Manipulating OOo Documents with Ruby
OpenOffice.org (OOo), a featureful suite of office tools that includes applications for word processing, spreadsheet creation and presentation authoring, has seen an increase in enhancements and overall quality. OOo lives up to its name by making both source code and file formats completely open. This is a big plus for anyone wishing to manipulate documents without needing to have the creator application present.
In general, two ways exist to access or manipulate document content. One is to automate the source application, letting a program substitute for a person entering commands. The other is to go directly to the document. An advantage of the first approach is you get to exploit the power of an existing application, saving yourself a good deal of time figuring out file formats and processing commands. OOo can execute internal macros and expose a scripting interface through UNO. The downside is you need to have the actual application handy, and even then it may not be able to do what you want. This article describes the second approach: accessing and manipulating documents by going directly to the source.
I first became aware of what could be done with an OpenOffice.org document when Daniel Carrera announced his OOoExtract program. This is a Ruby application that allows you to run command-line searches of OOo Writer document content. As the home page states, OOoExtract performs matches on both text content and styles, executes search patterns using full regular expressions and runs searches built with Boolean operators. The program runs on any platform that has a Ruby interpreter, and they are available for pretty much every OS around.
Ruby has been discussed before in Linux Journal, but if you are not familiar with it, a good though brief description might be to say it's a cross between Perl and Smalltalk, with some features from Lisp and Python. It is deeply object-oriented and has a clean intuitive syntax. Yukihiro “Matz” Matsumoto, its creator, released the first alpha version in 1994. It has grown steadily in popularity, and the Third International Ruby Conference was held in November 2003, in Austin, Texas.
To get a feel for OOoExtract, download the program; currently, you can get the application as a single executable file or as a tarball with constituent libraries in separate files. Once installed, we can create a simple Writer document and run some searches. If you have OOo handy, fire it up and enter some brief text, such as:
My sample document It has two lines
Save the file as sample1.sxw to the same directory where you installed OOoExtract, and run OOoExtract from the command line, like this:
./ooo_extract.rb --text sample sample1.sxw My sample document
The program searches sample1.sxw for any lines that match on the word sample. Actually, this is a regular expression, albeit a simple one. We also can use more complex expressions, such as this one that matches any three-letter word:
./ooo_extract.rb --text "\s\w\w\w\s" sample1.sxw It has two lines
This is all well and good, but OOoExtract really shines by letting us search on content metadata, the extra information about the text in our document. Suppose we add an additional line to our sample Writer document:
This one has some extra formatting
After entering the text, select the word extra and apply the Footer paragraph style. Save the file and run this search:
./ooo_extract.rb --style="Footer" sample1.sxw This one has some extra formatting
In addition to locating text based on content, OOoExtract also can give you text with specific markup. This is quite handy if you create your own semantically rich styles. You then can use OOoExtract to retrieve information based on content and meaning, effectively turning an OpenOffice.org Writer document into a lightweight database. You can run the program against multiple files by using wild cards in the filename. For example, suppose you store recipes in Writer files. If you've defined and used custom styles, you could locate specific information, such as what recipes have apples as an ingredient:
./ooo_extract.rb --text="apple" --style="Ingredient" recipes/*.sxw AppleSalsa.sxw: 2 medium red apples AppleStrudel.sxw: 4 cups peeled and sliced apples
Fast/Flexible Linux OS Recovery
On Demand Now
In this live one-hour webinar, learn how to enhance your existing backup strategies for complete disaster recovery preparedness using Storix System Backup Administrator (SBAdmin), a highly flexible full-system recovery solution for UNIX and Linux systems.
Join Linux Journal's Shawn Powers and David Huffman, President/CEO, Storix, Inc.
Free to Linux Journal readers.Register Now!
- The Qt Company's Qt Start-Up
- Devuan Beta Release
- May 2016 Issue of Linux Journal
- EnterpriseDB's EDB Postgres Advanced Server and EDB Postgres Enterprise Manager
- The US Government and Open-Source Software
- Open-Source Project Secretly Funded by CIA
- The Death of RoboVM
- The Humble Hacker?
- New Container Image Standard Promises More Portable Apps
- BitTorrent Inc.'s Sync
In modern computer systems, privacy and security are mandatory. However, connections from the outside over public networks automatically imply risks. One easily available solution to avoid eavesdroppers’ attempts is SSH. But, its wide adoption during the past 21 years has made it a target for attackers, so hardening your system properly is a must.
Additionally, in highly regulated markets, you must comply with specific operational requirements, proving that you conform to standards and even that you have included new mandatory authentication methods, such as two-factor authentication. In this ebook, I discuss SSH and how to configure and manage it to guarantee that your network is safe, your data is secure and that you comply with relevant regulations.Get the Guide