Add support for tab completion (#12411)

* Add support for tab completion

* make flake8 happy

* Add documentation

16 files changed, 50 insertions, 31 deletions

diff --git a/lib/python/qmk/cli/__init__.py b/lib/python/qmk/cli/__init__.py
index 1349e68a9b..f7df908119 100644
--- a/lib/python/qmk/cli/__init__.py
+++ b/lib/python/qmk/cli/__init__.py
@@ -4,7 +4,7 @@ We list each subcommand here explicitly because all the reliable ways of searchi
 """
 import sys
 
-from milc import cli
+from milc import cli, __VERSION__
 
 from . import c2json
 from . import cformat
@@ -47,5 +47,15 @@ from . import pytest
 # void: 3.9
 
 if sys.version_info[0] != 3 or sys.version_info[1] < 7:
-    cli.log.error('Your Python is too old! Please upgrade to Python 3.7 or later.')
+    print('Error: Your Python is too old! Please upgrade to Python 3.7 or later.')
+    exit(127)
+
+milc_version = __VERSION__.split('.')
+
+if int(milc_version[0]) < 2 and int(milc_version[1]) < 3:
+    from pathlib import Path
+
+    requirements = Path('requirements.txt').resolve()
+
+    print(f'Your MILC library is too old! Please upgrade: python3 -m pip install -U -r {str(requirements)}')
     exit(127)
diff --git a/lib/python/qmk/cli/c2json.py b/lib/python/qmk/cli/c2json.py
index 1fa833b647..e66b0a1b58 100644
--- a/lib/python/qmk/cli/c2json.py
+++ b/lib/python/qmk/cli/c2json.py
@@ -2,20 +2,21 @@
 """
 import json
 
+from argcomplete.completers import FilesCompleter
 from milc import cli
 
 import qmk.keymap
 import qmk.path
 from qmk.json_encoders import InfoJSONEncoder
-from qmk.keyboard import keyboard_folder
+from qmk.keyboard import keyboard_completer, keyboard_folder
 
 
 @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, type=keyboard_folder, required=True, help='The keyboard\'s name')
+@cli.argument('-kb', '--keyboard', arg_only=True, type=keyboard_folder, completer=keyboard_completer, 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.argument('filename', arg_only=True, completer=FilesCompleter('.c'), 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.
diff --git a/lib/python/qmk/cli/cformat.py b/lib/python/qmk/cli/cformat.py
index c7e93b2ab6..d0d3b3b0a3 100644
--- a/lib/python/qmk/cli/cformat.py
+++ b/lib/python/qmk/cli/cformat.py
@@ -3,6 +3,7 @@
 import subprocess
 from shutil import which
 
+from argcomplete.completers import FilesCompleter
 from milc import cli
 
 from qmk.path import normpath
@@ -33,7 +34,7 @@ def cformat_run(files, all_files):
 
 @cli.argument('-a', '--all-files', arg_only=True, action='store_true', help='Format all core files.')
 @cli.argument('-b', '--base-branch', default='origin/master', help='Branch to compare to diffs to.')
-@cli.argument('files', nargs='*', arg_only=True, help='Filename(s) to format.')
+@cli.argument('files', nargs='*', arg_only=True, completer=FilesCompleter('.c'), help='Filename(s) to format.')
 @cli.subcommand("Format C code according to QMK's style.", hidden=False if cli.config.user.developer else True)
 def cformat(cli):
     """Format C code according to QMK's style.
diff --git a/lib/python/qmk/cli/compile.py b/lib/python/qmk/cli/compile.py
index 5793e98928..23ca4e00a6 100755
--- a/lib/python/qmk/cli/compile.py
+++ b/lib/python/qmk/cli/compile.py
@@ -2,17 +2,19 @@
 
 You can compile a keymap already in the repo or using a QMK Configurator export.
 """
+from argcomplete.completers import FilesCompleter
 from milc import cli
 
 import qmk.path
 from qmk.decorators import automagic_keyboard, automagic_keymap
 from qmk.commands import compile_configurator_json, create_make_command, parse_configurator_json
-from qmk.keyboard import keyboard_folder
+from qmk.keyboard import keyboard_completer, keyboard_folder
+from qmk.keymap import keymap_completer
 
