Extract publish task logic from grunt-gh-pages

+ lint fix for git.js

lib/util.js

@@ -0,0 +1,164 @@
+var path = require('path');
+
+var async = require('async');
+var fs = require('graceful-fs');
+var Q = require('q');
+
+
+/**
+ * Generate a list of unique directory paths given a list of file paths.
+ * @param {Array.<string>} files List of file paths.
+ * @return {Array.<string>} List of directory paths.
+ */
+var uniqueDirs = exports.uniqueDirs = function(files) {
+  var dirs = {};
+  files.forEach(function(filepath) {
+    var parts = path.dirname(filepath).split(path.sep);
+    var partial = parts[0];
+    dirs[partial] = true;
+    for (var i = 1, ii = parts.length; i < ii; ++i) {
+      partial = path.join(partial, parts[i]);
+      dirs[partial] = true;
+    }
+  });
+  return Object.keys(dirs);
+};
+
+
+/**
+ * Sort function for paths.  Sorter paths come first.  Paths of equal length are
+ * sorted alphanumerically in path segment order.
+ * @param {string} a First path.
+ * @param {string} b Second path.
+ * @return {number} Comparison.
+ */
+var byShortPath = exports.byShortPath = function(a, b) {
+  var aParts = a.split(path.sep);
+  var bParts = b.split(path.sep);
+  var aLength = aParts.length;
+  var bLength = bParts.length;
+  var cmp = 0;
+  if (aLength < bLength) {
+    cmp = -1;
+  } else if (aLength > bLength) {
+    cmp = 1;
+  } else {
+    var aPart, bPart;
+    for (var i = 0; i < aLength; ++i) {
+      aPart = aParts[i];
+      bPart = bParts[i];
+      if (aPart < bPart) {
+        cmp = -1;
+        break;
+      } else if (aPart > bPart) {
+        cmp = 1;
+        break;
+      }
+    }
+  }
+  return cmp;
+};
+
+
+/**
+ * Generate a list of directories to create given a list of file paths.
+ * @param {Array.<string>} files List of file paths.
+ * @return {Array.<string>} List of directory paths ordered by path length.
+ */
+var dirsToCreate = exports.dirsToCreate = function(files) {
+  return uniqueDirs(files).sort(byShortPath);
+};
+
+
+/**
+ * Copy a file.
+ * @param {Object} obj Object with src and dest properties.
+ * @param {function(Error)} callback Callback
+ */
+var copyFile = exports.copyFile = function(obj, callback) {
+  var called = false;
+  function done(err) {
+    if (!called) {
+      called = true;
+      callback(err);
+    }
+  }
+
+  var read = fs.createReadStream(obj.src);
+  read.on('error', function(err) {
+    done(err);
+  });
+
+  var write = fs.createWriteStream(obj.dest);
+  write.on('error', function(err) {
+    done(err);
+  });
+  write.on('close', function(ex) {
+    done();
+  });
+
+  read.pipe(write);
+};
+
+
+/**
+ * Make directory, ignoring errors if directory already exists.
+ * @param {string} path Directory path.
+ * @param {function(Error)} callback Callback.
+ */
+function makeDir(path, callback) {
+  fs.mkdir(path, function(err) {
+    if (err) {
+      // check if directory exists
+      fs.stat(path, function(err2, stat) {
+        if (err2 || !stat.isDirectory()) {
+          callback(err);
+        } else {
+          callback();
+        }
+      });
+    } else {
+      callback();
+    }
+  });
+}
+
+
+/**
+ * Copy a list of files.
+ * @param {Array.<string>} files Files to copy.
+ * @param {string} base Base directory.
+ * @param {string} dest Destination directory.
+ * @return {Promise} A promise.
+ */
+var copy = exports.copy = function(files, base, dest) {
+  var deferred = Q.defer();
+
+  var pairs = [];
+  var destFiles = [];
+  files.forEach(function(file) {
+    var src = path.resolve(base, file);
+    var relative = path.relative(base, src);
+    var target = path.join(dest, relative);
+    pairs.push({
+      src: src,
+      dest: target
+    });
+    destFiles.push(target);
+  });
+
+  async.eachSeries(dirsToCreate(destFiles), makeDir, function(err) {
+    if (err) {
+      return deferred.reject(err);
+    }
+    async.each(pairs, copyFile, function(err) {
+      if (err) {
+        return deferred.reject(err);
+      } else {
+        return deferred.resolve();
+      }
+    });
+  });
+
+  return deferred.promise;
+};