[libgweather/ebassi/gtk4] docs: Update the contribution guide

[Emmanuele Bassi <ebassi src gnome org>]

commit 655b644daee6e350afddaaab917ddd9d62061abe
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Mon Oct 11 14:41:53 2021 +0100

    docs: Update the contribution guide
    
    Remove dead/outdated links, and make it more newcomer friendly, by
    clearly stating the expectations on both the contributor and maintainer
    side.

 HACKING.md | 242 ++++++++++++++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 217 insertions(+), 25 deletions(-)
---
diff --git a/HACKING.md b/HACKING.md
index f7d436c9..fa7768de 100644
--- a/HACKING.md
+++ b/HACKING.md
@@ -1,40 +1,232 @@
-Hacking on libgweather
-======================
+Contributing to libgweather
+===========================
 
- + The development occurs in git:
+Thank you for considering contributing to libgweather!
 
-     https://gitlab.gnome.org/GNOME/libgweather
+These guidelines are meant for new contributors, regardless of their level
+of proficiency; following them allows the maintainers of libgweather to more
+effectively evaluate your contribution, and provide prompt feedback to you.
+Additionally, by following these guidelines you clearly communicate that you
+respect the time and effort that the people developing libgweather put into
+managing the project.
 
-   For information on how to access GNOME git please read:
+This project is free software, and it would not exist without contributions
+from the free and open source software community. There are many things that
+we value:
 
-     https://live.gnome.org/Git
+ - bug reporting and fixing
+ - documentation and examples
+ - tests
+ - testing and support for other platforms
+ - new features
 
- + Please send patches as merge requests in GNOME GitLab:
+Please, do **not** use the issue tracker for support questions. If you have
+questions on how to use libgweather effectively, you can use:
 
-     https://gitlab.gnome.org/GNOME/libgweather/-/issues
+ - the [`gweather` tag on GNOME's Discourse](https://discourse.gnome.org/tags/gweather)
 
-   Your patch should be in unified diff form (the -u option to GNU
-   diff). See also:
+The issue tracker is meant to be used for actionable issues only.
 
-     https://live.gnome.org/GnomeLove/SubmittingPatches
+## How to report bugs
 
- + Please try and send a patch against a recent version of this package.
-   Patches against git master are most preferable.
+### Security issues
 
- + Don't commit any but the most trivial patches without approval.
+You should not open a new issue for security related questions.
 
- + Exceptions to this are:
+Always use the [security report form](https://security.gnome.org) to ensure
+the relevant people are notified of your issue.
 
-   - Translators may commit basic i18n related patches to the build
-     setup.
-   - Build sheriff are welcome - in accordance with the relevant build
-     sheriff constraints.
+### Bug reports
 
+If you’re reporting a bug make sure to list:
 
