Allow <keyboard>.h to be optional when going data driven (#12706)

* Allow <keyboard>.h to be optional when going data driven

* Remove stub files as no longer required

* Rename function

* Remove include of layouts.h for now

* Take advantage of type=keyboard_folder

* Take advantage of type=keyboard_folder - kb should still be mandatory

5 files changed, 66 insertions, 35 deletions

diff --git a/build_keyboard.mk b/build_keyboard.mk
index 366d1f5d2f..ec6b026c50 100644
--- a/build_keyboard.mk
+++ b/build_keyboard.mk
@@ -205,6 +205,7 @@ endif
 #
 #    https://docs.qmk.fm/#/feature_layouts?id=tips-for-making-layouts-keyboard-agnostic
 #
+QMK_KEYBOARD_H = $(KEYBOARD_OUTPUT)/src/default_keyboard.h
 ifneq ("$(wildcard $(KEYBOARD_PATH_1)/$(KEYBOARD_FOLDER_1).h)","")
     QMK_KEYBOARD_H = $(KEYBOARD_FOLDER_1).h
 endif
@@ -296,10 +297,13 @@ CONFIG_H += $(KEYBOARD_OUTPUT)/src/info_config.h $(KEYBOARD_OUTPUT)/src/layouts.
 $(KEYBOARD_OUTPUT)/src/info_config.h: $(INFO_JSON_FILES)
 	bin/qmk generate-config-h --quiet --keyboard $(KEYBOARD) --output $(KEYBOARD_OUTPUT)/src/info_config.h
 
+$(KEYBOARD_OUTPUT)/src/default_keyboard.h: $(INFO_JSON_FILES)
+	bin/qmk generate-keyboard-h --quiet --keyboard $(KEYBOARD) --output $(KEYBOARD_OUTPUT)/src/default_keyboard.h
+
 $(KEYBOARD_OUTPUT)/src/layouts.h: $(INFO_JSON_FILES)
 	bin/qmk generate-layouts --quiet --keyboard $(KEYBOARD) --output $(KEYBOARD_OUTPUT)/src/layouts.h
 
-generated-files: $(KEYBOARD_OUTPUT)/src/info_config.h $(KEYBOARD_OUTPUT)/src/layouts.h
+generated-files: $(KEYBOARD_OUTPUT)/src/info_config.h $(KEYBOARD_OUTPUT)/src/default_keyboard.h $(KEYBOARD_OUTPUT)/src/layouts.h
 
 .INTERMEDIATE : generated-files
 
diff --git a/keyboards/forever65/forever65.c b/keyboards/forever65/forever65.c
deleted file mode 100644
index 940f3300f1..0000000000
--- a/keyboards/forever65/forever65.c
+++ /dev/null
@@ -1,16 +0,0 @@
-/* Copyright 2021 zvecr<git@zvecr.com>
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-#include "forever65.h"
diff --git a/keyboards/forever65/forever65.h b/keyboards/forever65/forever65.h
deleted file mode 100644
index 0edfd0b456..0000000000
--- a/keyboards/forever65/forever65.h
+++ /dev/null
@@ -1,18 +0,0 @@
-/* Copyright 2021 zvecr<git@zvecr.com>
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-#pragma once
-
-#include "quantum.h"
\ No newline at end of file
diff --git a/lib/python/qmk/cli/generate/__init__.py b/lib/python/qmk/cli/generate/__init__.py
index f064649ac7..0efca0022d 100644
--- a/lib/python/qmk/cli/generate/__init__.py
+++ b/lib/python/qmk/cli/generate/__init__.py
@@ -3,6 +3,7 @@ from . import config_h
 from . import dfu_header
 from . import docs
 from . import info_json
+from . import keyboard_h
 from . import layouts
 from . import rgb_breathe_table
 from . import rules_mk
diff --git a/lib/python/qmk/cli/generate/keyboard_h.py b/lib/python/qmk/cli/generate/keyboard_h.py
new file mode 100755
index 0000000000..5a2b3656ec
--- /dev/null
+++ b/lib/python/qmk/cli/generate/keyboard_h.py
@@ -0,0 +1,60 @@
+"""Used by the make system to generate keyboard.h from info.json.
+"""
+from milc import cli
+
+from qmk.decorators import automagic_keyboard, automagic_keymap
+from qmk.info import info_json
+from qmk.keyboard import keyboard_completer, keyboard_folder
+from qmk.path import is_keyboard, normpath
+
+
+def would_populate_layout_h(keyboard):
+    """Detect if a given keyboard is doing data driven layouts
+    """
+    # Build the info.json file
+    kb_info_json = info_json(keyboard)
+
+    for layout_name in kb_info_json['layouts']:
+        if kb_info_json['layouts'][layout_name]['c_macro']:
+            continue
+
+        if 'matrix' not in kb_info_json['layouts'][layout_name]['layout'][0]:
+            cli.log.debug('%s/%s: No matrix data!', keyboard, layout_name)
+            continue
+
+        return True
+
+    return False
+
+
+@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', type=keyboard_folder, completer=keyboard_completer, required=True, help='Keyboard to generate keyboard.h for.')
+@cli.subcommand('Used by the make system to generate keyboard.h from info.json', hidden=True)
+@automagic_keyboard
+@automagic_keymap
+def generate_keyboard_h(cli):
+    """Generates the keyboard.h file.
+    """
+    has_layout_h = would_populate_layout_h(cli.config.generate_keyboard_h.keyboard)
+
+    # Build the layouts.h file.
+    keyboard_h_lines = ['/* This file was generated by `qmk generate-keyboard-h`. Do not edit or copy.' ' */', '', '#pragma once', '#include "quantum.h"']
+
+    if not has_layout_h:
+        keyboard_h_lines.append('#pragma error("<keyboard>.h is only optional for data driven keyboards - kb.h == bad times")')
+
+    # Show the results
+    keyboard_h = '\n'.join(keyboard_h_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.parent / (cli.args.output.name + '.bak'))
+        cli.args.output.write_text(keyboard_h)
+
+        if not cli.args.quiet:
+            cli.log.info('Wrote keyboard_h to %s.', cli.args.output)
+
+    else:
+        print(keyboard_h)