# Table
[](https://travis-ci.org/gajus/table)
[](https://www.npmjs.com/package/table)
[](https://github.com/gajus/canonical)
* [Table](#table)
* [Features](#table-features)
* [Usage](#table-usage)
* [Cell Content Alignment](#table-usage-cell-content-alignment)
* [Column Width](#table-usage-column-width)
* [Custom Border](#table-usage-custom-border)
* [Draw Horizontal Line](#table-usage-draw-horizontal-line)
* [Padding Cell Content](#table-usage-padding-cell-content)
* [Predefined Border Templates](#table-usage-predefined-border-templates)
* [Streaming](#table-usage-streaming)
* [Text Truncation](#table-usage-text-truncation)
* [Text Wrapping](#table-usage-text-wrapping)
Produces a string that represents array data in a text table.
## Features
* Works with strings containing [fullwidth](https://en.wikipedia.org/wiki/Halfwidth_and_fullwidth_forms) characters.
* Works with strings containing [ANSI escape codes](https://en.wikipedia.org/wiki/ANSI_escape_code).
* Configurable border characters.
* Configurable content alignment per column.
* Configurable content padding per column.
* Configurable column width.
* Text wrapping.
## Usage
Table data is described using an array (rows) of array (cells).
```js
import {
table
} from 'table';
// Using commonjs?
// const {table} = require('table');
let data,
output;
data = [
['0A', '0B', '0C'],
['1A', '1B', '1C'],
['2A', '2B', '2C']
];
/**
* @typedef {string} table~cell
*/
/**
* @typedef {table~cell[]} table~row
*/
/**
* @typedef {Object} table~columns
* @property {string} alignment Cell content alignment (enum: left, center, right) (default: left).
* @property {number} width Column width (default: auto).
* @property {number} truncate Number of characters are which the content will be truncated (default: Infinity).
* @property {number} paddingLeft Cell content padding width left (default: 1).
* @property {number} paddingRight Cell content padding width right (default: 1).
*/
/**
* @typedef {Object} table~border
* @property {string} topBody
* @property {string} topJoin
* @property {string} topLeft
* @property {string} topRight
* @property {string} bottomBody
* @property {string} bottomJoin
* @property {string} bottomLeft
* @property {string} bottomRight
* @property {string} bodyLeft
* @property {string} bodyRight
* @property {string} bodyJoin
* @property {string} joinBody
* @property {string} joinLeft
* @property {string} joinRight
* @property {string} joinJoin
*/
/**
* Used to dynamically tell table whether to draw a line separating rows or not.
* The default behavior is to always return true.
*
* @typedef {function} drawJoin
* @param {number} index
* @param {number} size
* @return {boolean}
*/
/**
* @typedef {Object} table~config
* @property {table~border} border
* @property {table~columns[]} columns Column specific configuration.
* @property {table~columns} columnDefault Default values for all columns. Column specific settings overwrite the default values.
* @property {table~drawJoin} drawHorizontalLine
*/
/**
* Generates a text table.
*
* @param {table~row[]} rows
* @param {table~config} config
* @return {String}
*/
output = table(data);
console.log(output);
```
```
╔════╤════╤════╗
║ 0A │ 0B │ 0C ║
╟────┼────┼────╢
║ 1A │ 1B │ 1C ║
╟────┼────┼────╢
║ 2A │ 2B │ 2C ║
╚════╧════╧════╝
```
### Cell Content Alignment
`{string} config.columns[{number}].alignment` property controls content horizontal alignment within a cell.
Valid values are: "left", "right" and "center".
```js
let config,
data,
output;
data = [
['0A', '0B', '0C'],
['1A', '1B', '1C'],
['2A', '2B', '2C']
];
config = {
columns: {
0: {
alignment: 'left',
minWidth: 10
},
1: {
alignment: 'center',
minWidth: 10
},
2: {
alignment: 'right',
minWidth: 10
}
}
};
output = table(data, config);
console.log(output);
```
```
╔════════════╤════════════╤════════════╗
║ 0A │ 0B │ 0C ║
╟────────────┼────────────┼────────────╢
║ 1A │ 1B │ 1C ║
╟────────────┼────────────┼────────────╢
║ 2A │ 2B │ 2C ║
╚════════════╧════════════╧════════════╝
```
### Column Width
`{number} config.columns[{number}].width` property restricts column width to a fixed width.
