MediaWiki:Gadget-ForcedUndoSummary.js

注意：在发布之后，您可能需要清除浏览器缓存才能看到所作出的变更的影响。

Firefox或Safari：按住Shift的同时单击刷新，或按Ctrl-F5或Ctrl-R（Mac为⌘-R）
Google Chrome：按Ctrl-Shift-R（Mac为⌘-Shift-R）
Internet Explorer或Edge：按住Ctrl的同时单击刷新，或按Ctrl-F5
Opera：按 Ctrl-F5。

(function() {
    const urlParams = new URLSearchParams(window.location.search);
    if (mw.config.get('wgAction') === 'edit' && urlParams.has('undoafter') && urlParams.has('undo')) {
        const saveBtn = document.getElementById('wpSave');
        const editSummaryField = document.getElementById('wpSummary');
        const summaryVal = editSummaryField.value;
        const saveVal = saveBtn.value;
        const regex = /\[\[Special:Contributions\/([^|]+)\|[^|]+\]\]/;
        const match = summaryVal.match(regex);

        if (match && match[1]) {
            const username = match[1];
            if (mw.config.get('wgUserName') !== username) {
                editSummaryField.value = '';
                editSummaryField.placeholder = '请填写撤销理由，不少于5个字。';
                disableBtn(saveBtn);
                editSummaryField.addEventListener('input', function() {
                    if (editSummaryField.value.length >= 5 && !areAllCharactersSame(editSummaryField.value)) {
                        saveBtn.disabled = false;
                        saveBtn.value = saveVal;
                        saveBtn.parentNode.classList.remove('oo-ui-widget-disabled');
                        saveBtn.parentNode.classList.add('oo-ui-widget-enabled', 'oo-ui-flaggedElement-progressive', 'oo-ui-flaggedElement-primary');
                    } else {
                        disableBtn(saveBtn);
                    }
                });
            }
        }
    }

    function disableBtn(saveBtn) {
        saveBtn.disabled = true;
        saveBtn.value = '请填写撤销理由';
        saveBtn.parentNode.classList.remove('oo-ui-widget-enabled', 'oo-ui-flaggedElement-progressive', 'oo-ui-flaggedElement-primary');
        saveBtn.parentNode.classList.add('oo-ui-widget-disabled');
    }
    
    function areAllCharactersSame(str) {
        const trimmedString = str.trim().replace(/[，。？！,.;!?]/g, '');
        const uniqueCharacters = trimmedString.split('').filter(function (value, index, self) {
            return self.indexOf(value) === index;
        });
        return uniqueCharacters.length === 1;
	}
})();