Web Development with Clojure: Build Bulletproof Web Apps with Less Code by Dmitri Sotnikov

Author:Dmitri Sotnikov [Sotnikov, Dmitri]
Language: eng
Format: azw3, pdf
Tags: Pragmatic Bookshelf
Publisher: Pragmatic Bookshelf
Published: 2016-07-14T04:00:00+00:00

Generating the Reports

The clj-pdf library uses syntax similar to Hiccup’s to define the elements in the document. The document itself is represented by a vector. The document vector must contain a map representing the metadata as its first element. The metadata is followed by one or more elements representing the document’s content.

Let’s create a namespace called reporting-example.reports and look at a few examples of creating PDF documents. We’ll use the pdf function to create the reports and the template macro to format the input data. We’ll also reference the reporting-example.db.core namespace so that we can call the read-employees function later on.

reporting-example/src/clj/reporting_example/reports.clj

​ (ns reporting-example.reports

​ (:require [reporting-example.db.core :as db]

​ [clj-pdf.core :refer [pdf template]]))

The pdf function accepts two arguments. The first can be either a vector representing the document or an input stream from which the elements are read. The second can either be a string representing the output file name or an output stream.

Let’s generate our first PDF by running the following code in the reporting-example.reports namespace:

​ (pdf

​ [{:header ​"Wow, that was easy"​}

​ [:list

​ [:chunk {:style :bold} ​"a bold item"​]

​ ​"another item"​

​ ​"yet another item"​]

​ [:paragraph ​"I'm a paragraph!"​]]

​ ​"doc.pdf"​)

As you can see, the report consists of vectors, each starting with a keyword identifying the type of element, followed by the metadata and the content. In the preceding report we have a list that contains three rows, followed by a paragraph. The PDF will be written to a file called doc.pdf in our project’s root. The contents of the file should look like the following figure:

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