 
-@cli.argument('filename', nargs='?', arg_only=True, type=qmk.path.FileType('r'), help='The configurator export to compile')
-@cli.argument('-kb', '--keyboard', type=keyboard_folder, help='The keyboard to build a firmware for. Ignored when a configurator export is supplied.')
-@cli.argument('-km', '--keymap', help='The keymap to build a firmware for. Ignored when a configurator export is supplied.')
+@cli.argument('filename', nargs='?', arg_only=True, type=qmk.path.FileType('r'), completer=FilesCompleter('.json'), help='The configurator export to compile')
+@cli.argument('-kb', '--keyboard', type=keyboard_folder, completer=keyboard_completer, help='The keyboard to build a firmware for. Ignored when a configurator export is supplied.')
+@cli.argument('-km', '--keymap', completer=keymap_completer, help='The keymap to build a firmware for. Ignored when a configurator export is supplied.')
 @cli.argument('-n', '--dry-run', arg_only=True, action='store_true', help="Don't actually build, just show the make command to be run.")
 @cli.argument('-j', '--parallel', type=int, default=1, help="Set the number of parallel make jobs to run.")
 @cli.argument('-e', '--env', arg_only=True, action='append', default=[], help="Set a variable to be passed to make. May be passed multiple times.")
diff --git a/lib/python/qmk/cli/flash.py b/lib/python/qmk/cli/flash.py
index c9273c3f98..1b67840616 100644
--- a/lib/python/qmk/cli/flash.py
+++ b/lib/python/qmk/cli/flash.py
@@ -4,12 +4,13 @@ You can compile a keymap already in the repo or using a QMK Configurator export.
 A bootloader must be specified.
 """
 
+from argcomplete.completers import FilesCompleter
 from milc import cli
 
 import qmk.path
 from qmk.decorators import automagic_keyboard, automagic_keymap
 from qmk.commands import compile_configurator_json, create_make_command, parse_configurator_json
-from qmk.keyboard import keyboard_folder
+from qmk.keyboard import keyboard_completer, keyboard_folder
 
 
 def print_bootloader_help():
@@ -30,11 +31,11 @@ def print_bootloader_help():
     cli.echo('For more info, visit https://docs.qmk.fm/#/flashing')
 
 
-@cli.argument('filename', nargs='?', arg_only=True, type=qmk.path.FileType('r'), help='The configurator export JSON to compile.')
+@cli.argument('filename', nargs='?', arg_only=True, type=qmk.path.FileType('r'), completer=FilesCompleter('.json'), help='The configurator export JSON to compile.')
 @cli.argument('-b', '--bootloaders', action='store_true', help='List the available bootloaders.')
 @cli.argument('-bl', '--bootloader', default='flash', help='The flash command, corresponding to qmk\'s make options of bootloaders.')
 @cli.argument('-km', '--keymap', help='The keymap to build a firmware for. Use this if you dont have a configurator file. Ignored when a configurator file is supplied.')
-@cli.argument('-kb', '--keyboard', type=keyboard_folder, help='The keyboard to build a firmware for. Use this if you dont have a configurator file. Ignored when a configurator file is supplied.')
+@cli.argument('-kb', '--keyboard', type=keyboard_folder, completer=keyboard_completer, help='The keyboard to build a firmware for. Use this if you dont have a configurator file. Ignored when a configurator file is supplied.')
 @cli.argument('-n', '--dry-run', arg_only=True, action='store_true', help="Don't actually build, just show the make command to be run.")
 @cli.argument('-j', '--parallel', type=int, default=1, help="Set the number of parallel make jobs to run.")
 @cli.argument('-e', '--env', arg_only=True, action='append', default=[], help="Set a variable to be passed to make. May be passed multiple times.")
diff --git a/lib/python/qmk/cli/generate/config_h.py b/lib/python/qmk/cli/generate/config_h.py
index ccea6d7a05..54cd5b96a8 100755
--- a/lib/python/qmk/cli/generate/config_h.py
+++ b/lib/python/qmk/cli/generate/config_h.py
@@ -8,7 +8,7 @@ from milc import cli
 from qmk.decorators import automagic_keyboard, automagic_keymap
 from qmk.info import info_json
 from qmk.json_schema import json_load
-from qmk.keyboard import keyboard_folder
+from qmk.keyboard import keyboard_completer, keyboard_folder
 from qmk.path import is_keyboard, normpath
 
