[niepce/lr-import: 14/20] rust: remove unused C bindings

[Hubert Figuière <hub src gnome org>]

commit a964ac4ca7f7dadfbfbe46edb399383c58a6ec7a
Author: Hubert Figuière <hub figuiere net>
Date:   Fri Dec 10 22:04:48 2021 -0500

    rust: remove unused C bindings
    
    - engine_db_keyword_delete()
    - engine_library_notification_delete()
    - metadatachange_*()

 crates/npc-engine/src/db/keyword.rs           |  7 -------
 crates/npc-engine/src/library/notification.rs | 25 -------------------------
 2 files changed, 32 deletions(-)
---
diff --git a/crates/npc-engine/src/db/keyword.rs b/crates/npc-engine/src/db/keyword.rs
index af84df0..f86156f 100644
--- a/crates/npc-engine/src/db/keyword.rs
+++ b/crates/npc-engine/src/db/keyword.rs
@@ -86,10 +86,3 @@ pub extern "C" fn engine_db_keyword_keyword(obj: &Keyword) -> *mut c_char {
     let cstr = CString::new(obj.keyword()).unwrap();
     cstr.into_raw()
 }
-
-/// # Safety
-/// Dereference raw pointer.
-#[no_mangle]
-pub unsafe extern "C" fn engine_db_keyword_delete(kw: *mut Keyword) {
-    Box::from_raw(kw);
-}
diff --git a/crates/npc-engine/src/library/notification.rs b/crates/npc-engine/src/library/notification.rs
index 2af98ae..c19dca7 100644
--- a/crates/npc-engine/src/library/notification.rs
+++ b/crates/npc-engine/src/library/notification.rs
@@ -20,7 +20,6 @@
 use super::queriedcontent::QueriedContent;
 use crate::db::libfile::FileStatus;
 use crate::db::{Album, Keyword, Label, LibFolder, LibMetadata, LibraryId, NiepceProperties};
-use npc_fwk::base::PropertyIndex;
 use npc_fwk::toolkit;
 use npc_fwk::toolkit::thumbnail;
 use npc_fwk::toolkit::PortableChannel;
@@ -104,21 +103,6 @@ pub struct Thumbnail {
     pub pix: thumbnail::Thumbnail,
 }
 
-#[no_mangle]
-pub extern "C" fn metadatachange_get_id(meta: &MetadataChange) -> LibraryId {
-    meta.id
-}
-
-#[no_mangle]
-pub extern "C" fn metadatachange_get_meta(meta: &MetadataChange) -> PropertyIndex {
-    meta.meta.into()
-}
-
-#[no_mangle]
-pub extern "C" fn metadatachange_get_value(meta: &MetadataChange) -> *const PropertyValue {
-    &meta.value
-}
-
 #[derive(Clone)]
 pub enum LibNotification {
     AddedFile,
@@ -166,15 +150,6 @@ pub extern "C" fn engine_library_notify_filestatus_changed(
     true
 }
 
-/// Delete the Notification object.
-///
-/// # Safety
-/// Use raw pointer.
-#[no_mangle]
-pub unsafe extern "C" fn engine_library_notification_delete(n: *mut LibNotification) {
-    Box::from_raw(n);
-}
-
 #[no_mangle]
 pub unsafe extern "C" fn engine_library_notification_type(
     n: *const LibNotification,