upstream-zulip/patches/jdenticon.patch

diff --git a/bin/jdenticon.js b/bin/jdenticon.js
index 752f5f6277b204928751b555216a1e2655e47289..d5e4b536b1c20c6ecf6eac1575c050cc88794467 100755
--- a/bin/jdenticon.js
+++ b/bin/jdenticon.js
@@ -50,6 +50,8 @@ function writeHelp() {
     console.log("  -f, --format <svg|png>    Format of generated icon. Otherwise detected from output path. (default: png)");
     console.log("  -b, --back-color <value>  Background color on format #rgb, #rgba, #rrggbb or #rrggbbaa. (default: transparent)");
     console.log("  -p, --padding <value>     Padding in percent in range 0 to 0.5. (default: 0.08)");
+    console.log("  --lightness-color <min,max>      Lightness range of colored shapes in [0,1]. (default: 0.4,0.8)");
+    console.log("  --lightness-grayscale <min,max>  Lightness range of grayscale shapes in [0,1]. (default: 0.3,0.9)");
     console.log("  -v, --version             Gets the version of Jdenticon.");
     console.log("  -h, --help                Show this help information.");
     console.log("");
@@ -117,10 +119,33 @@ function parseArgs(args) {
         format: consume(["-f", "--format"], true),
         padding: consume(["-p", "--padding"], true),
         backColor: consume(["-b", "--back-color"], true),
+        lightnessColor: consume(["--lightness-color"], true),
+        lightnessGrayscale: consume(["--lightness-grayscale"], true),
         value: args
     };
 }
 
+function parseLightnessRange(value) {
+    var parts = value.split(",");
+    if (parts.length !== 2) {
+        return;
+    }
+
+    var min = Number(parts[0]);
+    var max = Number(parts[1]);
+
+    if (
+        isNaN(min) || isNaN(max) ||
+        min < 0 || min > 1 ||
+        max < 0 || max > 1 ||
+        min > max
+    ) {
+        return;
+    }
+
+    return [min, max];
+}
+
 function validateArgs(args) {
     if (args.value.length) {
 
@@ -153,7 +178,34 @@ function validateArgs(args) {
                 console.warn("WARN Invalid background color specified. Defaults to transparent.");
             }
         }
-        
+
+        // Lightness
+        var lightnessColor;
+        if (args.lightnessColor != null) {
+            lightnessColor =  parseLightnessRange(args.lightnessColor);
+            if (!lightnessColor) {
+                lightnessColor = [0.4, 0.8];
+                console.warn("WARN Invalid lightness range of colored shapes specified. Defaults to 0.4,0.8.");
+            }
+        }
+
+        var lightnessGrayscale;
+        if (args.lightnessGrayscale != null) {
+            lightnessGrayscale = parseLightnessRange(args.lightnessGrayscale);
+            if (!lightnessGrayscale) {
+                lightnessGrayscale = [0.3, 0.9];
+                console.warn("WARN Invalid lightness range of grayscale shapes specified. Defaults to 0.3,0.9.");
+            }
+        }
+
+        var lightness;
+        if (lightnessColor || lightnessGrayscale) {
+            lightness = {
+                color: lightnessColor,
+                grayscale: lightnessGrayscale
+            };
+        }
+
         // Format
         var generateSvg = 
             args.format ? /^svg$/i.test(args.format) :
@@ -166,7 +218,8 @@ function validateArgs(args) {
         return {
             config: {
                 padding: padding,
-                backColor: backColor
+                backColor: backColor,
+                lightness: lightness
             },
             output: args.output,
             size: size,