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    If you need a more gentle introduction into the ideas behind
    functional programming, you may find it in *[Higher-Order
    Perl](http://hop.perl.plover.com/)* by Mark Jason Dominus.  This book
    was written long before the functional-perl project was started, and
    does various details differently.

Please ask [me](http://leafpair.com/contact) if you'd like to meet up
in London, Berlin or Switzerland to get an introduction in person.


## Dependencies

* to use `bin/perlrepl`, `bin/fperl` or the repl in the intro and
  examples scripts interactively, `Term::ReadLine::Gnu` and
  `PadWalker` (and optionally `Eval::WithLexicals` if you want to use
  the :m/:M modes, and `Capture::Tiny` to see code definition location
  information and `Sub::Util` from `Scalar::List::Utils` to see
  function names when displaying code refs.)

* to run the test suite: `Test::Requires`

* to run all the tests (otherwise some are skipped): in addition to
  the above, Perl version >= 5.020, `Test::Pod::Snippets`,
  `BSD::Resource`, `Method::Signatures`, `Sub::Call::Tail`,
  `Text::CSV`, `DBD::CSV`, `Text::CSV`, `URI`, `Text::Markdown`,
  `Clone`. Some of these are also necessary to run `htmlgen/gen` (or
  `website/gen` to build the website), see
  [Htmlgen](htmlgen/README.md) for details.

* some examples also use: `JSON`

(Todo: should all of the above be listed in PREREQ_PM in Makefile.PL?)

You can run `meta/install-development-dependencies-on-debian` to get
those installed if you're on a Debian system.


## Installation

### From CPAN

Use your preferred CPAN installer, for example: `cpan
FunctionalPerl`. Note that this one installs the "runtime recommends"
dependencies as well, which is a lot (like e.g. DBI), so you may want
to look through the `Makefile.PL` or the list below and install what
you can from your Linux distribution or other binary package
repository first. Or if you don't want the recommends, set
`recommends_policy` in `$ENV{HOME}/.cpan/CPAN/MyConfig.pm` to 0, or
install the cpanminus tool and run `cpanm FunctionalPerl` which skips
recommends unless you pass the `--with-recommends` option.

### From the Git repository

    git clone https://github.com/pflanze/functional-perl.git
    cd functional-perl

    # to get the latest release, which is $FP_COMMITS_DIFFERENCE behind master:
    git checkout -b $FP_VERSION_UNDERSCORES $FP_VERSION

    # to verify the same against MitM attacks:
    gpg --recv-key 04EDB072
    git tag -v $FP_VERSION
    # You'll find various pages in search engines with my fingerprint,
    # or you may find a trust path through one of the signatures on my
    # older key 1FE692DA, that this one is signed with.

The bundled scripts modify the library load path to find the files
locally, thus no installation is necessary. All modules are in the
`lib/` directory, `export PERL5LIB=path/to/functional-perl/lib` is all
that's needed.

To install, run the usual `perl Makefile.PL; make test && make install`.

(The repository might be split into producing several separate CPAN
packages (or even repositories?) in the future, thus don't rely too
much on the installation process continuing to work the way it is
right now.)


## Reporting bugs, finding help, contributing

* Report bugs via either:

    * the [Github project](https://github.com/pflanze/functional-perl)

    * the "Issues" link on the the distribution's
      [metacpan page](https://metacpan.org/pod/FunctionalPerl).

* Find IRC and contact details on the [[mailing_list]] and [[contact]]
  pages. Check the [[design]] page to get an idea about the design
  principles if you'd like to write code to contribute.


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