#+Title: Samuel's Literate QMK Config
#+PROPERTY: header-args :tangle ~/qmk_firmware/keyboards/planck/keymaps/samuel/keymap.c

This is my qmk firmware for my keyboard. I grew tired of organizing the keycode
array in plain text so I made it a literate .org file. I've never done this
before, so bear with me.

* Layers

  #+BEGIN_COMMENT
  #+NAME: empty-layer
  | <6>    | <6>    | <6>    | <6>    | <6>    | <6>    | <6>    | <6>    | <6>    | <6>    | <6>    | <6>    |
  |--------+--------+--------+--------+--------+--------+--------+--------+--------+--------+--------+--------|
  | -      | -      | -      | -      | -      | -      | -      | -      | -      | -      | -      | -      |
  | -      | -      | -      | -      | -      | -      | -      | -      | -      | -      | -      | -      |
  | -      | -      | -      | -      | -      | -      | -      | -      | -      | -      | -      | -      |
  | -      | -      | -      | -      | -      | -      | -      | -      | -      | -      | -      | -      |
  |--------+--------+--------+--------+--------+--------+--------+--------+--------+--------+--------+--------|
  #+END_COMMENT

  This is my "pretty" org mode organized table for my main dvorak layer. If you
  don't use org mode, it won't be that exciting, but if you enjoy working in org
  mode, you can edit this table directly, and this file is tangled to the actual
  keymap. No more organizing spaces or converting to and from comments.

  #+NAME: home-layer
  |--------+--------+------+------+-----+-----+------+-----+------+-------+--------+--------|
  | T_LRSE | QUOT   | COMM | DOT  | P   | Y   | F    | G   | C    | R     | L      | T_RRSE |
  | T_LSFT | A      | O    | E    | U   | I   | D    | H   | T    | N     | S      | T_RSFT |
  | T_LCTL | SCLN   | Q    | J    | K   | X   | B    | M   | W    | V     | Z      | T_RCTL |
  | T_LGUI | T_LALT | UP   | DOWN | SPC | EQL | GRAVE | SPC | LEFT | RIGHT | T_RALT | T_RGUI |
  |--------+--------+------+------+-----+-----+------+-----+------+-------+--------+--------|

  Tap keys. Used only with the "T_" keys above.

  #+NAME: tap-layer
  |----------+------+---+---+---+---+---+---+---+---+------+----------|
  | DEL      | -    | - | - | - | - | - | - | - | - | -    | BSPC     |
  | TAB      | -    | - | - | - | - | - | - | - | - | -    | ENTER    |
  | LBRACKET | -    | - | - | - | - | - | - | - | - | -    | RBRACKET |
  | SLASH    | LPRN | - | - | - | - | - | - | - | - | RPRN | MINS     |
  |----------+------+---+---+---+---+---+---+---+---+------+----------|

  #+NAME: hold-layer
  |------+------+---+---+---+---+---+---+---+---+------+------|
  | RISE | -    | - | - | - | - | - | - | - | - | -    | RISE |
  | LSFT | -    | - | - | - | - | - | - | - | - | -    | RSFT |
  | LCTL | -    | - | - | - | - | - | - | - | - | -    | RCTL |
  | LGUI | LALT | - | - | - | - | - | - | - | - | RALT | RGUI |
  |------+------+---+---+---+---+---+---+---+---+------+------|

  I tried to keep my layout bare bones, just what would be available on a normal
  keyboard, minus some keys I never used. This one secondary layer should cover a
  majority of the keys not found on the home layer. The bottom left copies a normal
  keyboards symbols from shifted numbers, and the rest is placed where convenient,
  with some considerations for one handed use, hence the shortcuts in the top
  left.

  #+NAME: secondary-layer
  |--------+--------+--------+--------+--------+------+--------+-----+--------+--------+-------+--------|
  | --     | EZUNDO | EZCOPY | EZCUT  | EZPSTE | INS  | ASTR   |   7 |      8 |      9 | --    | --     |
  | EZSHFT | ESC    | CAPS   | PGUP   | PGDN   | HOME | AMPR   |   4 |      5 |      6 | 0     | EZSHFT |
  | EZCTRL | EXLM   | AT     | HASH   | DLR    | PERC | CIRC   |   1 |      2 |      3 | COM   | EZCTRL |
  | EZGUI  | EZALT  | EZUP   | EZDOWN | SPC    | PIPE | BSLASH | END | EZLEFT | EZRGHT | EZALT | EZGUI  |
  |--------+--------+--------+--------+--------+------+--------+-----+--------+--------+-------+--------|

  Basic command layer for one-shot macros and function keys.

