QMK CLI and JSON keymap support (#6176)

* Script to generate keymap.c from JSON file.

* Support for keymap.json

* Add a warning about the keymap.c getting overwritten.

* Fix keymap generating

* Install the python deps

* Flesh out more of the python environment

* Remove defunct json2keymap

* Style everything with yapf

* Polish up python support

* Hide json keymap.c into the .build dir

* Polish up qmk-compile-json

* Make milc work with positional arguments

* Fix a couple small things

* Fix some errors and make the CLI more understandable

* Make the qmk wrapper more robust

* Add basic QMK Doctor

* Clean up docstrings and flesh them out as needed

* remove unused compile_firmware() function

1 files changed, 100 insertions, 0 deletions

diff --git a/lib/python/qmk/keymap.py b/lib/python/qmk/keymap.py
new file mode 100644
index 0000000000..6eccab788a
--- /dev/null
+++ b/lib/python/qmk/keymap.py
@@ -0,0 +1,100 @@
+"""Functions that help you work with QMK keymaps.
+"""
+import json
+import logging
+import os
+from traceback import format_exc
+
+import qmk.path
+from qmk.errors import NoSuchKeyboardError
+
+# The `keymap.c` template to use when a keyboard doesn't have its own
+DEFAULT_KEYMAP_C = """#include QMK_KEYBOARD_H
+
+/* THIS FILE WAS GENERATED!
+ *
+ * This file was generated by qmk-compile-json. You may or may not want to
+ * edit it directly.
+ */
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+__KEYMAP_GOES_HERE__
+};
+"""
+
+
+def template(keyboard):
+    """Returns the `keymap.c` template for a keyboard.
+
+    If a template exists in `keyboards/<keyboard>/templates/keymap.c` that
+    text will be used instead of `DEFAULT_KEYMAP_C`.
+
+    Args:
+        keyboard
+            The keyboard to return a template for.
+    """
+    template_name = 'keyboards/%s/templates/keymap.c' % keyboard
+
+    if os.path.exists(template_name):
+        with open(template_name, 'r') as fd:
+            return fd.read()
+
+    return DEFAULT_KEYMAP_C
+
+
+def generate(keyboard, layout, layers):
+    """Returns a keymap.c for the specified keyboard, layout, and layers.
+
+    Args:
+        keyboard
+            The name of the keyboard
+
+        layout
+            The LAYOUT macro this keymap uses.
+
+        layers
+            An array of arrays describing the keymap. Each item in the inner array should be a string that is a valid QMK keycode.
+    """
+    layer_txt = []
+    for layer_num, layer in enumerate(layers):
+        if layer_num != 0:
+            layer_txt[-1] = layer_txt[-1] + ','
+        layer_keys = ', '.join(layer)
+        layer_txt.append('\t[%s] = %s(%s)' % (layer_num, layout, layer_keys))
+
+    keymap = '\n'.join(layer_txt)
+    keymap_c = template(keyboard, keymap)
+
+    return keymap_c.replace('__KEYMAP_GOES_HERE__', keymap)
+
+
+def write(keyboard, keymap, layout, layers):
+    """Generate the `keymap.c` and write it to disk.
+
+    Returns the filename written to.
+
+    Args:
+        keyboard
+            The name of the keyboard
+
+        keymap
+            The name of the keymap
+
+        layout
+            The LAYOUT macro this keymap uses.
+
+        layers
+            An array of arrays describing the keymap. Each item in the inner array should be a string that is a valid QMK keycode.
+    """
+    keymap_c = generate(keyboard, layout, layers)
+    keymap_path = qmk.path.keymap(keyboard)
+    keymap_dir = os.path.join(keymap_path, keymap)
+    keymap_file = os.path.join(keymap_dir, 'keymap.c')
+
+    if not os.path.exists(keymap_dir):
+        os.makedirs(keymap_dir)
+
+    with open(keymap_file, 'w') as keymap_fd:
+        keymap_fd.write(keymap_c)
+
+    return keymap_file