adds PDF generation

Signed-off-by: Kevin Griffin <griffin.kev@gmail.com>

README.md

@@ -30,14 +30,7 @@ Be sure to remove references to `specification-template` in favor of your new sp
 
 ### Experimental PDF generation
 
-To output a PDF (on macOS, requires Python)
-
-`# brew install pandoc`
-`# brew install librsvg homebrew/cask/basictex`
-
-`# python combine.py`
-`# chmod +x pdf.sh`
-`# ./pdf.sh`
+Run `npm run pdf` to render the pdf.
 
 #### Contributing
 

index.js

@@ -266,6 +266,27 @@ module.exports = function(options = {}) {
       }
     }
 
+   if (options.pdf) {
+      const path = require('path');
+      const mdToPdf = require('md-to-pdf');
+
+      var buf;
+      config.specs.forEach(spec => { 
+        spec.markdown_paths.map(p => {
+          buf += fs.readFileSync(spec.spec_directory + path.sep + p);
+          buf += '\n\n';
+        });
+
+        console.log(spec);
+        let title = spec.title
+        (async () => {
+          await mdToPdf({ content: buf }, { dest: 'output.pdf' }).catch(console.error);
+        })().then(() => {
+          process.exit(0);
+        }).catch(() => process.exit(1));
+      });
+    }
+
     config.specs.forEach(spec => {
       spec.spec_directory = normalizePath(spec.spec_directory);    
       spec.destination = normalizePath(spec.output_path || spec.spec_directory);