  #+NAME: command-layer
  |----+-----+-----+-----+-----+--------+--------+-----+-----+-----+-----+----|
  | -- | F1  | F2  | F3  | F4  | F5     | F6     | F7  | F8  | F9  | F10 | -- |
  | -- | F11 | F12 | F13 | F14 | F15    | F16    | F17 | F18 | F19 | F20 | -- |
  | -- | F21 | F22 | F23 | F24 | QWERTY | DVORAK | --  | --  | --  | --  | -- |
  | -- | --  | --  | --  | --  | --     | --     | --  | --  | --  | --  | -- |
  |----+-----+-----+-----+-----+--------+--------+-----+-----+-----+-----+----|

  This qwerty layout is just so normal people can try out the board. Tap keys
  would need to be customized I think, more on that later. I also put another
  dvorak key here because I have nightmares of getting trapped in this forsaken
  layout.

  #+NAME: qwerty-layer
  |--------+--------+----+------+-----+-----+------+-----+------+-------+--------+--------|
  | T_LRSE | Q      | W  | E    | R   | T   | Y    | U   | I    | O     | P      | T_RRSE |
  | T_LSFT | A      | S  | D    | F   | G   | H    | J   | K    | L     | SCLN   | T_RSFT |
  | T_LCTL | Z      | X  | C    | V   | B   | N    | M   | COMM | DOT   | QUOT   | T_RCTL |
  | T_LGUI | T_LALT | UP | DOWN | SPC | EQL | GRAVE | SPC | LEFT | RIGHT | T_RALT | DVORAK |
  |--------+--------+----+------+-----+-----+------+-----+------+-------+--------+--------|


* Keymap Conversion in Python

  This python can convert that table into the array needed for the keymap file. It
  simply prepends every key with "KC_". I used to use a dictionary to convert some
  keys from the table into qmk keycodes, but the double convertion was
  unneccessary so I just prepended all my macros with KC and moved all the
  implementation to the `process-user-input` function.

  #+NAME:layer-to-array
  #+BEGIN_SRC python :var keys=secondary-layer :tangle no
  row = 0
  results = ''
  while row < len(keys):
    key = 0
    while key < len(keys[row]):
      keyName = str(keys[row][key])
      if keyName == '--':
        keyName = 'TRANSPARENT'
      results += 'KC_' + keyName
      if key != 11:
        results += ', '
      key+=1
    if row != 3:
      results += ','
    results += '\n'
    row+=1
  return results
  #+END_SRC

  Tap keys are technically defined in the mod_lift function. but this is will
  implement that function from the org table.

  #+NAME:define-tap-key
  #+BEGIN_SRC python :var row=3 :var col=1 :var id=0 :var tapkeys=tap-layer :var holdkeys=hold-layer :tangle no
  def getKey(keys, istapkey):
    if istapkey == True:
      keyName = str(keys[row][col])
    else:
      keyName = str(keys[row][col])
    if keyName == '--':
      keyName = 'TRANSPARENT'
    if istapkey == False:
      return 'KC_T_' + keyName, 'KC_' + keyName
    else:
      return 'KC_' + keyName
  tapKeyName = getKey(tapkeys, True)
  holdKeyMacro, holdKeyName = getKey(holdkeys, False)
  return """case %s:
  if (record->event.pressed) {
     mod_press(%s, %s, %i);
  } else {
     mod_lift(%s, %s, %i);
  }
  return false;
  break;""" % (holdKeyMacro, tapKeyName, holdKeyName, id, tapKeyName, holdKeyName, id)

  #+END_SRC


* keymap.c

  Now that we laid out our layout, lets lay out our keymap file.

