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diff --git a/HACKING b/HACKING index 1e742c8454..41838ee816 100644 --- a/HACKING +++ b/HACKING @@ -2,141 +2,20 @@ #+TITLE: Hacking GNU Guix and Its Incredible Distro -Copyright © 2012, 2013, 2014, 2015 Ludovic Courtès <ludo@gnu.org> -Copyright © 2013 Nikita Karetnikov <nikita@karetnikov.org> -Copyright © 2014 Pierre-Antoine Rault <par@rigelk.eu> +Copyright © 2012, 2013, 2014 Ludovic Courtès <ludo@gnu.org> +Copyright © 2015 Mathieu Lirzin <mthl@openmailbox.org> Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved. +* Contributing -* Building from Git +See the manual for useful hacking informations, either by running -When building Guix from a checkout, the following packages are required in -addition to those mentioned in the installation instructions: + info -f doc/guix.info "(guix) Contributing" - - [[http://www.gnu.org/software/autoconf/][GNU Autoconf]] - - [[http://www.gnu.org/software/automake/][GNU Automake]] - - [[http://www.gnu.org/software/gettext/][GNU Gettext]] - - [[http://www.graphviz.org/][Graphviz]] - - [[http://www.gnu.org/software/help2man/][GNU Help2man]] (optional) - -Run ‘./bootstrap’ to download the Nix daemon source code and to generate the -build system infrastructure using autoconf. It reports an error if an -inappropriate version of the above packages is being used. - -If you get an error like this one: - - configure.ac:46: error: possibly undefined macro: PKG_CHECK_MODULES - -it probably means that Autoconf couldn’t find ‘pkg.m4’, which is provided by -pkg-config. Make sure that ‘pkg.m4’ is available. For instance, if you -installed Automake in ‘/usr/local’, it wouldn’t look for ‘.m4’ files in -‘/usr/share’. So you have to invoke the following command in that case - - $ export ACLOCAL_PATH=/usr/share/aclocal - -See “info '(automake) Macro Search Path'” for more information. - -Then, run ‘./configure’ as usual. - -Finally, you have to invoke ‘make check’ to run tests. If anything fails, -take a look at “info '(guix) Installation'” or send a message to -<guix-devel@gnu.org>. - -* Running Guix before it is installed - -See the same-named section in the manual. - -* The Perfect Setup - -The Perfect Setup to hack on Guix is basically the perfect setup used -for Guile hacking (info "(guile) Using Guile in Emacs"). First, you -need more than an editor, you need [[http://www.gnu.org/software/emacs][Emacs]], empowered by the wonderful -[[http://nongnu.org/geiser/][Geiser]]. - -Geiser allows for interactive and incremental development from within -Emacs: code compilation and evaluation from within buffers, access to -on-line documentation (docstrings), context-sensitive completion, M-. to -jump to an object definition, a REPL to try out your code, and more. - -To actually edit the code, Emacs already has a neat Scheme mode. But in -addition to that, you must not miss [[http://www.emacswiki.org/emacs/ParEdit][Paredit]]. It provides facilities to -directly operate on the syntax tree, such as raising an s-expression or -wrapping it, swallowing or rejecting the following s-expression, etc. - -* Submitting Patches - -Development is done using the Git distributed version control system. Thus, -access to the repository is not strictly necessary. We welcome contributions -in the form of patches as produced by ‘git format-patch’ sent to -guix-devel@gnu.org. Please write commit logs in the [[http://www.gnu.org/prep/standards/html_node/Change-Logs.html#Change-Logs][GNU ChangeLog -format]]; you can check the commit history for examples. - -Before submitting a patch that adds or modifies a package definition, please -run ‘guix lint PACKAGE’, where PACKAGE is the name of the new or modified -package, and fix any errors it reports. In addition, please make sure the -package builds on your platform, using ‘guix build’. You may also want to -check that dependent package (if applicable) are not affected by the change; -‘guix refresh --list-dependent PACKAGE’ will help you do that. - -When posting a patch to the mailing list, use "[PATCH] ..." as a subject. You -may use your email client or the ‘git send-mail’ command. - -As you become a regular contributor, you may find it convenient to have write -access to the repository (see below.) - -* Coding Style - -In general our code follows the [[info:standards][GNU Coding Standards]] (GCS). However, the GCS -do not say much about Scheme, so here are some additional rules. - -** Programming Paradigm - -Scheme code in Guix is written in a purely functional style. One exception is -code that involves input/output, and procedures that implement low-level -concepts, such as the ‘memoize’ procedure. - -** Modules - -Guile modules that are meant to be used on the builder side must live in the -(guix build …) name space. They must not refer to other Guix or GNU modules. -However, it is OK for a “host-side” module to use a build-side module. - -Modules that deal with the broader GNU system should be in the (gnu …) name -space rather than (guix …). - -** Data Types and Pattern Matching - -The tendency in classical Lisp is to use lists to represent everything, and -then to browse them “by hand” using ‘car’, ‘cdr’, ‘cadr’, and co. There are -several problems with that style, notably the fact that it is hard to read, -error-prone, and a hindrance to proper type error reports. - -Guix code should define appropriate data types (for instance, using -‘define-record-type*’) rather than abuse lists. In addition, it should use -pattern matching, via Guile’s (ice-9 match) module, especially when matching -lists. - -** Formatting Code - -When writing Scheme code, we follow common wisdom among Scheme programmers. -In general, we follow the [[http://mumble.net/~campbell/scheme/style.txt][Riastradh's Lisp Style Rules]]. This document happens -to describe the conventions mostly used in Guile’s code too. It is very -thoughtful and well written, so please do read it. - -Some special forms introduced in Guix, such as the ‘substitute*’ macro, have -special indentation rules. These are defined in the .dir-locals.el file, -which Emacs automatically uses. If you do not use Emacs, please make sure to -let your editor know the rules. - -We require all top-level procedures to carry a docstring. This requirement -can be relaxed for simple private procedures in the (guix build …) name space, -though. - -Procedures should not have more than four positional parameters. Use keyword -parameters for procedures that take more than four parameters. +or by checking the [[http://www.gnu.org/software/guix/manual/guix.html#Contributing][web copy of the manual]]. * Commit Access |