Added option for ImGui recipe to build from a docking build and to provide backends to compile via options.

addons/gitbranch.py

@@ -71,7 +71,11 @@ def _git_recipe(env: Environment, globals: dict, repo_name, repo_url, cook_fn, v
     def _versions(env: Environment, update: bool = False, options: dict = {}):
         if 'ref' in options:
             return [(0, 0, 0)] # no versions if compiling from a branch
-        pattern = _tag_pattern(env)
+        pattern_signature = inspect.signature(_tag_pattern)
+        kwargs = {}
+        if 'options' in pattern_signature.parameters:
+            kwargs['options'] = options
+        pattern = _tag_pattern(env, **kwargs)
         if pattern:
             tags = env.GitTags(repo_name = _repo_name(env), remote_url = _repo_url(env), force_fetch=update)
             result = []
@@ -94,7 +98,11 @@ def _git_recipe(env: Environment, globals: dict, repo_name, repo_url, cook_fn, v
         if 'ref' in options:
             git_ref = options['ref']
         elif tag_fn:
-            git_ref = f'refs/tags/{tag_fn(version)}'
+            tag_signature = inspect.signature(tag_fn)
+            kwargs = {}
+            if 'options' in tag_signature.parameters:
+                kwargs['options'] = options
+            git_ref = f'refs/tags/{tag_fn(version, **kwargs)}'
         else:
             assert ref_fn
             git_ref = ref_fn(env, version)