home row mods!!

config/urchin.keymap

@@ -9,12 +9,29 @@
 #include <dt-bindings/zmk/bt.h>
 #include <dt-bindings/zmk/outputs.h>
 
+#include "zmk-helpers/helper.h"
+#include "zmk-helpers/key-labels/42.h"
+#include <dt-bindings/zmk/keys.h>
+
+#define QUICK_TAP_MS 175
+
 // Layer definitions
 #define BASE 0
 #define SYM 1
 #define EXT 2
 #define FNC 3
-#define SETTINGS 6
+#define SETTINGS 4
+
+/* Homerow mods */
+
+#define HM_TAPPING_TERM 300
+#define HM_TAPPING_TERM_FAST 200
+#define HM_PRIOR_IDLE 150
+
+#define KEYS_L LT0 LT1 LT2 LT3 LT4 LM0 LM1 LM2 LM3 LM4 LB0 LB1 LB2 LB3 LB4  // left hand
+#define KEYS_R RT0 RT1 RT2 RT3 RT4 RM0 RM1 RM2 RM3 RM4 RB0 RB1 RB2 RB3 RB4  // right hand
+#define KEYS_T LH1 LH0 RH0 RH1                                          // thumbs on 34 keys
+
 // -----------------
 
 &sk {
@@ -23,15 +40,59 @@
 };
 
 
-&mt {
+&mt { // mode-tap config
   flavor = "tap-preferred";
   tapping_term_ms = <200>;
   quick_tap_ms = <75>;
 };
 
+&lt {  // layer-tap config
+    flavor = "balanced";
+    tapping-term-ms = <200>;
+    quick-tap-ms = <QUICK_TAP_MS>;
+};
 
 / {
 	behaviors {
+    // Positional Homerow mods
+    // Homerow mods that prevent accidental activations when rolling keys,
+    // such as when typing `st` or `ne` on colemak-dh layouts or `as` on
+    // qwerty.
+    //
+    // Works by only allowing a mod to activate within tapping-term if
+    // it's on the opposite side of the keyboard or on the same side thumb
+    // keys.
+
+    // Further optimization using urob's timerless homerow mods method:
+    // https://github.com/urob/zmk-config#timeless-homerow-mods
+    hml: homerow_mods_left {
+        compatible = "zmk,behavior-hold-tap";
+        #binding-cells = <2>;
+        bindings = <&kp>,  <&kp>;
+
+        flavor = "balanced";
+        tapping-term-ms = <HM_TAPPING_TERM>;
+        quick-tap-ms = <175>;                // repeat on tap-into-hold
+        require-prior-idle-ms = <HM_PRIOR_IDLE>;
+
+        hold-trigger-key-positions = <KEYS_R KEYS_T>;
+        hold-trigger-on-release;
+    };
+
+    hmr: homerow_mods_right {
+        compatible = "zmk,behavior-hold-tap";
+        #binding-cells = <2>;
+        bindings = <&kp>, <&kp>;
+
+        flavor = "balanced";
+        tapping-term-ms = <HM_TAPPING_TERM>;
+        quick-tap-ms = <175>;
+        require-prior-idle-ms = <HM_PRIOR_IDLE>;
+
+        hold-trigger-key-positions = <KEYS_L KEYS_T>;
+        hold-trigger-on-release;
+    };
+
 		// Enables holding the first mod-tap key
 		// by performing a tap-release-hold sequence.
 		// To use it: "&qt KEYCODE1 KEYCODE2"
@@ -83,10 +144,10 @@
 		default_layer {
 			label = "Base";
 			bindings = <
-			&kp DOT  &kp COMMA &kp DOT &kp P &kp Y           &kp F &kp G  &kp C &kp R &kp L 
+			&kp DOT         &kp COMMA       &kp DOT         &kp P       &kp Y                  &kp F &kp G  &kp C &kp R &kp L 
-			&kp A    &kp O     &kp E   &kp U &kp I           &kp D &kp H  &kp T &kp N &kp S
+			&hml LCTRL A    &hml LALT O     &hml LSHIFT E   &hml LGUI U &kp I                  &kp D &hmr RGUI H  &hmr RSHIFT T &hmr RALT N &hmr RCTRL S
-			&kp SCLN &kp Q     &kp J &kp K   &kp X           &kp B &kp M  &kp W &kp V &kp Z
+			&kp SCLN        &kp Q           &kp J           &kp K       &kp X                  &kp B &kp M  &kp W &kp V &kp Z
-                         &mt LALT SPC  &mt LGUI TAB    &mt LSHIFT RET &mt LCTRL BSPC
+                                                 &mt LALT SPC  &mt LGUI TAB         &mt LSHIFT RET &mt LCTRL BSPC
 			>;
 		};
 
@@ -94,10 +155,10 @@
 		sym_layer {
 			label = "Sym.";
 			bindings = <
-			&kp N1 &kp N2 &kp N3 &kp N4 &kp N5		           &kp N6 &kp N7 &kp N8 &kp N9 &kp N0
+			&none &none &none &none &none              &none    &kp N7   &kp N8   &kp N9   &none
-			&none &none &none &none &none &none              &none &none &none &none
+			&none &none &none &none &none              &none    &kp N4   &kp N5   &kp N6   &none
-			&none &none &none &none &none &none              &none &none &none &none
+			&none &none &none &none &none              &kp N0   &kp N1   &kp N2   &kp N3   &none
-														&mo FNC &none              &trans &trans
+														&mo FNC &none        &trans &trans
 			>;
 		};
 

config/west.yml

@@ -6,6 +6,8 @@ manifest:
     # kyek / duckyb
     - name: duckyb
       url-base: https://github.com/duckyb
+    - name: urob
+      url-base: https://github.com/urob
   projects:
     - name: zmk
       remote: zmkfirmware
@@ -14,5 +16,11 @@ manifest:
     - name: urchin-zmk-module
       remote: duckyb
       revision: main
+    - name: zmk-helpers
+      remote: urob
+      revision: main
+    - name: zmk-auto-layer
+      remote: urob
+      revision: main
   self:
     path: config

flake.nix

@@ -33,7 +33,7 @@
           shield = "urchin_%PART%";
 
           zephyrDepsHash =
-            "sha256-9QwsEJAoMrTp4gHgCsSsrAiDC1JN3brLSINIxKJKq08=";
+            "sha256-DXOQ+Hu8p1qeLiB1loRmKG9YOVbkJWMOrDI/aVA472M=";
 
           meta = {
             description = "ZMK firmware";