Prevents VariantDir from duplicating source files

SConstruct

@@ -14,7 +14,7 @@ if _SCRIPTS_DIR not in sys.path:
 
 # Local
 from build.option_handler import OptionsClass
-from build.glob_recursive import GlobRecursive
+from build.glob_recursive import GlobRecursive, GlobRecursiveVariant
 from build.git_info import get_git_info, git_builder
 from build.license_info import license_builder
 from build.author_info import author_builder
@@ -287,6 +287,7 @@ def FinalizeOptions():
 env.SetupOptions = SetupOptions
 env.FinalizeOptions = FinalizeOptions
 env.GlobRecursive = GlobRecursive
+env.GlobRecursiveVariant = lambda pattern, src, variant, exclude=None: GlobRecursiveVariant(env, pattern, src, variant, exclude)
 env.get_git_info = get_git_info
 env.license_builder = license_builder
 env.git_builder = git_builder

build/glob_recursive.py

@@ -29,3 +29,23 @@ def norm(s):
         norm_exclude = [norm(p) for p in exclude]
         results = [r for r in results if not any(fnmatch.fnmatch(norm(r), p) for p in norm_exclude)]
     return results
+
+
+def GlobRecursiveVariant(env, pattern, src_root, variant_root, exclude=None):
+    src_nodes = GlobRecursive(pattern, [src_root])
+    src_abs = env.Dir(src_root).abspath.replace("\\", "/").rstrip("/") + "/"
+    variant_prefix = env.Dir(variant_root).abspath.replace("\\", "/").rstrip("/") + "/"
+    if exclude is None:
+        exclude_abs = set()
+    else:
+        if isinstance(exclude, str):
+            exclude = [exclude]
+        exclude_abs = {env.File(e).abspath.replace("\\", "/") for e in exclude}
+    out = []
+    for n in src_nodes:
+        p = n.abspath.replace("\\", "/")
+        if p in exclude_abs:
+            continue
+        assert p.startswith(src_abs), f"{p!r} not under {src_abs!r}"
+        out.append(env.File(variant_prefix + p[len(src_abs) :]))
+    return out