1 files changed, 78 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..b262e3c666
--- /dev/null
+++ b/lib/python/qmk/cli/generate/rules_mk.py
@@ -0,0 +1,78 @@
+"""Used by the make system to generate a rules.mk
+"""
+from milc import cli
+
+from qmk.decorators import automagic_keyboard, automagic_keymap
+from qmk.info import info_json
+from qmk.path import is_keyboard, normpath
+
+info_to_rules = {
+    'board': 'BOARD',
+    'bootloader': 'BOOTLOADER',
+    'processor': 'MCU',
+}
+
+
+@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.
+    """
+    # Determine our keyboard(s)
+    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
+
+    # Build the info.json file
+    kb_info_json = info_json(cli.config.generate_rules_mk.keyboard)
+    rules_mk_lines = ['# This file was generated by `qmk generate-rules-mk`. Do not edit or copy.', '']
+
+    # Bring in settings
+    for info_key, rule_key in info_to_rules.items():
+        if info_key in kb_info_json:
+            rules_mk_lines.append(f'{rule_key} ?= {kb_info_json[info_key]}')
+
+    # Find features that should be enabled
+    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}')
+
+    # Set the LED driver
+    if 'led_matrix' in kb_info_json and 'driver' in kb_info_json['led_matrix']:
+        driver = kb_info_json['led_matrix']['driver']
+        rules_mk_lines.append(f'LED_MATRIX_DRIVER ?= {driver}')
+
+    # Add community layouts
+    if 'community_layouts' in kb_info_json:
+        rules_mk_lines.append(f'LAYOUTS ?= {" ".join(kb_info_json["community_layouts"])}')
+
+    # 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 info_config.h to %s.', cli.args.output)
+
+    else:
+        print(rules_mk)