From 1620d78e73f8e01ed1d48255c655d9eb6cc1b135 Mon Sep 17 00:00:00 2001
From: "Colin T.A. Gray" <colinta@gmail.com>
Date: Tue, 5 Dec 2017 11:59:53 -0700
Subject: helper to compare current layer_state to user layer

Performs the same bit comparison that the layer_move
functions perform
---
 tmk_core/common/action_layer.c | 10 ++++++++++
 tmk_core/common/action_layer.h |  2 ++
 2 files changed, 12 insertions(+)

diff --git a/tmk_core/common/action_layer.c b/tmk_core/common/action_layer.c
index 277a8f5d95..46ea58727c 100644
--- a/tmk_core/common/action_layer.c
+++ b/tmk_core/common/action_layer.c
@@ -88,6 +88,16 @@ void layer_clear(void)
     layer_state_set(0);
 }
 
+bool layer_state_is(uint8_t layer)
+{
+    return layer_state_cmp(layer_state, layer);
+}
+
+bool layer_state_cmp(uint32_t cmp_layer_state, uint8_t layer) {
+    if (layer == 0) { return cmp_layer_state == 0; }
+    return (cmp_layer_state & (1UL<<layer)) > 0;
+}
+
 void layer_move(uint8_t layer)
 {
     layer_state_set(1UL<<layer);
diff --git a/tmk_core/common/action_layer.h b/tmk_core/common/action_layer.h
index e71604d872..5fad18cbd6 100644
--- a/tmk_core/common/action_layer.h
+++ b/tmk_core/common/action_layer.h
@@ -51,6 +51,8 @@ void default_layer_xor(uint32_t state);
 extern uint32_t layer_state;
 void layer_debug(void);
 void layer_clear(void);
+bool layer_state_is(uint8_t layer);
+bool layer_state_cmp(uint32_t layer1, uint8_t layer2);
 void layer_move(uint8_t layer);
 void layer_on(uint8_t layer);
 void layer_off(uint8_t layer);
-- 
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