fix: escape % in help text

[KiruyaMomochi]

Motivation

Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "/root/sglang/.venv/lib/python3.11/site-packages/sglang/launch_server.py", line 29, in <module>
    server_args = prepare_server_args(sys.argv[1:])
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/root/sglang/.venv/lib/python3.11/site-packages/sglang/srt/server_args.py", line 5145, in prepare_server_args
    raw_args = parser.parse_args(argv)
               ^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/lib/python3.11/argparse.py", line 1877, in parse_args
    args, argv = self.parse_known_args(args, namespace)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/lib/python3.11/argparse.py", line 1910, in parse_known_args
    namespace, args = self._parse_known_args(args, namespace)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/lib/python3.11/argparse.py", line 2131, in _parse_known_args
    start_index = consume_optional(start_index)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/lib/python3.11/argparse.py", line 2071, in consume_optional
    take_action(action, args, option_string)
  File "/opt/conda/lib/python3.11/argparse.py", line 1986, in take_action
    action(self, namespace, argument_values, option_string)
  File "/opt/conda/lib/python3.11/argparse.py", line 1125, in __call__
    parser.print_help()
  File "/opt/conda/lib/python3.11/argparse.py", line 2614, in print_help
    self._print_message(self.format_help(), file)
                        ^^^^^^^^^^^^^^^^^^
  File "/opt/conda/lib/python3.11/argparse.py", line 2598, in format_help
    return formatter.format_help()
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/lib/python3.11/argparse.py", line 288, in format_help
    help = self._root_section.format_help()
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/lib/python3.11/argparse.py", line 218, in format_help
    item_help = join([func(*args) for func, args in self.items])
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/lib/python3.11/argparse.py", line 218, in <listcomp>
    item_help = join([func(*args) for func, args in self.items])
                      ^^^^^^^^^^^
  File "/opt/conda/lib/python3.11/argparse.py", line 218, in format_help
    item_help = join([func(*args) for func, args in self.items])
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/lib/python3.11/argparse.py", line 218, in <listcomp>
    item_help = join([func(*args) for func, args in self.items])
                      ^^^^^^^^^^^
  File "/opt/conda/lib/python3.11/argparse.py", line 547, in _format_action
    help_text = self._expand_help(action)
                ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/lib/python3.11/argparse.py", line 646, in _expand_help
    return self._get_help_string(action) % params
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~
TypeError: %c requires int or char

Modifications

Replace % with %%.

Accuracy Tests

Benchmarking and Profiling

Checklist

• Format your code according to the Format code with pre-commit.
• Add unit tests according to the Run and add unit tests.
• Update documentation according to Write documentations.
• Provide accuracy and speed benchmark results according to Test the accuracy and Benchmark the speed.
• Follow the SGLang code style guidance.

Review Process

1. Ping Merge Oncalls to start the PR flow. See the PR Merge Process.
2. Get approvals from CODEOWNERS and other reviewers.
3. Trigger CI tests with comments or contact authorized users to do so.
   • /tag-run-ci-label, /rerun-failed-ci, /tag-and-rerun-ci
4. After green CI and required approvals, ask Merge Oncalls to merge.

[gemini-code-assist]

Summary of Changes

Hello @KiruyaMomochi, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a critical issue where the application would crash with a TypeError when displaying help messages due to an unescaped percentage sign in an argument's help text. The fix involves correctly escaping the problematic character, ensuring that the help documentation can be rendered and viewed without errors, thereby improving the robustness of the command-line interface.

Highlights

• Bug Fix: Resolved a TypeError: %c requires int or char that occurred when argparse attempted to display help messages containing an unescaped percentage sign.
• Help Message Formatting: Escaped the literal '%' character to '%%' within the help string for the --nsa-prefill-cp-mode argument to prevent it from being misinterpreted as a format specifier.

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[gemini-code-assist]

Code Review

This pull request correctly fixes a TypeError that occurs when using the --help command-line argument. The issue was caused by an unescaped percentage sign in an argparse help string, which was being misinterpreted as a format specifier. The fix properly escapes the character by changing % to %%, which resolves the crash. The change is accurate and effective. I have reviewed the modified file for other similar instances and found no further issues. This is a good fix.