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From: vladimir-kotikov <git@git.apache.org>
To: dev@cordova.apache.org
Reply-To: dev@cordova.apache.org
References: <git-pr-429-cordova-lib@git.apache.org>
In-Reply-To: <git-pr-429-cordova-lib@git.apache.org>
Subject: [GitHub] cordova-lib pull request: CB-11117: Add FileUpdater module
 to cord...
Content-Type: text/plain
Message-Id: <20160420123712.E128CDFD7B@git1-us-west.apache.org>
Date: Wed, 20 Apr 2016 12:37:12 +0000 (UTC)

Github user vladimir-kotikov commented on a diff in the pull request:

    https://github.com/apache/cordova-lib/pull/429#discussion_r60398700
  
    --- Diff: cordova-common/src/FileUpdater.js ---
    @@ -0,0 +1,389 @@
    +/**
    +    Licensed to the Apache Software Foundation (ASF) under one
    +    or more contributor license agreements.  See the NOTICE file
    +    distributed with this work for additional information
    +    regarding copyright ownership.  The ASF licenses this file
    +    to you under the Apache License, Version 2.0 (the
    +    "License"); you may not use this file except in compliance
    +    with the License.  You may obtain a copy of the License at
    +
    +    http://www.apache.org/licenses/LICENSE-2.0
    +
    +    Unless required by applicable law or agreed to in writing,
    +    software distributed under the License is distributed on an
    +    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    +    KIND, either express or implied.  See the License for the
    +    specific language governing permissions and limitations
    +    under the License.
    +*/
    +
    +"use strict";
    +
    +var fs = require("fs");
    +var path = require("path");
    +var shell = require("shelljs");
    +var minimatch = require("minimatch");
    +
    +/**
    + * Updates a target file or directory with a source file or directory. (Directory updates are
    + * not recursive.) Stats for target and source items must be passed in. This is an internal
    + * helper function used by other methods in this module.
    + *
    + * @param {string|null} rootDir Root directory (such as a project) to which target and source
    + *     path parameters are relative, or null if the paths are absolute. The rootDir is omitted
    + *     from any logged paths, to make the logs easier to read.
    + * @param {string} targetPath Destination file or directory to be updated. If it does not exist,
    + *     it will be created.
    + * @param {fs.Stats|null} targetStats An instance of fs.Stats for the target path, or null if
    + *     the target does not exist.
    + * @param {string|null} sourcePath Source file or directory to be used to update the
    + *     destination. If the source is null, then the destination is deleted if it exists.
    + * @param {fs.Stats|null} sourceStats An instance of fs.Stats for the source path, or null if
    + *     the source does not exist.
    + * @param {boolean} force If target and source are both files, and the force flag is not
    + *     set, then the file will not be copied unless the source is newer than the target.
    + * @param {function} [log] Optional logging callback that takes a string message describing any
    + *     file operations that are performed.
    + * @return {boolean} true if any changes were made, or false if the force flag is not set
    + *     and everything was up to date
    + */
    +function updatePathWithStats(
    +        rootDir, targetPath, targetStats, sourcePath, sourceStats, force, log) {
    +    log = log || function(message) { };
    +    var updated = false;
    +
    +    var targetFullPath = path.join(rootDir || "", targetPath);
    +
    +    if (sourceStats) {
    +        var sourceFullPath = path.join(rootDir || "", sourcePath);
    +
    +        if (targetStats) {
    +            // The target exists. But if the directory status doesn't match the source, delete it.
    +            if (targetStats.isDirectory() && !sourceStats.isDirectory()) {
    +                log("rmdir " + targetPath + " (source is a file)");
    +                shell.rm("-rf", targetFullPath);
    +                targetStats = null;
    +                updated = true;
    +            } else if (!targetStats.isDirectory() && sourceStats.isDirectory()) {
    +                log("delete " + targetPath + " (source is a directory)");
    +                shell.rm("-f", targetFullPath);
    +                targetStats = null;
    +                updated = true;
    +            }
    +        }
    +
    +        if (!targetStats) {
    +            if (sourceStats.isDirectory()) {
    +                // The target directory does not exist, so it should be created.
    +                log("mkdir " + targetPath);
    +                shell.mkdir("-p", targetFullPath);
    +                updated = true;
    +            } else if (sourceStats.isFile()) {
    +                // The target file does not exist, so it should be copied from the source.
    +                log("copy " + sourcePath + " " + targetPath +
    +                    (!force ? " (new file)" : ""));
    +                shell.cp("-f", sourceFullPath, targetFullPath);
