143 lines
7.6 KiB
Markdown
143 lines
7.6 KiB
Markdown
---
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title: Rule Processing of HID++ Notifications
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layout: page
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---
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Rule processing is an experimental feature. Significant changes might be made in response to problems.
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Note that rule processing is only available when running under X11.
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Logitech devices that use HID++ version 2.0 or greater produce feature-based
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notifications that Solaar can process using a simple rule language. For
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example, using rules Solaar can emulate an `XF86_MonBrightnessDown` key tap
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in response to the pressing of the `Brightness Down` key on Craft keyboards,
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which normally does not produce any input at all when the keyboard is in
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Windows mode.
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Solaar's rules only activate on HID++ notifications so device actions that
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normally produce HID output need rule processing have to be first be set to
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this mode. Currently Solaar can set (divert) some mouse scroll wheels, some
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mouse thumb wheels, the crown of Craft keyboards, and some keys to produce
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HID++ notifications. Look for `HID++` or `Diversion` settings to see what
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diversion can be done with your devices. Runing Solaar with the `-dd`
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option will show information about notifications, including their feature
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name, report number, and data.
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In response to a feature-based HID++ notification Solaar runs a sequence of
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rules. A `Rule` is a sequence of components, which are either sub-rules,
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conditions, or actions. Conditions and actions are dictionaries with one
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entry whose key is the name of the condition or action and whose value is
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the argument of the action.
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If the last thing that a rule does is execute an action, no more rules are
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processed for the notification.
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Rules are evaluated by evaluating each of their components in order. The
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evaluation of a rule is terminated early if a condition component evaluates
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to false or the last evaluated sub-component of a component is an action. A
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rule is false if its last evaluated component evaluates to a false value.
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`Not` conditions take a single component and are true if their component
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evaluates to a false value.
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`Or` conditions take a sequence of components and are evaluated by
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evaluating each of their components in order.
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An Or condition is terminated early if a component evaluates to true or the
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last evaluated sub-component of a component is an action.
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A Or condition is true if its last evaluated component evaluates to a true
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value. `And` conditions take a sequence of components are evaluted the same
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as rules.
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`Process` conditions are true if the name of the active process starts with
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their string argument.
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`Feature` conditions are if true if the name of the feature of the current
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notification is their string argument.
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`Report` conditions are if true if the report number in the current
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notification is their integer argument.
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`Modifiers` conditions take either a string or a sequence of strings, which
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can only be `Shift`, `Control`, `Alt`, and `Super`.
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Modifiers conditions are true if their argument is the current keyboard
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modifiers.
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`Key` conditions are true if the Logitech name of the last diverted key or button down is their
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string argument. Logitech key and button names are shown in the `Key/Button Diversion`
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setting. Some keyboards have Gn keys, which are diverted using the 'Divert G Keys' setting.
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`Test` conditions are true if their test evaluates to true on the feature,
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report, and data of the current notification.
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Test conditions can return a number instead of a boolean.
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Test conditions consisting of a sequence of three or four integers use the first
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two to select bytes of the notification data.
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Writing this kind of test condition is not trivial.
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Three-element test conditions are true if the selected bytes bit-wise anded
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with its third element is non-zero.
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The value of these test conditions is the result of the and.
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Four-element test conditions are true if the selected bytes form a signed
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integer between the third and fourth elements.
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The value of these test condition is the signed value of the selected bytes
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if that is non-zero otherwise True.
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The other test conditions are mnemonic shorthands for meaningful feature,
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report, and data combinations.
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A `crown_right` test is the rotation amount of a `CROWN` right rotation.
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A `crown_left` test is the rotation amount of a `CROWN` left rotation.
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A `crown_right_ratchet` test is the ratchet amount of a `CROWN` right ratchet rotation.
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A `crown_left_ratchet` test is the ratchet amount of a `CROWN` left ratchet rotation.
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A `crown_tap` test is true for a `CROWN` tap.
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A `crown_start_press` test is true for the start of a `CROWN` press.
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A `crown_stop_press` test is true for the end of a `CROWN` press.
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A `crown_pressed` test is true for a `CROWN` notification with the Crown pressed.
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A `thumb_wheel_up` test is the rotation amount of a `THUMB WHEEL` upward rotation.
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A `thumb_wheel_down` test is the rotation amount of a `THUMB WHEEL` downward rotation.
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`lowres_wheel_up`, `lowres_wheel_down`, `hires_wheel_up`, `hires_wheel_down` are the
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same but for `LOWRES WHEEL` and `HIRES WHEEL`.
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A 'mouse-down' test is true for a mouse gesture mostly in the downward direction.
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`mouse-up', 'mouse-left', and 'mouse-right' are the same but for gestures in the other directions.
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`True` and `False` tests return True and False, respectively.
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A `KeyPress` action takes a sequence of X11 key symbols and simulates a chorded keypress on the keyboard.
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Any key symbols that correspond to modifier keys that are in the current keyboard modifiers are ignored.
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A `MouseScroll` action takes a sequence of two numbers and simulates a horizontal and vertical mouse scroll of these amounts.
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If the previous condition in the parent rule returns a number the scroll amounts are multiplied by this number.
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A `MouseClick` action takes a mouse button name (`left`, `middle` or `right`) and a positive number, and simulates that number of clicks of the specified button.
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An `Execute` actions takes a program and arguments and executes it asynchronously.
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Solaar has several built-in rules, which are run after user-created rules and so can be overridden by user-created rules.
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One rule turns
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`Brightness Down` key press notifications into `XF86_MonBrightnessDown` key taps
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and `Brightness Up` key press notifications into `XF86_MonBrightnessUp` key taps.
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Another rule makes Craft crown ratchet movements move between tabs when the crown is pressed
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and up and down otherwise.
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A third rule turns Craft crown ratchet movements into `XF86_AudioNext` or `XF86_AudioPrev` key taps when the crown is pressed and `XF86_AudioRaiseVolume` or `XF86_AudioLowerVolume` otherwise.
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A fourth rule doubles the speed of `THUMB WHEEL` movements unless the `Control` modifier is on.
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All of these rules are only active if the key or feature is diverted, of course.
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Solaar reads rules from a YAML configuration file (normally `~/.config/solaar/rules.yaml`).
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This file contains zero or more documents, each a rule.
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Here is a file with three rules:
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```
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%YAML 1.3
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---
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- Feature: CROWN
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- Process: quodlibet
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- Rule: [ Test: crown_start_press, KeyPress: XF86_AudioMute ]
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- Rule: [ Test: crown_pressed, Test: crown_right_ratchet, KeyPress: XF86_AudioNext ]
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- Rule: [ Test: crown_pressed, Test: crown_left_ratchet, KeyPress: XF86_AudioPrev ]
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- Rule: [ Test: crown_right_ratchet, KeyPress: XF86_AudioRaiseVolume ]
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- Rule: [ Test: crown_left_ratchet, KeyPress: XF86_AudioLowerVolume ]
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...
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---
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- Feature: THUMB WHEEL
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- Rule: [ Modifiers: Control, Test: thumb_wheel_up, MouseScroll: [-2, 0] ]
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- Rule:
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- Modifiers: Control
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- Test: thumb_wheel_down
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- MouseScroll: [-2, 0]
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- Rule: [ Or: [ Test: thumb_wheel_up, Test: thumb_wheel_down ], MouseScroll: [-1, 0] ]
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...
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---
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- Feature: LOWRES WHEEL
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- Rule: [ Or: [ Test: lowres_wheel_up, Test: lowres_wheel_down ], MouseScroll: [0, 2] ]
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...
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```
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