```js
let data,
output,
options;
data = [
['0A', '0B', '0C'],
['1A', '1B', '1C'],
['2A', '2B', '2C']
];
options = {
columns: {
1: {
width: 10
}
}
};
output = table(data, options);
console.log(output);
```
```
╔════╤════════════╤════╗
║ 0A │ 0B │ 0C ║
╟────┼────────────┼────╢
║ 1A │ 1B │ 1C ║
╟────┼────────────┼────╢
║ 2A │ 2B │ 2C ║
╚════╧════════════╧════╝
```
### Custom Border
`{object} config.border` property describes characters used to draw the table border.
```js
let config,
data,
output;
data = [
['0A', '0B', '0C'],
['1A', '1B', '1C'],
['2A', '2B', '2C']
];
config = {
border: {
topBody: `─`,
topJoin: `┬`,
topLeft: `┌`,
topRight: `┐`,
bottomBody: `─`,
bottomJoin: `┴`,
bottomLeft: `└`,
bottomRight: `┘`,
bodyLeft: `│`,
bodyRight: `│`,
bodyJoin: `│`,
joinBody: `─`,
joinLeft: `├`,
joinRight: `┤`,
joinJoin: `┼`
}
};
output = table(data, config);
console.log(output);
```
```
┌────┬────┬────┐
│ 0A │ 0B │ 0C │
├────┼────┼────┤
│ 1A │ 1B │ 1C │
├────┼────┼────┤
│ 2A │ 2B │ 2C │
└────┴────┴────┘
```
### Draw Horizontal Line
`{function} config.drawHorizontalLine` property is a function that is called for every non-content row in the table. The result of the function `{boolean}` determines whether a row is drawn.
```js
let data,
output,
options;
data = [
['0A', '0B', '0C'],
['1A', '1B', '1C'],
['2A', '2B', '2C'],
['3A', '3B', '3C'],
['4A', '4B', '4C']
];
options = {
/**
* @typedef {function} drawJoin
* @param {number} index
* @param {number} size
* @return {boolean}
*/
drawHorizontalLine: (index, size) => {
return index === 0 || index === 1 || index === size - 1 || index === size;
}
};
output = table(data, options);
console.log(output);
```
```
╔════╤════╤════╗
║ 0A │ 0B │ 0C ║
╟────┼────┼────╢
║ 1A │ 1B │ 1C ║
║ 2A │ 2B │ 2C ║
║ 3A │ 3B │ 3C ║
╟────┼────┼────╢
║ 4A │ 4B │ 4C ║
╚════╧════╧════╝
```
### Padding Cell Content
`{number} config.columns[{number}].paddingLeft` and `{number} config.columns[{number}].paddingRight` properties control content padding within a cell. Property value represents a number of whitespaces used to pad the content.
```js
let config,
data,
output;
data = [
['0A', 'AABBCC', '0C'],
['1A', '1B', '1C'],
['2A', '2B', '2C']
];
config = {
columns: {
0: {
paddingLeft: 3
},
1: {
width: 2,
paddingRight: 3
}
}
};
output = table(data, config);
console.log(output);
```
```
╔══════╤══════╤════╗
║ 0A │ AA │ 0C ║
║ │ BB │ ║
║ │ CC │ ║
╟──────┼──────┼────╢
║ 1A │ 1B │ 1C ║
╟──────┼──────┼────╢
║ 2A │ 2B │ 2C ║
╚══════╧══════╧════╝
```
### Predefined Border Templates
You can load one of the predefined border templates using `getBorderCharacters` function.
```js
import {
table,
getBorderCharacters
} from 'table';
let config,
data;
data = [
['0A', '0B', '0C'],
['1A', '1B', '1C'],
['2A', '2B', '2C']
];
config = {
border: getBorderCharacters(`name of the template`)
};
table(data, config);
```
```
# honeywell
╔════╤════╤════╗
║ 0A │ 0B │ 0C ║
╟────┼────┼────╢
║ 1A │ 1B │ 1C ║
╟────┼────┼────╢
║ 2A │ 2B │ 2C ║
╚════╧════╧════╝
# norc
┌────┬────┬────┐
│ 0A │ 0B │ 0C │
├────┼────┼────┤
│ 1A │ 1B │ 1C │
├────┼────┼────┤
│ 2A │ 2B │ 2C │
└────┴────┴────┘
# ramac (ASCII; for use in terminals that do not support Unicode characters)
+----+----+----+
| 0A | 0B | 0C |
|----|----|----|
| 1A | 1B | 1C |
|----|----|----|
| 2A | 2B | 2C |
+----+----+----+
# void (no borders; see "bordless table" section of the documentation)
0A 0B 0C
1A 1B 1C
2A 2B 2C
```
Raise [an issue](https://github.com/gajus/table/issues) if you'd like to contribute a new border template.
