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// Utility functions which are only relevant to particular Node.js constructs.
import {readdir, stat} from 'fs/promises';
import {fileURLToPath} from 'url';
import * as path from 'path';
import _commandExists from 'command-exists';
// This package throws an error instead of returning false when the command
// doesn't exist, for some reason. Yay for making logic more difficult!
// Here's a straightforward workaround.
export function commandExists(command) {
return _commandExists(command).then(
() => true,
() => false
);
}
// Very cool function origin8ting in... http-music pro8a8ly!
// Sorry if we happen to 8e violating past-us's copyright, lmao.
export function promisifyProcess(proc, showLogging = true) {
// Takes a process (from the child_process module) and returns a promise
// that resolves when the process exits (or rejects, if the exit code is
// non-zero).
//
// Ayy look, no alpha8etical second letter! Couldn't tell this was written
// like three years ago 8efore I was me. 8888)
return new Promise((resolve, reject) => {
if (showLogging) {
proc.stdout.pipe(process.stdout);
proc.stderr.pipe(process.stderr);
}
proc.on('exit', (code) => {
if (code === 0) {
resolve();
} else {
reject(code);
}
});
});
}
// Handy-dandy utility function for detecting whether the passed URL is the
// running JavaScript file. This takes `import.meta.url` from ES6 modules, which
// is great 'cuz (module === require.main) doesn't work without CommonJS
// modules.
export function isMain(importMetaURL) {
const metaPath = fileURLToPath(importMetaURL);
const relative = path.relative(process.argv[1], metaPath);
const isIndexJS = path.basename(metaPath) === 'index.js';
return [
'',
isIndexJS && 'index.js'
].includes(relative);
}
// Like readdir... but it's recursive! This returns a flat list of file paths.
// By default, the paths include the provided top/root path, but this can be
// changed with prefixPath to prefix some other path, or to just return paths
// relative to the root. Change pathStyle to specify posix or win32, or leave
// it as the default device-correct style. Provide a filterDir function to
// control which directory names are traversed at all, and filterFile to
// select which filenames are included in the final list.
export async function traverse(rootPath, {
pathStyle = 'device',
filterFile = () => true,
filterDir = () => true,
prefixPath = rootPath,
} = {}) {
const pathJoinDevice = path.join;
const pathJoinStyle = {
'device': path.join,
'posix': path.posix.join,
'win32': path.win32.join,
}[pathStyle];
if (!pathJoinStyle) {
throw new Error(`Expected pathStyle to be device, posix, or win32`);
}
const recursive = (names, ...subdirectories) =>
Promise.all(names.map(async name => {
const devicePath = pathJoinDevice(rootPath, ...subdirectories, name);
const stats = await stat(devicePath);
if (stats.isDirectory() && !filterDir(name)) return [];
else if (stats.isFile() && !filterFile(name)) return [];
else if (!stats.isDirectory() && !stats.isFile()) return [];
if (stats.isDirectory()) {
return recursive(await readdir(devicePath), ...subdirectories, name);
} else {
return pathJoinStyle(prefixPath, ...subdirectories, name);
}
}));
const names = await readdir(rootPath);
const results = await recursive(names);
return results.flat(Infinity);
}
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