Add initial implementation of minigun report (#4)

- The command generates a self-contained HTML file with a summary of
  stats from the JSON file.
- HTML is written to minigun_report_xxxxxxx.json.html
- Resulting HTML is opened in user's default browser

bin/minigun

@@ -23,6 +23,11 @@ program
     'Set content-type (defaults to application/json)')
   .action(commands.quick);
 
+program
+  .command('report <file>')
+  .description('Create a report from a JSON file created by "minigun run"')
+  .action(commands.report);
+
 program
   .command('dino')
   .description('Show dinosaur of the day')

lib/commands/index.js

@@ -3,5 +3,6 @@
 module.exports = {
   run: require('./run'),
   quick: require('./quick'),
-  dino: require('./dino')
+  dino: require('./dino'),
+  report: require('./report')
 };

lib/commands/report.js

@@ -0,0 +1,25 @@
+'use strict';
+
+var fs = require('fs');
+var path = require('path');
+var l = require('lodash');
+var openfile = require('open');
+
+module.exports = report;
+
+function report(jsonReportPath) {
+  var data = JSON.parse(fs.readFileSync(jsonReportPath, 'utf-8'));
+  var templateFn = path.join(
+    path.dirname(__filename),
+    '../report/index.html.ejs');
+  var template = fs.readFileSync(templateFn, 'utf-8');
+  var compiledTemplate = l.template(template);
+  var html = compiledTemplate({report: JSON.stringify(data, null, 2)});
+  var reportFilename = jsonReportPath + '.html';
+  fs.writeFileSync(
+    reportFilename,
+    html,
+    {encoding: 'utf-8', flag: 'w'});
+  console.log('Report generated: %s', reportFilename);
+  openfile(reportFilename);
+}