show commit messages on Gist

gist-logs.user.js

// ==UserScript==
// @name           gist logs
// @namsgpace      https://www.hatena.ne.jp/noromanba/
// @description    show commit messages on Gist
// @include        https://gist.github.com/*
// @version        0.0.3
// @update         2012-07-18T21:18:13.437Z(GMT+09:00)
// @license        WTFPL http://sam.zoy.org/wtfpl/ (Do What The Fuck You Want To Public License)
// @contributor    satyr           https://gist.github.com/107780
// @contributor    saitamanodoruji https://gist.github.com/2653937
// @author         noromanba (https://www.hatena.ne.jp/noromanba/)
// @homepage       https://gist.github.com/2669793
// @icon           https://upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Talk_icon.svg/32px-Talk_icon.svg.png
// @icon64         https://upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Talk_icon.svg/64px-Talk_icon.svg.png
// @run-at         document-end
// @priority       0
// @compatibility  Firefox 14.0.1(Scriptish 0.1.7), Chrome 20.0.1132.57, Safari 5.1.7(NinjaKit 0.9.1) on Windows 7 Home Premium SP1 64bit
// @charset        UTF-8
// ==/UserScript==

// Icon (Public Domain by Jonathan)
// https://commons.wikimedia.org/wiki/File:Talk_icon.svg

// c.f. http://d.hatena.ne.jp/murky-satyr/20090508/gist_logs

/*jslint browser: true, maxlen: 80*/
/*global GM_xmlhttpRequest*/
// Edition 2012-07-13

(function executeShowCommitMessages(doc) {
    'use strict';

    var GIST_META_URL, GITHUB_LOADING_ICON, revisions, gmXHR, button,
        revisionHeadline, revisionList, ids, idsLen, messages, noMessageIdExp,
        $X, addMessage, req, removeButtonAndEventListener, addAllMessage,
        cancelDblclickSelect, selectRevisions, details, noMessageIds, idx, id,
        loading;

    revisions = doc.getElementById('revisions');

    if (!revisions) {
        return;
    }

    doc.head.appendChild(doc.createElement('style')).textContent = [
        '#revisions > h3 > .classy {',
        '  top: -2px !important;',
        '  height: auto !important;',
        '}',
        '#revisions > h3 > .classy > span {',
        '  height: auto !important;',
        '  line-height: normal !important;',
        '}',
        '.loading {',
        '  margin-left: 10px !important;',
        '  margin-bottom: -3px !important;',
        '  height: 19px !important;',
        '}',
        '.message {',
        '  border: 1px solid silver !important;',
        '  border-radius: 10px !important;',
        '  padding: 0 3px !important;',
        '  word-break: break-all !important;',
        '  white-space: pre-wrap !important;',
        '}',
        '.error {',
        '  color: red !important;',
        '}'
    ].join('\n');

    GIST_META_URL = 'https://raw.github.com/gist';
    GITHUB_LOADING_ICON =
        'https://assets.github.com/images/spinners/octocat-spinner-32.gif';

    gmXHR = GM_xmlhttpRequest;
    button = doc.createElement('button');
    revisionHeadline = revisions.firstElementChild;
    revisionList = revisionHeadline.nextElementSibling;
    ids = revisionList.getElementsByClassName('id');
    idsLen = ids.length;
    messages = revisionList.getElementsByClassName('message');
    noMessageIdExp =  'a[' + (
        'contains(concat(" ", @class, " "), " id ") and ' +
            'not(' + (
                'following-sibling::pre[' + (
                    'contains(concat(" ", @class, " "), " message ")'
                ) + ']'
            ) + ')'
    ) + ']';

    $X = function $X(exp, context) {
        var root, result, len, idx, nodes;

        root = context ? context.ownerDocument : (context = doc);
        result = root.evaluate(exp, context, null, 7, null);
        len = result.snapshotLength;

        for (idx = 0, nodes = []; idx < len; idx += 1) {
            nodes.push(result.snapshotItem(idx));
        }

        return nodes;
    };
    addMessage = function addMessage(res) {
        var message, matchMessage;

        message = doc.createElement('pre');

        message.className = 'message';

        if (/^(?:200|304)$/.test(res.status)) {
            matchMessage = /\n{2}([\s\S]+)\n$/m.exec(res.responseText);

            if (matchMessage) {
                message.textContent = matchMessage[1];
            } else {
                message.classList.add('error');
                message.textContent = 'commit message not found';
            }
        } else {
            message.classList.add('error');
            message.textContent = 'loading error';
        }

        id.parentNode.appendChild(message);

        if (messages.length < idsLen) {
            if (noMessageIds) {
                req(noMessageIds[idx += 1]);
            } else {
                loading.hidden = true;
            }
        } else {
            revisionHeadline.removeChild(loading);
        }
    };
    req = function req(rev) {
        if (!rev) {
            return;
        }

        id = rev;

        if (loading) {
            loading.hidden = false;
        } else {
            loading = doc.createElement('img');
            loading.className = 'loading';
            loading.src = GITHUB_LOADING_ICON;
            revisionHeadline.appendChild(loading);
        }

        details.url = GIST_META_URL + id.pathname;

        gmXHR(details);
    };
    removeButtonAndEventListener = function removeButtonAndEventListener() {
        button.removeEventListener('click', addAllMessage);
        button.parentNode.removeChild(button);
        revisionList.removeEventListener('selectstart', cancelDblclickSelect);
        revisionList.removeEventListener('dblclick', selectRevisions);
    };
    addAllMessage = function addAllMessage() {
        removeButtonAndEventListener();

        noMessageIds = $X('.//' + noMessageIdExp, revisions);
        idx = 0;

        req(noMessageIds[idx]);
    };
    cancelDblclickSelect = function cancelDblclickSelect(evt) {
        var target;

        target = evt.target;

        if (!(target.tagName === 'LI' && target.parentNode === revisionList)) {
            return;
        }

        evt.preventDefault();
    };
    selectRevisions = function selectRevisions(evt) {
        var target;

        target = evt.target;

        if (target.tagName === 'A') {
            return;
        }

        if (messages.length === (idsLen - 1)) {
            removeButtonAndEventListener();
        }

        req($X('./ancestor-or-self::li[@class]/' + noMessageIdExp, target)[0]);
    };

    details = {method: 'GET', onload: addMessage, onerror: addMessage};

    button.className = 'classy';
    button.insertAdjacentHTML('BeforeEnd', '<span>message</span>');
    revisionHeadline.appendChild(button);

    button.addEventListener('click', addAllMessage);
    revisionList.addEventListener('selectstart', cancelDblclickSelect);
    revisionList.addEventListener('dblclick', selectRevisions);
}(document));

@noromanba
Thank you! I also fixed the bug.