CLI: Add 'via2json' subcommand (#16468)

5 files changed, 176 insertions, 2 deletions

diff --git a/docs/cli_commands.md b/docs/cli_commands.md
index 93af906b8a..463abcef12 100644
--- a/docs/cli_commands.md
+++ b/docs/cli_commands.md
@@ -335,6 +335,23 @@ This command cleans up the `.build` folder. If `--all` is passed, any .hex or .b
 qmk clean [-a]
 ```
 
+## `qmk via2json`
+
+This command an generate a keymap.json from a VIA keymap backup. Both the layers and the macros are converted, enabling users to easily move away from a VIA-enabled firmware without writing any code or reimplementing their keymaps in QMK Configurator.
+
+**Usage**:
+
+```
+qmk via2json -kb KEYBOARD [-l LAYOUT] [-km KEYMAP] [-o OUTPUT] filename
+```
+
+**Example:**
+
+```
+$ qmk via2json -kb ai03/polaris -o polaris_keymap.json polaris_via_backup.json
+Ψ Wrote keymap to /home/you/qmk_firmware/polaris_keymap.json
+```
+
 ---
 
 # Developer Commands
diff --git a/lib/python/qmk/cli/__init__.py b/lib/python/qmk/cli/__init__.py
index c51eece955..5f65e677e5 100644
--- a/lib/python/qmk/cli/__init__.py
+++ b/lib/python/qmk/cli/__init__.py
@@ -69,6 +69,7 @@ subcommands = [
     'qmk.cli.new.keymap',
     'qmk.cli.pyformat',
     'qmk.cli.pytest',
+    'qmk.cli.via2json',
 ]
 
 
diff --git a/lib/python/qmk/cli/via2json.py b/lib/python/qmk/cli/via2json.py
new file mode 100755
index 0000000000..6edc9dfbe5
--- /dev/null
+++ b/lib/python/qmk/cli/via2json.py
@@ -0,0 +1,145 @@
+"""Generate a keymap.c from a configurator export.
+"""
+import json
+import re
+
+from milc import cli
+
+import qmk.keyboard
+import qmk.path
+from qmk.info import info_json
+from qmk.json_encoders import KeymapJSONEncoder
+from qmk.commands import parse_configurator_json, dump_lines
+from qmk.keymap import generate_json, list_keymaps, locate_keymap, parse_keymap_c
+
+
+def _find_via_layout_macro(keyboard):
+    keymap_layout = None
+    if 'via' in list_keymaps(keyboard):
+        keymap_path = locate_keymap(keyboard, 'via')
+        if keymap_path.suffix == '.json':
+            keymap_layout = parse_configurator_json(keymap_path)['layout']
+        else:
+            keymap_layout = parse_keymap_c(keymap_path)['layers'][0]['layout']
+    return keymap_layout
+
+
+def _convert_macros(via_macros):
+    via_macros = list(filter(lambda f: bool(f), via_macros))
+    if len(via_macros) == 0:
+        return list()
+    split_regex = re.compile(r'(}\,)|(\,{)')
+    macros = list()
+    for via_macro in via_macros:
+        # Split VIA macro to its elements
+        macro = split_regex.split(via_macro)
+        # Remove junk elements (None, '},' and ',{')
+        macro = list(filter(lambda f: False if f in (None, '},', ',{') else True, macro))
+        macro_data = list()
+        for m in macro:
+            if '{' in m or '}' in m:
+                # Found keycode(s)
+                keycodes = m.split(',')
+                # Remove whitespaces and curly braces from around keycodes
+                keycodes = list(map(lambda s: s.strip(' {}'), keycodes))
+                # Remove the KC prefix
+                keycodes = list(map(lambda s: s.replace('KC_', ''), keycodes))
+                macro_data.append({"action": "tap", "keycodes": keycodes})
+            else:
+                # Found text
+                macro_data.append(m)
+        macros.append(macro_data)
+
+    return macros
+
+
+def _fix_macro_keys(keymap_data):
+    macro_no = re.compile(r'MACRO0?([0-9]{1,2})')
+    for i in range(0, len(keymap_data)):
+        for j in range(0, len(keymap_data[i])):
+            kc = keymap_data[i][j]
+            m = macro_no.match(kc)
+            if m:
+                keymap_data[i][j] = f'MACRO_{m.group(1)}'
+    return keymap_data
+
+
+def _via_to_keymap(via_backup, keyboard_data, keymap_layout):
+    # Check if passed LAYOUT is correct
+    layout_data = keyboard_data['layouts'].get(keymap_layout)
+    if not layout_data:
+        cli.log.error(f'LAYOUT macro {keymap_layout} is not a valid one for keyboard {cli.args.keyboard}!')
