display current commit in status bar

it works for users who symlinked their blenderbim/bim folders to git repository or installed blenderbim from release created from makefile
https://i.imgur.com/mEBH9I7.png

src/blenderbim/Makefile

@@ -36,6 +36,7 @@ endif
 endif
 
 VERSION:=`date '+%y%m%d'`
+LAST_COMMIT_HASH:=$(git rev-parse HEAD)
 PYVERSION:=py310
 
 ifeq ($(PYVERSION), py39)
@@ -675,6 +676,7 @@ endif
 	rm -rf dist/blenderbim/libs/site/packages/numpy.libs
 
 	cd dist/blenderbim && $(SED) "s/999999/$(VERSION)/" __init__.py
+	cd dist/blenderbim/bim && $(SED) "s/8888888/$(LAST_COMMIT_HASH)/" __init__.py
 	cd dist && zip -r blenderbim-$(VERSION)-$(PYVERSION)-$(PLATFORM).zip ./*
 	rm -rf dist/blenderbim
 

src/blenderbim/blenderbim/bim/__init__.py

@@ -17,6 +17,7 @@
 # along with BlenderBIM Add-on.  If not, see <http://www.gnu.org/licenses/>.
 
 import os
+from pathlib import Path
 import bpy
 import bpy.utils.previews
 import blenderbim
@@ -150,6 +151,7 @@ for mod in modules.values():
 addon_keymaps = []
 icons = None
 is_registering = False
+last_commit_hash = "8888888"
 
 
 def on_register(scene):
@@ -209,6 +211,14 @@ def register():
 
     icons = icon_preview
 
+    global last_commit_hash
+    try:
+        import git
+        path = Path(__file__).resolve().parent
+        repo = git.Repo(str(path), search_parent_directories=True)
+        last_commit_hash = repo.head.object.hexsha
+    except:
+        pass
 
 def unregister():
     global icons

src/blenderbim/blenderbim/bim/ui.py

@@ -30,6 +30,7 @@ from ifcopenshell.util.doc import (
 )
 from . import ifc
 import blenderbim.tool as tool
+import blenderbim.bim
 from blenderbim.bim.helper import IfcHeaderExtractor
 from blenderbim.bim.prop import Attribute
 
@@ -542,7 +543,10 @@ class UIData:
 def draw_statusbar(self, context):
     if not UIData.is_loaded:
         UIData.load()
-    self.layout.label(text=f"BlenderBIM Add-on v{UIData.data['version']}")
+    text = f"BlenderBIM Add-on v{UIData.data['version']}"
+    if blenderbim.bim.last_commit_hash != "8888888":
+        text += f"@{blenderbim.bim.last_commit_hash[:7]}"
+    self.layout.label(text=text)
 
 
 def draw_custom_context_menu(self, context):