feat: add libnotify error

Cargo.lock

@@ -247,7 +247,7 @@ dependencies = [
 
 [[package]]
 name = "libnotify-rs"
-version = "0.2.0"
+version = "0.2.1"
 dependencies = [
  "bindgen",
  "glib",

src/api/errors.rs

@@ -0,0 +1,37 @@
+/// Enum mapping every possible error that can happen in this lib, with a nice enum.
+#[derive(Debug)]
+pub enum LibnotifyError {
+    /// [libnotify init](https://gnome.pages.gitlab.gnome.org/libnotify/func.init.html) failed
+    InitFail,
+    /// `&str` contains a null terminator. Read more at [std documentation](https://doc.rust-lang.org/std/ffi/struct.NulError.html)
+    NulError(std::ffi::NulError),
+}
+
+impl std::fmt::Display for LibnotifyError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Self::InitFail => {
+                write!(f, "Libnotify failed to init")
+            }
+
+            Self::NulError(_) => {
+                write!(f, "Argument contains a null terminator")
+            }
+        }
+    }
+}
+
+impl std::error::Error for LibnotifyError {
+    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
+        match self {
+            Self::InitFail => None,
+            Self::NulError(e) => Some(e),
+        }
+    }
+}
+
+impl From<std::ffi::NulError> for LibnotifyError {
+    fn from(value: std::ffi::NulError) -> Self {
+        Self::NulError(value)
+    }
+}

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]

src/api/mod.rs

@@ -1,3 +1,5 @@
+/// Custom error types
+pub mod errors;
 /// Same as [libnotify global functions](https://gnome.pages.gitlab.gnome.org/libnotify/index.html#functions)
 pub mod functions;
 mod libnotify;

src/wrappers/context.rs

@@ -1,4 +1,7 @@
-use crate::api::functions::{init, is_initted, set_app_icon, set_app_name, uninit};
+use crate::api::{
+    errors::LibnotifyError,
+    functions::{init, is_initted, set_app_icon, set_app_name, uninit},
+};
 
 /// Notification context. Handles libnotify initializing and uninitializing.
 pub struct LibnotifyContext {}
@@ -25,13 +28,13 @@ impl LibnotifyContext {
     }
 
     /// Sets global app name
-    pub fn set_new_name(&self, app_name: &str) -> Result<(), std::ffi::NulError> {
+    pub fn set_new_name(&self, app_name: &str) -> Result<(), LibnotifyError> {
         set_app_name(app_name)?;
         Ok(())
     }
 
     /// Sets global app icon
-    pub fn set_app_icon(&self, app_icon: &str) -> Result<(), std::ffi::NulError> {
+    pub fn set_app_icon(&self, app_icon: &str) -> Result<(), LibnotifyError> {
         set_app_icon(app_icon)?;
         Ok(())
     }