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Note: latest version of this file is at:
https://gitlab.freedesktop.org/xdg/shared-mime-info/-/blob/master/HACKING.md
A few ground rules for people interested in adding new mime-types.
* Mime-types used should be IANA registered mime-types when possible
* When old mime-types become registered, the new definition should
include an alias for the old mime-type
* New entries or modifications should include a test case (see below)
* Mime-types/file formats proprietary to one application should only
be added to a private .xml file and be bundled with the application
itself
* Magic offset must be as small as possible. For example, the worst case
scenario for ISO images is 32k inside the file. This is too big for a sniff
buffer, especially on remote locations. Avoid those.
* No commits should be done that break the test suite, or the test suite
test in question should be amended, and reason for the changes clearly
documented in the commit message
Translations
------------
Translations should go through Transifex.com, and the freedesktop.org team:
http://www.transifex.com/projects/p/shared-mime-info/
Filing bugs
-----------
Bugs can be filed at:
https://gitlab.freedesktop.org/xdg/shared-mime-info/issues
Merge requests are required for new mime-types and should include one or
more test files to be added to the test suite.
Test suite
----------
The shared-mime-info tests depend on xdgmime [1]. This is taken care of as a
git submodule and as a meson subproject. Run `meson subprojects update` or
`git submodule update --init` after cloning the shared-mime-info repo. If you
wish to keep the submodule automatically up to date on pull,
`git config submodule.recurse true` in the shared-mime-info dir helps with that.
xdgmime will be built automatically by the meson build system for
shared-mime-info.
Meson’s subprojects system[2] requires the xdgmime directory to be in
`subprojects/xdgmime`. An alternate path to xdgmime can be configured by
installing a pkg-config file for xdgmime which points to the desired location.
As part of the tests, `./xdgmime/src/test-mime-data` is run against
`tests/mime-detection/list`. The format of the file is:
`<testcase filename> <expected mime-type> <expected failures>`
The expected failures is whether matching the file with the mime-type would
fail when matched by file, data or name. "x" indicates expected failure, "o"
indicates expected success. Trailing "o"s can be omitted.
See the top of the `tests/mime-detection/list` file for syntax details.
You can also temporarily print the results of `test-mime-data` by putting your
test files in the `staging-tests/` sub-directory.
[1]: Repository details at:
https://gitlab.freedesktop.org/xdg/xdgmime
[2]: https://mesonbuild.com/Subprojects.html
Releasing
---------
- Run `ninja shared-mime-info-pot`, `./po/check_translations.sh` and
`./po/update_translations.sh` before release
- Commit and push to shared-mime-info gitlab
- Update version number in `meson.build`
- Add changelog to `NEWS`
git log --pretty=format:'* %s' <prevtag>..
- Commit, make a merge request, wait for CI to ensure `meson dist` works, then merge it.
- Tag and push the tag
- Go to https://gitlab.freedesktop.org/xdg/shared-mime-info/-/releases and click "New release"
- Fill in version number (3 times), paste NEWS, confirm
Updating the spec on the website
--------------------------------
- update https://gitlab.freedesktop.org/xdg/xdg-specs/blob/master/web-export/specs.idx
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