Add haptic feedback feature

Author: unsecretised

Cargo.lock

@@ -16,7 +16,9 @@ objc2-application-services = { version = "0.3.2", default-features = false, feat
     "HIServices",
     "Processes",
 ] }
+objc2-core-foundation = "0.3.2"
 objc2-foundation = { version = "0.3.2", features = ["NSString"] }
+once_cell = "1.21.3"
 rand = "0.9.2"
 rayon = "1.11.0"
 serde = { version = "1.0.228", features = ["derive"] }

Cargo.toml

@@ -0,0 +1,5 @@
+fn main() {
+    println!("cargo:rustc-link-search=framework=/System/Library/PrivateFrameworks");
+    println!("cargo:rustc-link-lib=framework=IOKit");
+    println!("cargo:rustc-link-lib=framework=MultitouchSupport");
+}

build.rs

@@ -20,6 +20,8 @@ use crate::app::tile::elm::default_app_paths;
 use crate::calculator::Expression;
 use crate::commands::Function;
 use crate::config::Config;
+use crate::haptics::HapticPattern;
+use crate::haptics::perform_haptic;
 use crate::utils::get_installed_apps;
 use crate::{
     app::{Message, Page, tile::Tile},
@@ -36,6 +38,11 @@ pub fn handle_update(tile: &mut Tile, message: Message) -> Task<Message> {
         }
 
         Message::SearchQueryChanged(input, id) => {
+            #[cfg(target_os = "macos")]
+            if tile.config.haptic_feedback {
+                perform_haptic(HapticPattern::Alignment);
+            }
+
             tile.query_lc = input.trim().to_lowercase();
             tile.query = input;
             let prev_size = tile.results.len();

src/app/tile/update.rs

@@ -22,6 +22,7 @@ pub struct Config {
     pub theme: Theme,
     pub placeholder: String,
     pub search_url: String,
+    pub haptic_feedback: bool,
     pub shells: Vec<Shelly>,
 }
 
@@ -35,6 +36,7 @@ impl Default for Config {
             theme: Theme::default(),
             placeholder: String::from("Time to be productive!"),
             search_url: "https://google.com/search?q=%s".to_string(),
+            haptic_feedback: false,
             shells: vec![],
         }
     }

