config: Add keymap_from_names for RMLVO keymaps

jay-config/src/_private/client.rs

@@ -19,7 +19,7 @@ use {
             acceleration::AccelProfile, capability::Capability, clickmethod::ClickMethod,
         },
         keyboard::{
-            Keymap,
+            Group, Keymap,
             mods::{Modifiers, RELEASE},
             syms::KeySym,
         },
@@ -1385,6 +1385,23 @@ impl ConfigClient {
         keymap
     }
 
+    pub fn keymap_from_names(
+        &self,
+        rules: Option<&str>,
+        model: Option<&str>,
+        groups: Option<&[Group<'_>]>,
+        options: Option<&[&str]>,
+    ) -> Keymap {
+        let res = self.send_with_response(&ClientMessage::KeymapFromNames {
+            rules,
+            model,
+            groups: groups.map(|v| v.to_vec()),
+            options: options.map(|v| v.to_vec()),
+        });
+        get_response!(res, Keymap(0), KeymapFromNames { keymap });
+        keymap
+    }
+
     pub fn set_ei_socket_enabled(&self, enabled: bool) {
         self.send(&ClientMessage::SetEiSocketEnabled { enabled })
     }

jay-config/src/_private/ipc.rs

@@ -7,7 +7,7 @@ use {
             FocusFollowsMouseMode, InputDevice, LayerDirection, Seat, SwitchEvent, Timeline,
             acceleration::AccelProfile, capability::Capability, clickmethod::ClickMethod,
         },
-        keyboard::{Keymap, mods::Modifiers, syms::KeySym},
+        keyboard::{Group, Keymap, mods::Modifiers, syms::KeySym},
         logging::LogLevel,
         theme::{BarPosition, Color, colors::Colorable, sized::Resizable},
         timer::Timer,
@@ -820,6 +820,12 @@ pub enum ClientMessage<'a> {
         connector: Connector,
         use_native_gamut: bool,
     },
+    KeymapFromNames {
+        rules: Option<&'a str>,
+        model: Option<&'a str>,
+        groups: Option<Vec<Group<'a>>>,
+        options: Option<Vec<&'a str>>,
+    },
 }
 
 #[derive(Serialize, Deserialize, Debug)]
@@ -1067,6 +1073,9 @@ pub enum Response {
     GetBarPosition {
         position: BarPosition,
     },
+    KeymapFromNames {
+        keymap: Keymap,
+    },
 }
 
 #[derive(Serialize, Deserialize, Debug)]

jay-config/src/keyboard/mod.rs

@@ -70,6 +70,15 @@ impl Keymap {
     }
 }
 
+/// An RMLVO group consisting of a layout and a variant.
+#[derive(Serialize, Deserialize, Copy, Clone, Debug, Eq, PartialEq, Hash)]
+pub struct Group<'a> {
+    /// The layout of the group.
+    pub layout: &'a str,
+    /// The variant of the group. Can be an empty string.
+    pub variant: &'a str,
+}
+
 /// Parses a keymap.
 ///
 /// The returned keymap can later be used to set the keymap of a seat. If the keymap cannot
@@ -109,3 +118,39 @@ impl Keymap {
 pub fn parse_keymap(keymap: &str) -> Keymap {
     get!(Keymap::INVALID).parse_keymap(keymap)
 }
+
+/// Creates a keymap from RMLVO names.
+///
+/// If a parameter is not given, a value from the environment or a default is used:
+///
+/// | name                   | default                |
+/// | ---------------------- | ---------------------- |
+/// | `XKB_DEFAULT_RULES`    | `evdev`                |
+/// | `XKB_DEFAULT_MODEL`    | `pc105`                |
+/// | `XKB_DEFAULT_LAYOUT`   | `us`                   |
+/// | `XKB_DEFAULT_VARIANTS` |                        |
+/// | `XKB_DEFAULT_OPTIONS`  |                        |
+///
+/// `XKB_DEFAULT_LAYOUT` and `XKB_DEFAULT_VARIANTS` are parsed into the `groups` parameter like this example:
+/// ```
+/// XKB_DEFAULT_LAYOUT = "us,il,ru,de,jp"
+/// XKB_DEFAULT_VARIANTS = ",,phonetic,neo"
+/// ```
+/// produces:
+/// ```
+/// [
+///     Group { layout: "us", variant: "" },
+///     Group { layout: "il", variant: "" },
+///     Group { layout: "ru", variant: "phonetic" },
+///     Group { layout: "de", variant: "neo" },
+///     Group { layout: "jp", variant: "" },
+/// ]
+/// ```
+pub fn keymap_from_names(
+    rules: Option<&str>,
+    model: Option<&str>,
+    groups: Option<&[Group<'_>]>,
+    options: Option<&[&str]>,
+) -> Keymap {
+    get!(Keymap::INVALID).keymap_from_names(rules, model, groups, options)
+}

