cjkfmt 0.0.8

Formatter for CJK text files
cjkfmt-0.0.8 is not a library.

cjkfmt

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Installation

Cargo

  • Install the rust toolchain in order to have cargo installed by following this guide.
  • run cargo install cjkfmt

Formatting Files

To replace named files with their formatted content, use the --write option:

cjkfmt format --write README.md docs/example.md

Omitting --write leaves the source files unchanged and sends formatted content to stdout.

Language Selection

Named files are classified by their final extension: .md and .markdown select Markdown, and .json selects JSON. Matching is case-insensitive for ASCII letters. Other named paths require an explicit --language markdown or --language json; an explicit selection always takes precedence over the filename. format applies Markdown-prose spacing only to Markdown input, while JSON and unrecognized input still receive the general line-wrapping pass.

When reading stdin without --language, check and debug-cst assume Markdown. format uses a conservative default and skips Markdown-prose spacing. Use --language markdown or --language json to select the stdin language explicitly.

Configuration

cjkfmt can be configured in several ways, with configuration options applied in the following order of precedence (highest to lowest):

  1. Command line options
  2. Environment variables prefixed with CJKFMT_
  3. JSON configuration file .cjkfmt.json found in the current or ancestor directories
  4. JSON configuration file .cjkfmt.json in the user's configuration directory (XDG_CONFIG_HOME if set, otherwise $HOME)
  5. Default values

The configuration file is searched for in the current directory and, if not found, in each parent directory up to the root. Only the first file found will be used.

Configuration Options

Currently, the following configuration options are available:

Option Description Default
ambiguous_width Width of Unicode Ambiguous characters (narrow or wide) wide
max_width Maximum line width to allow 80
spacing.alphabets Require, prohibit, or ignore spaces around full-/half-width alphabets ignore
spacing.digits Require, prohibit, or ignore spaces around full-/half-width digits ignore

Depending on the configuration source, the option names are formatted slightly differently:

  • JSON configuration files
    • Use underscores between words. Example: max_width
  • Environment variables
    • Write names in ALL CAPITAL LETTERS with underscores between words, and always start with CJKFMT_. Example: CJKFMT_MAX_WIDTH
  • Command line options
    • Use hyphens between words, and put two dashes before the option name. Examples: --max-width 100, --ambiguous-width narrow, --spacing-alphabets require, and --spacing-digits prohibit

Example Configuration File

The format command applies the spacing rules to Markdown prose, including visible text inside emphasis and links. Code spans, fenced code blocks, URLs, HTML, and other non-prose inline content are left unchanged. For the implementation-level character classification and the difference between check and format, see the spacing implementation notes.

Below is an example configuration file .cjkfmt.json.

{
  "ambiguous_width": "wide",
  "max_width": 100,
  "spacing": {
    "alphabets": "require",
    "digits": "ignore"
  }
}

License

Licensed under either of

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.

See CONTRIBUTING.md.