src/config.rs

@@ -0,0 +1,162 @@
+#![allow(non_camel_case_types)]
+
+use objc2_core_foundation::{CFNumber, CFNumberType, CFRetained, CFString, CFType};
+use once_cell::sync::OnceCell;
+use std::ffi::{CStr, c_char, c_void};
+
+#[allow(dead_code)]
+#[derive(Copy, Clone, Debug)]
+pub enum HapticPattern {
+    Generic,
+    Alignment,
+    LevelChange,
+}
+
+unsafe extern "C" {
+    unsafe fn CFRelease(cf: *mut CFType);
+}
+
+#[inline]
+fn pattern_index(pattern: HapticPattern) -> i32 {
+    match pattern {
+        HapticPattern::Generic => 0,
+        HapticPattern::Alignment => 1,
+        HapticPattern::LevelChange => 2,
+    }
+}
+
+type kern_return_t = i32;
+type io_object_t = u32;
+type io_iterator_t = u32;
+type io_registry_entry_t = u32;
+type mach_port_t = u32;
+
+unsafe extern "C" {
+    fn IOServiceMatching(name: *const c_char) -> *mut CFType;
+    fn IOServiceGetMatchingServices(
+        master: mach_port_t,
+        matching: *mut CFType,
+        iter: *mut io_iterator_t,
+    ) -> kern_return_t;
+    fn IOIteratorNext(iter: io_iterator_t) -> io_object_t;
+    fn IOObjectRelease(obj: io_object_t) -> kern_return_t;
+    fn IORegistryEntryCreateCFProperty(
+        entry: io_registry_entry_t,
+        key: *mut CFString,
+        allocator: *const c_void,
+        options: u32,
+    ) -> *mut CFType;
+
+    fn MTActuatorCreateFromDeviceID(device_id: u64) -> *mut CFType;
+    fn MTActuatorOpen(actuator: *mut CFType) -> i32; // IOReturn
+    fn MTActuatorIsOpen(actuator: *mut CFType) -> bool;
+    fn MTActuatorActuate(actuator: *mut CFType, pattern: i32, unk: i32, f1: f32, f2: f32) -> i32;
+
+    fn CFGetTypeID(cf: *mut CFType) -> usize;
+    fn CFNumberGetTypeID() -> usize;
+    fn CFNumberGetValue(number: *mut CFNumber, theType: i32, valuePtr: *mut u64) -> bool;
+}
+
+#[inline]
+fn k_iomain_port_default() -> mach_port_t {
+    0
+}
+
+struct MtsState {
+    actuators: Vec<*mut CFType>,
+}
+
+unsafe impl Send for MtsState {}
+unsafe impl Sync for MtsState {}
+
+impl MtsState {
+    fn open_default_or_all() -> Option<Self> {
+        let mut iter: io_iterator_t = 0;
+        unsafe {
+            let name = CStr::from_bytes_with_nul_unchecked(b"AppleMultitouchDevice\0");
+            let matching = IOServiceMatching(name.as_ptr());
+            if matching.is_null() {
+                return None;
+            }
+            if IOServiceGetMatchingServices(k_iomain_port_default(), matching, &mut iter) != 0 {
+                return None;
+            }
+        }
+
+        let key = CFString::from_str("Multitouch ID");
+        let mut actuators: Vec<*mut CFType> = Vec::new();
+
+        unsafe {
+            loop {
+                let dev = IOIteratorNext(iter);
+                if dev == 0 {
+                    break;
+                }
+
+                let id_ref = IORegistryEntryCreateCFProperty(
+                    dev,
+                    CFRetained::<CFString>::as_ptr(&key).as_ptr(),
+                    std::ptr::null(),
+                    0,
+                );
+
+                if !id_ref.is_null() && CFGetTypeID(id_ref) == CFNumberGetTypeID() {
+                    let mut device_id: u64 = 0;
+                    if CFNumberGetValue(
+                        id_ref as *mut CFNumber,
+                        CFNumberType::SInt64Type.0 as i32,
+                        &mut device_id as *mut u64,
+                    ) {
+                        let act = MTActuatorCreateFromDeviceID(device_id);
+                        if !act.is_null() {
+                            if MTActuatorOpen(act) == 0 {
+                                actuators.push(act);
+                            } else {
+                                CFRelease(act);
+                            }
+                        }
+                    }
+                }
+
+                if !id_ref.is_null() {
+                    CFRelease(id_ref);
+                }
+                IOObjectRelease(dev);
+            }
+
+            if iter != 0 {
+                IOObjectRelease(iter);
+            }
+        }
+
+        if actuators.is_empty() {
+            None
+        } else {
+            Some(Self { actuators })
+        }
+    }
+}
+
+static MTS: OnceCell<Option<MtsState>> = OnceCell::new();
+
+fn mts_state() -> Option<&'static MtsState> {
+    MTS.get_or_init(|| MtsState::open_default_or_all()).as_ref()
+}
+
+pub fn perform_haptic(pattern: HapticPattern) -> bool {
+    if let Some(state) = mts_state() {
+        let pat = pattern_index(pattern);
+        let mut any_ok = false;
+        unsafe {
+            for &act in &state.actuators {
+                if !act.is_null() && MTActuatorIsOpen(act) {
+                    let kr = MTActuatorActuate(act, pat, 0, 0.0, 0.0);
+                    any_ok |= kr == 0;
+                }
+            }
+        }
+        any_ok
+    } else {
+        false
+    }
+}

src/haptics.rs

@@ -3,6 +3,7 @@ mod calculator;
 mod clipboard;
 mod commands;
 mod config;
+mod haptics;
 mod macos;
 mod utils;