 
@@ -75,7 +75,7 @@ def matrix_pins(matrix_pins):
 
 @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, help='Keyboard to generate config.h for.')
+@cli.argument('-kb', '--keyboard', type=keyboard_folder, completer=keyboard_completer, help='Keyboard to generate config.h for.')
 @cli.subcommand('Used by the make system to generate info_config.h from info.json', hidden=True)
 @automagic_keyboard
 @automagic_keymap
diff --git a/lib/python/qmk/cli/generate/dfu_header.py b/lib/python/qmk/cli/generate/dfu_header.py
index 6f958b3a3d..211ed9991a 100644
--- a/lib/python/qmk/cli/generate/dfu_header.py
+++ b/lib/python/qmk/cli/generate/dfu_header.py
@@ -6,11 +6,12 @@ from milc import cli
 from qmk.decorators import automagic_keyboard
 from qmk.info import info_json
 from qmk.path import is_keyboard, normpath
+from qmk.keyboard import keyboard_completer
 
 
 @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', help='Keyboard to generate LUFA Keyboard.h for.')
+@cli.argument('-kb', '--keyboard', completer=keyboard_completer, help='Keyboard to generate LUFA Keyboard.h for.')
 @cli.subcommand('Used by the make system to generate LUFA Keyboard.h from info.json', hidden=True)
 @automagic_keyboard
 def generate_dfu_header(cli):
diff --git a/lib/python/qmk/cli/generate/info_json.py b/lib/python/qmk/cli/generate/info_json.py
index 1af7f04392..8931b68b6f 100755
--- a/lib/python/qmk/cli/generate/info_json.py
+++ b/lib/python/qmk/cli/generate/info_json.py
@@ -11,7 +11,7 @@ from qmk.decorators import automagic_keyboard, automagic_keymap
 from qmk.info import info_json
 from qmk.json_encoders import InfoJSONEncoder
 from qmk.json_schema import load_jsonschema
-from qmk.keyboard import keyboard_folder
+from qmk.keyboard import keyboard_completer, keyboard_folder
 from qmk.path import is_keyboard
 
 
@@ -41,7 +41,7 @@ def strip_info_json(kb_info_json):
     return validator(kb_info_json)
 
 
-@cli.argument('-kb', '--keyboard', type=keyboard_folder, help='Keyboard to show info for.')
+@cli.argument('-kb', '--keyboard', type=keyboard_folder, completer=keyboard_completer, help='Keyboard to show info for.')
 @cli.argument('-km', '--keymap', help='Show the layers for a JSON keymap too.')
 @cli.subcommand('Generate an info.json file for a keyboard.', hidden=False if cli.config.user.developer else True)
 @automagic_keyboard
diff --git a/lib/python/qmk/cli/generate/layouts.py b/lib/python/qmk/cli/generate/layouts.py
index 7b4394291f..ad6946d6cf 100755
--- a/lib/python/qmk/cli/generate/layouts.py
+++ b/lib/python/qmk/cli/generate/layouts.py
@@ -5,7 +5,7 @@ from milc import cli
 from qmk.constants import COL_LETTERS, ROW_LETTERS
 from qmk.decorators import automagic_keyboard, automagic_keymap
 from qmk.info import info_json
-from qmk.keyboard import keyboard_folder
+from qmk.keyboard import keyboard_completer, keyboard_folder
 from qmk.path import is_keyboard, normpath
 
