bl_info = {
    "name": "Camera Fit View",
    "author": "Yashar JafarKhanpour",
    "version": (1, 0),
    "blender": (2, 80, 0),
    "location": "View3D > View > Cameras > Camera Fit View, Camera From View",
    "category": "3D View",
    "description": "Add two operators to Cameras menu: Align Camera to View, Create Camera from view",
}


import bpy
from bpy.types import Operator


class VIEW3D_OT_camera_fit_view(Operator):
    """Align and fit camera to view and match lens properties.
    Works on selected camera or scene camera if no camera is selected.
    Creates new camera if checked in options"""
    
    bl_idname = "view3d.camera_fit_view"
    bl_label = "Camera to View"
    bl_options = {'UNDO'}

    new : bpy.props.BoolProperty(name="Create New Camera",options = {'SKIP_SAVE'})


    @classmethod
    def poll(cls,context):
        return context.space_data.region_3d.view_perspective != 'CAMERA'

    def execute(self, context):
        if self.new:
            bpy.ops.object.camera_add() 
        obj = context.object
        spd = context.space_data
        cam = context.scene.camera
        if obj and obj.type == 'CAMERA' and obj != cam: 
            cam = context.scene.camera = obj
        if cam:
            bpy.ops.view3d.camera_to_view()
            
            cam.data.sensor_width = 72       
            cam.data.lens = spd.lens
            cam.data.clip_start = spd.clip_start
            cam.data.clip_end = spd.clip_end
            spd.region_3d.view_camera_offset = [0,0]
            spd.region_3d.view_camera_zoom = 29.0746
        
            
        return {'FINISHED'}



def add_menu_item(self, context):
    self.layout.operator(VIEW3D_OT_camera_fit_view.bl_idname,text="Fit Camera to View")
    self.layout.operator(VIEW3D_OT_camera_fit_view.bl_idname,text="Create Camera from View").new=True

def register():
    bpy.utils.register_class(VIEW3D_OT_camera_fit_view)
    bpy.types.VIEW3D_MT_view_cameras.append(add_menu_item)
    
def unregister():
    bpy.utils.unregister_class(VIEW3D_OT_camera_fit_view)
    bpy.types.VIEW3D_MT_view_cameras.remove(add_menu_item)


if __name__ == "__main__":
    register()