CodeMirror Hotkeys for Bold and Italic

codemirror-0.js

editor.addKeyMap({
    // bold
    'Ctrl-B': function(cm) {
        var s = cm.getSelection(),
            t = s.slice(0, 2) === '**' && s.slice(-2) === '**';
        cm.replaceSelection(t ? s.slice(2, -2) : '**' + s + '**', 'around');
    },
    // italic
    'Ctrl-I': function(cm) {
        var s = cm.getSelection(),
            t = s.slice(0, 1) === '_' && s.slice(-1) === '_';
        cm.replaceSelection(t ? s.slice(1, -1) : '_' + s + '_', 'around');
    },
    // code
    'Ctrl-K': function(cm) {
        var s = cm.getSelection(),
            t = s.slice(0, 1) === '`' && s.slice(-1) === '`';
        cm.replaceSelection(t ? s.slice(1, -1) : '`' + s + '`', 'around');
    }
});