Gerrit Changed Files Mover

gerrit_move.js

// ==UserScript==
// @name         Gerrit Change Mover
// @version      0.3
// @description  Add keybindings to move through only modified files
// @author       Robert Nelson
// @match        http://gerrit/
// @updateUrl    https://gist.githubusercontent.com/rdnelson/8e596fd89232cebc0445/raw/gerrit_move.js
// @downloadUrl  https://gist.githubusercontent.com/rdnelson/8e596fd89232cebc0445/raw/gerrit_move.js
// @grant        none
// ==/UserScript==
/* jshint -W097 */
'use strict';

var changeid;
var startRev;
var endRev;
var curFile;

var startHash = "";
var endHash = "";

var fileIdx = -1;
var changedFiles = [];
var disableInstall = false;

var changeObserver;

function findAncestor (el, cls) {
    while ((el = el.parentElement) && !el.classList.contains(cls));
    return el;
}

function ajax(url, callback) {
    var request = new XMLHttpRequest();
    request.open('GET', url, true);

    request.onload = function() {
        if (request.status >= 200 && request.status < 400) {
            // Success!
            var data = JSON.parse(request.responseText.substring(4));
            if (callback) {
                callback(data);
            }
        } else {
            // We reached our target server, but it returned an error
        }
    };

    request.onerror = function() {
        // There was a connection error of some sort
    };

    request.send();
}

function moveFile(e) {
    var active = document.activeElement;
    var ignore = findAncestor(active, "CodeMirror-linewidget") !== null || findAncestor(active, "CodeMirror-dialog") !== null;

    if (ignore) {
        return;
    }

    if (e.keyCode == 102 || e.keyCode == 54) { // NUM 6
        moveNext();
    } else if (e.keyCode == 100 || e.keyCode == 52) { // NUM 4
        movePrev();
    }
}

function moveNext() {
    if (changedFiles.length === 0) {
        return;
    }

    fileIdx++;
    loadFile();
}

function movePrev() {
    if (changedFiles.length === 0) {
        return;
    }

    fileIdx--;
    loadFile();
}

function contentLoaded(){
    var fileElements = document.getElementsByClassName("GKSE20JDHAB");
    if (fileElements.length == 1) {
        fileElements[0].innerHTML += " (" + fileIdx + "/" + changedFiles.length + ")";
    }
}

function loadFile() {
    var prefix = "/#/c/" + changeid + "/" + startRev + ".." + endRev;
    if (fileIdx >= changedFiles.length) {
        fileIdx = -1;
    }

    if (fileIdx == -1) {
        disableInstall = true;
        document.location.href = prefix;
        return;
    } else if (fileIdx < -1) {
        fileIdx = changedFiles.length - 1;
    }

    disableInstall = true;

    document.location.href = prefix + "/" + changedFiles[fileIdx] + ",cm";

    var target = document.querySelector('.GKSE20JDB5');

    // create an observer instance
    changeObserver = new MutationObserver(function() {
        contentLoaded();
    });

    // configuration of the observer:
    var config = { childList: true };

    // pass in the target node, as well as the observer options
    changeObserver.observe(target, config);
}

function load(matches) {
    if (matches !== null) {

        changeid = matches[1];
        startRev = matches[2];
        endRev = matches[3];
        curFile = matches[4];

        if (curFile.endsWith(",cm")) {
            curFile = curFile.substring(0, curFile.length - 3);
        }

        changedFiles = [];

        ajax("/changes/" + changeid + "/detail?O=404", function(data) {
            for(var rev in data.revisions) {
                if (data.revisions[rev]._number == endRev) {
                    endHash = rev;
                } else if (data.revisions[rev]._number == startRev) {
                    startHash = rev;
                }

                if (startHash !== "" && endHash !== "") {
                    break;
                }
            }

            ajax("/changes/" + changeid + "/revisions/" + endHash + "/files?base=" + startHash, function(files) {
                for(var file in files) {
                    changedFiles.push(file);

                    if (file == curFile) {
                        fileIdx = changedFiles.length - 1;
                    }
                }

                document.addEventListener("keydown", moveFile, false);
            });
        });
    }
}

function install() {
    if (disableInstall) {
        disableInstall = false;
        return;
    }

    console.log("Checking for Gerrit Range...");
    var url = window.location.href;
    var matches = /\/#\/c\/(\d+)\/(\d+)\.\.(\d+)\/?(.*)/.exec(url);

    if (matches !== null) {
        console.log("Found one!");
        load(matches);
    } else {
        console.log("Didn't find one...");
    }
}

window.addEventListener("hashchange", install);

install();