padDiff.js: convert to Promises/async
Ray Bellis
parent
4622309dc2
commit
ccb49dcdc1
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@ -1,7 +1,5 @@
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var Changeset = require("../../static/js/Changeset");
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var async = require("async");
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var exportHtml = require('./ExportHtml');
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const thenify = require("thenify").withCallback;
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function PadDiff (pad, fromRev, toRev) {
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// check parameters
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@ -79,79 +77,52 @@ PadDiff.prototype._isClearAuthorship = function(changeset) {
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return true;
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};
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PadDiff.prototype._createClearAuthorship = thenify(function(rev, callback) {
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var self = this;
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this._pad.getInternalRevisionAText(rev, function(err, atext) {
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if (err) {
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return callback(err);
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}
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PadDiff.prototype._createClearAuthorship = async function(rev) {
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// build clearAuthorship changeset
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var builder = Changeset.builder(atext.text.length);
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builder.keepText(atext.text, [['author','']], self._pad.pool);
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var changeset = builder.toString();
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let atext = await this._pad.getInternalRevisionAText(rev);
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callback(null, changeset);
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});
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});
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// build clearAuthorship changeset
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var builder = Changeset.builder(atext.text.length);
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builder.keepText(atext.text, [['author','']], this._pad.pool);
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var changeset = builder.toString();
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PadDiff.prototype._createClearStartAtext = thenify(function(rev, callback) {
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var self = this;
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return changeset;
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}
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PadDiff.prototype._createClearStartAtext = async function(rev) {
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// get the atext of this revision
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this._pad.getInternalRevisionAText(rev, function(err, atext) {
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if (err) {
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return callback(err);
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}
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let atext = this._pad.getInternalRevisionAText(rev);
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// create the clearAuthorship changeset
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self._createClearAuthorship(rev, function(err, changeset) {
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if (err) {
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return callback(err);
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}
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// create the clearAuthorship changeset
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let changeset = await this._createClearAuthorship(rev);
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try {
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// apply the clearAuthorship changeset
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var newAText = Changeset.applyToAText(changeset, atext, self._pad.pool);
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} catch(err) {
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return callback(err)
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}
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// apply the clearAuthorship changeset
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let newAText = Changeset.applyToAText(changeset, atext, this._pad.pool);
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callback(null, newAText);
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});
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});
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});
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return newAText;
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}
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PadDiff.prototype._getChangesetsInBulk = thenify(function(startRev, count, callback) {
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var self = this;
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PadDiff.prototype._getChangesetsInBulk = async function(startRev, count) {
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// find out which revisions we need
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var revisions = [];
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for (var i = startRev; i < (startRev + count) && i <= this._pad.head; i++) {
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let revisions = [];
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for (let i = startRev; i < (startRev + count) && i <= this._pad.head; i++) {
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revisions.push(i);
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}
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var changesets = [], authors = [];
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// get all needed revisions
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async.forEach(revisions, function(rev, callback) {
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self._pad.getRevision(rev, function(err, revision) {
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if (err) {
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return callback(err);
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}
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var arrayNum = rev-startRev;
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// get all needed revisions (in parallel)
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let changesets = [], authors = [];
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await Promise.all(revisions.map(rev => {
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return this._pad.getRevision(rev).then(revision => {
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let arrayNum = rev - startRev;
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changesets[arrayNum] = revision.changeset;
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authors[arrayNum] = revision.meta.author;
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callback();
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});
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},
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function(err) {
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callback(err, changesets, authors);
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});
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});
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}));
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return { changesets, authors };
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}
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PadDiff.prototype._addAuthors = function(authors) {
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var self = this;
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@ -164,144 +135,91 @@ PadDiff.prototype._addAuthors = function(authors) {
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});
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};
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PadDiff.prototype._createDiffAtext = thenify(function(callback) {
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var self = this;
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var bulkSize = 100;
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PadDiff.prototype._createDiffAtext = async function() {
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let bulkSize = 100;
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// get the cleaned startAText
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self._createClearStartAtext(self._fromRev, function(err, atext) {
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if (err) { return callback(err); }
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let atext = await this._createClearStartAtext(this._fromRev);
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var superChangeset = null;
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let superChangeset = null;
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let rev = this._fromRev + 1;
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var rev = self._fromRev + 1;
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for (let rev = this._fromRev + 1; rev <= this._toRev; rev += bulkSize) {
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// async while loop
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async.whilst(
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// loop condition
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function () { return rev <= self._toRev; },
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// get the bulk
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let { changesets, authors } = await this._getChangesetsInBulk(rev, bulkSize);
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// loop body
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function (callback) {
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// get the bulk
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self._getChangesetsInBulk(rev,bulkSize,function(err, changesets, authors) {
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var addedAuthors = [];
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let addedAuthors = [];
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// run trough all changesets
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for (var i = 0; i < changesets.length && (rev + i) <= self._toRev; i++) {
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var changeset = changesets[i];
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// run through all changesets
