1 files changed, 91 insertions, 0 deletions
diff --git a/lib/python/qmk/cli/generate/rules_mk.py b/lib/python/qmk/cli/generate/rules_mk.py
new file mode 100755
index 0000000000..af740f341d
--- /dev/null
+++ b/lib/python/qmk/cli/generate/rules_mk.py
@@ -0,0 +1,91 @@
+"""Used by the make system to generate a rules.mk
+"""
+from pathlib import Path
+
+from dotty_dict import dotty
+from milc import cli
+
+from qmk.decorators import automagic_keyboard, automagic_keymap
+from qmk.info import _json_load, info_json
+from qmk.path import is_keyboard, normpath
+
+
+def process_mapping_rule(kb_info_json, rules_key, info_dict):
+    """Return the rules.mk line(s) for a mapping rule.
+    """
+    if not info_dict.get('to_c', True):
+        return None
+
+    info_key = info_dict['info_key']
+    key_type = info_dict.get('value_type', 'str')
+
+    try:
+        rules_value = kb_info_json[info_key]
+    except KeyError:
+        return None
+
+    if key_type == 'array':
+        return f'{rules_key} ?= {" ".join(rules_value)}'
+    elif key_type == 'bool':
+        return f'{rules_key} ?= {"on" if rules_value else "off"}'
+    elif key_type == 'mapping':
+        return '\n'.join([f'{key} ?= {value}' for key, value in rules_value.items()])
+
+    return f'{rules_key} ?= {rules_value}'
+
+
+@cli.argument('-o', '--output', arg_only=True, type=normpath, help='File to write to')
+@cli.argument('-q', '--quiet', arg_only=True, action='store_true', help="Quiet mode, only output error messages")
+@cli.argument('-kb', '--keyboard', help='Keyboard to generate config.h for.')
+@cli.subcommand('Used by the make system to generate info_config.h from info.json', hidden=True)
+@automagic_keyboard
+@automagic_keymap
+def generate_rules_mk(cli):
+    """Generates a rules.mk file from info.json.
+    """
+    if not cli.config.generate_rules_mk.keyboard:
+        cli.log.error('Missing paramater: --keyboard')
+        cli.subcommands['info'].print_help()
+        return False
+
+    if not is_keyboard(cli.config.generate_rules_mk.keyboard):
+        cli.log.error('Invalid keyboard: "%s"', cli.config.generate_rules_mk.keyboard)
+        return False
+
+    kb_info_json = dotty(info_json(cli.config.generate_rules_mk.keyboard))
+    info_rules_map = _json_load(Path('data/mappings/info_rules.json'))
+    rules_mk_lines = ['# This file was generated by `qmk generate-rules-mk`. Do not edit or copy.', '']
+
+    # Iterate through the info_rules map to generate basic rules
+    for rules_key, info_dict in info_rules_map.items():
+        new_entry = process_mapping_rule(kb_info_json, rules_key, info_dict)
+
+        if new_entry:
+            rules_mk_lines.append(new_entry)
+
+    # Iterate through features to enable/disable them
+    if 'features' in kb_info_json:
+        for feature, enabled in kb_info_json['features'].items():
+            if feature == 'bootmagic_lite' and enabled:
+                rules_mk_lines.append('BOOTMAGIC_ENABLE ?= lite')
+            else:
+                feature = feature.upper()
+                enabled = 'yes' if enabled else 'no'
+                rules_mk_lines.append(f'{feature}_ENABLE ?= {enabled}')
+
+    # Show the results
+    rules_mk = '\n'.join(rules_mk_lines) + '\n'
+
+    if cli.args.output:
+        cli.args.output.parent.mkdir(parents=True, exist_ok=True)
+        if cli.args.output.exists():
+            cli.args.output.replace(cli.args.output.name + '.bak')
+        cli.args.output.write_text(rules_mk)
+
+        if cli.args.quiet:
+            print(cli.args.output)
+        else:
+            cli.log.info('Wrote rules.mk to %s.', cli.args.output)
+
+    else:
+        print(rules_mk)