Add markdown-pdf option as config output (#270)

source/app/action/index.mjs

@@ -213,7 +213,7 @@
           info.break()
           info.group({metadata, name:"core", inputs:config})
           info("Plugin errors", die ? "(exit with error)" : "(displayed in generated image)")
-          const convert = ["jpeg", "png", "json", "markdown"].includes(config["config.output"]) ? config["config.output"] : null
+          const convert = ["jpeg", "png", "json", "markdown", "markdown-pdf"].includes(config["config.output"]) ? config["config.output"] : null
           Object.assign(q, config)
           if (/markdown/.test(convert))
             info("Markdown cache", _markdown_cache)

source/app/metrics/index.mjs

@@ -26,7 +26,7 @@
           const pending = []
           const {queries} = conf
           const data = {animated:true, base:{}, config:{}, errors:[], plugins:{}, computed:{}}
-          const imports = {plugins:Plugins, templates:Templates, metadata:conf.metadata, ...utils, ...(convert === "markdown" ? {imgb64(url, options) {
+          const imports = {plugins:Plugins, templates:Templates, metadata:conf.metadata, ...utils, ...(/markdown/.test(convert) ? {imgb64(url, options) {
             return options?.force ? utils.imgb64(...arguments) : url
           }} : null)}
           const experimental = new Set(decodeURIComponent(q["experimental.features"] ?? "").split(" ").map(x => x.trim().toLocaleLowerCase()).filter(x => x))
@@ -65,7 +65,7 @@
           }
 
         //Markdown output
-          if (convert === "markdown") {
+          if (/markdown/.test(convert)) {
             //Retrieving template source
               console.debug(`metrics/compute/${login} > markdown render`)
               let source = image
@@ -95,7 +95,10 @@
               for (const delimiters of [{openDelimiter:"<", closeDelimiter:">"}, {openDelimiter:"{", closeDelimiter:"}"}])
                 rendered = await ejs.render(rendered, {...data, s:imports.s, f:imports.format, embed}, {views, async:true, ...delimiters})
               console.debug(`metrics/compute/${login} > success`)
-            return {rendered, mime:"text/plain"}
+            //Output
+              if (convert === "markdown-pdf")
+                return imports.svg.pdf(await imports.marked(rendered), {paddings:q["config.padding"] || conf.settings.padding, style:(conf.settings.extras?.css ?? conf.settings.extras?.default ? q["extras.css"] ?? "" : "")})
+              return {rendered, mime:"text/plain"}
           }
 
         //Rendering

source/app/metrics/utils.mjs

@@ -23,7 +23,7 @@
   prism_lang()
 
 //Exports
-  export {fs, os, paths, url, util, processes, axios, git, opengraph, jimp, rss}
+  export {fs, os, paths, url, util, processes, axios, git, opengraph, jimp, rss, marked}
 
 /**Returns module __dirname */
   export function __module(module) {
@@ -238,6 +238,26 @@
 
 /**SVG utils */
   export const svg = {
+    /**Render as pdf */
+      async pdf(rendered, {paddings = "", style = ""} = {}) {
+        //Instantiate browser if needed
+          if (!svg.resize.browser) {
+            svg.resize.browser = await puppeteer.launch()
+            console.debug(`metrics/svg/pdf > started ${await svg.resize.browser.version()}`)
+          }
+        //Render through browser and print pdf
+          console.debug("metrics/svg/pdf > loading svg")
+          const page = await svg.resize.browser.newPage()
+          page.on("console", ({_text:text}) => console.debug(`metrics/svg/pdf > puppeteer > ${text}`))
+          await page.setContent(`<main class="markdown-body">${rendered}</main>`, {waitUntil:["load", "domcontentloaded", "networkidle2"]})
+          console.debug("metrics/svg/pdf > loaded svg successfully")
+          await page.addStyleTag({content:`main { margin: ${(Array.isArray(paddings) ? paddings : paddings.split(",")).join(" ")}; }${await fs.readFile(paths.join(__module(import.meta.url), "../../../node_modules", "@primer/css/dist/markdown.css")).catch(_ => "")}${style}`})
+          rendered = await page.pdf()
+        //Result
+          await page.close()
+          console.debug("metrics/svg/pdf > rendering complete")
+          return {rendered, mime:"application/pdf"}
+      },
     /**Render and resize svg */
       async resize(rendered, {paddings, convert}) {
         //Instantiate browser if needed

source/app/web/instance.mjs

@@ -261,7 +261,7 @@
                 graphql, rest, plugins, conf,
                 die:q["plugins.errors.fatal"] ?? false,
                 verify:q.verify ?? false,
-                convert:["jpeg", "png", "json", "markdown"].includes(q["config.output"]) ? q["config.output"] : null,
+                convert:["jpeg", "png", "json", "markdown", "markdown-pdf"].includes(q["config.output"]) ? q["config.output"] : null,
               }, {Plugins, Templates})
             //Cache
               if ((!debug)&&(cached)) {

source/plugins/core/metadata.yml

@@ -188,10 +188,11 @@ inputs:
     default: svg
     values:
       - svg
-      - png      # Does not support animations
-      - jpeg     # Does not support animations and transparency
-      - json     # Outputs a JSON file instead of an image
-      - markdown # Outputs a Markdown file instead of an image
+      - png          # Does not support animations
+      - jpeg         # Does not support animations and transparency
+      - json         # Outputs a JSON file instead of an image
+      - markdown     # Outputs a Markdown file instead of an image
+      - markdown-pdf # Outputs a Markdown file as PDF instead of an image
 
   # Number of retries in case rendering fail
   retries: