Added pagination start page

Added an option to the generation script to dictate on which page the page numbering should start. Option name is paginationStartPage and is 1 based (to start pagination at page 2, the value would be 2)

Author: mdelorimier

lib/scripts/pdf_a4_portrait.js

@@ -144,6 +144,7 @@ function getContent (page) {
 // Creates page section
 // --------------------
 function createSection (section, content, options) {
+  var opts = options
   options = options[section] || {}
   var c = content[section] || {}
   var o = options.contents
@@ -153,11 +154,19 @@ function createSection (section, content, options) {
     height: options.height,
     contents: phantom.callback(function (pageNum, numPages) {
       var html = o[pageNum] || c[pageNum]
+
+      var pageNumFinal = pageNum, numPagesFinal = numPages;
+      if(opts.paginationStartPage && opts.paginationStartPage > 1) {
+        var pageOffset = opts.paginationStartPage - 1;
+        pageNumFinal = (pageNumFinal - pageOffset > 0 ? pageNumFinal - pageOffset : '');
+        numPagesFinal -= pageOffset;
+      }
+
       if (pageNum === 1 && !html) html = o.first || c.first
       if (pageNum === numPages && !html) html = o.last || c.last
       return (html || o.default || c.default || '')
-        .replace(/{{page}}/g, pageNum)
-        .replace(/{{pages}}/g, numPages) + content.styles
+        .replace(/{{page}}/g, pageNumFinal)
+        .replace(/{{pages}}/g, numPagesFinal) + content.styles
     })
   }
 }