From 16b72dfd63744b338cd0fc53d7b83deab6faaf4a Mon Sep 17 00:00:00 2001
From: Daniel Imms <2193314+Tyriar@users.noreply.github.com>
Date: Tue, 23 Dec 2025 03:50:34 -0800
Subject: [PATCH] Mark powerline symbol range as reserved

---
 demo/client.ts       |  4 ++--
 demo/unicodeTable.ts | 39 +++++++++++++++++++++++++++++++++------
 2 files changed, 35 insertions(+), 8 deletions(-)

diff --git a/demo/client.ts b/demo/client.ts
index c2a51268..12b0a6d0 100644
--- a/demo/client.ts
+++ b/demo/client.ts
@@ -29,7 +29,7 @@ import { WebglAddon } from '@xterm/addon-webgl';
 import { Unicode11Addon } from '@xterm/addon-unicode11';
 import { UnicodeGraphemesAddon } from '@xterm/addon-unicode-graphemes';
 
-import { writeUnicodeTable, type UnicodeRangeDefinition } from './unicodeTable';
+import { writeUnicodeTable } from './unicodeTable';
 
 export interface IWindowWithTerminal extends Window {
   term: typeof Terminal;
@@ -886,7 +886,7 @@ function customGlyphRangesHandler(): void {
   // Range: E0A0–E0BF
   // https://github.com/ryanoasis/nerd-fonts
   writeUnicodeTable(term, 'Powerline Symbols', 0xE0A0, 0xE0BF, [
-    ['Powerline Symbols', 0xE0A0, 0xE0B3],
+    ['Powerline Symbols', 0xE0A0, 0xE0B3, [0xE0A4, 0xE0A5, 0xE0A6, 0xE0A7, 0xE0A8, 0xE0A9, 0xE0AA, 0xE0AB, 0xE0AC, 0xE0AD, 0xE0AE, 0xE0AF]],
     ['Powerline Extra Symbols', 0xE0B4, 0xE0BF],
   ]);
   // Symbols for Legacy Computing
diff --git a/demo/unicodeTable.ts b/demo/unicodeTable.ts
index 3e514f75..844edcfc 100644
--- a/demo/unicodeTable.ts
+++ b/demo/unicodeTable.ts
@@ -93,11 +93,15 @@ export function writeUnicodeTable(term: Terminal, name: string, start: number, e
         term.write(' ');
         if (codePoint >= start && codePoint <= end) {
           const charColorIndex = codePointColorMap.get(codePoint);
+          const isReserved = reservedSet.has(codePoint);
+          let char = String.fromCodePoint(codePoint);
           if (charColorIndex !== undefined) {
-            term.write(color(String.fromCodePoint(codePoint), charColorIndex));
-          } else {
-            term.write(String.fromCodePoint(codePoint));
+            char = color(char, charColorIndex);
           }
+          if (isReserved) {
+            char = faint(char);
+          }
+          term.write(char);
         } else {
           term.write(' ');
         }
@@ -197,16 +201,39 @@ export function writeUnicodeTable(term: Terminal, name: string, start: number, e
       if (codePoint >= start && codePoint <= effectiveEnd) {
         // Color the character if it's part of a definition range
         const charColorIndex = codePointColorMap.get(codePoint);
+        const isReserved = reservedSet.has(codePoint);
+        let char = String.fromCodePoint(codePoint);
         if (charColorIndex !== undefined) {
-          term.write(color(String.fromCodePoint(codePoint), charColorIndex));
-        } else {
-          term.write(String.fromCodePoint(codePoint));
+          char = color(char, charColorIndex);
         }
+        if (isReserved) {
+          char = faint(char);
+        }
+        term.write(char);
       } else {
         term.write(' ');
       }
     }
 
     term.write('\n\r');
+
+    // Render reserved labels that appear after the first label (below the row)
+    // Only show one label pointing to the first reserved item when there are multiple
+    const lateReserved = rowLabels.length > 0
+      ? rowReserved.filter(r => r.col >= rowLabels[0].col)
+      : rowReserved;
+    if (lateReserved.length > 0) {
+      const prefix = ' '.repeat(8);
+      const firstReserved = lateReserved[0];
+      const colPos = firstReserved.col * 2 + 1;
+      const padding = ' '.repeat(colPos);
+      let line: string;
+      if (firstReserved.colorIndex >= 0) {
+        line = padding + color('└<reserved>', firstReserved.colorIndex);
+      } else {
+        line = padding + '└<reserved>';
+      }
+      term.write(faint(prefix + line) + '\n\r');
+    }
   }
 }