Add CLI command for flashing a keyboard

A new CLI subcommand was added, flash, which behaves very similar to the already present compile CLI comamnd, but with the added ability to target a bootloader. The command is used like so: qmk flash [-h] [-b] [-kb KEYBOARD] [-km KEYMAP] [-bl BOOTLOADER] [filename].

A -kb <keyboard> and -km <keymap> is expected, or a configurator export JSON filename. A bootloader can be specified using -bl <target>, and if left unspecified, the target is assumed to be :flash. -bl can be used to list the available bootloaders.

If -km <keymap> is provided, but no -kb <keyboard>, then a message is printed suggesting the user to run qmk list_keyboards.

lib/python/qmk/commands.py

@@ -0,0 +1,57 @@
+"""Functions that build make commands
+"""
+import json
+import qmk.keymap
+
+def create_make_command(keyboard, keymap, target=None):
+    """Create a make compile command
+
+    Args:
+        keyboard
+            The path of the keyboard, for example 'plank'
+
+        keymap
+            The name of the keymap, for example 'algernon'
+
+        target
+            Usually a bootloader.
+
+    Returns:
+        A command that can be run to make the specified keyboard and keymap
+    """
+    if target is None:
+        return ['make', ':'.join((keyboard, keymap))]
+    return ['make', ':'.join((keyboard, keymap, target))]
+
+def parse_configurator_json(configurator_filename):
+    """Open and parse a configurator json export
+    """
+    file = open(configurator_filename)
+    user_keymap = json.load(file)
+    file.close()
+    return user_keymap
+
+def compile_configurator_json(configurator_filename, bootloader=None):
+    """Convert a configurator export JSON file into a C file
+
+    Args:
+        configurator_filename
+            The configurator JSON export file
+
+        bootloader
+            A bootloader to flash
+
+    Returns:
+        A command to run to compile and flash the C file.
+    """
+    # Parse the configurator json
+    user_keymap = parse_configurator_json(configurator_filename)
+
+    # Write the keymap C file
+    qmk.keymap.write(user_keymap['keyboard'], user_keymap['keymap'], user_keymap['layout'], user_keymap['layers'])
+
+    # Return a command that can be run to make the keymap and flash if given
+    if bootloader is None:
+        return create_make_command(user_keymap['keyboard'], user_keymap['keymap'])
+    return create_make_command(user_keymap['keyboard'], user_keymap['keymap'], bootloader)
+