#### Borderless Table
Simply using "void" border character template creates a table with a lot of unnecessary spacing.
To create a more plesant to the eye table, reset the padding and remove the joining rows, e.g.
```js
let output;
output = table(data, {
border: getBorderCharacters(`void`),
columnDefault: {
paddingLeft: 0,
paddingRight: 1
},
drawJoin: () => {
return false
}
});
console.log(output);
```
```
0A 0B 0C
1A 1B 1C
2A 2B 2C
```
### Streaming
`table` package exports `createStream` function used to draw a table and append rows.
`createStream` requires `{number} columnDefault.width` and `{number} columnCount` configuration properties.
```js
import {
createStream
} from 'table';
let config,
stream;
config = {
columnDefault: {
width: 50
},
columnCount: 1
};
stream = createStream(config);
setInterval(() => {
stream.write([new Date()]);
}, 500);
```
`table` package uses ANSI escape codes to overwrite the output of the last line when a new row is printed.
The underlying implementation is explained in this [Stack Overflow answer](http://stackoverflow.com/a/32938658/368691).
Streaming supports all of the configuration properties and functionality of a static table (such as auto text wrapping, alignment and padding), e.g.
```js
import {
createStream
} from 'table';
import _ from 'lodash';
let config,
stream,
i;
config = {
columnDefault: {
width: 50
},
columnCount: 3,
columns: {
0: {
width: 10,
alignment: 'right'
},
1: {
alignment: 'center',
},
2: {
width: 10
}
}
};
stream = createStream(config);
i = 0;
setInterval(() => {
let random;
random = _.sample('abcdefghijklmnopqrstuvwxyz', _.random(1, 30)).join('');
stream.write([i++, new Date(), random]);
}, 500);
```
### Text Truncation
To handle a content that overflows the container width, `table` package implements [text wrapping](#table-usage-text-wrapping). However, sometimes you may want to truncate content that is too long to be displayed in the table.
`{number} config.columns[{number}].truncate` property (default: `Infinity`) truncates the text at the specified length.
```js
let config,
data,
output;
data = [
['Lorem ipsum dolor sit amet, consectetur adipiscing elit. Phasellus pulvinar nibh sed mauris convallis dapibus. Nunc venenatis tempus nulla sit amet viverra.']
];
config = {
columns: {
0: {
width: 20,
truncate: 100
}
}
};
output = table(data, config);
console.log(output);
```
```
╔══════════════════════╗
║ Lorem ipsum dolor si ║
║ t amet, consectetur ║
║ adipiscing elit. Pha ║
║ sellus pulvinar nibh ║
║ sed mauris conva... ║
╚══════════════════════╝
```
### Text Wrapping
`table` package implements auto text wrapping, i.e. text that has width greater than the container width will be separated into multiple lines, e.g.
```js
let config,
data,
output;
data = [
['Lorem ipsum dolor sit amet, consectetur adipiscing elit. Phasellus pulvinar nibh sed mauris convallis dapibus. Nunc venenatis tempus nulla sit amet viverra.']
];
config = {
columns: {
0: {
width: 20
}
}
};
output = table(data, config);
console.log(output);
```
```
╔══════════════════════╗
║ Lorem ipsum dolor si ║
║ t amet, consectetur ║
║ adipiscing elit. Pha ║
║ sellus pulvinar nibh ║
║ sed mauris convallis ║
║ dapibus. Nunc venena ║
║ tis tempus nulla sit ║
║ amet viverra. ║
╚══════════════════════╝
```
When `wrapWord` is `true` the text is broken at the nearest space or one of the special characters ("-", "_", "\", "/", ".", ",", ";"), e.g.
```js
let config,
data,
output;
data = [
['Lorem ipsum dolor sit amet, consectetur adipiscing elit. Phasellus pulvinar nibh sed mauris convallis dapibus. Nunc venenatis tempus nulla sit amet viverra.']
];
config = {
columns: {
0: {
width: 20,
wrapWord: true
}
}
};
output = table(data, config);
console.log(output);
```
```
╔══════════════════════╗
║ Lorem ipsum dolor ║
║ sit amet, ║
║ consectetur ║
║ adipiscing elit. ║
║ Phasellus pulvinar ║
║ nibh sed mauris ║
║ convallis dapibus. ║
║ Nunc venenatis ║
║ tempus nulla sit ║
║ amet viverra. ║
╚══════════════════════╝
```