TIL: Send a specific key before every keypress on certain layer

custom_keyboard/qmk/send-a-specific-key-before-every-keypress-on-certain-layer.md

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+This is archive of a reddit post of mine: [Send a specific key before every keypress on certain layer](https://www.reddit.com/r/olkb/comments/qla8l1/send_a_specific_key_before_every_keypress_on/)
+
+---
+
+
+## Problem:
+
+> Hi all, I'm configuring my Sofle and there is just one thing left that I couldn't manage to do by reading the docs. Here is the case:
+
+> I want to send `Ctrl-v` before every keypress if I'm on a certain layer. If I press `a` on that layer, the keyboard should send `Ctrl-v` then `a`. I think this should be possible to do using macros as the documentation states "Macros allow you to send multiple keystrokes when pressing just one key." However, I just couldn't find a way to implement it. Can you just give me simple example to start with?
+
+> If you are curious why would anyone needs such functionality: the web extension I'm using (tridactyl) have different modes (normal, ignore etc.) and `Ctrl-v` sends me to the ignore mode for just one keypress. If I want to send multiple commands in ignore mode, I can either switch to ignore mode or press `ctrl-v` and the key I want to send. I usually want to stay in normal mode. So I wanted to create a layer on my keyboard and switch to that layer when I want to send commands in ignore mode.
+
+
+## Solution:
+> I figured it out! I have created a new layer and set a flag when I switched to it. Then inside `process_record_user` I checked for the flag and if that's the case sent `Ctrl-v` before the keypress.
+
+```
+bool is_youtube_layer = false;
+layer_state_t layer_state_set_user(layer_state_t state){
+    switch (get_highest_layer(state)) {
+        case _YOUTUBE:
+            is_youtube_layer = true;
+            break;
+        default:
+            is_youtube_layer = false;
+    }
+    return state;
+}
+
+uint8_t mod_state;
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+    mod_state= get_mods();
+    if (is_youtube_layer){
+        switch (keycode) {
+          case KC_A ... KC_Z:
+            if (record->event.pressed){
+              clear_mods();
+              tap_code16(C(KC_V));
+              set_mods(mod_state);
+              register_code(keycode);
+            } else {
+              unregister_code(keycode);
+            }
+            return false;
+        }
+    }
+    switch (keycode) {
+     ...
+   }
+}
+```