add context manager snippets

snippets/dev/context_manager_bmesh.py

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+## context managers for Bmesh editing
+## Author: Salai Vedha Viradhan : from https://salaivv.com/2023/07/07/context-mangers-blender
+
+import bpy
+import bmesh
+from contextlib import contextmanager
+
+# Bmesh operations on a mesh object
+@contextmanager
+def BMeshObject(mesh_object):
+    # Setup process
+    mesh = bmesh.new()
+    mesh.from_mesh(mesh_object.data)
+
+    try:
+        # Yielding mesh to the outer context to execute
+        # the statements inside the 'with' block
+        yield mesh
+    finally:
+        # Teardown process
+        mesh.to_mesh(mesh_object.data)
+        mesh.free()
+
+## Usage:
+# with BMeshObject(mesh_object) as mesh:
+#     bmesh.ops.remove_doubles(mesh, verts=mesh.verts, dist=0.0001)

snippets/dev/context_manager_edit_mode.py

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+## context managers for edit mode
+## Author: Salai Vedha Viradhan : from https://salaivv.com/2023/07/07/context-mangers-blender
+
+import bpy
+import contextlib
+
+# Edit mode operations on passed object
+@contextlib.contextmanager
+def EditMode(active_object):
+    # Setup process
+    bpy.ops.object.mode_set(mode='OBJECT')
+    bpy.ops.object.select_all(action='DESELECT')
+    bpy.context.view_layer.objects.active = active_object
+    bpy.ops.object.mode_set(mode='EDIT')
+
+    try:
+        # Yielding execution to the outer context to execute
+        # the statements inside the 'with' block
+        yield
+    finally:
+        # Teardown process
+        bpy.ops.object.mode_set(mode='OBJECT')
+
+## usage:
+# with EditMode(mesh_object):
+#     bpy.ops.mesh.select_all(action='SELECT')
+#     bpy.ops.mesh.remove_doubles()
+#     bpy.ops.mesh.dissolve_limited()
+#     bpy.ops.mesh.tris_convert_to_quads()