Extend lint to reject 'blank' files

lib/python/qmk/c_parse.py

@@ -24,7 +24,7 @@ def _get_chunks(it, size):
     return iter(lambda: tuple(islice(it, size)), ())
 
 
-def _preprocess_c_file(file):
+def preprocess_c_file(file):
     """Load file and strip comments
     """
     file_contents = file.read_text(encoding='utf-8')
@@ -66,7 +66,7 @@ def find_layouts(file):
     parsed_layouts = {}
 
     # Search the file for LAYOUT macros and aliases
-    file_contents = _preprocess_c_file(file)
+    file_contents = preprocess_c_file(file)
 
     for line in file_contents.split('\n'):
         if layout_macro_define_regex.match(line.lstrip()) and '(' in line and 'LAYOUT' in line:
@@ -248,7 +248,7 @@ def _parse_led_config(file, matrix_cols, matrix_rows):
     current_row_index = 0
     current_row = []
 
-    for _type, value in lex(_preprocess_c_file(file), CLexer()):
+    for _type, value in lex(preprocess_c_file(file), CLexer()):
         if not found_g_led_config:
             # Check for type
             if value == 'led_config_t':

lib/python/qmk/cli/lint.py

@@ -10,7 +10,7 @@
 from qmk.keymap import locate_keymap, list_keymaps
 from qmk.path import keyboard
 from qmk.git import git_get_ignored_files
-from qmk.c_parse import c_source_files
+from qmk.c_parse import c_source_files, preprocess_c_file
 
 CHIBIOS_CONF_CHECKS = ['chconf.h', 'halconf.h', 'mcuconf.h', 'board.h']
 INVALID_KB_FEATURES = set(['encoder_map', 'dip_switch_map', 'combo', 'tap_dance', 'via'])
@@ -32,12 +32,42 @@ def _list_defaultish_keymaps(kb):
     return keymaps
 
 
+def _get_build_files(kb, km=None):
+    """Return potential keyboard/keymap build files
+    """
+    search_path = locate_keymap(kb, km).parent if km else keyboard(kb)
+
+    build_files = []
+
+    if not km:
+        current_path = Path()
+        for path_part in search_path.parts:
+            current_path = current_path / path_part
+            build_files.extend(current_path.glob('*rules.mk'))
+
+    for file in search_path.glob("**/*rules.mk"):
+        # Ignore keymaps when only globing keyboard files
+        if not km and 'keymaps' in file.parts:
+            continue
+        build_files.append(file)
+
+    return set(build_files)
+
+
 def _get_code_files(kb, km=None):
     """Return potential keyboard/keymap code files
     """
     search_path = locate_keymap(kb, km).parent if km else keyboard(kb)
 
     code_files = []
+
+    if not km:
+        current_path = Path()
+        for path_part in search_path.parts:
+            current_path = current_path / path_part
+            code_files.extend(current_path.glob('*.h'))
+            code_files.extend(current_path.glob('*.c'))
+
     for file in c_source_files([search_path]):
         # Ignore keymaps when only globing keyboard files
         if not km and 'keymaps' in file.parts:
@@ -47,6 +77,24 @@ def _get_code_files(kb, km=None):
     return code_files
 
 
+def _is_empty_rules(file):
+    """Check if file contains any useful content
+    """
+    for line in file.read_text(encoding='utf-8').split("\n"):
+        if len(line) > 0 and not line.isspace() and not line.startswith('#'):
+            return False
+    return True
+
+
+def _is_empty_include(file):
+    """Check if file contains any useful content
+    """
+    for line in preprocess_c_file(file).split("\n"):
+        if len(line) > 0 and not line.isspace() and not line.startswith('#pragma once'):
+            return False
+    return True
+
+
 def _has_license(file):
     """Check file has a license header
     """
@@ -90,37 +138,28 @@ def _chibios_conf_includenext_check(target):
     return None
 
 
-def _rules_mk_assignment_only(kb):
+def _rules_mk_assignment_only(rules_mk):
     """Check the keyboard-level rules.mk to ensure it only has assignments.
     """
-    keyboard_path = keyboard(kb)
-    current_path = Path()
     errors = []
+    continuation = None
+    for i, line in enumerate(rules_mk.open()):
+        line = line.strip()
 
-    for path_part in keyboard_path.parts:
-        current_path = current_path / path_part
-        rules_mk = current_path / 'rules.mk'
+        if '#' in line:
+            line = line[:line.index('#')]
 
-        if rules_mk.exists():
+        if continuation:
+            line = continuation + line
             continuation = None
 
-            for i, line in enumerate(rules_mk.open()):
-                line = line.strip()
-
-                if '#' in line:
-                    line = line[:line.index('#')]
-
-                if continuation:
-                    line = continuation + line
-                    continuation = None
-
-                if line:
-                    if line[-1] == '\\':
-                        continuation = line[:-1]
-                        continue
+        if line:
+            if line[-1] == '\\':
+                continuation = line[:-1]
+                continue
 
-                    if line and '=' not in line:
-                        errors.append(f'Non-assignment code on line +{i} {rules_mk}: {line}')
+            if line and '=' not in line:
+                errors.append(f'Non-assignment code on line +{i} {rules_mk}: {line}')
 
     return errors
 
@@ -169,25 +208,36 @@ def keyboard_check(kb):
     if not _handle_invalid_features(kb, kb_info):
         ok = False
 
-    rules_mk_assignment_errors = _rules_mk_assignment_only(kb)
-    if rules_mk_assignment_errors:
-        ok = False
-        cli.log.error('%s: Non-assignment code found in rules.mk. Move it to post_rules.mk instead.', kb)
-        for assignment_error in rules_mk_assignment_errors:
-            cli.log.error(assignment_error)
-
     invalid_files = git_get_ignored_files(f'keyboards/{kb}/')
     for file in invalid_files:
         if 'keymap' in file:
             continue
         cli.log.error(f'{kb}: The file "{file}" should not exist!')
         ok = False
 
+    for file in _get_build_files(kb):
+        if _is_empty_rules(file):
+            cli.log.error(f'{kb}: The file "{file}" is effectively empty and should be removed!')
+            ok = False
+
+        if file.suffix in ['rules.mk']:
+            rules_mk_assignment_errors = _rules_mk_assignment_only(file)
+            if rules_mk_assignment_errors:
+                ok = False
+                cli.log.error('%s: Non-assignment code found in rules.mk. Move it to post_rules.mk instead.', kb)
+                for assignment_error in rules_mk_assignment_errors:
+                    cli.log.error(assignment_error)
+
     for file in _get_code_files(kb):
         if not _has_license(file):
             cli.log.error(f'{kb}: The file "{file}" does not have a license header!')
             ok = False
 
+        if file.name in ['config.h']:
+            if _is_empty_include(file):
+                cli.log.error(f'{kb}: The file "{file}" is effectively empty and should be removed!')
+                ok = False
+
         if file.name in CHIBIOS_CONF_CHECKS:
             check_error = _chibios_conf_includenext_check(file)
             if check_error is not None: