link-unlink/dist/cjs/link.js

Link and unlink with saving and restoring the previous file or directory

"use strict";
Object.defineProperty(exports, "__esModule", {
    value: true
});
Object.defineProperty(exports, "default", {
    enumerable: true,
    get: function() {
        return link;
    }
});
var _fs = /*#__PURE__*/ _interop_require_default(require("fs"));
var _lock = require("lock");
var _mkdirpclassic = /*#__PURE__*/ _interop_require_default(require("mkdirp-classic"));
var _path = /*#__PURE__*/ _interop_require_default(require("path"));
var _tempsuffix = /*#__PURE__*/ _interop_require_default(require("temp-suffix"));
function _interop_require_default(obj) {
    return obj && obj.__esModule ? obj : {
        default: obj
    };
}
var lock = (0, _lock.Lock)();
var isWindows = process.platform === 'win32' || /^(msys|cygwin)$/.test(process.env.OSTYPE);
var dirSymlinkType = isWindows ? 'junction' : 'dir';
function saveLink(target, callback) {
    var movedPath = _path.default.join(_path.default.dirname(target), "".concat(_path.default.basename(target), ".").concat((0, _tempsuffix.default)()));
    _fs.default.rename(target, movedPath, callback);
}
function createLink(src, target, callback) {
    _fs.default.stat(src, function(err, stat) {
        if (err) return callback(err);
        (0, _mkdirpclassic.default)(_path.default.dirname(target), function() {
            _fs.default.symlink(src, target, stat.isFile() ? 'file' : dirSymlinkType, function(err) {
                if (!err) return callback(null, target);
                // already exists, move and try to link again
                return saveLink(target, function(err) {
                    err ? callback(err) : createLink(src, target, callback);
                });
            });
        });
    });
}
function worker(src, target, callback) {
    lock([
        src,
        target
    ], function(release) {
        callback = release(callback);
        _fs.default.stat(target, function(_, stat) {
            // doesn't exist, create
            if (!stat) return createLink(src, target, callback);
            // exists so move it
            return saveLink(target, function(err) {
                err ? callback(err) : createLink(src, target, callback);
            });
        });
    });
}
function link(src, target, callback) {
    if (typeof callback === 'function') return worker(src, target, callback);
    return new Promise(function(resolve, reject) {
        return worker(src, target, function(err, restore) {
            return err ? reject(err) : resolve(restore);
        });
    });
}
/* CJS INTEROP */ if (exports.__esModule && exports.default) { try { Object.defineProperty(exports.default, '__esModule', { value: true }); for (var key in exports) { exports.default[key] = exports[key]; } } catch (_) {}; module.exports = exports.default; }