160 lines
6.4 KiB
Markdown
160 lines
6.4 KiB
Markdown
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# relateurl [![NPM Version][npm-image]][npm-url] [![Build Status][travis-image]][travis-url] [![Dependency Status][david-image]][david-url]
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> Minify URLs by converting them from absolute to relative.
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If you were to use this library on a website like `http://example.com/dir1/dir1-1/`, you would get results such as:
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| Before | After |
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| :------------------------------------------ | :----------------------------------- |
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| `http://example.com/dir1/dir1-2/index.html` | `../dir1-2/` |
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| `http://example.com/dir2/dir2-1/` | `/dir2/dir2-1/` |
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| `http://example.com/dir1/dir1-1/` | ` ` |
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| `https://example.com/dir1/dir1-1/` | `https://example.com/dir1/dir1-1/` |
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| `http://google.com:80/dir/` | `//google.com/dir/` |
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| `../../../../../../../../#anchor` | `/#anchor` |
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**All string parsing.** *No* directory browsing. It is thoroughly tested, very fast and lightweight with zero external dependencies.
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## Getting Started
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This utility requires [Node.js](http://nodejs.org/) `>= 0.10`. To install, type this at the command line:
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```
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npm install relateurl --save-dev
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```
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### Options
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#### options.defaultPorts
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Type: `Object`
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Default value: `{ftp:21, http:80, https:443}`
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Extend the list with any ports you need. Any URLs containing these default ports will have them removed. Example: `http://example.com:80/` will become `http://example.com/`.
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#### options.directoryIndexes
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Type: `Array`
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Default value: `["index.html"]`
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Extend the list with any resources you need. Works with [`options.removeDirectoryIndexes`](#options.removeDirectoryIndexes).
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#### options.ignore_www
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Type: `Boolean`
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Default value: `false`
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This will, for example, consider any domains containing `http://www.example.com/` to be related to any that contain `http://example.com/`.
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#### options.output
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Type: constant or `String`
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Choices: `RelateUrl.ABSOLUTE`,`RelateUrl.PATH_RELATIVE`,`RelateUrl.ROOT_RELATIVE`,`RelateUrl.SHORTEST`
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Choices: `"absolute"`,`"pathRelative"`,`"rootRelative"`,`"shortest"`
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Default value: `RelateUrl.SHORTEST`
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`RelateUrl.ABSOLUTE` will produce an absolute URL. Overrides [`options.schemeRelative`](#options.schemeRelative) with a value of `false`.
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`RelateUrl.PATH_RELATIVE` will produce something like `../child-of-parent/etc/`.
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`RelateUrl.ROOT_RELATIVE` will produce something like `/child-of-root/etc/`.
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`RelateUrl.SHORTEST` will choose whichever is shortest between root- and path-relative.
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#### options.rejectedSchemes
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Type: `Array`
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Default value: `["data","javascript","mailto"]`
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Extend the list with any additional schemes. Example: `javascript:something` will not be modified.
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#### options.removeAuth
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Type: `Boolean`
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Default value: `false`
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Remove user authentication information from the output URL.
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#### options.removeDirectoryIndexes
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Type: `Boolean`
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Default value: `true`
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Remove any resources that match any found in [`options.directoryIndexes`](#options.directoryIndexes).
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#### options.removeEmptyQueries
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Type: `Boolean`
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Default value: `false`
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Remove empty query variables. Example: `http://domain.com/?var1&var2=&var3=asdf` will become `http://domain.com/?var3=adsf`. This does not apply to unrelated URLs (with other protocols, auths, hosts and/or ports).
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#### options.removeRootTrailingSlash
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Type: `Boolean`
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Default value: `true`
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Remove trailing slashes from root paths. Example: `http://domain.com/?var` will become `http://domain.com?var` while `http://domain.com/dir/?var` will not be modified.
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#### options.schemeRelative
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Type: `Boolean`
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Default value: `true`
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Output URLs relative to the scheme. Example: `http://example.com/` will become `//example.com/`.
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#### options.site
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Type: `String`
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Default value: `undefined`
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An options-based version of the [`from`](#examples) argument. If both are specified, `from` takes priority.
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#### options.slashesDenoteHost
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Type: `Boolean`
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Default value: `true`
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Passed to Node's [`url.parse`](http://nodejs.org/api/url.html#url_url_parse_urlstr_parsequerystring_slashesdenotehost).
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### Examples
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This library can be used as a [function for single-use](#single-instance) or as a [class for multiple conversions](#reusable-instances).
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Upon successful conversion, a `String` will be returned. If an issue is encountered while parsing `from`, an error will be thrown.
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#### Single Instance
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```js
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var RelateUrl = require("relateurl");
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var result = RelateUrl.relate(from, to, options);
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```
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#### Reusable Instances
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```js
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var RelateUrl = require("relateurl");
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var instance = new RelateUrl(from, options);
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var result1 = instance.relate(to1);
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var result2 = instance.relate(to2, customOptions);
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var result3 = instance.relate(to3);
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```
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## FAQ
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1. **Why bother writing/using this?**
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To aid in further minifying HTML, mainly for the purpose of faster page loads and SEO. It's been integrated into [HTMLMinifier](https://github.com/kangax/html-minifier).
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2. **Why not just use Node's `url.parse`, `url.resolve` and `path.relative`?**
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`url.parse` *is* used, but `url.resolve` and `path.relative` are both slower and less powerful than this library.
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## Release History
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* 0.2.7 Node v6 support
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* 0.2.6 minor enhancements
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* 0.2.5 added `options.removeRootTrailingSlash`
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* 0.2.4 added `options.site`
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* 0.2.3 added browserify npm-script
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* 0.2.2 removed task runner
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* 0.2.1 shorten resource- and query-relative URLs, test variations list with other site URLs
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* 0.2.0 code cleanup, `options.removeEmptyQueries=true` only applied to unrelated URLs
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* 0.1.0 initial release
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## Roadmap
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* 0.2.8 check if queries are the same, regardless of param order
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* 0.2.8 possible [scheme exclusions](http://www.iana.org/assignments/uri-schemes/uri-schemes.xhtml) such as `tel:`
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* 0.2.8 decipher and return invalid input (special cases) to complete test suite
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* 0.3.0 test `options.slashesDenoteHost=false`, add something like `options.externalDirectoryIndexes=[]` for external sites
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[npm-image]: https://img.shields.io/npm/v/relateurl.svg
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[npm-url]: https://npmjs.org/package/relateurl
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[travis-image]: https://img.shields.io/travis/stevenvachon/relateurl.svg
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[travis-url]: https://travis-ci.org/stevenvachon/relateurl
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[david-image]: https://img.shields.io/david/stevenvachon/relateurl.svg
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[david-url]: https://david-dm.org/stevenvachon/relateurl
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