    +                updated = true;
    +            }
    +        } else if (sourceStats.isFile() && targetStats.isFile() &&
    +                (force || sourceStats.mtime > targetStats.mtime)) {
    +            // When the source and target paths both exist and are files, update
    +            // the file if the source is newer or if doing a forced update.
    +            log("copy " + sourcePath + " " + targetPath +
    +                (!force ? " (updated file)" : ""));
    +            shell.cp("-f", sourceFullPath, targetFullPath);
    +            updated = true;
    +        }
    +    } else if (targetStats) {
    +        // The target exists but the source is null, so the target should be deleted.
    +        if (targetStats.isDirectory()) {
    +            log("rmdir " + targetPath + " (no source)");
    +            shell.rm("-rf", targetFullPath);
    +        } else {
    +            log("delete " + targetPath + " (no source)");
    +            shell.rm("-f", targetFullPath);
    +        }
    +        updated = true;
    +    }
    +
    +    return updated;
    +}
    +
    +/**
    + * Updates a target file or directory with a source file or directory. (Directory updates are
    + * not recursive.)
    + *
    + * @param {string|null} rootDir Root directory (such as a project) to which target and source
    + *     path parameters are relative, or null if the paths are absolute. The rootDir is omitted
    + *     from any logged paths, to make the logs easier to read.
    + * @param {string} targetPath Destination file or directory to be updated. If it does not exist,
    + *     it will be created.
    + * @param {string|null} sourcePath Source file or directory to be used to update the
    + *     destination. If the source is null, then the destination is deleted if it exists.
    + * @param {boolean} force If target and source are both files, and the force flag is not
    + *     set, then the file will not be copied unless the source is newer than the target.
    + * @param {function} [log] Optional logging callback that takes a string message describing any
    + *     file operations that are performed.
    + * @return {boolean} true if any changes were made, or false if the force flag is not set
    + *     and everything was up to date
    + */
    +function updatePath(rootDir, targetPath, sourcePath, force, log) {
    +    rootDir = rootDir || "";
    +    if (typeof(rootDir) !== "string") {
    +        throw new Error("A root directory path is required.");
    +    }
    +
    +    if (!targetPath || typeof(targetPath) !== "string") {
    +        throw new Error("A target path is required.");
    +    }
    +
    +    if (sourcePath && typeof(sourcePath) !== "string") {
    +        throw new Error("A source path (or null) is required.");
    +    }
    +
    +    log = log || function(message) { };
    +
    +    var targetFullPath = path.join(rootDir, targetPath);
    +    var targetStats = fs.existsSync(targetFullPath) ? fs.statSync(targetFullPath) : null;
    +    var sourceStats = null;
    +
    +    if (sourcePath) {
    +        // A non-null source path was specified. It should exist.
    +        var sourceFullPath = path.join(rootDir, sourcePath);
    +        if (!fs.existsSync(sourceFullPath)) {
    +            throw new Error("Source path does not exist: " + sourcePath);
    +        }
    +
    +        sourceStats = fs.statSync(sourceFullPath);
    +
    +        // Create the target's parent directory if it doesn't exist.
    +        var parentDir = path.dirname(targetFullPath);
    +        if (!fs.existsSync(parentDir)) {
    +            shell.mkdir("-p", parentDir);
    +        }
    +    }
    +
    +    return updatePathWithStats(
    +        rootDir, targetPath, targetStats, sourcePath, sourceStats, force, log);
    +}
    +
    +/**
    + * Updates files and directories based on a mapping from target paths to source paths. Targets
    + * with null sources in the map are deleted.
    + *
    + * @param {string|null} rootDir Root directory (such as a project) to which target and source
    + *     path parameters are relative, or null if the paths are absolute. The rootDir is omitted
    + *     from any logged paths, to make the logs easier to read.
    + * @param {object} pathMap A dictionary mapping from target paths to source paths.
    + * @param {boolean} force If target and source are both files, and the force flag is not
    + *     set, then the file will not be copied unless the source is newer than the target.
    + * @param {function} [log] Optional logging callback that takes a string message describing any
    + *     file operations that are performed.
    + * @return {boolean} true if any changes were made, or false if the force flag is not set
    + *     and everything was up to date
    + */
    +function updatePaths(rootDir, pathMap, force, log) {
    +    if (!pathMap || typeof(pathMap) !== "object") {
    --- End diff --
    
    it would not throw if pathMap is an array (`typeof [] === 'object'` is truthy)


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