** Headers

   #+BEGIN_SRC C :noweb yes
#include QMK_KEYBOARD_H

extern keymap_config_t keymap_config;

   #+END_SRC

** Keycodes

   #+BEGIN_SRC C :noweb yes
// where the 'T_' communicates how the key does something different when tapped.
enum planck_keycodes {
//DVORAK = SAFE_RANGE,
KC_T_LALT = SAFE_RANGE,
KC_T_RALT,
KC_T_LGUI,
KC_T_RGUI,
KC_T_LCTL,
KC_T_RCTL,
KC_T_LSFT,
KC_T_RSFT,
KC_T_LRSE,
KC_T_RRSE,
KC_EZRGHT,
KC_EZLEFT,
KC_EZUP,
KC_EZDOWN,
KC_EZUNDO,
KC_EZCOPY,
KC_EZCUT,
KC_EZPSTE,
KC_EZSHFT,
KC_EZCTRL,
KC_EZGUI,
KC_EZALT,
KC_DVORAK,
KC_QWERTY,
KC_COM
};

   #+END_SRC

** Import Key table

   #+BEGIN_SRC C :noweb yes
enum planck_layers {
_DVORAK,
_QWERTY,
_RISE,
_COMMAND
};

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {

   #+END_SRC

   #+BEGIN_SRC C :noweb yes
[_DVORAK] = LAYOUT_planck_grid(
<<layer-to-array(home-layer)>>
),
[_QWERTY] = LAYOUT_planck_grid(
<<layer-to-array(qwerty-layer)>>
),
[_RISE] = LAYOUT_planck_grid(
<<layer-to-array(secondary-layer)>>
),
[_COMMAND] = LAYOUT_planck_grid(
<<layer-to-array(command-layer)>>
)
};

   #+END_SRC

** Tap Keys

   I don't like tap keys coming out on release. When modified, I often let go of
   the modifier too early because the tap button doesn't come out untill release. I
   guess you could save the state of the board on press and then apply it after the
   timer, but what I really want is the keys to come out on press when they can and
   when it is most useful. For me, that is when they are modified a single time. So
   I kind of "locked" the board into only doing single modifiers, making them faster.
   Disadvantages are double modified keys must be done with one shot keys (its
   actually not that bad, it feels like emacs!) and triple modified keys are
   impossible at the moment.

   #+BEGIN_SRC C :noweb yes

  static uint16_t tap_timer = 0;
  char last_mod = 10;

  void mod_press(uint16_t tap_code, uint16_t hold_code, int id) {
      /* this first if body makes double modified keys impossible, but stops the */
      /* delay when modifying a tap key which would result in the tap key not */
      /* getting modified. */
      if (last_mod != id && last_mod != 10) {
          tap_code16(tap_code);
          last_mod = 10;
      } else {
          tap_timer = timer_read();
          last_mod = id;
          register_code(hold_code);
      }
  }

  void mod_lift(uint16_t tap_code, uint16_t hold_code, int id) {
      unregister_code(hold_code);
      if (last_mod == id && timer_elapsed(tap_timer) < TAPPING_TERM) {
          tap_code16(tap_code);
      }
      last_mod = 10;
  }

   #+END_SRC
** Process User Input

   #+BEGIN_SRC C :noweb yes
bool process_record_user(uint16_t keycode, keyrecord_t *record) {
    switch (keycode) {
   #+END_SRC

*** Layouts

    Set Dvorak layout

    #+BEGIN_SRC C :noweb yes
 case KC_DVORAK:
 if (record->event.pressed) {
     set_single_persistent_default_layer(_DVORAK);
 }
 return true;
 break;

    #+END_SRC

    Set Qwerty layout.

    #+BEGIN_SRC C :noweb yes
 case KC_QWERTY:
 if (record->event.pressed) {
     set_single_persistent_default_layer(_QWERTY);
 }
 return true;
 break;

    #+END_SRC

*** Custom Keys
**** Command Layer One Shot

    #+BEGIN_SRC C :noweb yes
 case KC_COM:
 if (record->event.pressed) {
     layer_on(_COMMAND);
     set_oneshot_layer(_COMMAND, ONESHOT_START);
     last_mod = 10;
 } else {
     clear_oneshot_layer_state (ONESHOT_PRESSED);
 }
 return false;
 break;
    #+END_SRC

**** Tap Keys

    #+BEGIN_SRC C :noweb yes
    <<define-tap-key(3, 1, 0)>>
    <<define-tap-key(3, 10, 1)>>
    <<define-tap-key(3, 0, 2)>>
    <<define-tap-key(3, 11, 3)>>
    <<define-tap-key(2, 0, 4)>>
    <<define-tap-key(2, 11, 5)>>
    <<define-tap-key(1, 0, 6)>>
    <<define-tap-key(1, 11, 7)>>
    #+END_SRC

