[CLI] Add c2json (#8817)

* Basic keymap parsing finally works

* Add 'keymap.json' creation to the qmk.keymap module

* Add tests and fix formatting

* Fix/exclude flake8 errors

* Convert keymap.c to valid keymap.json

* Fix some errors

* Add tests

* Finalize keymap.json creation, add json template

* Add docs

* Move pygments to the standard requirements

* Add support for nameless layers, fix tests

* Fix things after rebase

* Add missing 'keymap' value.

* Fix missing layer numbers from advanced keycodes

Buckwich noticed that if the advanced keycode / layer toggling key
contains a number, it goes missing.
Now we properly handle them.
Thx for noticing!

* Apply suggestions from code review

* fixup tests

Co-authored-by: Zach White <skullydazed@drpepper.org>
Co-authored-by: skullY <skullydazed@gmail.com>

3 files changed, 64 insertions, 1 deletions

diff --git a/lib/python/qmk/cli/__init__.py b/lib/python/qmk/cli/__init__.py
index 47f60c601b..ba964ebbbb 100644
--- a/lib/python/qmk/cli/__init__.py
+++ b/lib/python/qmk/cli/__init__.py
@@ -6,6 +6,7 @@ import sys
 
 from milc import cli
 
+from . import c2json
 from . import cformat
 from . import compile
 from . import config
diff --git a/lib/python/qmk/cli/c2json.py b/lib/python/qmk/cli/c2json.py
new file mode 100644
index 0000000000..0267303fd2
--- /dev/null
+++ b/lib/python/qmk/cli/c2json.py
@@ -0,0 +1,62 @@
+"""Generate a keymap.json from a keymap.c file.
+"""
+import json
+import sys
+
+from milc import cli
+
+import qmk.keymap
+import qmk.path
+
+
+@cli.argument('--no-cpp', arg_only=True, action='store_false', help='Do not use \'cpp\' on keymap.c')
+@cli.argument('-o', '--output', arg_only=True, type=qmk.path.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', arg_only=True, required=True, help='The keyboard\'s name')
+@cli.argument('-km', '--keymap', arg_only=True, required=True, help='The keymap\'s name')
+@cli.argument('filename', arg_only=True, help='keymap.c file')
+@cli.subcommand('Creates a keymap.json from a keymap.c file.')
+def c2json(cli):
+    """Generate a keymap.json from a keymap.c file.
+
+    This command uses the `qmk.keymap` module to generate a keymap.json from a keymap.c file. The generated keymap is written to stdout, or to a file if -o is provided.
+    """
+    cli.args.filename = qmk.path.normpath(cli.args.filename)
+
+    # Error checking
+    if not cli.args.filename.exists():
+        cli.log.error('C file does not exist!')
+        cli.print_usage()
+        exit(1)
+
+    if str(cli.args.filename) == '-':
+        # TODO(skullydazed/anyone): Read file contents from STDIN
+        cli.log.error('Reading from STDIN is not (yet) supported.')
+        cli.print_usage()
+        exit(1)
+
+    # Environment processing
+    if cli.args.output == ('-'):
+        cli.args.output = None
+
+    # Parse the keymap.c
+    keymap_json = qmk.keymap.c2json(cli.args.keyboard, cli.args.keymap, cli.args.filename, use_cpp=cli.args.no_cpp)
+
+    # Generate the keymap.json
+    try:
+        keymap_json = qmk.keymap.generate(keymap_json['keyboard'], keymap_json['layout'], keymap_json['layers'], type='json', keymap=keymap_json['keymap'])
+    except KeyError:
+        cli.log.error('Something went wrong. Try to use --no-cpp.')
+        sys.exit(1)
+
+    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(json.dumps(keymap_json))
+
+        if not cli.args.quiet:
+            cli.log.info('Wrote keymap to %s.', cli.args.output)
+
+    else:
+        print(json.dumps(keymap_json))
diff --git a/lib/python/qmk/cli/doctor.py b/lib/python/qmk/cli/doctor.py
index 984c308d1e..7fafd57575 100755
--- a/lib/python/qmk/cli/doctor.py
+++ b/lib/python/qmk/cli/doctor.py
@@ -58,7 +58,7 @@ def parse_gcc_version(version):
     return {
         'major': int(m.group(1)),
         'minor': int(m.group(2)) if m.group(2) else 0,
-        'patch': int(m.group(3)) if m.group(3) else 0
+        'patch': int(m.group(3)) if m.group(3) else 0,
     }