Add problem statement cloning to Grunt init task

Author: rdtsc

gruntfile.js

@@ -25,11 +25,13 @@ module.exports = function(grunt)
         sourcePath: './src/',
         problemListPath: './storage/problems.json',
         problemUrlFormat: 'https://www.codeeval.com/browse/%s/',
+        problemUrlFormatAlt: 'https://www.codeeval.com/public_sc/%s/',
         files:
         {
           meta: 'meta.yaml',
           input: 'input.txt',
           readme: 'readme.md',
+          mirror: 'readme.pdf',
           languages:
           {
             c:

package.json

@@ -12,6 +12,7 @@
     "js-yaml": "~3.2.6",
     "slug": "~0.8.0",
     "word-wrap": "~1.0.2",
-    "clui": "~0.3.1"
+    "clui": "~0.3.1",
+    "phantomjs-prebuilt": "2.1.12"
   }
 }

readme.md

@@ -106,6 +106,7 @@ Running "init-solution:1" (init-solution) task
 >> Created "solutions" directory in: src/easy/fizz-buzz
 >> Created meta.yaml in: src/easy/fizz-buzz
 >> Created readme.md in: src/easy/fizz-buzz
+>> Created readme.pdf in: src/easy/fizz-buzz
 >> Created input.txt in: src/easy/fizz-buzz
 >> Created solution.c in: src/easy/fizz-buzz/solutions/c
 >> Created solution.cpp in: src/easy/fizz-buzz/solutions/c++

tasks/init-solution.js

@@ -2,13 +2,15 @@ module.exports = function(grunt)
 {
   'use strict';
 
-  var path    = require('path');
-  var util    = require('util');
-  var request = require('request');
-  var cheerio = require('cheerio');
-  var yaml    = require('js-yaml');
-  var slug    = require('slug');
-  var wrap    = require('word-wrap');
+  var path     = require('path');
+  var util     = require('util');
+  var execFile = require('child_process').execFileSync;
+  var request  = require('request');
+  var cheerio  = require('cheerio');
+  var phantom  = require('phantomjs-prebuilt').path;
+  var yaml     = require('js-yaml');
+  var slug     = require('slug');
+  var wrap     = require('word-wrap');
 
   require('array.prototype.find');
   require('./lib/to-title-case');
@@ -23,6 +25,7 @@ module.exports = function(grunt)
     this.requiresConfig([this.name, 'config', 'files', 'input']);
     this.requiresConfig([this.name, 'config', 'files', 'meta']);
     this.requiresConfig([this.name, 'config', 'files', 'readme']);
+    this.requiresConfig([this.name, 'config', 'files', 'mirror']);
 
     var config = grunt.config([this.name, 'config']);
 
@@ -75,6 +78,7 @@ module.exports = function(grunt)
     {
       meta:      path.join(solutionDir, config.files.meta),
       readme:    path.join(solutionDir, config.files.readme),
+      mirror:    path.join(solutionDir, config.files.mirror),
       input:     path.join(solutionDir, config.files.input),
       solutions: path.join(solutionDir, 'solutions')
     };
@@ -153,6 +157,38 @@ module.exports = function(grunt)
       grunt.log.ok('Created ' + config.files.readme + ' in: ' + solutionDir);
     })();
 
+    // Mirror problem statement.
+    (function()
+    {
+      if(!grunt.option('overwrite') && grunt.file.isFile(paths.mirror))
+      {
+        grunt.log.writeln('Skipped ' + config.files.mirror +
+                          ' -- already exists in: ' + solutionDir);
+
+        return;
+      }
+
+      try
+      {
+        var job =
+        [
+          './tools/mirror-problem-statement/rasterize.js',
+          util.format(config.problemUrlFormatAlt, problemId),
+          path.resolve(paths.mirror)
+        ];
+
+        execFile(phantom, job);
+
+        grunt.log.ok('Created ' + config.files.mirror + ' in: ' + solutionDir);
+      }
+
+      catch(error)
+      {
+        grunt.fatal('Failed to mirror problem statement; ' +
+                    'rasterizer return code -> ' + error.status);
+      }
+    })();
+
     // Make solution templates.
     function makeSolutionTemplates(problemHasInput)
     {

tools/mirror-problem-statement/patch.css

@@ -0,0 +1,58 @@
+html, body
+{
+  zoom: 0.78125;
+  background: transparent;
+}
+
+#main-navigation,
+#header,
+#fdbk_tab,
+#footer,
+#main header,
+.backtolist,
+h3 + img,
+#map-canvas,
+[title="Login"]
+{
+  display: none;
+}
+
+#container
+{
+  margin: 0;
+  border: none;
+  background: transparent;
+}
+
+.browse-challenge-page .inner
+{
+  width: auto;
+}
+
+#ce-content
+{
+  padding: 0;
+}
+
+.public_content
+{
+  width: 100%;
+}
+
+h3
+{
+  margin-top: 2em;
+}
+
+p
+{
+  margin-bottom: 1.5em;
+}
+
+pre
+{
+  padding: 15px;
+  border: 1px solid #ccc;
+  background: transparent;
+  page-break-inside: avoid;
+}

tools/mirror-problem-statement/rasterize.js

@@ -0,0 +1,72 @@
+'use strict';
+
+var fs   = require('fs'),
+    sys  = require('system'),
+    page = require('webpage').create();
+
+function die()
+{
+  sys.stderr.write(Array.prototype.join.call(arguments, ' ') + '\n');
+  phantom.exit(1);
+}
+
+if(sys.args.length < 3)
+{
+  die(['Usage:', sys.args[0], 'URL', 'file'].join(' '));
+}
+
+page.paperSize =
+{
+  format: 'Letter',
+  orientation: 'portrait',
+  margin: '10mm'
+};
+
+page.onError = function() {};
+
+page.onResourceRequested = function(data, request)
+{
+  // Intercept and discard the Ace editor library since
+  // it renders code blocks as garbage in the PDF.
+  if(/ace_editor/i.test(data.url)) request.abort();
+};
+
+page.open(sys.args[1], function(status)
+{
+  if(status !== 'success')
+  {
+    die('Failed to load remote target.');
+  }
+
+  var styles = fs.read(fs.absolute(phantom.libraryPath +
+                                   fs.separator        +
+                                   'patch.css'));
+
+  page.evaluate(function(css)
+  {
+    // Inject override stylesheet.
+    $('<style>').text(css.replace(/;/g, '!important;')).appendTo('head');
+
+    // Remove empty elements that mess with vertical flow from some pages.
+    $('body *').filter(function()
+    {
+      var isEmpty  = (this.innerHTML.trim() === ''),
+          isTarget = (this.tagName.toLowerCase() in {h3: true, p: true});
+
+      return (isEmpty && isTarget);
+    }).remove();
+
+    // Remove challenge sponsor branding.
+    $('h3:contains("Sponsoring") + p').remove();
+    $('h3:contains("Sponsoring")').remove();
+
+    // Patch I/O sample blocks since we're not using Ace.
+    $('.description-input-output').contents().unwrap().wrap('<pre/>');
+  }, styles);
+
+  window.setTimeout(function()
+  {
+    page.render(sys.args[2]);
+    phantom.exit();
+  }, 1e3);
+});