Implement json import/export of custom templates (in preferences and File > Defaults > Import/Export)

addon/__init__.py

@@ -14,7 +14,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
 import bpy
-from .classes.ots import CustomTemplatesPreferences, TemplateItem, OT_SelectTemplatePopup, OT_AddTemplatePopup, OT_AddTemplateItem, OT_RemoveTemplateItem, OT_MoveDownTemplateItem, OT_MoveUpTemplateItem, OT_OpenAddonPreferences
+from .classes.ots import CustomTemplatesPreferences, TemplateItem, OT_ExportTemplates, OT_ImportTemplates, CUSTOM_MT_Export_Menu, OT_SelectTemplatePopup, OT_AddTemplatePopup, OT_AddTemplateItem, OT_RemoveTemplateItem, OT_MoveDownTemplateItem, OT_MoveUpTemplateItem, OT_OpenAddonPreferences
 
 bl_info = {
     "id": "custom_templates",
@@ -49,6 +49,9 @@ def draw_file_default_operators(self, context):
     # Manage Template
     layout.operator("custom_templates.open_preferences",
                     text="Manage templates")
+    # Import/Export
+    layout.menu("custom_templates.export_menu", text="Import/Export")
+    layout.separator()
     # Select new custom template
     layout.operator("custom_templates.select_template_popup",
                     text="Select new custom template")
@@ -58,6 +61,9 @@ def draw_file_default_operators(self, context):
                         text="Use current as new template")
 
 classes = [TemplateItem,
+           OT_ExportTemplates,
+           OT_ImportTemplates,
+           CUSTOM_MT_Export_Menu,
            OT_MoveUpTemplateItem,
            OT_MoveDownTemplateItem,
            OT_AddTemplateItem,

addon/classes/ots.py

@@ -1,5 +1,6 @@
 from .. import __package__ as base_package
 import bpy
+import json
 from bpy.types import Operator, PropertyGroup, AddonPreferences
 from bpy.props import StringProperty, CollectionProperty, IntProperty
 
@@ -30,8 +31,11 @@ class CustomTemplatesPreferences(AddonPreferences):
                           self, "projects", self, "active_template_index")
 
         col = row.column(align=True)
+        col.menu("custom_templates.export_menu", icon='DOWNARROW_HLT', text="")
+        col.separator()
         col.operator("custom_templates.add", icon='ADD', text="")
         col.operator("custom_templates.remove", icon='REMOVE', text="")
+        col.separator()
         col.operator("custom_templates.move_up", icon='TRIA_UP', text="")
         col.operator("custom_templates.move_down", icon='TRIA_DOWN', text="")
 
@@ -39,6 +43,62 @@ class CustomTemplatesPreferences(AddonPreferences):
             project = self.projects[self.active_template_index]
             layout.prop(project, "name")
             layout.prop(project, "path")
+            
+class CUSTOM_MT_Export_Menu(bpy.types.Menu):
+    bl_idname = "custom_templates.export_menu"
+    bl_label = "Import/Export custom templates"
+    bl_description = "Allows you to save al load your custom templates (using json format)"
+
+    def draw(self, context):
+        layout = self.layout
+        layout.operator("custom_templates.export_templates", text="Export templates")
+        layout.operator("custom_templates.import_templates", text="Import templates")
+
+class OT_ExportTemplates(bpy.types.Operator):
+    bl_idname = "custom_templates.export_templates"
+    bl_label = "Export custom templates"
+    bl_description = "Export the current list of templates to JSON file"
+
+    filepath: StringProperty(subtype="FILE_PATH", description="Select the path for the exported file", default="custom_templates.json")
+
+    def execute(self, context):
+        prefs = context.preferences.addons[base_package].preferences
+        with open(self.filepath, 'w') as f:
+            projects = [{"name": project.name, "path": project.path} for project in prefs.projects]
+            json.dump(projects, f, indent=4)
+
+        self.report({'INFO'}, f"Templates exported to {self.filepath}")
+        return {'FINISHED'}
+
+    def invoke(self, context, event):
+        context.window_manager.fileselect_add(self)
+        return {'RUNNING_MODAL'}
+
+class OT_ImportTemplates(bpy.types.Operator):
+    bl_idname = "custom_templates.import_templates"
+    bl_label = "Import custom templates"
+    bl_description = "Import a list of templates from JSON file (note that this will override the current templates list)"
+
+    filepath: StringProperty(subtype="FILE_PATH", description="Select the .json file to load")
+
+    def execute(self, context):
+        prefs = context.preferences.addons[base_package].preferences
+
+        with open(self.filepath, 'r') as f:
+            projects = json.load(f)
+
+        prefs.projects.clear()
+        for project in projects:
+            item = prefs.projects.add()
+            item.name = project["name"]
+            item.path = project["path"]
+
+        self.report({'INFO'}, f"Projects imported from {self.filepath}")
+        return {'FINISHED'}
+
+    def invoke(self, context, event):
+        context.window_manager.fileselect_add(self)
+        return {'RUNNING_MODAL'}
 
 # Templates list oeprators
 class OT_AddTemplateItem(Operator):