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# cardinal [](http://travis-ci.org/thlorenz/cardinal)
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<a href="https://www.patreon.com/bePatron?u=8663953"><img alt="become a patron" src="https://c5.patreon.com/external/logo/become_a_patron_button.png" height="35px"></a>
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[](https://nodei.co/npm/cardinal/)
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**car·di·nal** *(kärdn-l, kärdnl)* - crested thick-billed North American finch having bright red plumage in the male.
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## Features
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- highlights JavaScript code with ANSI colors to improve terminal output
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- theming support, see [custom color themes](https://github.com/thlorenz/cardinal/tree/master/themes)
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- optionally print line numbers
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- API and command line interface (`cdl`)
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- `.cardinalrc` config to customize settings
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- supports UNIX pipes
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***
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**Table of Contents** *generated with [DocToc](http://doctoc.herokuapp.com/)*
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- [Installation](#installation)
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- [As library](#as-library)
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- [As Commandline Tool](#as-commandline-tool)
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- [Commandline](#commandline)
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- [Highlight a file](#highlight-a-file)
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- [As part of a UNIX pipe](#as-part-of-a-unix-pipe)
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- [Theme](#theme)
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- [API](#api)
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- [*highlight(code[, opts])*](#highlightcode-opts)
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- [*highlightFileSync(fullPath[, opts])*](#highlightfilesyncfullpath-opts)
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- [*highlightFile(fullPath[, opts], callback)*](#highlightfilefullpath-opts-callback)
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- [opts](#opts)
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- [Examples ([*browse*](https://github.com/thlorenz/cardinal/tree/master/examples))](#examples-[browse]https://githubcom/thlorenz/cardinal/tree/master/examples)
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## Installation
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### As library
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npm install cardinal
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### As Commandline Tool
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[sudo] npm install -g cardinal
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**Note:**
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When installed globally, cardinal exposes itself as the `cdl` command.
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## Commandline
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### Highlight a file
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cdl <file.js> [options]
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**options**:
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- `--nonum`: turns off line number printing (relevant if it is turned on inside `~/.cardinalrc`
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### As part of a UNIX pipe
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cat file.js | grep console | cdl
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**Note:**
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Not all code lines may be parsable JavaScript. In these cases the line is printed to the terminal without
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highlighting it.
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### Theme
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The default theme will be used for highlighting.
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To use a different theme, include a `.cardinalrc` file in your `HOME` directory.
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This is a JSON file of the following form:
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```json
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{
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"theme": "hide-semicolons",
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"linenos": true|false
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}
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```
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- `theme` can be the name of any of the [built-in themes](https://github.com/thlorenz/cardinal/tree/master/themes) or the
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full path to a custom theme anywhere on your computer.
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- linenos toggles line number printing
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## API
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### *highlight(code[, opts])*
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- returns the highlighted version of the passed code ({String}) or throws an error if it was not able to parse it
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- opts (see below)
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### *highlightFileSync(fullPath[, opts])*
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- returns the highlighted version of the file whose fullPath ({String}) was passed or throws an error if it was not able
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to parse it
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- opts (see below)
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### *highlightFile(fullPath[, opts], callback)*
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- calls back with the highlighted version of the file whose fullPath ({String}) was passed or with an error if it was not able
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to parse it
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- opts (see below)
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- `callback` ({Function}) has the following signature: `function (err, highlighted) { .. }`
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### opts
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opts is an {Object} with the following properties:
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- `theme` {Object} is used to optionally override the theme used to highlight
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- `linenos` {Boolean} if `true` line numbers are included in the highlighted code
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- `firstline` {Integer} sets line number of the first line when line numbers are printed
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- `jsx` {Boolean} if `true` _JSX_ syntax is supported, otherwise cardinal will raise an error
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when encountering _JSX_ (default: `false`)
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**Note** The `json` option is obsoleted and not necessary anymore as cardinal properly understands both JSON and JavaScript.
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## Examples ([*browse*](https://github.com/thlorenz/cardinal/tree/master/examples))
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- [sample .cardinalrc](https://github.com/thlorenz/cardinal/blob/master/examples/.cardinalrc)
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- [highlighting a code snippet](https://github.com/thlorenz/cardinal/blob/master/examples/highlight-string.js) via
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***highlight()***
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- [file that highlights itself](https://github.com/thlorenz/cardinal/blob/master/examples/highlight-self.js) via
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***highlightFile()*** including line numbers
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- [file that highlights itself hiding all
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semicolons](https://github.com/thlorenz/cardinal/blob/master/examples/highlight-self-hide-semicolons.js) via
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***highlightFileSync()***
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