 usb_properties = {
@@ -17,7 +17,7 @@ usb_properties = {
 
 @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, help='Keyboard to generate config.h for.')
+@cli.argument('-kb', '--keyboard', type=keyboard_folder, completer=keyboard_completer, help='Keyboard to generate config.h for.')
 @cli.subcommand('Used by the make system to generate layouts.h from info.json', hidden=True)
 @automagic_keyboard
 @automagic_keymap
diff --git a/lib/python/qmk/cli/generate/rules_mk.py b/lib/python/qmk/cli/generate/rules_mk.py
index 91759d26c6..41c94e16b5 100755
--- a/lib/python/qmk/cli/generate/rules_mk.py
+++ b/lib/python/qmk/cli/generate/rules_mk.py
@@ -8,7 +8,7 @@ from milc import cli
 from qmk.decorators import automagic_keyboard, automagic_keymap
 from qmk.info import info_json
 from qmk.json_schema import json_load
-from qmk.keyboard import keyboard_folder
+from qmk.keyboard import keyboard_completer, keyboard_folder
 from qmk.path import is_keyboard, normpath
 
 
@@ -39,7 +39,7 @@ def process_mapping_rule(kb_info_json, rules_key, info_dict):
 @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('-e', '--escape', arg_only=True, action='store_true', help="Escape spaces in quiet mode")
-@cli.argument('-kb', '--keyboard', type=keyboard_folder, help='Keyboard to generate config.h for.')
+@cli.argument('-kb', '--keyboard', type=keyboard_folder, completer=keyboard_completer, help='Keyboard to generate config.h for.')
 @cli.subcommand('Used by the make system to generate info_config.h from info.json', hidden=True)
 @automagic_keyboard
 @automagic_keymap
diff --git a/lib/python/qmk/cli/info.py b/lib/python/qmk/cli/info.py
index aac507c1a5..572b305cac 100755
--- a/lib/python/qmk/cli/info.py
+++ b/lib/python/qmk/cli/info.py
@@ -10,7 +10,7 @@ from milc import cli
 from qmk.json_encoders import InfoJSONEncoder
 from qmk.constants import COL_LETTERS, ROW_LETTERS
 from qmk.decorators import automagic_keyboard, automagic_keymap
-from qmk.keyboard import keyboard_folder, render_layouts, render_layout
+from qmk.keyboard import keyboard_completer, keyboard_folder, render_layouts, render_layout
 from qmk.keymap import locate_keymap
 from qmk.info import info_json
 from qmk.path import is_keyboard
@@ -124,7 +124,7 @@ def print_text_output(kb_info_json):
         show_keymap(kb_info_json, False)
 
 
-@cli.argument('-kb', '--keyboard', type=keyboard_folder, help='Keyboard to show info for.')
+@cli.argument('-kb', '--keyboard', type=keyboard_folder, completer=keyboard_completer, help='Keyboard to show info for.')
 @cli.argument('-km', '--keymap', help='Show the layers for a JSON keymap too.')
 @cli.argument('-l', '--layouts', action='store_true', help='Render the layouts.')
 @cli.argument('-m', '--matrix', action='store_true', help='Render the layouts with matrix information.')
diff --git a/lib/python/qmk/cli/json2c.py b/lib/python/qmk/cli/json2c.py
index 5a2fb96c78..a90578c021 100755
--- a/lib/python/qmk/cli/json2c.py
+++ b/lib/python/qmk/cli/json2c.py
@@ -2,6 +2,7 @@
 """
 import json
 
+from argcomplete.completers import FilesCompleter
 from milc import cli
 
 import qmk.keymap
@@ -10,7 +11,7 @@ import qmk.path
 
 @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='Configurator JSON file')
+@cli.argument('filename', type=qmk.path.FileType('r'), arg_only=True, completer=FilesCompleter('.json'), help='Configurator JSON file')
 @cli.subcommand('Creates a keymap.c from a QMK Configurator export.')
 def json2c(cli):
     """Generate a keymap.c from a configurator export.
diff --git a/lib/python/qmk/cli/kle2json.py b/lib/python/qmk/cli/kle2json.py
index 91499c9af3..acb75ef4fd 100755
--- a/lib/python/qmk/cli/kle2json.py
+++ b/lib/python/qmk/cli/kle2json.py
@@ -4,6 +4,7 @@ import json
 import os
 from pathlib import Path
 
