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keymap.py
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keymap.py
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from typing import List, Tuple
def load_keymap():
'''returns {
'KEY_U': ['press u', 'shift U'],
'KEY_UP': ['press \\x1b[A'],
'KEY_V': ['press v', 'shift V'],
'KEY_W': ['press w', 'shift W'],
}
'''
keymap = {
'_toggle': [],
'_track': []
}
with open('./keymap') as f:
for line in f:
line = line.rstrip()
if line.lstrip() == line:
keycode = line[4:] if line.startswith('KEY_') else line
keymap[keycode] = []
else:
action = line.lstrip()
if action == 'track':
keymap['_track'].append(keycode)
elif action == 'toggle':
keymap['_toggle'].append(keycode)
else:
on, then = action.split()
keymap[keycode].append((on, then))
to_delete = []
for k, v in keymap.items():
if not v:
to_delete.append(k)
for k in to_delete:
del keymap[k]
return keymap
keymap = load_keymap()
def p(indent=None, *a):
if indent is None:
print()
return
if indent == 0:
print(*a)
else:
print(' '*(4*indent-1), *a)
def trackvar(k):
return f'_is_{k.lower()}_down'
def togglevar(k):
return f'{k.lower()}_state'
mods = {
'shift': 'leftshift rightshift',
'meta': 'leftmeta rightmeta',
'ctrl': 'capslock leftctrl rightctrl',
'alt': 'leftalt rightalt'
}
def kbstate(n):
return {
'shift': 'is_shift()',
'meta': 'is_meta()',
'ctrl': 'is_ctrl()',
'alt': 'is_alt()',
'numlock': 'numlock_state',
'scrolllock': 'scrolllock_state'
}[n]
def emit(indent, step):
def esc(s):
if s == '\xff':
return "'\\xff'"
s = repr(s)[1:-1]
if s == "'":
s = "\\'"
return f"'{s}'"
step = step.encode('utf-8').decode('unicode_escape')
if len(step) == 1:
p(indent, f"out.push_back({esc(step)});")
else:
p(indent, f"out.insert(out.end(), {{{', '.join(map(esc, step))}}});")
#for s in step:
# s = repr(s)[1:-1]
# if s == "'":
# s = "\\'"
# p(indent, f"out.push_back('{s}');")
p(0, '''
/* autogenerated by keymap.py - do not edit */
#pragma once
#include <deque>
#include <linux/input.h>
class KeycodeTranslation {''')
for k in keymap['_track']:
p(1, f'int {trackvar(k)};')
for k in keymap['_toggle']:
p(1, f'int {togglevar(k)};')
p()
p(0, 'public:')
for k, v in mods.items():
p(1, f'bool is_{k}() {{')
p(2, f'return {" || ".join(trackvar(vv.upper()) for vv in v.split())};')
p(1, '}')
p()
p(0, 'private:')
p(1, 'void _translate_press(int keycode, std::deque<char> & out) {')
p(2, 'switch (keycode) {')
for i, (k, v) in enumerate(keymap.items()):
if k == '_toggle' or k == '_track':
continue
p(3, f'case KEY_{k}:')
press = None
for action, step in v:
if action == 'press':
press = step
continue
p(4, f'if ({kbstate(action)}) {{')
emit(5, step)
p(4, '}')
if press is not None and len(v) > 1:
p(4, 'else {')
emit(5, press)
p(4, '}')
elif press is not None:
emit(4, press)
p(4, 'break;')
p(2, '}')
p(1, '}')
p()
p(0, 'public:')
p(1, 'void press(int keycode, std::deque<char> & out) {')
for k in keymap['_track']:
p(2, f'if (keycode == KEY_{k})'.ljust(30), f'{trackvar(k)} = 1;')
for k in keymap['_toggle']:
p(2, f'if (keycode == KEY_{k})'.ljust(30), f'{togglevar(k)} = !{togglevar(k)};')
p(2, '_translate_press(keycode, out);')
p(1, '}')
p()
p(1, 'void release(int keycode, std::deque<char> & out __attribute__((unused))) {')
for k in keymap['_track']:
p(2, f'if (keycode == KEY_{k})'.ljust(30), f'{trackvar(k)} = 0;')
p(1, '}')
p(0, '};')