feat: add libnotify error

src/api/functions.rs

@@ -1,3 +1,5 @@
+use crate::api::errors::LibnotifyError;
+
 use super::utils::c_str_to_rs_str_and_free;
 
 use super::libnotify::*;
@@ -10,7 +12,7 @@ use super::libnotify::*;
 /// Initialized libnotify. This must be called before any other functions.
 ///
 /// Starting from 0.8, if the provided app_name is NULL, libnotify will try to figure it out from the running application. Before it was not allowed, and was causing libnotify not to be initialized.
-pub fn init<'a, T>(app_name: T) -> Result<(), Box<dyn std::error::Error>>
+pub fn init<'a, T>(app_name: T) -> Result<(), LibnotifyError>
 where
     T: Into<Option<&'a str>>,
 {
@@ -24,7 +26,7 @@ where
         )
     } == 0
     {
-        return Err("Libnotify init failed".into());
+        return Err(LibnotifyError::InitFail);
     }
 
     Ok(())
@@ -161,7 +163,7 @@ pub fn get_server_info() -> Option<ServerInfo> {
 */
 
 /// Sets the application name
-pub fn set_app_name(app_name: &str) -> Result<(), std::ffi::NulError> {
+pub fn set_app_name(app_name: &str) -> Result<(), LibnotifyError> {
     let app_name_c = std::ffi::CString::new(app_name)?;
     unsafe { notify_set_app_name(app_name_c.as_ptr()) };
 
@@ -172,7 +174,7 @@ pub fn set_app_name(app_name: &str) -> Result<(), std::ffi::NulError> {
 /// Available since: 0.8.4
 ///
 /// app_icon is icon name or path to an image
-pub fn set_app_icon(app_icon: &str) -> Result<(), std::ffi::NulError> {
+pub fn set_app_icon(app_icon: &str) -> Result<(), LibnotifyError> {
     let app_icon_c = std::ffi::CString::new(app_icon)?;
     unsafe { notify_set_app_icon(app_icon_c.as_ptr()) };
 
@@ -195,11 +197,10 @@ mod tests {
 
     #[test]
     fn test_bad_init() {
-        assert!(
-            init("Mor\0ius")
-                .unwrap_err()
-                .is::<std::ffi::c_str::NulError>()
-        );
+        assert!(matches!(
+            init("Mor\0ius").unwrap_err(),
+            LibnotifyError::NulError(_)
+        ));
     }
 
     #[test]