NAME

HACKING.pod - contributing to TAP::Harness

ABOUT

This is the guide for TAP::Harness internals contributors (developers, testers, documenters.)

If you are looking for more information on how to use TAP::Harness, you probably want http://testanything.org/testing-with-tap/perl/tap::parser-cookbook.html instead.

Getting Started

See the resources section in META.yml or Build.PL for links to the project mailing list, bug tracker, svn repository, etc.

For ease of reference, at the time of writing the SVN repository was at:

http://svn.hexten.net/tapx

To get the latest version of trunk:

git clone git://github.com/Perl-Toolchain-Gang/Test-Harness.git

For best results, read the rest of this file, check RT for bugs which scratch your itch, join the mailing list, etc.

Formatting

perltidy

The project comes with a .perltidyrc, which perltidy will automatically use if the project root is your working directory. This is setup by default to read and write the perl code on a pipe. To configure your editor:

• vim

  In .vimrc, you can add the following lines:

  nnoremap <Leader>pt :%!perltidy -q<cr> " only work in 'normal' mode
  vnoremap <Leader>pt :!perltidy -q<cr>  " only work in 'visual' mode

  In other words, if your Leader is a backslash, you can type \pt to reformat the file using the .perltidyrc. If you are in visual mode (selecting lines with shift-v), then only the code you have currently have selected will be reformatted.

• emacs

  For emacs, you can use this snippet from Sam Tregar (http://use.perl.org/~samtregar/journal/30185):

  (defun perltidy-region ()
     "Run perltidy on the current region."
     (interactive)
     (save-excursion
       (shell-command-on-region (point) (mark) "perltidy -q" nil t)
       (cperl-mode)))
  
  (defun perltidy-all ()
     "Run perltidy on the current region."
     (interactive)
     (let ((p (point)))
       (save-excursion
         (shell-command-on-region (point-min) (point-max) "perltidy -q" nil t)
         )
       (goto-char p)
       (cperl-mode)))
  
  (global-set-key "\M-t" `perltidy-region)
  (global-set-key "\M-T" `perltidy-all) 

Tests and Coverage

...

Writing for Compatibility

...

Use TAP::Object

TAP::Object is the common base class to all TAP::* modules, and should be for any that you write.

Exception Handling

Exceptions should be raised with Carp:

require Carp;
Carp::croak("Unsupported syntax version: $version");

require Carp;
Carp::confess("Unsupported syntax version: $version");

Deprecation cycle

Any documented sub that needs to be changed or removed (and would therefore cause a backwards-compat issue) must go through a deprecation cycle to give developers a chance to adjust:

1. Document the deprecation
2. Carp a suitable message
3. Release
4. Change the code
5. Release

Documentation

The end-user and API documentation is all in the 'lib/' directory. In .pm files, the pod is "inline" to the code. See perlpod for more about pod.

Pod Commands

For compatibility's sake, we do not use the =head3 and =head4 commands.

=head1 SECTION

Sections begin with an =head1 command and are all-caps.

NAME
VERSION
SYNOPSIS
CONSTRUCTOR
METHODS
CLASS METHODS
SOME OTHER SORT OF METHODS
SEE ALSO

=head2 method

The =head2 command documents a method. The name of the method should have no adornment (e.g. don't C<method> or C<method($list, $of, $params)>.)

These sections should begin with a short description of what the method does, followed by one or more examples of usage. If needed, elaborate on the subtleties of the parameters and context after (and/or between) the example(s).

=head2 this_method

This method does some blah blah blah.

  my @answer = $thing->this_method(@arguments);

=head2 that_thing

Returns true if the thing is true.

  if($thing->that_thing) {
    ...
  }

=item parameter

Use =item commands for method arguments and parameters (and etc.) In most html pod formatters, these do not get added to the table-of-contents at the top of the page.

Pod Formatting Codes

L<Some::Module>

Be careful of the wording of L<Some::Module>. Older pod formatters would render this as "the Some::Module manpage", so it is best to either word your links as "(see <Some::Module> for details.)" or use the "explicit rendering" form of "<Some::Module|Some::Module>".

VERSION

The version numbers are updated by Perl::Version.

DEVELOPER DOCS/NOTES

The following "formats" are used with =begin/=end and =for commands for pod which is not part of the public end-user/API documentation.

note

Use this if you are uncertain about a change to some pod or think it needs work.

=head2 some_method

  ...

=for note
  This is either falsely documented or a bug -- see ...

developer

=begin developer

Long-winded explanation of why some code is the way it is or various
other subtleties which might incite head-scratching and WTF'ing.

=end developer

deprecated

=for deprecated
  removed in 0.09, kill by ~0.25

Committing to Subversion

If you have commit access, please bear this in mind.

Development is done either on trunk or a branch, as appropriate:

If it's something that might be controversial, break the build or take a long time (more than a couple of weeks) to complete then it'd probably be appropriate to branch. Otherwise it can go in trunk.

If in doubt discuss it on the mailing list before you commit.

cpanm Test::Harness

perl -MCPAN -e shell
install Test::Harness