+from argcomplete.completers import FilesCompleter
 from milc import cli
 from kle2xy import KLE2xy
 
@@ -11,7 +12,7 @@ from qmk.converter import kle2qmk
 from qmk.json_encoders import InfoJSONEncoder
 
 
-@cli.argument('filename', help='The KLE raw txt to convert')
+@cli.argument('filename', completer=FilesCompleter('.json'), help='The KLE raw txt to convert')
 @cli.argument('-f', '--force', action='store_true', help='Flag to overwrite current info.json')
 @cli.subcommand('Convert a KLE layout to a Configurator JSON', hidden=False if cli.config.user.developer else True)
 def kle2json(cli):
diff --git a/lib/python/qmk/cli/lint.py b/lib/python/qmk/cli/lint.py
index 74467021e0..a164dba632 100644
--- a/lib/python/qmk/cli/lint.py
+++ b/lib/python/qmk/cli/lint.py
@@ -4,12 +4,13 @@ from milc import cli
 
 from qmk.decorators import automagic_keyboard, automagic_keymap
 from qmk.info import info_json
+from qmk.keyboard import keyboard_completer
 from qmk.keymap import locate_keymap
 from qmk.path import is_keyboard, keyboard
 
 
 @cli.argument('--strict', action='store_true', help='Treat warnings as errors.')
-@cli.argument('-kb', '--keyboard', help='The keyboard to check.')
+@cli.argument('-kb', '--keyboard', completer=keyboard_completer, help='The keyboard to check.')
 @cli.argument('-km', '--keymap', help='The keymap to check.')
 @cli.subcommand('Check keyboard and keymap for common mistakes.')
 @automagic_keyboard
diff --git a/lib/python/qmk/cli/list/keymaps.py b/lib/python/qmk/cli/list/keymaps.py
index 7c0ad43997..d79ab75b58 100644
--- a/lib/python/qmk/cli/list/keymaps.py
+++ b/lib/python/qmk/cli/list/keymaps.py
@@ -4,10 +4,10 @@ from milc import cli
 
 import qmk.keymap
 from qmk.decorators import automagic_keyboard
-from qmk.keyboard import keyboard_folder
+from qmk.keyboard import keyboard_completer, keyboard_folder
 
 
-@cli.argument("-kb", "--keyboard", type=keyboard_folder, help="Specify keyboard name. Example: 1upkeyboards/1up60hse")
+@cli.argument("-kb", "--keyboard", type=keyboard_folder, completer=keyboard_completer, help="Specify keyboard name. Example: 1upkeyboards/1up60hse")
 @cli.subcommand("List the keymaps for a specific keyboard")
 @automagic_keyboard
 def list_keymaps(cli):
diff --git a/lib/python/qmk/cli/new/keymap.py b/lib/python/qmk/cli/new/keymap.py
index ea98a287c1..60cb743cb6 100755
--- a/lib/python/qmk/cli/new/keymap.py
+++ b/lib/python/qmk/cli/new/keymap.py
@@ -5,11 +5,11 @@ from pathlib import Path
 
 import qmk.path
 from qmk.decorators import automagic_keyboard, automagic_keymap
-from qmk.keyboard import keyboard_folder
+from qmk.keyboard import keyboard_completer, keyboard_folder
 from milc import cli
 
 
-@cli.argument('-kb', '--keyboard', type=keyboard_folder, help='Specify keyboard name. Example: 1upkeyboards/1up60hse')
+@cli.argument('-kb', '--keyboard', type=keyboard_folder, completer=keyboard_completer, help='Specify keyboard name. Example: 1upkeyboards/1up60hse')
 @cli.argument('-km', '--keymap', help='Specify the name for the new keymap directory')
 @cli.subcommand('Creates a new keymap for the keyboard of your choosing')
 @automagic_keyboard