Manual preview cut for {{content}} helper in Ghost platform

index-content.js

// ### Content Helper
//
// *Usage example:*
// `{{content}}`
// `{{content words="20"}}`
// `{{content characters="256"}}`
// `{{content preview="true"}}`
//
// Turns content html into a safestring so that the user doesn't have to
// escape it or tell handlebars to leave it alone with a triple-brace.
//
// Enables tag-safe truncation of content by characters or words.
//
// If preview option is used then only the content before <!--preview--> is returned.
//
// **returns** SafeString content html, complete or truncated.
//
coreHelpers.content = function (options) {
    var truncateOptions = (options || {}).hash || {};
    truncateOptions = _.pick(truncateOptions, ['words', 'characters', 'preview']);
    _.keys(truncateOptions).map(function (key) {
        truncateOptions[key] = parseInt(truncateOptions[key], 10);
    });

    if (truncateOptions.hasOwnProperty('words') || truncateOptions.hasOwnProperty('characters')) {
        // Due to weirdness in downsize the 'words' option
        // must be passed as a string. refer to #1796
        // TODO: when downsize fixes this quirk remove this hack.
        if (truncateOptions.hasOwnProperty('words')) {
            truncateOptions.words = truncateOptions.words.toString();
        }
        return new hbs.handlebars.SafeString(
            downsize(this.html, truncateOptions)
        );
    } else if (truncateOptions.hasOwnProperty('preview')) {
        var split = this.html.split('<!--preview-->', 2)
        var output = split[0]
        if (split[1]) {
            output += '<div class="continue">● ● ●</div>'
        }
        return new hbs.handlebars.SafeString(output)
    }

    return new hbs.handlebars.SafeString(this.html);
};