mirror of https://github.com/jkjoy/sunpeiwen.git
237 lines
5.6 KiB
Markdown
237 lines
5.6 KiB
Markdown
# align-text [](http://badge.fury.io/js/align-text) [](https://travis-ci.org/jonschlinkert/align-text)
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> Align the text in a string.
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**Examples**
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Align text values in an array:
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```js
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align([1, 2, 3, 100]);
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//=> [' 1', ' 2', ' 3', '100']
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```
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Or [do stuff like this](./example.js):
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[](./example.js)
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Visit [the example](./example.js) to see how this works.
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## Install
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Install with [npm](https://www.npmjs.com/)
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```sh
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$ npm i align-text --save
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```
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## Usage
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```js
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var align = require('align-text');
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align(text, callback_function_or_integer);
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```
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**Params**
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* `text` can be a **string or array**. If a string is passed, a string will be returned. If an array is passed, an array will be returned.
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* `callback|integer`: if an integer, the text will be indented by that amount. If a function, it must return an integer representing the amount of leading indentation to use as `align` loops over each line.
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**Example**
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```js
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align(text, 4);
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```
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Would align:
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```
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abc
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abc
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abc
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```
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To:
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```
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abc
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abc
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abc
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```
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## callback
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### params
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The callback is used to determine the indentation of each line and gets the following params:
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* `len` the length of the "current" line
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* `longest` the length of the longest line
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* `line` the current line (string) being aligned
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* `lines` the array of all lines
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### return
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The callback may return:
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* an integer that represents the number of spaces to use for padding,
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* or an object with the following properties:
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- `indent`: **{Number}** the amount of indentation to use. Default is `0` when an object is returned.
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- `character`: **{String}** the character to use for indentation. Default is `''` (empty string) when an object is returned.
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- `prefix`: **{String}** leading characters to use at the beginning of each line. `''` (empty string) when an object is returned.
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**Integer example:**
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```js
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// calculate half the difference between the length
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// of the current line and the longest line
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function centerAlign(len, longest, line, lines) {
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return Math.floor((longest - len) / 2);
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}
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```
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**Object example:**
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```js
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function centerAlign(len, longest, line, lines) {
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return {
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character: '\t',
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indent: Math.floor((longest - len) / 2),
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prefix: '~ ',
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}
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}
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```
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## Usage examples
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### Center align
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Using the `centerAlign` function from above:
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```js
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align(text, centerAlign);
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```
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Would align this text:
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```js
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Lorem ipsum dolor sit amet
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consectetur adipiscin
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elit, sed do eiusmod tempor incididun
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ut labore et dolor
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magna aliqua. Ut enim ad mini
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veniam, quis
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```
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Resulting in this:
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```
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Lorem ipsum dolor sit amet,
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consectetur adipiscing
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elit, sed do eiusmod tempor incididunt
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ut labore et dolore
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magna aliqua. Ut enim ad minim
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veniam, quis
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```
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**Customize**
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If you wanted to add more padding on the left, just pass the number in the callback.
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For example, to add 4 spaces before every line:
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```js
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function centerAlign(len, longest, line, lines) {
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return 4 + Math.floor((longest - len) / 2);
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}
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```
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Would result in:
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```
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Lorem ipsum dolor sit amet,
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consectetur adipiscing
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elit, sed do eiusmod tempor incididunt
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ut labore et dolore
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magna aliqua. Ut enim ad minim
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veniam, quis
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```
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### Bullets
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```js
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align(text, function (len, max, line, lines) {
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return {prefix: ' - '};
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});
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```
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Would return:
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```
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- Lorem ipsum dolor sit amet,
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- consectetur adipiscing
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- elit, sed do eiusmod tempor incididunt
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- ut labore et dolore
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- magna aliqua. Ut enim ad minim
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- veniam, quis
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```
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### Different indent character
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```js
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align(text, function (len, max, line, lines) {
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return {
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indent: Math.floor((max - len) / 2),
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character: '~',
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};
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});
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```
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Would return
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```
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~~~~~Lorem ipsum dolor sit amet,
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~~~~~~~~consectetur adipiscing
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elit, sed do eiusmod tempor incididunt
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~~~~~~~~~ut labore et dolore
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~~~~magna aliqua. Ut enim ad minim
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~~~~~~~~~~~~~veniam, quis
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```
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## Related projects
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* [center-align](https://github.com/jonschlinkert/center-align): Center-align the text in a string.
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* [justify](https://github.com/bahamas10/node-justify): Left or right (or both) justify text using a custom width and character
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* [longest](https://github.com/jonschlinkert/longest): Get the longest item in an array.
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* [right-align](https://github.com/jonschlinkert/right-align): Right-align the text in a string.
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* [repeat-string](https://github.com/jonschlinkert/repeat-string): Repeat the given string n times. Fastest implementation for repeating a string.
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* [word-wrap](https://github.com/jonschlinkert/word-wrap): Wrap words to a specified length.
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## Running tests
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Install dev dependencies:
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```sh
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$ npm i -d && npm test
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```
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## Contributing
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Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](https://github.com/jonschlinkert/align-text/issues/new)
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## Author
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**Jon Schlinkert**
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+ [github/jonschlinkert](https://github.com/jonschlinkert)
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+ [twitter/jonschlinkert](http://twitter.com/jonschlinkert)
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## License
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Copyright © 2015 [Jon Schlinkert](https://github.com/jonschlinkert)
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Released under the MIT license.
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***
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_This file was generated by [verb-cli](https://github.com/assemble/verb-cli) on June 09, 2015._
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