BBIM Ensure LF end-of-line in Git repo (#3096)

Git auto text detection seems to fail with IFC files, possibly due to
long lines. So we now force detection as text which ensures conversion
from CRLF to LF when adding to the repository. We also convert the local
IFC file to LF otherwise Git thinks that the local file is out-of-sync
with the repo version ¯\_(ツ)_/¯

src/blenderbim/blenderbim/tool/ifcgit.py

@@ -16,22 +16,13 @@ class IfcGit:
     @classmethod
     def init_repo(cls, path_dir):
         IfcGitRepo.repo = git.Repo.init(path_dir)
-        autocrlf = "input"
-        if os.name == "nt":
-            autocrlf = "true"
-        IfcGitRepo.repo.config_writer().set_value("core", "autocrlf", autocrlf)
         cls.config_info_attributes(IfcGitRepo.repo)
 
     @classmethod
     def clone_repo(cls, remote_url, local_folder):
-        autocrlf = "input"
-        if os.name == "nt":
-            autocrlf = "true"
         IfcGitRepo.repo = git.Repo.clone_from(
             url=remote_url,
             to_path=local_folder,
-            allow_unsafe_options=True,
-            multi_options=["--config core.autocrlf=" + autocrlf],
         )
         cls.config_info_attributes(IfcGitRepo.repo)
         return IfcGitRepo.repo
@@ -78,6 +69,8 @@ class IfcGit:
 
     @classmethod
     def add_file_to_repo(cls, repo, path_file):
+        if os.name == "nt":
+            cls.dos2unix(path_file)
         repo.index.add(path_file)
         repo.index.commit(message="Added " + os.path.relpath(path_file, repo.working_dir))
         bpy.ops.ifcgit.refresh()
@@ -90,6 +83,8 @@ class IfcGit:
     def git_commit(cls, path_file):
         props = bpy.context.scene.IfcGitProperties
         repo = IfcGitRepo.repo
+        if os.name == "nt":
+            cls.dos2unix(path_file)
         repo.index.add(path_file)
         repo.index.commit(message=props.commit_message)
         props.commit_message = ""
@@ -375,8 +370,16 @@ class IfcGit:
         path_attributes = os.path.join(repo.git_dir, "info", "attributes")
         if not os.path.exists(path_attributes):
             with open(path_attributes, "w") as f:
-                f.write("*.ifc text\n")
-                f.write("*.IFC text")
+                # attributes patterns are case-insensitive
+                f.write("*.ifc text")
+
+    @classmethod
+    def dos2unix(cls, path_file):
+        with open(path_file, "rb") as infile:
+            content = infile.read()
+        with open(path_file, "wb") as output:
+            for line in content.splitlines():
+                output.write(line + b"\n")
 
     @classmethod
     def execute_merge(cls, path_ifc, operator):