Link/Append: Move most of core link/append code from WM to new `BKE_blendflie_link_append` module.

This will allow to expose all those advanced features of the WM
operators to other parts of the code, like the python library context
manager, copy/paste code, etc.

This is expected to be a strictly no-behavioral-change commit.

Part of T91414: Unify link/append between WM operators and BPY context
manager API, and cleanup usages of `BKE_library_make_local`.

Maniphest Tasks: T91414

Differential Revision: https://developer.blender.org/D13222

source/blender/blenkernel/BKE_blendfile_link_append.h

@@ -0,0 +1,91 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+#pragma once
+
+/** \file
+ * \ingroup bke
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct ID;
+struct Library;
+struct Main;
+struct ReportList;
+struct Scene;
+struct ViewLayer;
+struct View3D;
+
+typedef struct BlendfileLinkAppendContext BlendfileLinkAppendContext;
+typedef struct BlendfileLinkAppendContextItem BlendfileLinkAppendContextItem;
+
+BlendfileLinkAppendContext *BKE_blendfile_link_append_context_new(const int flag);
+void BKE_blendfile_link_append_context_free(struct BlendfileLinkAppendContext *lapp_context);
+void BKE_blendfile_link_append_context_flag_set(struct BlendfileLinkAppendContext *lapp_context,
+                                                const int flag,
+                                                const bool do_set);
+
+void BKE_blendfile_link_append_context_embedded_blendfile_set(
+    struct BlendfileLinkAppendContext *lapp_context,
+    const void *blendfile_mem,
+    int blendfile_memsize);
+void BKE_blendfile_link_append_context_embedded_blendfile_clear(
+    struct BlendfileLinkAppendContext *lapp_context);
+
+void BKE_blendfile_link_append_context_library_add(struct BlendfileLinkAppendContext *lapp_context,
+                                                   const char *libname);
+struct BlendfileLinkAppendContextItem *BKE_blendfile_link_append_context_item_add(
+    struct BlendfileLinkAppendContext *lapp_context,
+    const char *idname,
+    const short idcode,
+    void *userdata);
+void BKE_blendfile_link_append_context_item_library_index_enable(
+    struct BlendfileLinkAppendContext *lapp_context,
+    struct BlendfileLinkAppendContextItem *item,
+    const int library_index);
+bool BKE_blendfile_link_append_context_is_empty(struct BlendfileLinkAppendContext *lapp_context);
+
+void *BKE_blendfile_link_append_context_item_userdata_get(
+    struct BlendfileLinkAppendContext *lapp_context, struct BlendfileLinkAppendContextItem *item);
+struct ID *BKE_blendfile_link_append_context_item_newid_get(
+    struct BlendfileLinkAppendContext *lapp_context, struct BlendfileLinkAppendContextItem *item);
+
+void BKE_blendfile_append(struct BlendfileLinkAppendContext *lapp_context,
+                          struct ReportList *reports,
+                          struct Main *bmain,
+                          struct Scene *scene,
+                          struct ViewLayer *view_layer,
+                          const struct View3D *v3d);
+void BKE_blendfile_link(struct BlendfileLinkAppendContext *lapp_context,
+                        struct ReportList *reports,
+                        struct Main *bmain,
+                        struct Scene *scene,
+                        struct ViewLayer *view_layer,
+                        const struct View3D *v3d);
+
+void BKE_blendfile_library_relocate(struct BlendfileLinkAppendContext *lapp_context,
+                                    struct ReportList *reports,
+                                    struct Library *library,
+                                    const bool do_reload,
+                                    struct Main *bmain,
+                                    struct Scene *scene,
+                                    struct ViewLayer *view_layer);
+
+#ifdef __cplusplus
+}
+#endif

source/blender/blenkernel/CMakeLists.txt

@@ -100,6 +100,7 @@ set(SRC
   intern/blender_undo.c
   intern/blender_user_menu.c
   intern/blendfile.c
+  intern/blendfile_link_append.c
   intern/boids.c
   intern/bpath.c
   intern/brush.c
@@ -326,6 +327,7 @@ set(SRC
   BKE_blender_user_menu.h
   BKE_blender_version.h
   BKE_blendfile.h
+  BKE_blendfile_link_append.h
   BKE_boids.h
   BKE_bpath.h
   BKE_brush.h