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import * as fs from 'fs';
import {exec} from 'child_process';
import * as util from 'util';
const execAsync = util.promisify(exec);
const COMMIT = 'commit';
const PULL = 'pull';
const defaultIgnore = ['.git', '.template'];
type Any = {};
export interface ConfigJson {
name: string;
ignoreKeys: string[];
}
export interface Config {
source: string;
ignore: string[];
json?: ConfigJson[];
}
export class Template {
static execAsync = execAsync;
static async readJson(filePath: string) {
try {
const content = await fs.promises.readFile(filePath, 'utf8');
return JSON.parse(content);
} catch (e) {
return {};
}
}
static async readGitIgnore(filePath: string): Promise<string[]> {
try {
const content = await fs.promises.readFile(filePath, 'utf8');
return content.split('\n').filter(i => i);
} catch (e) {
return [];
}
}
static async config(location: string): Promise<Config> {
const configPath = path.join(location, 'template.json');
const ignorePath = path.join(location, '.gitignore');
const config = await Template.readJson(configPath);
const gitignore = await Template.readGitIgnore(ignorePath);
if (!config.source) throw new Error('config is missing source');
const ignoreJson = (config.json || []).map((j: ConfigJson) => j.name);
const ignore = [
...gitignore,
...ignoreJson,
...defaultIgnore,
...(config.ignore || []),
];
return {...config, ignore} as Config;
}
static async files(location: string, ignore: string[]) {
const files: string[] = [];
const recursive = async (location: string) => {
const entries = await fs.promises.readdir(location, {
withFileTypes: true,
});
const promises = entries.map(async entry => {
if (ignore.includes(entry.name)) return;
const fullLocation = path.join(location, entry.name);
if (entry.isDirectory()) {
await recursive(fullLocation);
} else {
files.push(fullLocation);
}
});
await Promise.all(promises);
};
await recursive(location);
return files;
}
static async rmdir(location: string) {
const entries = await fs.promises.readdir(location, {withFileTypes: true});
const promises = entries.map(entry => {
const fullLocation = path.join(location, entry.name);
return entry.isDirectory()
? Template.rmdir(fullLocation)
: fs.promises.unlink(fullLocation);
});
await Promise.all(promises);
await fs.promises.rmdir(location);
}
static async mkdirp(location: string) {
location = path.resolve(location);
const locationSplit = location.split(path.sep);
return locationSplit
.map((i, index) => {
return path.join('/', ...locationSplit.slice(0, index + 1));
})
.filter(i => i !== '/')
.reduce((resolve, segment) => {
return resolve.then(async () => {
try {
await fs.promises.stat(segment);
} catch (e) {
await fs.promises.mkdir(segment);
}
});
}, Promise.resolve());
}
static async clone(repo: string, location: string) {
try {
const templateDir = path.join(location, '.template');
await Template.rmdir(templateDir);
} catch (e) {
// noop
}
return execAsync(`git -C ${location} clone ${repo} .template`);
}
static templateFile(file: string, location: string) {
const chopped = file.replace(new RegExp(`^${location}`), '');
return path.join(location, path.join('.template', chopped));
}
static normalFile(
templateFile: string,
templateDir: string,
location: string
) {
const chopped = templateFile.replace(new RegExp(`^${templateDir}`), '');
return path.join(location, chopped);
}
static omit(keys: string[], obj: {[key: string]: Any}): {[key: string]: Any} {
return Object.keys(obj).reduce((prev, curr) => {
const value = obj[curr];
if (!keys.includes(curr)) return {...prev, [curr]: value};
return prev;
}, {});
}
static deepMerge(target: {[key: string]: Any}, source: {[key: string]: Any}) {
for (const key of Object.keys(source)) {
if (source[key] instanceof Object) {
Object.assign(
source[key],
Template.deepMerge(target[key], source[key])
);
}
}
// Join `target` and modified `source`
Object.assign(target, source);
return target;
}
static async mergeJson(json: Config['json'], location: string, cmd: string) {
const jsonFiles = json || [];
const promises = jsonFiles.map(async jsonFile => {
const {ignoreKeys} = jsonFile;
const file = path.join(location, jsonFile.name);
const templateFile = Template.templateFile(file, location);
const fileJSON = await Template.readJson(file);
const templateFileJSON = await Template.readJson(templateFile);
const iFileJSON = Template.omit(ignoreKeys, fileJSON);
const iTemplateFileJSON = Template.omit(ignoreKeys, templateFileJSON);
if (cmd === COMMIT) {
const json = Template.deepMerge(templateFileJSON, iFileJSON);
const output = JSON.stringify(json, null, 2);
await Template.mkdirp(path.dirname(templateFile));
await fs.promises.writeFile(templateFile, output, 'utf-8');
}
if (cmd === PULL) {
const json = Template.deepMerge(fileJSON, iTemplateFileJSON);
const output = JSON.stringify(json, null, 2);
await Template.mkdirp(path.dirname(file));
await fs.promises.writeFile(file, output, 'utf-8');
}
});
await Promise.all(promises);
}
static async main(location: string, cmd: string) {
const {source, ignore, json} = await Template.config(location);
await Template.clone(source, location);
await Template.mergeJson(json, location, cmd);
if (cmd === COMMIT) {
const files = await Template.files(location, ignore);
const promises = files.map(async file => {
const templateFile = Template.templateFile(file, location);
await Template.mkdirp(path.dirname(templateFile));
await fs.promises.copyFile(file, templateFile);
});
return await Promise.all(promises);
}
if (cmd === PULL) {
const templateDir = path.join(location, '.template');
const files = await Template.files(templateDir, ignore);
const promises = files.map(async templateFile => {
const file = Template.normalFile(templateFile, templateDir, location);
await Template.mkdirp(path.dirname(file));
await fs.promises.copyFile(templateFile, file);
});
return Promise.all(promises);
}
throw new Error('invalid sub-command');
}
static async cli(process: NodeJS.Process) {
const location = process.cwd();
const cmd = process.argv.slice(2)[0];
try {
await Template.main(location, cmd);
process.exit(0);
} catch (e) {
process.stderr.write(e.message + '\n');
process.exit(1);
}
}
}
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