Copy in systemwide NERD font during build

Means it works when running from source and can be used as the
source for copying the font into built packages

setup.py

@@ -837,7 +837,7 @@ def parallel_run(items: List[Command]) -> None:
             if verbose:
                 print(' '.join(compile_cmd.cmd))
             elif isatty:
-                print(f'\r\x1b[K[{num}/{total}] {compile_cmd.desc}', end='')
+                print(f'\r\x1b[K[{num}/{total}] {compile_cmd.desc}', end='')  # ]]
             else:
                 print(f'[{num}/{total}] {compile_cmd.desc}', flush=True)
             printed = True
@@ -853,6 +853,38 @@ def parallel_run(items: List[Command]) -> None:
         run_tool(list(failed.cmd))
 
 
+def add_builtin_fonts(args: Options) -> None:
+    fonts_dir = os.path.join(src_base, 'fonts')
+    os.makedirs(fonts_dir, exist_ok=True)
+
+    for psname, (filename, human_name) in {
+        'SymbolsNFM': ('SymbolsNerdFontMono-Regular.ttf', 'Symbols NERD Font Mono')
+    }.items():
+        dest = os.path.join(fonts_dir, filename)
+        if os.path.exists(dest):
+            continue
+        font_file = ''
+        if is_macos:
+            for candidate in (os.path.expanduser('~/Library/Fonts'), '/Library/Fonts', '/System/Library/Fonts', '/Network/Library/Fonts'):
+                q = os.path.join(candidate, filename)
+                if os.path.exists(q):
+                    font_file = q
+                    break
+        else:
+            lines = subprocess.check_output([
+                'fc-match', '--format', '%{file}\n%{postscriptname}', f'term:postscriptname={psname}', 'file', 'postscriptname']).decode().splitlines()
+            if len(lines) != 2:
+                raise SystemExit(f'fc-match returned unexpected output: {lines}')
+            if lines[1] != psname:
+                raise SystemExit(f'The font {human_name!r} was not found on your system, please install it')
+            font_file = lines[0]
+        if not font_file:
+            raise SystemExit(f'The font {human_name!r} was not found on your system, please install it')
+        print(f'Copying {human_name!r} from {font_file}')
+        shutil.copy(font_file, dest)
+        os.chmod(dest, 0o644)
+
+
 def compile_c_extension(
     kenv: Env,
     module: str,
@@ -1093,6 +1125,7 @@ def build(args: Options, native_optimizations: bool = True, call_init: bool = Tr
     )
     compile_glfw(args.compilation_database, args.build_dsym)
     compile_kittens(args)
+    add_builtin_fonts(args)
 
 
 def safe_makedirs(path: str) -> None: