MediaWiki:Gadget-TimeBug.js

(function() {
    var action = mw.config.get('wgAction');
    var title  = mw.config.get('wgPageName', '');

    if(action === 'edit') {
        if(window.localStorage && window.localStorage.getItem && window.localStorage.setItem && window.localStorage.removeItem) {
            // =================================================
            // Utility Functions
            // =================================================
            function getCache() {
                var cache = localStorage.getItem('elwiki.timebug.cache') || '';
                var map   = {};

                try {
                    map = JSON.parse(cache);
                } catch (err) {
                    map = {};
                }

                return map;
            }

            function getCacheEntry() {
                var cache = getCache();

                return cache[title];
            }

            function setCache() {
                var cache = getCache();

                cache[title] = getWikiText();

                localStorage.setItem('elwiki.timebug.cache', JSON.stringify(cache));
            }

            function deleteCache() {
                var cache = getCache();

                delete cache[title];

                localStorage.setItem('elwiki.timebug.cache', JSON.stringify(cache));
            }

            function getWikiText() {
                return document.getElementById('wpTextbox1').value;
            }

            function setWikiText(value) {
                document.getElementById('wpTextbox1').value = value;
            }

            function getSkip() {
                var skip = localStorage.getItem('elwiki.timebug.skip') || '';

                return skip;
            }

            function setSkip() {
                localStorage.setItem('elwiki.timebug.skip', 1);
            }

            function deleteSkip() {
                localStorage.removeItem('elwiki.timebug.skip');
            }

            // Clean cache on save
            document
            .getElementById('wpSave')
            .addEventListener('click', function() {
                deleteCache();
                setSkip();
            });

            // Save cache on unload
            window
            .addEventListener('beforeunload', function() {
                if(!getSkip()) {
                    setCache();
                }

                deleteSkip();
            });

            // Replace wikitext on load
            (function() {
                var cache = getCacheEntry();

                if(cache) {
                    if(confirm('You have cached wikitext. Do you want to restore?')) {
                        setWikiText(cache);
                    } else if(confirm('You did not use the cache. Do you want to discard?')) {
                        deleteCache();
                        setSkip();
                    }
                }
            })();
        }
    }
})();