExists) {
+    configCache = configFromEnv;
+    return configFromEnv;
+  }
 
   const configFile = readFileSync(configPath, 'utf8');
   const config = iniParse(configFile);
@@ -173,6 +180,8 @@ export const getConfig = (): ConfigType | null => {
     }
   }
 
+  // Store configCache
+  configCache = config
   return config;
 };