Add magic repeat/shift

config/base.keymap

@@ -101,13 +101,24 @@ ZMK_HOLD_TAP(mt_end, bindings = <&masked_end>, <&kp>; MT_CORE)
 MASK_MODS(masked_home, (MOD_LCTL), &kp HOME)
 MASK_MODS(masked_end,  (MOD_LCTL), &kp END)
 
-/* Caps-word & auto-layers */
-
-// Tap: sticky-shift | Shift + tap/ double-tap: caps-word | Hold: shift.
-ZMK_MOD_MORPH(smart_shft,
-  bindings = <&sk LSHFT>, <&caps_word>;
-  mods = <(MOD_LSFT)>;
-)
+/* Magic-shift & auto-layers */
+
+// Tap: repeat after alpha, else sticky-shift |
+// Shift + tap/ double-tap: caps-word | Hold: shift.
+#define MAGIC_SHIFT &magic_shift LSHFT 0
+ZMK_HOLD_TAP(magic_shift, bindings = <&kp>, <&magic_shift_tap>;
+             flavor = "balanced"; tapping-term-ms = <200>;
+             quick-tap-ms = <QUICK_TAP_MS>;)
+ZMK_MOD_MORPH(magic_shift_tap, bindings = <&shift_repeat>, <&caps_word>;
+              mods = <(MOD_LSFT)>;)
+ZMK_ADAPTIVE_KEY(
+    shift_repeat, bindings = <&sk LSHFT>;
+    repeat {
+      trigger-keys = <A B C D E F G H I J K L M N O P Q R S T U V W X Y Z>;
+      bindings = <&key_repeat>;
+      max-prior-idle-ms = <1200>;
+      strict-modifiers;
+    };)
 &caps_word { // Mods deactivate caps-word, requires PR #1451. [TODO: rebase]
   /delete-property/ ignore-modifiers;
 };
@@ -196,7 +207,7 @@ ZMK_BASE_LAYER(Base,
 //├─────────────┼─────────────┼─────────────┼─────────────┼─────────────┤ ├─────────────┼─────────────┼─────────────┼─────────────┼─────────────┤
     &kp Z         &kp X         &kp C         &kp D         &kp V       ,   &kp K         &kp H         &comma_morph  &dot_morph    &qexcl      ,
 //╰─────────────┼─────────────┴─────────────┼─────────────┼─────────────┤ ├─────────────┼─────────────┼─────────────┴───────────────────────────╯
-                                              &lt_spc NAV 0 &lt FN RET  ,   SMART_NUM     &smart_shft
+                                              &lt_spc NAV 0 &lt FN RET  ,   SMART_NUM     MAGIC_SHIFT
 //                                          ╰─────────────┴─────────────╯ ╰─────────────┴─────────────╯
 )
 

draw/config.yaml

@@ -29,10 +29,8 @@ parse_config:
     "&kp LS(TAB)": Prev Win
     "&dot_spc": Sentence
     "&num_dance": { "t": "Numword", "s": "Sticky Num" }
-    "&magic": Repeat / Smart Shift
+    "&magic_shift": { "t": Magic, "h": "Shift" }
     "&smart_mouse": Smart Mouse
-    # "&smart_num": Smart Num
-    # "&smart_shft": Smart Shift
 
     "&hml LS(LALT)TAB": Tab
     "&hm_combo_ldr": Leader

readme.md

@@ -15,14 +15,15 @@ The state of the entire firmware is pinned in my `west`
 - ["Timeless" homerow mods](#timeless-homerow-mods)
 - Combos instead of symbol layer
 - Auto-toggle off numbers and mouse layers
+- Magic thumb quadrupling as Repeat/Sticky-shift/Capsword/Shift
 - Leader key sequences for Unicode input and system commands
 - Arrow-cluster doubles as <kbd>home</kbd>, <kbd>end</kbd>, <kbd>begin/end of
   document</kbd> on long-press
 - Shifted actions that make sense: <kbd>, ↦ ;</kbd>, <kbd>. ↦ :</kbd> and <kbd>?
   ↦ !</kbd>
 - Simpler Devicetree syntax using helper macros from
   [zmk-helpers](https://github.com/urob/zmk-helpers)
-- Fully automated, nix-based [local build environment](#local-build-environment)
+- Fully automated, nix-powered [local build environment](#local-build-environment)
 
 ![](draw/keymap.png)
 ([Click here](https://raw.githubusercontent.com/urob/zmk-config/refs/heads/main/draw/base.svg)
@@ -202,11 +203,13 @@ Similarly to Numword, I have a smart-mouse layer (activated by comboing
 and mouse-movements, and replaces the right thumbs with mouse buttons. Pressing
 any other key automatically deactivates the layer.
 
-##### Capsword
+##### Magic Repeat/Shift/Capsword
 
-My right thumb triggers three variations of shift: Tapping yields sticky-shift
-(used to capitalize alphas), holding activates a regular shift, and
-double-tapping (or equivalently shift + tap) activates ZMK's Caps-word behavior.
+My right thumb triggers three variations of shift as well as repeat: Tapping
+after any alpha key yields key-repeat (to reduce SFUs). Tapping after any other
+keycode yields sticky-shift (used to capitalize alphas). Holding activates a
+regular shift, and double-tapping (or equivalently shift + tap) activates ZMK's
+Caps-word behavior.
 
 One minor technical detail: While it would be possible to implement the
 double-tap functionality as a tap-dance, this would add a delay when using