Add check for non-assignment code in rules.mk (qmk#12108)

* Add check for non-assignment code in rules.mk

* fix lint check

* fix lint

* fixup to reflect the final state of qmk#8422

* fix lint

lib/python/qmk/cli/lint.py

@@ -1,72 +1,129 @@
 """Command to look over a keyboard/keymap and check for common mistakes.
 """
+from pathlib import Path
+
 from milc import cli
 
 from qmk.decorators import automagic_keyboard, automagic_keymap
 from qmk.info import info_json
-from qmk.keyboard import find_readme, keyboard_completer
+from qmk.keyboard import keyboard_completer, list_keyboards
 from qmk.keymap import locate_keymap
 from qmk.path import is_keyboard, keyboard
 
 
+def keymap_check(kb, km):
+    """Perform the keymap level checks.
+    """
+    ok = True
+    keymap_path = locate_keymap(kb, km)
+
+    if not keymap_path:
+        ok = False
+        cli.log.error("%s: Can't find %s keymap.", kb, km)
+
+    return ok
+
+
+def rules_mk_assignment_only(keyboard_path):
+    """Check the keyboard-level rules.mk to ensure it only has assignments.
+    """
+    current_path = Path()
+    errors = []
+
+    for path_part in keyboard_path.parts:
+        current_path = current_path / path_part
+        rules_mk = current_path / 'rules.mk'
+
+        if rules_mk.exists():
+            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 and '=' not in line:
+                        errors.append(f'Non-assignment code on line +{i} {rules_mk}: {line}')
+
+    return errors
+
+
 @cli.argument('--strict', action='store_true', help='Treat warnings as errors.')
 @cli.argument('-kb', '--keyboard', completer=keyboard_completer, help='The keyboard to check.')
 @cli.argument('-km', '--keymap', help='The keymap to check.')
+@cli.argument('--all-kb', action='store_true', arg_only=True, help='Check all keyboards.')
 @cli.subcommand('Check keyboard and keymap for common mistakes.')
 @automagic_keyboard
 @automagic_keymap
 def lint(cli):
     """Check keyboard and keymap for common mistakes.
     """
-    if not cli.config.lint.keyboard:
-        cli.log.error('Missing required argument: --keyboard')
-        cli.print_help()
-        return False
+    failed = []
 
-    if not is_keyboard(cli.config.lint.keyboard):
-        cli.log.error('No such keyboard: %s', cli.config.lint.keyboard)
-        return False
+    # Determine our keyboard list
+    if cli.args.all_kb:
+        if cli.args.keyboard:
+            cli.log.warning('Both --all-kb and --keyboard passed, --all-kb takes presidence.')
 
-    # Gather data about the keyboard.
-    ok = True
-    keyboard_path = keyboard(cli.config.lint.keyboard)
-    keyboard_info = info_json(cli.config.lint.keyboard)
-    readme_path = find_readme(cli.config.lint.keyboard)
-    missing_readme_path = keyboard_path / 'readme.md'
+        keyboard_list = list_keyboards()
+    elif not cli.config.lint.keyboard:
+        cli.log.error('Missing required arguments: --keyboard or --all-kb')
+        cli.print_help()
+        return False
+    else:
+        keyboard_list = cli.args.keyboard.split(',')
 
-    # Check for errors in the info.json
-    if keyboard_info['parse_errors']:
-        ok = False
-        cli.log.error('Errors found when generating info.json.')
+    # Lint each keyboard
+    for kb in keyboard_list:
+        if not is_keyboard(kb):
+            cli.log.error('No such keyboard: %s', kb)
+            continue
 
-    if cli.config.lint.strict and keyboard_info['parse_warnings']:
-        ok = False
-        cli.log.error('Warnings found when generating info.json (Strict mode enabled.)')
+        # Gather data about the keyboard.
+        ok = True
+        keyboard_path = keyboard(kb)
+        keyboard_info = info_json(kb)
 
-    # Check for a readme.md and warn if it doesn't exist
-    if not readme_path:
-        ok = False
-        cli.log.error('Missing %s', missing_readme_path)
+        # Check for errors in the info.json
+        if keyboard_info['parse_errors']:
+            ok = False
+            cli.log.error('%s: Errors found when generating info.json.', kb)
 
-    # Keymap specific checks
-    if cli.config.lint.keymap:
-        keymap_path = locate_keymap(cli.config.lint.keyboard, cli.config.lint.keymap)
+        if cli.config.lint.strict and keyboard_info['parse_warnings']:
+            ok = False
+            cli.log.error('%s: Warnings found when generating info.json (Strict mode enabled.)', kb)
 
-        if not keymap_path:
+        # Check the rules.mk file(s)
+        rules_mk_assignment_errors = rules_mk_assignment_only(keyboard_path)
+        if rules_mk_assignment_errors:
             ok = False
-            cli.log.error("Can't find %s keymap for %s keyboard.", cli.config.lint.keymap, cli.config.lint.keyboard)
-        else:
-            keymap_readme = keymap_path.parent / 'readme.md'
-            if not keymap_readme.exists():
-                cli.log.warning('Missing %s', keymap_readme)
+            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)
 
-                if cli.config.lint.strict:
-                    ok = False
+        # Keymap specific checks
+        if cli.config.lint.keymap:
+            if not keymap_check(kb, cli.config.lint.keymap):
+                ok = False
+
+        # Report status
+        if not ok:
+            failed.append(kb)
 
     # Check and report the overall status
-    if ok:
-        cli.log.info('Lint check passed!')
-        return True
+    if failed:
+        cli.log.error('Lint check failed for: %s', ', '.join(failed))
+        return False
 
-    cli.log.error('Lint check failed!')
-    return False
+    cli.log.info('Lint check passed!')
+    return True