93 lines
2.8 KiB
JavaScript
93 lines
2.8 KiB
JavaScript
/* jslint node: true */
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'use strict';
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// ENiGMA½
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const EnigAssert = require('./enigma_assert.js');
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// deps
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const fse = require('fs-extra');
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const paths = require('path');
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const async = require('async');
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exports.moveFileWithCollisionHandling = moveFileWithCollisionHandling;
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exports.copyFileWithCollisionHandling = copyFileWithCollisionHandling;
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exports.pathWithTerminatingSeparator = pathWithTerminatingSeparator;
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function moveOrCopyFileWithCollisionHandling(src, dst, operation, cb) {
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operation = operation || 'copy';
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const dstPath = paths.dirname(dst);
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const dstFileExt = paths.extname(dst);
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const dstFileSuffix = paths.basename(dst, dstFileExt);
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EnigAssert('move' === operation || 'copy' === operation);
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let renameIndex = 0;
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let opOk = false;
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let tryDstPath;
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function tryOperation(src, dst, callback) {
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if ('move' === operation) {
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fse.move(src, tryDstPath, err => {
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return callback(err);
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});
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} else if ('copy' === operation) {
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fse.copy(src, tryDstPath, { overwrite: false, errorOnExist: true }, err => {
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return callback(err);
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});
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}
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}
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async.until(
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callback => callback(null, opOk), // until moved OK
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cb => {
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if (0 === renameIndex) {
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// try originally supplied path first
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tryDstPath = dst;
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} else {
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tryDstPath = paths.join(
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dstPath,
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`${dstFileSuffix}(${renameIndex})${dstFileExt}`
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);
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}
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tryOperation(src, tryDstPath, err => {
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if (err) {
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// for some reason fs-extra copy doesn't pass err.code
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// :TODO: this is dangerous: submit a PR to fs-extra to set EEXIST
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if ('EEXIST' === err.code || 'dest already exists.' === err.message) {
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renameIndex += 1;
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return cb(null); // keep trying
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}
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return cb(err);
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}
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opOk = true;
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return cb(null, tryDstPath);
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});
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},
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(err, finalPath) => {
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return cb(err, finalPath);
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}
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);
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}
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//
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// Move |src| -> |dst| renaming to file(1).ext, file(2).ext, etc.
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// in the case of collisions.
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//
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function moveFileWithCollisionHandling(src, dst, cb) {
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return moveOrCopyFileWithCollisionHandling(src, dst, 'move', cb);
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}
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function copyFileWithCollisionHandling(src, dst, cb) {
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return moveOrCopyFileWithCollisionHandling(src, dst, 'copy', cb);
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}
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function pathWithTerminatingSeparator(path) {
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if (path && paths.sep !== path.charAt(path.length - 1)) {
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path = path + paths.sep;
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}
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return path;
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}
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