src/config/handler.rs

@@ -65,7 +65,7 @@ use {
                 CLICK_METHOD_BUTTON_AREAS, CLICK_METHOD_CLICKFINGER, CLICK_METHOD_NONE, ClickMethod,
             },
         },
-        keyboard::{Keymap, mods::Modifiers, syms::KeySym},
+        keyboard::{Group, Keymap, mods::Modifiers, syms::KeySym},
         logging::LogLevel,
         theme::{BarPosition, colors::Colorable, sized::Resizable},
         timer::Timer as JayTimer,
@@ -316,6 +316,39 @@ impl ConfigProxyHandler {
         res
     }
 
+    fn handle_keymap_from_names(
+        &self,
+        rules: Option<&str>,
+        model: Option<&str>,
+        groups: Option<Vec<Group<'_>>>,
+        options: Option<Vec<&str>>,
+    ) -> Result<(), CphError> {
+        let kbvm_groups = groups.map(|groups| {
+            groups
+                .iter()
+                .map(|g| kbvm::xkb::rmlvo::Group {
+                    layout: g.layout,
+                    variant: g.variant,
+                })
+                .collect::<Vec<_>>()
+        });
+        let (keymap, res) = match self.state.kb_ctx.keymap_from_names(
+            rules,
+            model,
+            kbvm_groups.as_deref(),
+            options.as_deref(),
+        ) {
+            Ok(keymap) => {
+                let id = Keymap(self.id());
+                self.keymaps.set(id, keymap);
+                (id, Ok(()))
+            }
+            Err(e) => (Keymap::INVALID, Err(CphError::ParseKeymapError(e))),
+        };
+        self.respond(Response::KeymapFromNames { keymap });
+        res
+    }
+
     fn handle_get_connectors(
         &self,
         dev: Option<DrmDevice>,
@@ -3332,6 +3365,14 @@ impl ConfigProxyHandler {
             } => self
                 .handle_connector_set_use_native_gamut(connector, use_native_gamut)
                 .wrn("connector_set_use_native_gamut")?,
+            ClientMessage::KeymapFromNames {
+                rules,
+                model,
+                groups,
+                options,
+            } => self
+                .handle_keymap_from_names(rules, model, groups, options)
+                .wrn("keymap_from_names")?,
         }
         Ok(())
     }

src/kbvm.rs

@@ -92,6 +92,25 @@ impl KbvmContext {
             .ctx
             .keymap_from_bytes(WriteToLog, None, keymap)
             .map_err(KbvmError::CouldNotParseKeymap)?;
+        let id = KbvmMapId(*blake3::hash(keymap).as_bytes());
+        self.create_keymap(id, map)
+    }
+
+    pub fn keymap_from_names(
+        &self,
+        rules: Option<&str>,
+        model: Option<&str>,
+        groups: Option<&[xkb::rmlvo::Group<'_>]>,
+        options: Option<&[&str]>,
+    ) -> Result<Rc<KbvmMap>, KbvmError> {
+        let map = self
+            .ctx
+            .keymap_from_names(WriteToLog, rules, model, groups, options);
+        let id = KbvmMapId(*blake3::hash(map.format().to_string().as_bytes()).as_bytes());
+        self.create_keymap(id, map)
+    }
+
+    fn create_keymap(&self, id: KbvmMapId, map: Keymap) -> Result<Rc<KbvmMap>, KbvmError> {
         let mut has_indicators = false;
         let mut num_lock = None;
         let mut caps_lock = None;
@@ -111,7 +130,7 @@ impl KbvmContext {
         }
         let builder = map.to_builder();
         Ok(Rc::new(KbvmMap {
-            id: KbvmMapId(*blake3::hash(keymap).as_bytes()),
+            id,
             state_machine: builder.build_state_machine(),
             map: create_keymap_memfd(&map, false).map_err(KbvmError::KeymapMemfd)?,
             xwayland_map: create_keymap_memfd(&map, true).map_err(KbvmError::KeymapMemfd)?,