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for (let i = 0; i < changesets.length && (rev + i) <= this._toRev; ++i) {
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let changeset = changesets[i];
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// skip clearAuthorship Changesets
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if (self._isClearAuthorship(changeset)) {
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continue;
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}
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changeset = self._extendChangesetWithAuthor(changeset, authors[i], self._pad.pool);
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// add this author to the authorarray
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addedAuthors.push(authors[i]);
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// compose it with the superChangset
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if (superChangeset === null) {
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superChangeset = changeset;
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} else {
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superChangeset = Changeset.composeWithDeletions(superChangeset, changeset, self._pad.pool);
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}
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}
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// add the authors to the PadDiff authorArray
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self._addAuthors(addedAuthors);
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// lets continue with the next bulk
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rev += bulkSize;
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callback();
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});
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},
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// after the loop has ended
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function (err) {
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// if there are only clearAuthorship changesets, we don't get a superChangeset, so we can skip this step
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if (superChangeset) {
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var deletionChangeset = self._createDeletionChangeset(superChangeset,atext,self._pad.pool);
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try {
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// apply the superChangeset, which includes all addings
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atext = Changeset.applyToAText(superChangeset, atext, self._pad.pool);
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// apply the deletionChangeset, which adds a deletions
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atext = Changeset.applyToAText(deletionChangeset, atext, self._pad.pool);
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} catch(err) {
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return callback(err)
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}
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}
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callback(err, atext);
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// skip clearAuthorship Changesets
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if (this._isClearAuthorship(changeset)) {
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continue;
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}
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);
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});
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});
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PadDiff.prototype.getHtml = thenify(function(callback) {
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changeset = this._extendChangesetWithAuthor(changeset, authors[i], this._pad.pool);
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// add this author to the authorarray
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addedAuthors.push(authors[i]);
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// compose it with the superChangset
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if (superChangeset === null) {
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superChangeset = changeset;
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} else {
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superChangeset = Changeset.composeWithDeletions(superChangeset, changeset, this._pad.pool);
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}
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}
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// add the authors to the PadDiff authorArray
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this._addAuthors(addedAuthors);
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}
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// if there are only clearAuthorship changesets, we don't get a superChangeset, so we can skip this step
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if (superChangeset) {
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let deletionChangeset = this._createDeletionChangeset(superChangeset, atext, this._pad.pool);
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// apply the superChangeset, which includes all addings
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atext = Changeset.applyToAText(superChangeset, atext, this._pad.pool);
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// apply the deletionChangeset, which adds a deletions
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atext = Changeset.applyToAText(deletionChangeset, atext, this._pad.pool);
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}
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return atext;
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}
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PadDiff.prototype.getHtml = async function() {
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// cache the html
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if (this._html != null) {
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return callback(null, this._html);
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return this._html;
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}
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var self = this;
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var atext, html, authorColors;
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// get the diff atext
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let atext = await this._createDiffAtext();
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async.series([
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// get the diff atext
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function(callback) {
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self._createDiffAtext(function(err, _atext) {
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if (err) {
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return callback(err);
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}
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// get the authorColor table
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let authorColors = await this._pad.getAllAuthorColors();
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atext = _atext;
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callback();
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});
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},
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// convert the atext to html
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this._html = exportHtml.getHTMLFromAtext(this._pad, atext, authorColors);
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// get the authorColor table
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function(callback) {
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self._pad.getAllAuthorColors(function(err, _authorColors) {
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if (err) {
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return callback(err);
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}
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return this._html;
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}
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authorColors = _authorColors;
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callback();
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});
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},
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// convert the atext to html
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function(callback) {
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html = exportHtml.getHTMLFromAtext(self._pad, atext, authorColors);
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self._html = html;
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callback();
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}
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],
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function(err) {
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callback(err, html);
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});
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});
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PadDiff.prototype.getAuthors = thenify(function(callback) {
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var self = this;
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PadDiff.prototype.getAuthors = async function() {
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// check if html was already produced, if not produce it, this generates the author array at the same time
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if (self._html == null) {
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self.getHtml(function(err) {
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if (err) {
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return callback(err);
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}
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callback(null, self._authors);
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});
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} else {
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callback(null, self._authors);
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if (this._html == null) {
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await this.getHtml();
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}
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});
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return self._authors;
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}
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PadDiff.prototype._extendChangesetWithAuthor = function(changeset, author, apool) {
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// unpack
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