/**
* Template Loader Utility
*
* Centralizes template file loading from src/ directory.
* Handles both development (src/) and production (dist/) paths.
*
* Replaces duplicate template loading patterns in deployments.ts
*/
import * as fs from 'fs';
import * as path from 'path';
// Lazily computed source directory path
let _srcDir: string | null = null;
/**
* Resolve the src/ directory path.
* Works from both src/ (development) and dist/ (compiled) contexts.
*/
function resolveSrcDir(): string {
if (_srcDir !== null) {
return _srcDir;
}
// Get the directory of this file
const currentDir = path.dirname(new URL(import.meta.url).pathname);
// Determine if we're running from compiled code (dist/) or source code (src/)
if (currentDir.includes('/dist/')) {
// Running from compiled code: dist/src/utils -> go up to project root, then to src
const projectRoot = currentDir.replace(/\/dist\/.*$/, '');
_srcDir = path.join(projectRoot, 'src');
} else {
// Running from source code: src/utils -> go up to src
_srcDir = path.join(currentDir, '..');
}
return _srcDir;
}
/**
* Load a template file from the src/ directory.
*
* @param filename - Filename relative to src/ (e.g., '__mcp_exec.js', 'appsscript.json')
* @returns File content as string
* @throws Error if file cannot be read
*/
export function loadTemplate(filename: string): string {
try {
const srcDir = resolveSrcDir();
const templatePath = path.join(srcDir, filename);
return fs.readFileSync(templatePath, 'utf8');
} catch (error) {
console.error(`Error reading template ${filename}:`, error);
throw new Error(`Failed to read template ${filename}: ${error instanceof Error ? error.message : String(error)}`);
}
}
/**
* Load and parse a JSON template file from the src/ directory.
*
* @param filename - JSON filename relative to src/ (e.g., 'appsscript.json')
* @returns Parsed JSON object
* @throws Error if file cannot be read or parsed
*/
export function loadJsonTemplate<T = any>(filename: string): T {
try {
const content = loadTemplate(filename);
return JSON.parse(content) as T;
} catch (error) {
if (error instanceof SyntaxError) {
throw new Error(`Failed to parse JSON template ${filename}: ${error.message}`);
}
throw error;
}
}
/**
* Get the resolved src/ directory path.
* Useful for debugging or path construction.
*/
export function getSrcDir(): string {
return resolveSrcDir();
}
