Ruby Documentation through rdoc

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There are three vital elements in any code of significnat size that you write.
• There's the code itself
• There are programmer's comments which provide an overview of the internals and remarks on how you've done things, why certain decisions were made, known issues for future maintainers, etc
• There's user documentation. The "user" may be a person running your complete applicaton, or may be a programmer who uses your classes / module / methods within his encompassing application.

Supplied with Ruby, you have rdoc which provides you with a tool to extract and format information from your source files and turn it into documentation.

Here's a brief example of rdoc at work. A previous example (food.rb) in which I demostrated a simple class includes a block comment - a section that runs from =begin to =end:

  =begin

  This is a single class in Ruby - we've set up the

  constructor and an accessor method. We've also

  declared that the @itisa member should be accessible

  as a read only property.

  

  See the multifood.rb example for a much extended

  version of this demonstration

  =end

That block comment, in additon to other elements, will be picked up by rdoc and used to generate HTML documentation. Let's see how that generates:

  munchkin:r108 grahamellis$ rdoc food.rb

  Parsing sources...

  100% [ 1/ 1]  food.rb                                                           

  

  Generating Darkfish format into /Library/WebServer/trainee/r108/doc...

  

  Files:      1

  

  Classes:    1 (0 undocumented)

  Modules:    0 (0 undocumented)

  Constants:  0 (0 undocumented)

  Attributes: 1 (1 undocumented)

  Methods:    2 (2 undocumented)

  

  Total:      4 (3 undocumented)

   25.00% documented

  

  Elapsed: 0.2s

  munchkin:r108 grahamellis$

And when viewed, you'll see the following:

Documentation is vital in any software project - on our courses, this is stressed right from the first "Hello World" example - the first working program. We run public Ruby courses (different courses for delegates with different backgrounds) at our training centre and hotel in Melksham, Wiltshire and will run private courses on your site if you've got a group of delegates.
(written 2012-07-07, updated 2012-07-14)

Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles

R119 - Ruby Miscellany
  [1181] Good Programming practise - where to initialise variables - (2007-05-09)
  [1586] Variable types in Ruby - (2008-03-21)
  [1720] Some Ruby lesser used functions - (2008-07-26)
  [1889] Ruby mixins, modules, require and include - (2008-11-16)
  [1890] MySQL database from Ruby - an example - (2008-11-16)
  [3155] Rake - a build system using code written in Ruby - (2011-02-03)
  [3428] How many days to Christmas? - (2011-09-09)
  [3622] Loading Ruby classes - where does Ruby look? - (2012-02-24)
  [3783] Load path, load and require in Ruby, and a change from 1.8 to 1.9 - (2012-06-24)

R050 - Ruby - General
  [2104] Ruby Programming and Rails - 4 different courses in one - (2009-03-26)
  [2227] Learning PHP, Ruby, Lua and Python - upcoming courses - (2009-06-11)
  [2504] Learning to program in ... - (2009-11-15)
  [2605] Ruby on Rails - a sample application to teach you how - (2010-01-30)
  [2826] Ruby - training for automated testing users - (2010-06-25)
  [2866] Ruby - how does it compare and where is it the right language? - (2010-07-11)
  [3158] Ruby training - some fresh examples for string handling applications - (2011-02-05)
  [4294] A bright new gem - updated Ruby training - (2014-09-16)
  [4583] Back in the saddle again - excellent open source course from Well House Consultants - (2015-11-26)

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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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