[file_packager] Allow negative patterns in exclude argument

test/test_other.py

@@ -2060,7 +2060,7 @@ def test_embed_file_dup(self, args):
     self.do_runf('main.c', '|frist|\n|sacond|\n|thard|\n',
                  cflags=['--embed-file', 'tst'] + args)
 
-  def test_exclude_file(self):
+  def test_file_packager_exclude_file(self):
     ensure_dir('tst/abc.exe')
     ensure_dir('tst/abc.txt')
 
@@ -2083,6 +2083,52 @@ def test_exclude_file(self):
     self.run_process([EMCC, 'main.c', '--embed-file', 'tst', '--exclude-file', '*.exe'])
     self.assertEqual(self.run_js('a.out.js').strip(), '')
 
+  def test_file_packager_exclude_file_negative(self):
+    ensure_dir('tst/abc.exe')
+    ensure_dir('tst/abc.txt')
+
+    create_file('tst/hello.exe', 'hello')
+    create_file('tst/hello.txt', 'world')
+    create_file('tst/abc.exe/foo', 'emscripten')
+    create_file('tst/abc.txt/bar', '!!!')
+    create_file('main.c', r'''
+      #include <stdio.h>
+      int main() {
+        if(!fopen("tst/hello.exe", "rb")) printf("Failed\n");
+        if(!fopen("tst/hello.txt", "rb")) printf("Failed\n");
+        if(fopen("tst/abc.exe/foo", "rb")) printf("Failed\n");
+        if(!fopen("tst/abc.txt/bar", "rb")) printf("Failed\n");
+
+        return 0;
+      }
+    ''')
+
+    self.run_process([EMCC, 'main.c', '--embed-file', 'tst', '--exclude-file', '*.exe', '--exclude-file', '!*hello.exe'])
+    self.assertEqual(self.run_js('a.out.js').strip(), '')
+
+  def test_file_packager_exclude_file_negative_order(self):
+    ensure_dir('tst/abc.exe')
+    ensure_dir('tst/abc.txt')
+
+    create_file('tst/hello.exe', 'hello')
+    create_file('tst/hello.txt', 'world')
+    create_file('tst/abc.exe/foo', 'emscripten')
+    create_file('tst/abc.txt/bar', '!!!')
+    create_file('main.c', r'''
+      #include <stdio.h>
+      int main() {
+        if(fopen("tst/hello.exe", "rb")) printf("Failed\n");
+        if(!fopen("tst/hello.txt", "rb")) printf("Failed\n");
+        if(fopen("tst/abc.exe/foo", "rb")) printf("Failed\n");
+        if(!fopen("tst/abc.txt/bar", "rb")) printf("Failed\n");
+
+        return 0;
+      }
+    ''')
+
+    self.run_process([EMCC, 'main.c', '--embed-file', 'tst', '--exclude-file', '!*hello.exe', '--exclude-file', '*.exe'])
+    self.assertEqual(self.run_js('a.out.js').strip(), '')
+
   def test_dylink_strict(self):
     self.do_run_in_out_file_test('hello_world.c', cflags=['-sSTRICT', '-sMAIN_MODULE=1'])
 

tools/file_packager.py

@@ -28,6 +28,7 @@
 
   --exclude E [F..] Specifies filename pattern matches to use for excluding given files from being added to the package.
                     See https://docs.python.org/2/library/fnmatch.html for syntax.
+                    Negative patterns are also supported using ! prefex.
 
   --from-emcc Indicate that `file_packager` was called from `emcc` and will be further processed by it, so some code generation can be skipped here
 
@@ -156,8 +157,15 @@ def should_ignore(fullname):
   is hidden (Win32) or it matches any pattern specified in --exclude"""
   if has_hidden_attribute(fullname):
     return True
-
-  return any(fnmatch.fnmatch(fullname, p) for p in excluded_patterns)
+  ignored = False
+  for pattern in excluded_patterns:
+      if pattern.startswith("!"):
+          if fnmatch.fnmatch(fullname, pattern[1:]):
+              ignored = False
+      else:
+          if fnmatch.fnmatch(fullname, pattern):
+              ignored = True
+  return ignored
 
 
 def add(mode, rootpathsrc, rootpathdst):