Add modifier keys to macos

native/libmacbridge/AppDelegate.mm

@@ -24,13 +24,24 @@ void * interceptor_instance;
     NSLog(@"registering keydown mask");
     [NSEvent addGlobalMonitorForEventsMatchingMask:(NSEventMaskKeyDown | NSEventMaskFlagsChanged)
             handler:^(NSEvent *event){
-        if (event.type == NSEventTypeKeyDown) {
+        if (event.type == NSEventTypeKeyDown
+            && event.keyCode != 0x33) { // Send backspace as a modifier
+
             const char * chars = [event.characters UTF8String];
             int len = event.characters.length;
-            keypress_callback(interceptor_instance, chars, len);
-            NSLog(@"keydown: %@, %d", event.characters, event.keyCode);
+
+            keypress_callback(interceptor_instance, chars, len, 0, event.keyCode);
+            //NSLog(@"keydown: %@, %d", event.characters, event.keyCode);
         }else{
-            NSLog(@"keydown: %d", event.keyCode);
+            // Because this event is triggered for both the press and release of a modifier, trigger the callback
+            // only on release
+            if (([event modifierFlags] & (NSEventModifierFlagShift | NSEventModifierFlagCommand |
+                NSEventModifierFlagControl | NSEventModifierFlagOption)) == 0) {
+
+                keypress_callback(interceptor_instance, NULL, 0, 1, event.keyCode);
+            }
+
+            //NSLog(@"keydown: %d", event.keyCode);
         }
     }];
 }

native/libmacbridge/bridge.h

@@ -19,7 +19,7 @@ int32_t eventloop();
  * Called when a new keypress is made, the first argument is an char array,
  * while the second is the size of the array.
  */
-typedef void (*KeypressCallback)(void * self, const char *buffer, int32_t len);
+typedef void (*KeypressCallback)(void * self, const char *buffer, int32_t len, int32_t is_modifier, int32_t key_code);
 
 extern KeypressCallback keypress_callback;
 extern void * interceptor_instance;

native/libmacbridge/bridge.mm

@@ -2,6 +2,7 @@
 
 #import <Foundation/Foundation.h>
 #include "AppDelegate.h"
+#include <string.h>
 extern "C" {
 
 }
@@ -25,33 +26,40 @@ int32_t eventloop() {
 }
 
 void send_string(const char * string) {
+    char * stringCopy = strdup(string);
+    dispatch_async(dispatch_get_main_queue(), ^(void) {
         // Convert the c string to a UniChar array as required by the CGEventKeyboardSetUnicodeString method
-    NSString * nsString = [NSString stringWithUTF8String:string];
-    CFStringRef cfString = (__bridge CFStringRef)nsString;
-    std::vector<UniChar> buffer(nsString.length);
+        NSString *nsString = [NSString stringWithUTF8String:stringCopy];
+        CFStringRef cfString = (__bridge CFStringRef) nsString;
+        std::vector <UniChar> buffer(nsString.length);
         CFStringGetCharacters(cfString, CFRangeMake(0, nsString.length), buffer.data());
 
+        free(stringCopy);
+
         // Send the event
         CGEventRef e = CGEventCreateKeyboardEvent(NULL, 0x31, true);
         CGEventKeyboardSetUnicodeString(e, buffer.size(), buffer.data());
         CGEventPost(kCGHIDEventTap, e);
         CFRelease(e);
+    });
 }
 
 void delete_string(int32_t count) {
-    for (int i = 0; i<count; i++) {
+    dispatch_async(dispatch_get_main_queue(), ^(void) {
+        for (int i = 0; i < count; i++) {
             CGEventRef keydown;
-        keydown = CGEventCreateKeyboardEvent (NULL, 0x33, true);
+            keydown = CGEventCreateKeyboardEvent(NULL, 0x33, true);
             CGEventPost(kCGHIDEventTap, keydown);
             CFRelease(keydown);
 
             usleep(2000);
 
