zulip/static/js/compose_state.js

var compose_state = (function () {

var exports = {};

var message_type = false; // 'stream', 'private', or false-y

exports.set_message_type = function (msg_type) {
    message_type = msg_type;
};

exports.get_message_type = function () {
    return message_type;
};

exports.composing = function () {
    // This is very similar to get_message_type(), but it returns
    // a boolean.
    return !!message_type;
};

exports.focus_in_empty_compose = function () {
    return (
        exports.composing() &&
        exports.message_content() === "" &&
        $('#new_message_content').is(':focus'));
};

function get_or_set(fieldname, keep_leading_whitespace) {
    // We can't hoist the assignment of 'elem' out of this lambda,
    // because the DOM element might not exist yet when get_or_set
    // is called.
    return function (newval) {
        var elem = $('#'+fieldname);
        var oldval = elem.val();
        if (newval !== undefined) {
            elem.val(newval);
        }
        return keep_leading_whitespace ? util.rtrim(oldval) : $.trim(oldval);
    };
}

// TODO: Break out setters and getter into their own functions.
exports.stream_name     = get_or_set('stream');
exports.subject         = get_or_set('subject');
// We can't trim leading whitespace in `new_message_content` because
// of the indented syntax for multi-line code blocks.
exports.message_content = get_or_set('new_message_content', true);
exports.recipient       = get_or_set('private_message_recipient');

exports.has_message_content = function () {
    return exports.message_content() !== "";
};

exports.insert_syntax_and_focus = function (syntax) {
    // Generic helper for inserting syntax into the main compose box
    // where the cursor was and focusing the area.  Mostly a thin
    // wrapper around $.caret.
    var textarea = $('#new_message_content');
    textarea.caret(syntax);
    textarea.focus();
};

return exports;
}());

if (typeof module !== 'undefined') {
    module.exports = compose_state;
}