**** Rise Keys

    #+BEGIN_SRC C :noweb yes
 case KC_T_LRSE:
 if (record->event.pressed) {
     tap_timer = timer_read();
     last_mod = 8;
     layer_on(_RISE);
 } else {
     layer_off(_RISE);
     if (last_mod == 8 && timer_elapsed(tap_timer) < TAPPING_TERM) {
         tap_code16(KC_DELETE);
         last_mod = 10;
     }
 }
 return false;
 break;
 case KC_T_RRSE:
 if (record->event.pressed) {
     tap_timer = timer_read();
     last_mod = 9;
     layer_on(_RISE);
 } else {
     layer_off(_RISE);
     if (last_mod == 9 && timer_elapsed(tap_timer) < TAPPING_TERM) {
         tap_code16(KC_BSPACE);
         last_mod = 10;
     }
 }
 return false;
 break;

    #+END_SRC

**** One Shot Keys

     Since I made modified tap keys occur on press instead of release, I need one
     shot keys to press any key with more than one modifier.

     #+BEGIN_SRC C :noweb yes
 case KC_EZSHFT:
 if (record->event.pressed) {
     set_oneshot_mods(MOD_LSFT);
     last_mod = 10;
 }
 return false;
 break;
 case KC_EZCTRL:
 if (record->event.pressed) {
     set_oneshot_mods(MOD_LCTL);
     last_mod = 10;
 }
 return false;
 break;
 case KC_EZALT:
 if (record->event.pressed) {
     set_oneshot_mods(MOD_LALT);
     last_mod = 10;
 }
 return false;
 break;
 case KC_EZGUI:
 if (record->event.pressed) {
     set_oneshot_mods(MOD_LGUI);
     last_mod = 10;
 }
 return false;
 break;

     #+END_SRC

**** C-S Arrows

     I use ctrl+shift+arrows keys a lot, so when the layer key is pressed they became
     lazy versions of themselves with control and shift already pressed.

     I also added undo, copy, paste, and cut to be easily available with only the
     left hand like on a qwerty or colemek keyboard.

     #+BEGIN_SRC C :noweb yes
 case KC_EZRGHT:
 if (record->event.pressed) {
     register_code(KC_LCTL);
     tap_code16(S(KC_RGHT));
     unregister_code(KC_LCTL);
     last_mod = 10;
 }
 return false;
 break;
 case KC_EZLEFT:
 if (record->event.pressed) {
     register_code(KC_LCTL);
     tap_code16(S(KC_LEFT));
     unregister_code(KC_LCTL);
     last_mod = 10;
 }
 return false;
 break;
 case KC_EZDOWN:
 if (record->event.pressed) {
     register_code(KC_LCTL);
     tap_code16(S(KC_DOWN));
     unregister_code(KC_LCTL);
     last_mod = 10;
 }
 return false;
 break;
 case KC_EZUP:
 if (record->event.pressed) {
     register_code(KC_LCTL);
     tap_code16(S(KC_UP));
     unregister_code(KC_LCTL);
     last_mod = 10;
 }
 return false;
 break;
     #+END_SRC

**** Undo, Copy, Cut, Paste

     #+BEGIN_SRC C :noweb yes
 case KC_EZUNDO:
 if (record->event.pressed) {
     tap_code16(C(KC_Z));
     last_mod = 10;
 }
 return false;
 break;
 case KC_EZCOPY:
 if (record->event.pressed) {
     tap_code16(C(KC_C));
     last_mod = 10;
 }
 return false;
 break;
 case KC_EZCUT:
 if (record->event.pressed) {
     tap_code16(C(KC_X));
     last_mod = 10;
 }
 return false;
 break;
 case KC_EZPSTE:
 if (record->event.pressed) {
     tap_code16(C(KC_V));
     last_mod = 10;
 }
 return false;
 break;
     #+END_SRC

*** Standard inputs interupt tap

    Finally, if just a standard key is tapped, set the interupted flag.
    Keep this last.

    #+BEGIN_SRC C :noweb yes
 }
 last_mod = 10;
 return true;
 }
    #+END_SRC
