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index.js
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Mon, Jan 6, 14:50

index.js
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const {
html,
oneLineTrim,
TemplateTag,
trimResultTransformer,
replaceResultTransformer
} = require('common-tags')
function template(ctx) {
const {
publicPath,
css,
js,
lang,
title,
favicon,
container,
head = {},
body = {},
attrs = {},
trimWhitespace
} = ctx
const doc = html`
<!DOCTYPE html>
${lang ? `<html lang="${lang}">` : '<html>'}
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>${title || 'sample-app'}</title>
${favicon && `<link rel="icon" type="image/x-icon" href="${favicon}">`}
${generateTags(head.meta, 'meta')}
${generateTags(head.links, 'link')}
${generateTags(head.style, 'style')}
${generateTags(head.scripts, 'script')}
${generateRawTags(head.raw)}
${webpackArtifacts(css, publicPath, attrs.css, 'link')}
</head>
<body>
${container && `<div id="${container}"></div>`}
${generateRawTags(body.raw)}
${generateTags(body.scripts, 'script')}
${webpackArtifacts(js, publicPath, attrs.js, 'script')}
</body>
</html>`
return trimWhitespace ? oneLineTrim(doc) : emptyLineTrim(doc)
}
function mapAttrs(tag) {
return Object.keys(tag)
.map(attr => `${attr}="${tag[attr]}"`)
.join(' ')
}
function generateTags(tags = [], type) {
const closing = type === ('script' || 'style') ? `></${type}>` : '>'
return tags.map(tag => `<${type} ${mapAttrs(tag)}${closing}`)
}
function generateRawTags(tags = []) {
if (typeof tags === 'string' || tags instanceof String) {
return tags
}
return tags.map(tag => tag)
}
function webpackArtifacts(files = [], publicPath = '', attrs = {}, type) {
const tag = file =>
type === 'script'
? Object.assign(attrs, { src: publicPath + file })
: Object.assign(attrs, { rel: 'stylesheet', href: publicPath + file })
return files.map(file => generateTags([tag(file)], type)).join('\n')
}
const emptyLineTrim = new TemplateTag(
replaceResultTransformer(/^\s*[\r\n]/gm, ''),
trimResultTransformer
)
module.exports = template

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