             CGEventRef keyup;
-        keyup = CGEventCreateKeyboardEvent (NULL, 0x33, false);
+            keyup = CGEventCreateKeyboardEvent(NULL, 0x33, false);
             CGEventPost(kCGHIDEventTap, keyup);
             CFRelease(keyup);
 
             usleep(2000);
         }
+    });
 }

src/config.rs

@@ -12,9 +12,21 @@ const DEFAULT_CONFIG_FILE_CONTENT : &str = include_str!("res/config.yaml");
 
 #[derive(Debug, Serialize, Deserialize)]
 pub struct Configs {
+    #[serde(default)]
+    pub backspace_enabled: bool,
+
     pub matches: Vec<Match>
 }
 
+impl Default for Configs {
+    fn default() -> Self {
+        Configs {
+            backspace_enabled: false,
+            matches: Vec::new()
+        }
+    }
+}
+
 impl Configs {
     pub fn load(path: &Path) -> Configs {
         let file_res = File::open(path);

src/keyboard/linux.rs

@@ -2,10 +2,11 @@ use std::thread;
 use std::sync::mpsc;
 use std::os::raw::c_char;
 use std::ffi::CString;
+use crate::keyboard::KeyEvent;
 
 #[repr(C)]
 pub struct LinuxKeyboardInterceptor {
-    pub sender: mpsc::Sender<char>
+    pub sender: mpsc::Sender<KeyEvent>
 }
 
 impl super::KeyboardInterceptor for LinuxKeyboardInterceptor {

src/keyboard/macos.rs

@@ -1,10 +1,12 @@
 use std::sync::mpsc;
 use std::os::raw::c_char;
 use std::ffi::CString;
+use crate::keyboard::{KeyEvent, KeyModifier};
+use crate::keyboard::KeyModifier::*;
 
 #[repr(C)]
 pub struct MacKeyboardInterceptor {
-    pub sender: mpsc::Sender<char>
+    pub sender: mpsc::Sender<KeyEvent>
 }
 
 impl super::KeyboardInterceptor for MacKeyboardInterceptor {
@@ -39,16 +41,31 @@ impl super::KeyboardSender for MacKeyboardSender {
 
 // Native bridge code
 
-extern fn keypress_callback(_self: *mut MacKeyboardInterceptor, raw_buffer: *const u8, len: i32) {
+extern fn keypress_callback(_self: *mut MacKeyboardInterceptor, raw_buffer: *const u8, len: i32,
+                            is_modifier: i32, key_code: i32) {
     unsafe {
+        if is_modifier == 0 {  // Char event
             // Convert the received buffer to a character
             let buffer = std::slice::from_raw_parts(raw_buffer, len as usize);
             let r = String::from_utf8_lossy(buffer).chars().nth(0);
 
             // Send the char through the channel
             if let Some(c) = r {
-            //println!("'{}'",c);
-            (*_self).sender.send(c).unwrap();
+                (*_self).sender.send(KeyEvent::Char(c)).unwrap();
+            }
+        }else{  // Modifier event
+            let modifier: Option<KeyModifier> = match key_code {
+                0x37 => Some(META),
+                0x38 => Some(SHIFT),
+                0x3A => Some(ALT),
+                0x3B => Some(CTRL),
+                0x33 => Some(BACKSPACE),
+                _ => None,
+            };
+
+            if let Some(modifier) = modifier {
+                (*_self).sender.send(KeyEvent::Modifier(modifier)).unwrap();
+            }
         }
     }
 }
@@ -56,7 +73,9 @@ extern fn keypress_callback(_self: *mut MacKeyboardInterceptor, raw_buffer: *con
 #[allow(improper_ctypes)]
 #[link(name="macbridge", kind="static")]
 extern {
-    fn register_keypress_callback(s: *const MacKeyboardInterceptor, cb: extern fn(_self: *mut MacKeyboardInterceptor, *const u8, i32));
+    fn register_keypress_callback(s: *const MacKeyboardInterceptor,
+                                  cb: extern fn(_self: *mut MacKeyboardInterceptor, *const u8,
+                                                i32, i32, i32));
     fn initialize();
     fn eventloop();
     fn send_string(string: *const c_char);

src/keyboard/mod.rs

@@ -14,6 +14,21 @@ pub trait KeyboardInterceptor {
     fn start(&self);
 }
 
+#[derive(Debug)]
+pub enum KeyModifier {
+    CTRL,
+    SHIFT,
+    ALT,
+    META,
+    BACKSPACE,
+}
+
+#[derive(Debug)]
+pub enum KeyEvent {
+    Char(char),
+    Modifier(KeyModifier)
+}
+
 pub trait KeyboardSender {
     fn send_string(&self, s: &str);
     fn delete_string(&self, count: i32);
@@ -22,7 +37,7 @@ pub trait KeyboardSender {
 // WINDOWS IMPLEMENTATIONS
 
