nocjk is a simple CLI tool and library to detect CJK (Chinese, Japanese, and Korean) text.

go install github.com/aethiopicuschan/nocjk/cmd/nocjk@latest
nocjk .

When CJK text is detected, the CLI exits with error code 1.

If you want to ignore the detection of a specific language, you can use the following option.

• --ignore-chinese to ignore Chinese text
• --ignore-japanese to ignore Japanese text
• --ignore-korean to ignore Korean text

You can also define ignore rules using a .nocjkignore file in your project root. The format of .nocjkignore is fully compatible with .gitignore. Files and directories matching the patterns in this file will be skipped during CJK text detection. This is especially useful when you want to exclude certain generated files or third-party code from being analyzed.

go get -u github.com/aethiopicuschan/nocjk/pkg/nocjk

nocjk provides FindChineseLines, FindJapaneseLines, FindKoreanLines and FindCJKLines functions to detect CJK text in a string. More information can be found in the documentation.

You can easily integrate nocjk into your GitHub Actions workflows to automatically detect CJK text during code changes. Here is a basic example:

jobs:
  check-cjk:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v4
      - name: Detect CJK text
        uses: aethiopicuschan/nocjk/actions/nocjk-action@v1.2.0
        with:
          ignore_chinese: false
          ignore_japanese: false
          ignore_korean: false
          args: "."

See nocjk-action on GitHub for more details.