backstage

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/*
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 * Copyright 2020 The Backstage Authors
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 *
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * you may not use this file except in compliance with the License.
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 * You may obtain a copy of the License at
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 *
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 *     http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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import { relative as relativePath } from 'path';
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import { spawn } from 'child_process';
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import { OptionValues } from 'commander';
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import { findPaths } from '@backstage/cli-common';
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import { platform } from 'os';
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import { ExitCodeError } from './errors';
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// eslint-disable-next-line no-restricted-syntax
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const paths = findPaths(__dirname);
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export function createCodemodAction(name: string) {
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  return async (dirs: string[], opts: OptionValues) => {
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    const transformPath = relativePath(
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      process.cwd(),
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      paths.resolveOwn('transforms', `${name}.js`),
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    );
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    const args = [
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      '--parser=tsx',
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      '--extensions=tsx,js,ts,tsx',
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      '--transform',
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      transformPath,
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      '--ignore-pattern=**/node_modules/**',
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    ];
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    if (opts.dry) {
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      args.push('--dry');
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    }
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    if (dirs.length) {
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      args.push(...dirs);
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    } else {
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      args.push('.');
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    }
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    console.log(`Running jscodeshift with these arguments: ${args.join(' ')}`);
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    let command;
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    if (platform() === 'win32') {
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      command = 'jscodeshift';
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    } else {
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      // jscodeshift ships a slightly broken bin script with windows
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      // line endings so we need to execute it using node rather than
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      // letting the `#!/usr/bin/env node` take care of it
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      command = process.argv0;
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      args.unshift(require.resolve('.bin/jscodeshift'));
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    }
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    const child = spawn(command, args, {
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      stdio: 'inherit',
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      shell: true,
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      env: {
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        ...process.env,
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        FORCE_COLOR: 'true',
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      },
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    });
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    if (typeof child.exitCode === 'number') {
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      if (child.exitCode) {
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        throw new ExitCodeError(child.exitCode, name);
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      }
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      return;
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    }
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    await new Promise<void>((resolve, reject) => {
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      child.once('error', error => reject(error));
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      child.once('exit', code => {
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        if (code) {
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          reject(new ExitCodeError(code, name));
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        } else {
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          resolve();
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        }
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      });
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    });
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  };
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}
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