Setup an open project plugin. Copy pasted over some of the code from the backlogs plugin to get a minimum pdf being rendered with prawn. Rigged it up to read in the config from new taskbord_card_configuration model. Just now only the page_size property is being used. This is a basic implementation of ticket 3501.

CHANGELOG.md

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+# Changelog
+
+* `#<ticket number>` Create plugin

README.md

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-openproject-pdf_export
-======================
+# OpenProject Pdf Export Plugin
 
-Exports work packages to PDF
+FIXME Add description and check issue tracker link below
+
+## Issue Tracker
+
+https://www.openproject.org/projects/pdf-export/issues

app/controllers/pdf_export_base_controller.rb

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+
+class PdfExportBaseController < ApplicationController
+  before_filter :load_default_config
+  before_filter :load_project
+
+  def load_default_config
+    @default_config = TaskboardCardConfiguration.first
+  end
+
+  def load_project
+    if params[:project_id]
+      @project = Project.find(params[:project_id])
+    end
+  end
+end

app/controllers/pdf_export_controller.rb

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+
+class PdfExportController < PdfExportBaseController
+  def index
+  end
+end

app/controllers/taskboard_cards_controller.rb

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+
+class TaskboardCardsController < PdfExportBaseController
+  include OpenProject::PdfExport::TaskboardCard
+
+  def index
+    work_packages = @project.work_packages
+    document = OpenProject::PdfExport::TaskboardCard::DocumentGenerator.new(@default_config, work_packages)
+
+    respond_to do |format|
+      format.pdf { send_data(document.render, :disposition => 'attachment', :type => 'application/pdf') }
+    end
+  end
+end

app/models/taskboard_card_configuration.rb

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+
+class TaskboardCardConfiguration < ActiveRecord::Base
+  #Note: rows is YAML text which we'll parse into a hash
+  attr_accessible :identifier, :name, :rows, :per_page, :page_size
+
+  def rows_hash
+    YAML::parse(rows)
+  end
+end

app/views/pdf_export/index.html.erb

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+<div class='contextual'></div>
+<h2>
+  Pdf Export Test
+</h2>
+<%= link_to @default_config.name, "taskboard_cards.pdf" %>

config/routes.rb

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+
+OpenProject::Application.routes.draw do
+
+  scope "", as: "pdf_export" do
+    scope "projects/:project_id", as: 'project' do
+      resources :pdf_export, :controller => :pdf_export, :only => [:index, :show]
+      resources :taskboard_cards, :controller => :taskboard_cards, :only => [:index]
+    end
+  end
+
+end

db/migrate/20140113132617_create_taskboard_card_configuration.rb

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+class CreateTaskboardCardConfiguration < ActiveRecord::Migration
+  def change
+    create_table :taskboard_card_configurations do |t|
+      t.string :identifier
+      t.string :name
+      t.text :rows
+      t.integer :per_page
+      t.string :page_size
+    end
+  end
+end

db/migrate/20140113141913_insert_default_taskboard_card_configuration.rb

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+class InsertDefaultTaskboardCardConfiguration < ActiveRecord::Migration
+  def up
+    TaskboardCardConfiguration.create!({
+      identifier: "DEFAULT",
+      name: "Default",
+      per_page: 1,
+      page_size: "A4",
+      rows: "rows:\n    row1:\n      has_border: false\n      columns:\n        column1:\n          has_label: false\n          property: \"id\"\n          font_size: \"15\""
+    })
+  end
+
+  def down
+    TaskboardCardConfiguration.delete_all
+  end
+end

lib/open_project/pdf_export.rb

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+module OpenProject
+  module PdfExport
+    require "open_project/pdf_export/engine"
+  end
+end

lib/open_project/pdf_export/engine.rb

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+# Prevent load-order problems in case openproject-plugins is listed after a plugin in the Gemfile
+# or not at all
+require 'open_project/plugins'
+
+module OpenProject::PdfExport
+  class Engine < ::Rails::Engine
+    engine_name :openproject_pdf_export
+
+    include OpenProject::Plugins::ActsAsOpEngine
+
+    register 'openproject-pdf_export',
+             :author_url => 'http://finn.de',
+             :requires_openproject => '>= 3.0.0pre13'
+
+  end
+end

lib/open_project/pdf_export/taskboard_card/document_generator.rb

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+require 'prawn'
+
+module OpenProject::PdfExport::TaskboardCard
+  class DocumentGenerator
+    attr_reader :config
+    attr_reader :work_packages
+    attr_reader :pdf
+
+    def initialize(config, work_packages)
+      @config = config
+      @work_packages = work_packages
+
+      page_layout = :landscape
+      @pdf = Prawn::Document.new(
+        :page_layout => page_layout,
+        :left_margin => 0,
+        :right_margin => 0,
+        :top_margin => 0,
+        :bottom_margin => 0,
+        :page_size => config["page_size"])
+    end
+
+    def render
+      # TODO RS: Define pdf page defaults, sizes, borders etc...
+      # pdf.start_new_page
+      render_rows
+
+      pdf.render
+    end
+
+    def render_rows
+      # TESTING: RENDER FIRST WORK PACKAGE
+      wp = work_packages.first
+      work_package_identification = "#{wp.type.name} ##{wp.id}"
+      offset = [0, pdf.bounds.height]
+      box = pdf.text_box(work_package_identification,
+        {:height => 20,
+         :at => offset,
+         :size => 20,
+         :padding_bottom => 5})
+
+      # TODO RS: Iterate over each row and render whatever specified
+      # work_packages.each_with_index do |wp, i|
+      #   config.rows_hash.each do |key, value|
+      #     render_row(wp, value)
+      #   end
+      # end
+    end
+
+    def render_row(work_package, row_hash)
+      row_hash.columns.each do |key, value|
+        render_column(value)
+      end
+    end
+
+    def render_column(column_hash)
+      # Do actual pdf rendering
+    end
+  end
+end

lib/open_project/pdf_export/version.rb

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+module OpenProject
+  module PdfExport
+    VERSION = "0.0.1"
+  end
+end

lib/openproject-pdf_export.rb

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+require 'open_project/pdf_export'

openproject-pdf_export.gemspec

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+# encoding: UTF-8
+$:.push File.expand_path("../lib", __FILE__)
+
+require 'open_project/pdf_export/version'
+# Describe your gem and declare its dependencies:
+Gem::Specification.new do |s|
+  s.name        = "openproject-pdf_export"
+  s.version     = OpenProject::PdfExport::VERSION
+  s.authors     = "Finn GmbH"
+  s.email       = "info@finn.de"
+  s.homepage    = "https://www.openproject.org/projects/pdf-export"  # TODO check this URL
+  s.summary     = 'OpenProject Pdf Export'
+  s.description = "FIXME"
+  s.license     = "FIXME" # e.g. "MIT" or "GPLv3"
+
+  s.files = Dir["{app,config,db,lib}/**/*"] + %w(CHANGELOG.md README.md)
+
+  s.add_dependency "rails", "~> 3.2.14"
+  s.add_dependency "openproject-plugins", "~> 1.0.5"
+end