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1 files changed, 63 insertions, 0 deletions

diff --git a/themes/hugo-theme-stack/assets/ts/color.ts b/themes/hugo-theme-stack/assets/ts/color.ts
new file mode 100644
index 0000000..50581d1
--- /dev/null
+++ b/themes/hugo-theme-stack/assets/ts/color.ts
@@ -0,0 +1,63 @@
+interface colorScheme {
+    hash: string,                        /// Regenerate color scheme when the image hash is changed
+    DarkMuted: {
+        hex: string,
+        rgb: Number[],
+        bodyTextColor: string
+    },
+    Vibrant: {
+        hex: string,
+        rgb: Number[],
+        bodyTextColor: string
+    }
+}
+
+let colorsCache: { [key: string]: colorScheme } = {};
+
+if (localStorage.hasOwnProperty('StackColorsCache')) {
+    try {
+        colorsCache = JSON.parse(localStorage.getItem('StackColorsCache'));
+    }
+    catch (e) {
+        colorsCache = {};
+    }
+}
+
+async function getColor(key: string, hash: string, imageURL: string) {
+    if (!key) {
+        /**
+         * If no key is provided, do not cache the result
+         */
+        return await Vibrant.from(imageURL).getPalette();
+    }
+
+    if (!colorsCache.hasOwnProperty(key) || colorsCache[key].hash !== hash) {
+        /**
+         * If key is provided, but not found in cache, or the hash mismatches => Regenerate color scheme
+         */
+        const palette = await Vibrant.from(imageURL).getPalette();
+
+        colorsCache[key] = {
+            hash: hash,
+            Vibrant: {
+                hex: palette.Vibrant.hex,
+                rgb: palette.Vibrant.rgb,
+                bodyTextColor: palette.Vibrant.bodyTextColor
+            },
+            DarkMuted: {
+                hex: palette.DarkMuted.hex,
+                rgb: palette.DarkMuted.rgb,
+                bodyTextColor: palette.DarkMuted.bodyTextColor
+            }
+        }
+
+        /* Save the result in localStorage */
+        localStorage.setItem('StackColorsCache', JSON.stringify(colorsCache));
+    }
+
+    return colorsCache[key];
+}
+
+export {
+    getColor
+}
\ No newline at end of file