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Coder Layer

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L2

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ALSO:
DVORAK

Pictured: Some other guy called Dvorak

algernon/ergodox-layout

# Makefile

KEYLOGGER_ENABLE = yes
AUTOLOG_ENABLE ?= yes

...

ifndef QUANTUM_DIR
  include ../../../../Makefile
endif

# keymap.c

#if KEYLOGGER_ENABLE
# ifdef AUTOLOG_ENABLE
bool log_enable = true;
# else
bool log_enable = false;
# endif
#endif

# keymap.c

bool process_record_user(
  uint16_t keycode, 
  keyrecord_t *record
) {
#if KEYLOGGER_ENABLE
  
  # do the actual stuff here

#endif
  return true;
}

# keymap.c

if (log_enable) {
  uint8_t layer = biton32(layer_state);

  if (layer == BASE) {
    uprintf(
      "KL: col=%02d, row=%02d, pressed=%d, layer=%s\n",
      record->event.key.row,
      record->event.key.col,
      record->event.pressed,
      "QWERTY"
    );
  }
}

$ sudo hid_listen
[sudo] password for naps62:
Waiting for device:
Listening:
KL: col=01, row=02, pressed=0, layer=QWERTY
KL: col=11, row=02, pressed=0, layer=QWERTY
KL: col=02, row=02, pressed=0, layer=QWERTY
KL: col=09, row=02, pressed=1, layer=QWERTY
KL: col=03, row=02, pressed=0, layer=QWERTY
KL: col=09, row=02, pressed=0, layer=QWERTY
KL: col=00, row=02, pressed=1, layer=QWERTY
KL: col=03, row=02, pressed=1, layer=QWERTY
KL: col=03, row=02, pressed=0, layer=QWERTY
...

algernon's heatmap:

keyboard-layout-editor.com