feat(info): add fallback title detection on macOS

espanso-info/src/cocoa/ffi.rs

@@ -22,6 +22,7 @@ use std::os::raw::c_char;
 #[link(name = "espansoinfo", kind = "static")]
 extern "C" {
   pub fn info_get_title(buffer: *mut c_char, buffer_size: i32) -> i32;
+  pub fn info_get_title_fallback(buffer: *mut c_char, buffer_size: i32) -> i32;
   pub fn info_get_exec(buffer: *mut c_char, buffer_size: i32) -> i32;
   pub fn info_get_class(buffer: *mut c_char, buffer_size: i32) -> i32;
 }

espanso-info/src/cocoa/mod.rs

@@ -21,7 +21,7 @@ use std::{ffi::CStr, os::raw::c_char};
 
 use crate::{AppInfo, AppInfoProvider};
 
-use self::ffi::{info_get_class, info_get_exec, info_get_title};
+use self::ffi::{info_get_class, info_get_exec, info_get_title, info_get_title_fallback};
 
 mod ffi;
 
@@ -36,7 +36,7 @@ impl CocoaAppInfoProvider {
 impl AppInfoProvider for CocoaAppInfoProvider {
   fn get_info(&self) -> AppInfo {
     AppInfo {
-      title: self.get_title(),
+      title: self.get_title().or_else(|| self.get_title_fallback()),
       class: self.get_class(),
       exec: self.get_exec(),
     }
@@ -88,4 +88,20 @@ impl CocoaAppInfoProvider {
       None
     }
   }
+
+  // Fallback using Accessibility API instead of Carbon
+  fn get_title_fallback(&self) -> Option<String> {
+    let mut buffer: [c_char; 2048] = [0; 2048];
+    if unsafe { info_get_title_fallback(buffer.as_mut_ptr(), (buffer.len() - 1) as i32) } > 0 {
+      let string = unsafe { CStr::from_ptr(buffer.as_ptr()) };
+      let string = string.to_string_lossy();
+      if !string.is_empty() {
+        Some(string.to_string())
+      } else {
+        None
+      }
+    } else {
+      None
+    }
+  }
 }

espanso-info/src/cocoa/native.h

@@ -23,6 +23,7 @@
 #include <stdint.h>
 
 extern "C" int32_t info_get_title(char * buffer, int32_t buffer_size);
+extern "C" int32_t info_get_title_fallback(char * buffer, int32_t buffer_size);
 extern "C" int32_t info_get_exec(char * buffer, int32_t buffer_size);
 extern "C" int32_t info_get_class(char * buffer, int32_t buffer_size);
 

espanso-info/src/cocoa/native.mm

@@ -51,6 +51,51 @@ int32_t info_get_title(char *buffer, int32_t buffer_size)
   return 0;
 }
 
+// Partially taken from: https://stackoverflow.com/questions/480866/get-the-title-of-the-current-active-window-document-in-mac-os-x/23451568#23451568
+int32_t info_get_title_fallback(char *buffer, int32_t buffer_size)
+{
+  @autoreleasepool {
+    // Get the process ID of the frontmost application.
+    NSRunningApplication* app = [[NSWorkspace sharedWorkspace] frontmostApplication];
+    pid_t pid = [app processIdentifier];
+
+    AXUIElementRef appElem = AXUIElementCreateApplication(pid);
+    if (!appElem) {
+      return -1;
+    }
+
+    // Get the accessibility element corresponding to the frontmost window
+    // of the frontmost application.
+    AXUIElementRef window = NULL;
+    if (AXUIElementCopyAttributeValue(appElem, 
+          kAXFocusedWindowAttribute, (CFTypeRef*)&window) != kAXErrorSuccess) {
+      CFRelease(appElem);
+      return -2;
+    }
+
+    // Finally, get the title of the frontmost window.
+    CFStringRef title = NULL;
+    AXError result = AXUIElementCopyAttributeValue(window, kAXTitleAttribute,
+                      (CFTypeRef*)&title);
+
+    // At this point, we don't need window and appElem anymore.
+    CFRelease(window);
+    CFRelease(appElem);
+
+    if (result != kAXErrorSuccess) {
+      // Failed to get the window title.
+      return -3;
+    }
+
+    if (CFStringGetCString(title, buffer, buffer_size, kCFStringEncodingUTF8)) {
+      CFRelease(title);
+      return 1;
+    } else {
+      return -4;
+    }
+  }
+}
+
 int32_t info_get_exec(char *buffer, int32_t buffer_size)
 {
   @autoreleasepool {