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TLDR: see the tutorial !

cl-torrents

Usage

This is a little tool for the lisp REPL to search for torrents on the Pirate Bay (piratebay.to):

(torrents "matrix")
  [...]
  6: The Matrix Revolutions (2003) BRRip [Dual Audio] [Hindi+Eng]
  5: Matrix (1999)Blu-Ray 720p Dublado PT-BR - mo93438
  4: The Matrix Trilogy (1999-2003) BDRip 1080p Dual Audio [ Hind
  3: The Matrix Trilogy (1999-2003) BluRay BDRip 1080p AC3
  2: The Matrix Trilogy (1999-2003) + Extras 1080p BluRay x264 Du
  1: The Matrix Reloaded (2003) FullHD, Dual Audio: English + Spa
  0: Matrix FRENCH DVDRIP 1999 COOL

We get a magnet link with:

(magnet 0)
;; "magnet:?xt=urn:btih:40eca43690cf1b99b0a4d485ebf4855d20b0bac5"

It could be more featureful. But our goal was to write a tutorial to show you diverse Common Lisp topics.

Tutorial

Writing this little web scraper is not difficult. Nevertheless, I had to spend some time to find out the right libraries and resources. It is also not trivial at first to start a Lisp project. So this tutorial is a mix of -we hope- useful stuff:

  • web scraping,
  • trying out things at the REPL,
  • creating and loading a project,
  • basic data structures and gotchas,
  • some useful libraries,
  • unit tests, with mocks,
  • where to find documentation,
  • …

    it could be more (building executables, sharing our software, more settings, working with a local copy of TPB…). In the meanwhile, read

    the tutorial !

Resources

Don’t miss these good resources:

Setting up a Common Lisp environment

The easiest solution of all is to try Portacle, a portable and multiplatform CL environment shipping: Emacs25 (slightly customized), SBCL, Quicklisp, Slime and Git.

Otherwise:

apt install sbcl

and install Quicklisp (two commands) and Slime for Emacs (in MELPA, with package.el) or try Atom-slime or Vim package. See the good resources.