 #[cfg(target_os = "windows")]
-pub fn get_interceptor(sender: mpsc::Sender<char>) -> impl KeyboardInterceptor {
+pub fn get_interceptor(sender: mpsc::Sender<KeyEvent>) -> impl KeyboardInterceptor {
     windows::WindowsKeyboardInterceptor {sender}
 }
 
@@ -34,7 +49,7 @@ pub fn get_sender() -> impl KeyboardSender {
 // LINUX IMPLEMENTATIONS
 
 #[cfg(target_os = "linux")]
-pub fn get_interceptor(sender: mpsc::Sender<char>) -> impl KeyboardInterceptor {
+pub fn get_interceptor(sender: mpsc::Sender<KeyEvent>) -> impl KeyboardInterceptor {
     linux::LinuxKeyboardInterceptor {sender}
 }
 
@@ -45,7 +60,7 @@ pub fn get_sender() -> impl KeyboardSender {
 
 // MAC IMPLEMENTATION
 #[cfg(target_os = "macos")]
-pub fn get_interceptor(sender: mpsc::Sender<char>) -> impl KeyboardInterceptor {
+pub fn get_interceptor(sender: mpsc::Sender<KeyEvent>) -> impl KeyboardInterceptor {
     macos::MacKeyboardInterceptor {sender}
 }
 

src/keyboard/windows.rs

@@ -1,10 +1,11 @@
 use std::thread;
 use std::sync::mpsc;
 use widestring::{U16CString};
+use crate::keyboard::KeyEvent;
 
 #[repr(C)]
 pub struct WindowsKeyboardInterceptor {
-    pub sender: mpsc::Sender<char>
+    pub sender: mpsc::Sender<KeyEvent>
 }
 
 impl super::KeyboardInterceptor for WindowsKeyboardInterceptor {

src/matcher/mod.rs

@@ -1,5 +1,6 @@
 use std::sync::mpsc::Receiver;
 use serde::{Serialize, Deserialize};
+use crate::keyboard::{KeyEvent, KeyModifier};
 
 pub(crate) mod scrolling;
 
@@ -15,12 +16,20 @@ pub trait MatchReceiver {
 
 pub trait Matcher<'a>: Send {
     fn handle_char(&'a self, c: char);
-    fn watch(&'a self, receiver: Receiver<char>) {
+    fn handle_modifier(&'a self, m: KeyModifier);
+    fn watch(&'a self, receiver: Receiver<KeyEvent>) {
         loop {
             match receiver.recv() {
-                Ok(c) => {
+                Ok(event) => {
+                    match event {
+                        KeyEvent::Char(c) => {
                             self.handle_char(c);
                         },
+                        KeyEvent::Modifier(m) => {
+                            self.handle_modifier(m);
+                        },
+                    }
+                },
                 Err(_) => panic!("Keyboard interceptor broke receiver stream."),
             }
         }

src/matcher/scrolling.rs

@@ -1,5 +1,6 @@
 use crate::matcher::{Match, MatchReceiver};
 use std::cell::RefCell;
+use crate::keyboard::KeyModifier;
 
 pub struct ScrollingMatcher<'a, R> where R: MatchReceiver{
     matches: Vec<Match>,
@@ -44,6 +45,10 @@ impl <'a, R> super::Matcher<'a> for ScrollingMatcher<'a, R> where R: MatchReceiv
             self.receiver.on_match(_match);
         }
     }
+
+    fn handle_modifier(&'a self, m: KeyModifier) {
+
+    }
 }
 
 impl <'a, R> ScrollingMatcher<'a, R> where R: MatchReceiver {