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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 17:32:43 +0000
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+Presets
+=======
+
+Some selectors, such as ``fuzzy`` and ``syntax``, allow saving and loading presets from a file. This is a
+good way to re-use a selection, either at a later date or by sharing with others. Look for a
+'preset' section in ``mach <selector> --help`` to determine whether the selector supports this
+functionality.
+
+Using Presets
+-------------
+
+To save a preset, run:
+
+.. code-block:: shell
+
+ $ mach try <selector> --save <name> <args>
+
+For example, to save a preset that selects all Windows mochitests:
+
+.. code-block:: shell
+
+ $ mach try fuzzy --save all-windows-mochitests --query "'win 'mochitest"
+ preset saved, run with: --preset=all-windows-mochitests
+
+Then run that saved preset like this:
+
+.. code-block:: shell
+
+ $ mach try --preset all-windows-mochitests
+
+To see a list of all available presets run:
+
+.. code-block:: shell
+
+ $ mach try --list-presets
+
+
+Editing and Sharing Presets
+---------------------------
+
+Presets can be defined in one of two places, in your home directory or in a file checked into
+mozilla-central.
+
+Local Presets
+~~~~~~~~~~~~~
+
+These are defined in your ``$MOZBUILD_STATE_DIR``, typically ``~/.mozbuild/try_presets.yml``.
+Presets defined here are your own personal collection of presets. You can modify them by running:
+
+.. code-block:: shell
+
+ $ ./mach try --edit-presets
+
+
+Shared Presets
+~~~~~~~~~~~~~~
+
+You can also check presets into mozilla-central in `tools/tryselect/try_presets.yml`_. These presets
+will be available to all users of ``mach try``, so please be mindful when editing this file. Make
+sure the name of the preset is scoped appropriately (i.e doesn't contain any team or module specific
+terminology). It is good practice to prefix the preset name with the name of the team or module that
+will get the most use out of it.
+
+
+Preset Format
+~~~~~~~~~~~~~
+
+Presets are simple key/value objects, with the name as the key and a metadata object as the value.
+For example, the preset saved above would look something like this in ``try_presets.yml``:
+
+.. code-block:: yaml
+
+ all-windows-mochitests:
+ selector: fuzzy
+ description: >-
+ Runs all windows mochitests.
+ query:
+ - "'win 'mochitest"
+
+The ``selector`` key (required) allows ``mach try`` to determine which subcommand to dispatch to.
+The ``description`` key (optional in user presets but required for shared presets) is a human
+readable string describing what the preset selects and when to use it. All other values in the
+preset are forwarded to the specified selector as is.
+
+.. _tools/tryselect/try_presets.yml: https://searchfox.org/mozilla-central/source/tools/tryselect/try_presets.yml