57 lines
1.4 KiB
JavaScript
57 lines
1.4 KiB
JavaScript
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'use strict';
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const typeOf = require('kind-of');
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const getEngine = require('./engine');
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const defaults = require('./defaults');
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module.exports = function(file, data, options) {
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if (data == null && options == null) {
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switch (typeOf(file)) {
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case 'object':
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data = file.data;
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options = {};
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break;
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case 'string':
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return file;
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default: {
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throw new TypeError('expected file to be a string or object');
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}
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}
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}
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const str = file.content;
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const opts = defaults(options);
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if (data == null) {
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if (!opts.data) return file;
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data = opts.data;
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}
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const language = file.language || opts.language;
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const engine = getEngine(language, opts);
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if (typeof engine.stringify !== 'function') {
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throw new TypeError('expected "' + language + '.stringify" to be a function');
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}
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data = Object.assign({}, file.data, data);
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const open = opts.delimiters[0];
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const close = opts.delimiters[1];
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const matter = engine.stringify(data, options).trim();
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let buf = '';
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if (matter !== '{}') {
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buf = newline(open) + newline(matter) + newline(close);
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}
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if (typeof file.excerpt === 'string' && file.excerpt !== '') {
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if (str.indexOf(file.excerpt.trim()) === -1) {
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buf += newline(file.excerpt) + newline(close);
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}
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}
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return buf + newline(str);
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};
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function newline(str) {
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return str.slice(-1) !== '\n' ? str + '\n' : str;
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}
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