+        exit(1)
+
+    layout_data = layout_data['layout']
+    sorting_hat = list()
+    for index, data in enumerate(layout_data):
+        sorting_hat.append([index, data['matrix']])
+
+    sorting_hat.sort(key=lambda k: (k[1][0], k[1][1]))
+
+    pos = 0
+    for row_num in range(0, keyboard_data['matrix_size']['rows']):
+        for col_num in range(0, keyboard_data['matrix_size']['cols']):
+            if pos >= len(sorting_hat) or sorting_hat[pos][1][0] != row_num or sorting_hat[pos][1][1] != col_num:
+                sorting_hat.insert(pos, [None, [row_num, col_num]])
+            else:
+                sorting_hat.append([None, [row_num, col_num]])
+            pos += 1
+
+    keymap_data = list()
+    for layer in via_backup['layers']:
+        pos = 0
+        layer_data = list()
+        for key in layer:
+            if sorting_hat[pos][0] is not None:
+                layer_data.append([sorting_hat[pos][0], key])
+            pos += 1
+        layer_data.sort()
+        layer_data = [kc[1] for kc in layer_data]
+        keymap_data.append(layer_data)
+
+    return keymap_data
+
+
+@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('filename', type=qmk.path.FileType('r'), arg_only=True, help='VIA Backup JSON file')
+@cli.argument('-kb', '--keyboard', type=qmk.keyboard.keyboard_folder, completer=qmk.keyboard.keyboard_completer, arg_only=True, required=True, help='The keyboard\'s name')
+@cli.argument('-km', '--keymap', arg_only=True, default='via2json', help='The keymap\'s name')
+@cli.argument('-l', '--layout', arg_only=True, help='The keymap\'s layout')
+@cli.subcommand('Convert a VIA backup json to keymap.json format.')
+def via2json(cli):
+    """Convert a VIA backup json to keymap.json format.
+
+    This command uses the `qmk.keymap` module to generate a keymap.json from a VIA backup json. The generated keymap is written to stdout, or to a file if -o is provided.
+    """
+    # Find appropriate layout macro
+    keymap_layout = cli.args.layout if cli.args.layout else _find_via_layout_macro(cli.args.keyboard)
+    if not keymap_layout:
+        cli.log.error(f"Couldn't find LAYOUT macro for keyboard {cli.args.keyboard}. Please specify it with the '-l' argument.")
+        exit(1)
+
+    # Load the VIA backup json
+    with cli.args.filename.open('r') as fd:
+        via_backup = json.load(fd)
+
+    # Generate keyboard metadata
+    keyboard_data = info_json(cli.args.keyboard)
+
+    # Get keycode array
+    keymap_data = _via_to_keymap(via_backup, keyboard_data, keymap_layout)
+
+    # Convert macros
+    macro_data = list()
+    if via_backup.get('macros'):
+        macro_data = _convert_macros(via_backup['macros'])
+
+        # Replace VIA macro keys with JSON keymap ones
+        keymap_data = _fix_macro_keys(keymap_data)
+
+    # Generate the keymap.json
+    keymap_json = generate_json(cli.args.keymap, cli.args.keyboard, keymap_layout, keymap_data, macro_data)
+
+    keymap_lines = [json.dumps(keymap_json, cls=KeymapJSONEncoder)]
+    dump_lines(cli.args.output, keymap_lines, cli.args.quiet)
diff --git a/lib/python/qmk/json_encoders.py b/lib/python/qmk/json_encoders.py
index 72e91973a3..40a5c1dea8 100755
--- a/lib/python/qmk/json_encoders.py
+++ b/lib/python/qmk/json_encoders.py
@@ -146,7 +146,13 @@ class KeymapJSONEncoder(QMKJSONEncoder):
                 if key == 'JSON_NEWLINE':
                     layer.append([])
                 else:
-                    layer[-1].append(f'"{key}"')
+                    if isinstance(key, dict):
+                        # We have a macro
+
+                        # TODO: Add proper support for nicely formatting keymap.json macros
+                        layer[-1].append(f'{self.encode(key)}')
+                    else:
+                        layer[-1].append(f'"{key}"')
 
             layer = [f"{self.indent_str*indent_level}{', '.join(row)}" for row in layer]
 
diff --git a/lib/python/qmk/keymap.py b/lib/python/qmk/keymap.py
index 00b5a78a5a..ca5be0959b 100644
--- a/lib/python/qmk/keymap.py
+++ b/lib/python/qmk/keymap.py
@@ -158,7 +158,7 @@ def is_keymap_dir(keymap, c=True, json=True, additional_files=None):
             return True
 
 
-def generate_json(keymap, keyboard, layout, layers):
+def generate_json(keymap, keyboard, layout, layers, macros=None):
     """Returns a `keymap.json` for the specified keyboard, layout, and layers.
 
     Args:
@@ -173,11 +173,16 @@ def generate_json(keymap, keyboard, layout, layers):
 
         layers
             An array of arrays describing the keymap. Each item in the inner array should be a string that is a valid QMK keycode.
+
+        macros
+            A sequence of strings containing macros to implement for this keyboard.
     """
     new_keymap = template_json(keyboard)
     new_keymap['keymap'] = keymap
     new_keymap['layout'] = layout
     new_keymap['layers'] = layers
+    if macros:
+        new_keymap['macros'] = macros
 
     return new_keymap