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path = require(\"path\");\nconst { loadMeta } = require(\"@patternplate/load-meta\");\nconst AggregateError = require(\"aggregate-error\");\nconst fromString = require(\"require-from-string\");\nconst sander = require(\"@marionebl/sander\");\nconst unindent = require(\"unindent\");\nconst stringHash = require(\"string-hash\");\n\nmodule.exports = demo;\n\nconst BUNDLE_PATH = \"/patternplate.node.components.js\";\nconst RENDER_PATH = \"/patternplate.node.render.js\";\n\nasync function demo(options) {\n return async function demoRoute(req, res) {\n try {\n const { entry = [] } = options.config;\n const { cwd } = options;\n\n const id = req.params[0];\n\n // TODO: Send errors to central observer\n const { patterns } = await loadMeta({\n cwd,\n entry\n });\n\n const found = patterns.find(pattern => pattern.id === id);\n\n if (!found) {\n return res.sendStatus(404);\n }\n\n const { fs } = await wait(options.queue);\n\n const getModule = fromFs(fs);\n const bundle = getModule(BUNDLE_PATH);\n const component = getComponent(bundle, found);\n const context = getContext(found);\n const render = component.render || getModule(RENDER_PATH);\n const content = await Promise.resolve(render(component, context));\n res.send(html(content, found));\n } catch (err) {\n const error = Array.isArray(err) ? new AggregateError(err) : err;\n console.error(error);\n res.status(500).send(error.message);\n }\n };\n}\n\n// Todo: Provide basic description\nfunction wait(observable) {\n return new Promise((resolve, reject) => {\n const [message = {}] = observable.queue;\n switch (message.type) {\n case 'done':\n return resolve(message.payload);\n case 'error':\n return reject(message.payload);\n }\n\n observable.subscribe(\n queue => {\n const [message] = queue;\n switch (message.type) {\n case 'done':\n return resolve(message.payload);\n case 'error':\n return reject(message.payload);\n }\n },\n reject\n )\n });\n}\n\nfunction getComponent(components, data) {\n const fileId = data.artifact.split(path.sep).join('/');\n const top = components[fileId];\n\n const moduleId = data.source.split(path.sep).join('/');\n if (top[moduleId]) {\n return top[moduleId];\n }\n\n return top;\n}\n\nfunction getContext(pattern) {\n return {\n dirname: path.dirname(pattern.path)\n };\n}\n\nfunction fromFs(fs) {\n return filename => {\n const componentBundleSource = String(fs.readFileSync(filename));\n return getExports(componentBundleSource, filename);\n };\n}\n\nconst exportsCache = new Map();\n\nfunction getExports(source, { filename }) {\n const hash = stringHash(source);\n\n if (!exportsCache.has(hash)) {\n exportsCache.set(hash, fromString(source, filename));\n }\n\n return exportsCache.get(hash);\n}\n\nfunction html(content, payload) {\n const data = encodeURIComponent(JSON.stringify(payload));\n\n return unindent(`\n <!doctype html>\n <html lang=\"en\">\n <head>\n <!-- content.head -->\n ${content.head || \"\"}\n <style>\n /* content.css */\n ${content.css || \"\"}\n </style>\n </head>\n <body>\n <textarea style=\"display: none;\" data-patternplate-vault=\"data-patternplate-vault\">${data}</textarea>\n <!-- content.before -->\n ${content.before || \"\"}\n <!-- content.html -->\n <div data-patternplate-mount=\"data-patternplate-mount\">${content.html || \"\"}</div>\n <!-- content.after -->\n ${content.after || \"\"}\n <!-- ../ -> /api/ -->\n <script src=\"../patternplate.web.components.js\"></script>\n <script src=\"../patternplate.web.probe.js\"></script>\n <script src=\"../patternplate.web.mount.js\"></script>\n <script src=\"../patternplate.web.demo.js\"></script>\n </body>\n </html>\n `);\n}\n\n"]} |