-Adding new weather sources
-==========================
+ 0. which version of libgweather are you using?
+ 0. which operating system are you using?
+ 0. the necessary steps to reproduce the issue
+ 0. the expected outcome
+ 0. a description of the behavior
+ 0. a small, self-contained example exhibiting the behavior
+
+If the issue includes a crash, you should also include:
+
+ 0. the eventual warnings printed on the terminal
+ 0. a backtrace, obtained with tools such as GDB or LLDB
+
+If the issue includes a memory leak, you should also include:
+
+ 0. a log of definite leaks from a tool such as [valgrind’s 
memcheck](http://valgrind.org/docs/manual/mc-manual.html)
+
+For small issues, such as:
+
+ - spelling/grammar fixes in the documentation,
+ - typo correction,
+ - comment clean ups,
+ - changes to metadata files (CI, `.gitignore`),
+ - build system changes, or
+ - source tree clean ups and reorganizations;
+
+or for self-contained bug fixes where you have implemented and tested a solution
+already, you should directly open a merge request instead of filing a new issue.
+
+### Features and enhancements
+
+Feature discussion can be open ended and require high bandwidth channels; if
+you are proposing a new feature on the issue tracker, make sure to make
+an actionable proposal, and list:
+
+ 0. what you’re trying to achieve and the problem it solves
+ 0. three (or more) existing pieces of software which would benefit from the
+    new feature
+
+New APIs, in particular, should follow the ‘rule of three’, where there should
+be three (or more) pieces of software which are ready to use the new APIs. This
+allows us to check that the new APIs are usable in real-life code, and fit well
+with related APIs.
+
+If proposing a large feature or change, it’s better to discuss it on
+[Discourse](https://discourse.gnome.org) before putting time into writing an
+actionable issue — and certainly before putting time into writing a merge
+request.
+
+## Your first contribution
+
+### Prerequisites
+
+If you want to contribute to the libgweather project, you will need to have
+the development tools appropriate for your operating system, including:
+
+ - Python 3.x
+ - Meson
+ - Ninja
+ - Gettext (19.7 or newer)
+ - a [C99 compatible compiler](https://wiki.gnome.org/Projects/GLib/CompilerRequirements)
+
+Up-to-date instructions about developing GNOME applications and libraries
+can be found on [the GNOME Developer Center](https://developer.gnome.org).
+
+The [libgweather project uses GitLab](https://gitlab.gnome.org/GNOME/libgweather/)
+for code hosting and for tracking issues. More information about using GitLab
+can be found [on the GNOME wiki](https://wiki.gnome.org/GitLab).
+
+### Getting started
+
+You should start by forking the libgweather repository from the GitLab web
+UI, and cloning from your fork:
+
+```sh
+$ git clone https://gitlab.gnome.org/yourusername/libgweather.git
+$ cd libgweather
+```
+
+To compile the Git version of libgweather on your system, you will need to
+configure your build using Meson:
+
+```sh
+$ meson setup _builddir .
+$ meson compile -C _builddir
+```
+
+Typically, you should work on your own branch:
+
+```sh
+$ git switch -C your-branch
+```
+
+Once you’ve finished working on the bug fix or feature, push the branch
+to the Git repository and open a new merge request, to let the libgweather
+core developers review your contribution.
+
+### Code reviews
+
+Each contribution is reviewed by the core developers of the libgweather
+project.
+
+With each code review, we intend to:
+
+ 0. Identify if this is a desirable change or new feature. Ideally for larger
+    features this will have been discussed (in an issue, on IRC, or on
+    Discourse) already, so that effort isn’t wasted on putting together merge
+    requests which will be rejected.
+ 0. Check the design of any new API.
+ 0. Provide realistic estimates of how long a review might take, if it can’t
+    happen immediately.
+ 0. Ensure that all significant contributions of new code, or bug fixes, are
+    adequately tested, either through requiring tests to be submitted at the
+    same time, or as a follow-up.
+ 0. Ensure that all new APIs are documented and have
+    [introspection annotations](https://gi.readthedocs.org).
+ 0. Check that the contribution is split into logically separate commits, each
+    with a good commit message.
+ 0. Encourage further high quality contributions.
+ 0. Ensure code style and quality is upheld.
+
+If a code review is stalled (due to not receiving comments for two or more
+weeks; or due to a technical disagreement), please ping the libgweather
+maintainers on the merge request, or on IRC, to ask for a second opinion.
+
+### Commit messages
+
+The expected format for git commit messages is as follows:
+
+```plain
+Short explanation of the commit
+
+Longer explanation explaining exactly what’s changed, whether any
+external or private interfaces changed, what bugs were fixed (with bug
+tracker reference if applicable) and so forth. Be concise but not too
+brief.
+
+Closes #1234
+```
+
+ - Always add a brief description of the commit to the _first_ line of
+ the commit and terminate by two newlines (it will work without the
+ second newline, but that is not nice for the interfaces).
+
+ - First line (the brief description) must only be one sentence and
+ should start with a capital letter unless it starts with a lowercase
+ symbol or identifier. Don’t use a trailing period either. Don’t exceed
+ 72 characters.
+
+ - The main description (the body) is normal prose and should use normal
+ punctuation and capital letters where appropriate. Consider the commit
+ message as an email sent to the developers (or yourself, six months
+ down the line) detailing **why** you changed something. There’s no need
+ to specify the **how**: the changes can be inlined.
+
+ - When committing code on behalf of others use the `--author` option, e.g.
+ `git commit -a --author "Joe Coder <joe coder org>"` and `--signoff`.
+
+ - If your commit is addressing an issue, use the
+ [GitLab syntax](https://docs.gitlab.com/ce/user/project/issues/automatic_issue_closing.html)
+ to automatically close the issue when merging the commit with the upstream
+ repository:
+
+```plain
+Closes #1234
+Fixes #1234
+Closes: https://gitlab.gnome.org/GNOME/libgweather/issues/1234
+```
+
+ - If you have a merge request with multiple commits and none of them
+ completely fixes an issue, you should add a reference to the issue in
+ the commit message, e.g. `Bug: #1234`, and use the automatic issue
+ closing syntax in the description of the merge request.
+
+### Notes for developers in the GNOME group on GitLab
+
+Don't commit any but the most trivial patches without approval.
+
+Exceptions to the rule above:
+
+ - Translators may commit basic i18n related patches to the build setup.
+ - Release team members are welcome to commit merge requests to unbreak
+   the GNOME build.
+
+## Adding new weather sources
 
 To add new weather sources, a number of requirements must be considered:
+
 - the API should be documented
 - access to the API can require the use of a freely available application
   token ID. See the requirements below.
@@ -53,10 +245,10 @@ To add new weather sources, a number of requirements must be considered:
   must have a comment mentioning that fact in the GWeatherWeather API documentation
 - finally, a working and applicable patch must be provided
 
-Privacy
--------
+## Privacy
 
 The user’s privacy must be maintained as much as possible:
+
 - don’t include unnecessary detail in requests
 - don’t allow fine-grained location tracking
 - don’t include other identifying information in the requests if possible
@@ -64,11 +256,11 @@ The user’s privacy must be maintained as much as possible:
   equivalent services, eg. not use requests as a way to feed into user tracking
   for an advertisment business
 
-Application token usage
------------------------
+## Application token usage
 
 Not using tokens is preferable, but some data sources don't offer the option.
 There are a number of requirements for those tokens:
+
 - One should be provided in the patch for testing purposes, and be easily
   overridable by distributions wishing to have a separate identifier and limits
 - The test token should have high enough limits that you're reasonably confident