80 lines
2.1 KiB
JavaScript
80 lines
2.1 KiB
JavaScript
const gulp = require('gulp');
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const { src, dest } = require("gulp");
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const through = require("through2");
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const build = require('./build');
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// gulp task
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function json() {
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return src(build.config.path.src + '/nav.json')
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.pipe(
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through.obj((file, enc, cb) => {
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// get content of json file
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const rawJSON = file.contents.toString();
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// parse raw json into javscript object
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const parsed = JSON.parse(rawJSON);
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// transform json into desired shape
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const transformed = transformJson(parsed);
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// make string from javascript obj
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const stringified = JSON.stringify(transformed, null, 2);
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// make bufer from string and attach it as current file content
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file.contents = Buffer.from(stringified);
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// pass transformed file into next gulp pipe
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cb(null, file);
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})
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)
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.pipe(dest("dest"));
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}
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// transformation
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function transformJson(input) {
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const result = { nav: {} };
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// read json field by field
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Object.keys(input).forEach(topLevelKey => {
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// current object
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const topLevelItem = input[topLevelKey];
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// in your design topLevelItems are arrays
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topLevelItem.forEach(menuItem => {
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if (menuItem.title) {
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// make url either from item href or title
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const itemUrl = makeUrl(menuItem.href || menuItem.title);
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result.nav[itemUrl] = menuItem.title;
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}
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// prcoess children
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if (menuItem.items) {
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menuItem.items
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.filter(child => !!child.title) // process only child items with title
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.forEach(child => {
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const childUrl = makeUrl(child.href || child.title);
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result.nav[childUrl] = child.title;
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});
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}
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});
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});
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return result;
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}
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// helper func
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function makeUrl(href) {
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return href
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.toLowerCase()
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.replace(/\.html$/, "")
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.replace(/\s/g, "_");
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}
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// export for use in command line
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exports.json = json;
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gulp.task('build-lang', function (done) {
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json();
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done();
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});
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