Refactor and simplify install_subdir()

- Pass exclude_files and exclude_directories relative to src_dir,
  same as specified by user and documented in public install_subdir().
- Make do_copydir() interface similar to do_copyfile():
  install src_dir contents to dst_dir.
- Remove src_prefix/src_dir code, it adds confusion and duplicates arguments.
  Use single src_dir parameter instead.
- Make callers specify that src_dir contents should be installed
  under dst_dir/basename(src_dir) if necessary.
- Use os.path.relpath() instead of string manipulations on paths.
- Add documentation to do_copydir(): specify types and add usage example.

1 files changed, 2 insertions, 2 deletions

diff --git a/mesonbuild/interpreter.py b/mesonbuild/interpreter.py
index 072994a..9c2a6b9 100644
--- a/mesonbuild/interpreter.py
+++ b/mesonbuild/interpreter.py
@@ -2681,7 +2681,7 @@ root and issuing %s.
                     raise InvalidArguments('Exclude argument not a string.')
                 elif os.path.isabs(f):
                     raise InvalidArguments('Exclude argument cannot be absolute.')
-            exclude_files = {os.path.join(subdir, f) for f in exclude}
+            exclude_files = set(exclude)
         else:
             exclude_files = set()
         if 'exclude_directories' in kwargs:
@@ -2691,7 +2691,7 @@ root and issuing %s.
                     raise InvalidArguments('Exclude argument not a string.')
                 elif os.path.isabs(d):
                     raise InvalidArguments('Exclude argument cannot be absolute.')
-            exclude_directories = {os.path.join(subdir, f) for f in exclude}
+            exclude_directories = set(exclude)
         else:
             exclude_directories = set()
         exclude = (exclude_files, exclude_directories)