[Erez & Jack] Documents new Leader key functionality

README.md

@@ -118,6 +118,42 @@ We've added shortcuts to make common modifier/tap (mod-tap) mappings more compac
   * `LCAG_T(kc)` - is CtrlAltGui when held and *kc* when tapped
   * `MEH_T(kc)` - is like Hyper, but not as cool -- does not include the Cmd/Win key, so just sends Alt+Ctrl+Shift.
 
+### The Leader key: A new kind of modifier
+
+If you've ever used Vim, you know what a Leader key is. If not, you're about to discover a wonderful concept. :) Instead of hitting Alt+Shift+W for example (holding down three keys at the same time), what if you could hit a _sequence_ of keys instead? So you'd hit our special modifier (the Leader key), followed by W and then C (just a rapid succession of keys), and something would happen.
+
+That's what `KC_LEAD` does. Here's an example:
+
+1. Pick a key on your keyboard you want to use as the Leader key. Assign it the keycode `KC_LEAD`. This key would be dedicated just for this -- it's a single action key, can't be used for anything else.
+2. Include the line `#define LEADER_TIMEOUT 300` somewhere in your keymap.c file, probably near the top. The 300 there is 300ms -- that's how long you have for the sequence of keys following the leader. You can tweak this value for comfort, of course.
+3. Within your `matrix_scan_user` function, do something like this:
+
+```
+void matrix_scan_user(void) {
+  LEADER_DICTIONARY() {
+    leading = false;
+    leader_end();
+
+    SEQ_ONE_KEY(KC_F) {
+      register_code(KC_S);
+      unregister_code(KC_S);
+    }
+    SEQ_TWO_KEYS(KC_A, KC_S) {
+      register_code(KC_H);
+      unregister_code(KC_H);
+    }
+    SEQ_THREE_KEYS(KC_A, KC_S, KC_D) {
+      register_code(KC_LGUI);
+      register_code(KC_S);
+      unregister_code(KC_S);
+      unregister_code(KC_LGUI);
+    }
+  }
+}
+```
+
+As you can see, you have three function. you can use - `SEQ_ONE_KEY` for single-key sequences (Leader followed by just one key), and `SEQ_TWO_KEYS` and `SEQ_THREE_.EYS` for longer sequences. Each of these accepts one or more keycodes as arguments. This is an important point: You can use keycodes from **any layer on your keyboard**. That layer would need to be active for the leader macro to fire, obviously.
+
 ### Temporarily setting the default layer
 
 `DF(layer)` - sets default layer to *layer*. The default layer is the one at the "bottom" of the layer stack - the ultimate fallback layer. This currently does not persist over power loss. When you plug the keyboard back in, layer 0 will always be the default. It is theoretically possible to work around that, but that's not what `DF` does.

keyboard/ergodox_ez/ergodox_ez.h

@@ -1,13 +1,9 @@
 #ifndef ERGODOX_EZ_H
 #define ERGODOX_EZ_H
 
-#include "matrix.h"
+#include "quantum.h"
-#include "keymap_common.h"
-#include "backlight.h"
-#include <stddef.h>
 #include <stdint.h>
 #include <stdbool.h>
-#include <avr/io.h>
 #include "i2cmaster.h"
 #include <util/delay.h>
 

keyboard/ergodox_ez/keymaps/erez_experimental/keymap.c

@@ -9,6 +9,7 @@
 
 #define LSFTO M(0) // Left shift, open parens when tapped
 #define RSFTC M(1) // Right shift, close parens when tapped
+#define LEADER_TIMEOUT 300
 
 const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
 /* Keymap 0: Basic layer
@@ -27,9 +28,9 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
  *                                        ,-------------.       ,-------------.
  *                                        | App  | LGui |       | Alt  |Ctrl/Esc|
  *                                 ,------|------|------|       |------+--------+------.
- *                                 |      | L1   | Home |       | PgUp |        |      |
+ *                                 |      |      | Home |       | PgUp |        |      |
- *                                 | Space| Tap/ |------|       |------| Tab/L1 |Enter |
+ *                                 | Space|Leader|------|       |------| Tab/L1 |Enter |
- *                                 |      |Toggle| End  |       | PgDn |        |      |
+ *                                 |      |      | End  |       | PgDn |        |      |
  *                                 `--------------------'       `----------------------'
  */
 // If it accepts an argument (i.e, is a function), it doesn't need KC_.
@@ -43,7 +44,7 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
         LT(SYMB,KC_GRV),KC_QUOT,      LALT(KC_LSFT),  KC_LEFT,  KC_RGHT,
                                               ALT_T(KC_APP),    KC_LGUI,
                                                                 KC_HOME,
-                                                 KC_SPC,KC_FN1,KC_END,
+                                                 KC_SPC,KC_LEAD,KC_END,
         // right hand
              KC_RGHT,       KC_6,KC_7,       KC_8,   KC_9,   KC_0,            KC_MINS,
              TG(SYMB),      KC_Y,KC_U,       KC_I,   KC_O,   KC_P,            KC_BSLS,
@@ -198,6 +199,8 @@ void matrix_init_user(void) {
 
 };
 
+LEADER_EXTERNS();
+
 // Runs constantly in the background, in a loop.
 void matrix_scan_user(void) {
 
@@ -220,6 +223,26 @@ void matrix_scan_user(void) {
       break;
   }
 
+  LEADER_DICTIONARY() {
+    leading = false;
+    leader_end();
+
+    SEQ_ONE_KEY(KC_W) {
+      register_code(KC_LALT);
+      register_code(KC_F4);
+      unregister_code(KC_F4);
+      unregister_code(KC_LALT);
+    }
+    SEQ_ONE_KEY(KC_O) {
+      register_code(KC_LCTL);
+      register_code(KC_LSFT);
+      register_code(KC_O);
+      unregister_code(KC_O);
+      unregister_code(KC_LSFT);
+      unregister_code(KC_LCTL);
+    }
+  }
 };
 
 
+

keyboard/ergodox_ez/keymaps/erez_experimental/readme.md

@@ -4,6 +4,12 @@ This is my personal layout which I use to test out ideas which may or may not ma
 
 Changelog:
 
+## May 24, 2016:
+
+* Implements Leader key example
+  * Leader, W sends Alt-F4
+  * Leader, O sends Ctrl-shift-o (a shortcut I use in FrontApp) 
+
 ## May 8, 2016:
 
 * Makes bottom-right key send minus/underscore when tapped, L1 temporary toggle when held