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import dateformat from 'dateformat';
/**
* Pre-defined functions which can be used as template functions.
* When these functions are applied to the current page, it uses page + templates + params as its context.
*
* @param {String} page: current page which these functions will be applied to
* @param {Object} templates: compiled jazz templates
* @param {Object} params: template parameters (including user-defined parameters and custom functions)
*/
function funcs(page, templates, params) {
/**
* Display the current date in specified format.
* Default to ISO date when format is not specified.
*
* @param {String} format: date format (felixge/node-dateformat)
* @param {Function} cb: jazz cb(data) callback
*/
function date(format, cb) {
cb(dateformat(new Date(), format || 'isoDateTime'));
}
/**
* Include a partial template in the current page.
* An error message will be included when partial does not exist.
*
* @param {String} partial: partial template file to include
* @param {Function} cb: jazz cb(data) callback
*/
function include(partial, cb) {
cb((params.partials && params.partials[partial]) ?
params.partials[partial] :
'[error] partial ' + partial + ' does not exist');
}
/**
* Prefix path with one ../ for each parent directory of the page.
* This is used to construct static links from various directory level in the website.
*
* @param {String} path: a URL path in the site navigation
* @param {Function} cb: jazz cb(data) callback
*/
function relative(path, cb) {
let value = path;
for (let i = 0, ln = page.length; i < ln; i += 1) {
if (page.charAt(i) === '/') {
value = '../' + value;
}
}
cb(value);
}
/**
* Display current page's sitemap title.
*
* @param {Function} cb: jazz cb(data) callback
*/
function title(cb) {
cb((params.sitemap && params.sitemap[page]) ?
params.sitemap[page].title :
'[error] page ' + page + ' does not have any sitemap title');
}
return {
date: date,
include: include,
relative: relative,
title: title
};
}
export {
funcs as default
};
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