python-tools

import { readFile, writeFile } from "node:fs/promises";
import path from "node:path";

export interface PythonToolsConfig {
  pythonExecutablePath?: string;
}

const CONFIG_FILE_NAME = ".python-tools-config.json";

export function getPythonToolsConfigPath(): string {
  return path.join(process.cwd(), CONFIG_FILE_NAME);
}

export async function readPythonToolsConfig(): Promise<PythonToolsConfig> {
  try {
    const rawConfig = await readFile(getPythonToolsConfigPath(), "utf8");
    const parsedConfig: unknown = JSON.parse(rawConfig);

    if (!isConfigObject(parsedConfig)) {
      return {};
    }

    if (typeof parsedConfig.pythonExecutablePath !== "string") {
      return {};
    }

    return {
      pythonExecutablePath: parsedConfig.pythonExecutablePath,
    };
  } catch (error) {
    if (isNodeError(error) && error.code === "ENOENT") {
      return {};
    }

    return {};
  }
}

export async function writePythonToolsConfig(config: PythonToolsConfig): Promise<void> {
  const configJson = `${JSON.stringify(config, null, 2)}\n`;
  await writeFile(getPythonToolsConfigPath(), configJson, "utf8");
}

function isConfigObject(value: unknown): value is { pythonExecutablePath?: unknown } {
  return typeof value === "object" && value !== null && !Array.isArray(value);
}

function isNodeError(error: unknown): error is NodeJS.ErrnoException {
  return error instanceof Error;
}