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JamesIves e0c5ab92a5 Dependencies

2020-03-06 22:45:40 -05:00

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Table

Table

Produces a string that represents array data in a text table.

Features

Works with strings containing fullwidth characters.
Works with strings containing ANSI escape codes.
Configurable border characters.
Configurable content alignment per column.
Configurable content padding per column.
Configurable column width.
Text wrapping.

Install

npm install table

Usage

Table data is described using an array (rows) of array (cells).

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} drawHorizontalLine
 * @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~drawHorizontalLine} 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".

let config,
  data,
  output;

data = [
  ['0A', '0B', '0C'],
  ['1A', '1B', '1C'],
  ['2A', '2B', '2C']
];

config = {
  columns: {
    0: {
      alignment: 'left',
      width: 10
    },
    1: {
      alignment: 'center',
      width: 10
    },
    2: {
      alignment: 'right',
      width: 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.

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.

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.

let data,
  output,
  options;

data = [
  ['0A', '0B', '0C'],
  ['1A', '1B', '1C'],
  ['2A', '2B', '2C'],
  ['3A', '3B', '3C'],
  ['4A', '4B', '4C']
];

options = {
  /**
    * @typedef {function} drawHorizontalLine
    * @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 ║
╚════╧════╧════╝

Single Line Mode

Horizontal lines inside the table are not drawn.

import {
  table,
  getBorderCharacters
} from 'table';

const data = [
  ['-rw-r--r--', '1', 'pandorym', 'staff', '1529', 'May 23 11:25', 'LICENSE'],
  ['-rw-r--r--', '1', 'pandorym', 'staff', '16327', 'May 23 11:58', 'README.md'],
  ['drwxr-xr-x', '76', 'pandorym', 'staff', '2432', 'May 23 12:02', 'dist'],
  ['drwxr-xr-x', '634', 'pandorym', 'staff', '20288', 'May 23 11:54', 'node_modules'],
  ['-rw-r--r--', '1,', 'pandorym', 'staff', '525688', 'May 23 11:52', 'package-lock.json'],
  ['-rw-r--r--@', '1', 'pandorym', 'staff', '2440', 'May 23 11:25', 'package.json'],
  ['drwxr-xr-x', '27', 'pandorym', 'staff', '864', 'May 23 11:25', 'src'],
  ['drwxr-xr-x', '20', 'pandorym', 'staff', '640', 'May 23 11:25', 'test'],
];

const config = {
  singleLine: true
};

const output = table(data, config);
console.log(output);

╔═════════════╤═════╤══════════╤═══════╤════════╤══════════════╤═══════════════════╗
║ -rw-r--r--  │ 1   │ pandorym │ staff │ 1529   │ May 23 11:25 │ LICENSE           ║
║ -rw-r--r--  │ 1   │ pandorym │ staff │ 16327  │ May 23 11:58 │ README.md         ║
║ drwxr-xr-x  │ 76  │ pandorym │ staff │ 2432   │ May 23 12:02 │ dist              ║
║ drwxr-xr-x  │ 634 │ pandorym │ staff │ 20288  │ May 23 11:54 │ node_modules      ║
║ -rw-r--r--  │ 1,  │ pandorym │ staff │ 525688 │ May 23 11:52 │ package-lock.json ║
║ -rw-r--r--@ │ 1   │ pandorym │ staff │ 2440   │ May 23 11:25 │ package.json      ║
║ drwxr-xr-x  │ 27  │ pandorym │ staff │ 864    │ May 23 11:25 │ src               ║
║ drwxr-xr-x  │ 20  │ pandorym │ staff │ 640    │ May 23 11:25 │ test              ║
╚═════════════╧═════╧══════════╧═══════╧════════╧══════════════╧═══════════════════╝

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.

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.

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 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.

let output;

output = table(data, {
    border: getBorderCharacters(`void`),
    columnDefault: {
        paddingLeft: 0,
        paddingRight: 1
    },
    drawHorizontalLine: () => {
        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.

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.

Streaming supports all of the configuration properties and functionality of a static table (such as auto text wrapping, alignment and padding), e.g.

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. 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.

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.

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.

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.        ║
╚══════════════════════╝

18 KiB Raw Blame History