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File Content: index.js

"use strict"

const wcwidth = require('./width')
const {
  padRight,
  padCenter,
  padLeft,
  splitIntoLines,
  splitLongWords,
  truncateString
} = require('./utils')

const DEFAULT_HEADING_TRANSFORM = key => key.toUpperCase()

const DEFAULT_DATA_TRANSFORM = (cell, column, index) => cell

const DEFAULTS = Object.freeze({
  maxWidth: Infinity,
  minWidth: 0,
  columnSplitter: ' ',
  truncate: false,
  truncateMarker: '…',
  preserveNewLines: false,
  paddingChr: ' ',
  showHeaders: true,
  headingTransform: DEFAULT_HEADING_TRANSFORM,
  dataTransform: DEFAULT_DATA_TRANSFORM
})

module.exports = function(items, options = {}) {

let columnConfigs = options.config || {}
  delete options.config // remove config so doesn't appear on every column.

let maxLineWidth = options.maxLineWidth || Infinity
  if (maxLineWidth === 'auto') maxLineWidth = process.stdout.columns || Infinity
  delete options.maxLineWidth // this is a line control option, don't pass it to column

// Option defaults inheritance:
  // options.config[columnName] => options => DEFAULTS
  options = mixin({}, DEFAULTS, options)

options.config = options.config || Object.create(null)

options.spacing = options.spacing || '\n' // probably useless
  options.preserveNewLines = !!options.preserveNewLines
  options.showHeaders = !!options.showHeaders;
  options.columns = options.columns || options.include // alias include/columns, prefer columns if supplied
  let columnNames = options.columns || [] // optional user-supplied columns to include

items = toArray(items, columnNames)

// if not suppled column names, automatically determine columns from data keys
  if (!columnNames.length) {
    items.forEach(function(item) {
      for (let columnName in item) {
        if (columnNames.indexOf(columnName) === -1) columnNames.push(columnName)
      }
    })
  }

// initialize column defaults (each column inherits from options.config)
  let columns = columnNames.reduce((columns, columnName) => {
    let column = Object.create(options)
    columns[columnName] = mixin(column, columnConfigs[columnName])
    return columns
  }, Object.create(null))

// sanitize column settings
  columnNames.forEach(columnName => {
    let column = columns[columnName]
    column.name = columnName
    column.maxWidth = Math.ceil(column.maxWidth)
    column.minWidth = Math.ceil(column.minWidth)
    column.truncate = !!column.truncate
    column.align = column.align || 'left'
  })

// sanitize data
  items = items.map(item => {
    let result = Object.create(null)
    columnNames.forEach(columnName => {
      // null/undefined -> ''
      result[columnName] = item[columnName] != null ? item[columnName] : ''
      // toString everything
      result[columnName] = '' + result[columnName]
      if (columns[columnName].preserveNewLines) {
        // merge non-newline whitespace chars
        result[columnName] = result[columnName].replace(/[^\S\n]/gmi, ' ')
      } else {
        // merge all whitespace chars
        result[columnName] = result[columnName].replace(/\s/gmi, ' ')
      }
    })
    return result
  })

// transform data cells
  columnNames.forEach(columnName => {
    let column = columns[columnName]
    items = items.map((item, index) => {
      let col = Object.create(column)
      item[columnName] = column.dataTransform(item[columnName], col, index)

let changedKeys = Object.keys(col)
      // disable default heading transform if we wrote to column.name
      if (changedKeys.indexOf('name') !== -1) {
        if (column.headingTransform !== DEFAULT_HEADING_TRANSFORM) return
        column.headingTransform = heading => heading
      }
      changedKeys.forEach(key => column[key] = col[key])
      return item
    })
  })

// add headers
  let headers = {}
  if(options.showHeaders) {
    columnNames.forEach(columnName => {
      let column = columns[columnName]

if(!column.showHeaders){
        headers[columnName] = '';
        return;
      }

headers[columnName] = column.headingTransform(column.name)
    })
    items.unshift(headers)
  }
  // get actual max-width between min & max
  // based on length of data in columns
  columnNames.forEach(columnName => {
    let column = columns[columnName]
    column.width = items
    .map(item => item[columnName])
    .reduce((min, cur) => {
      // if already at maxWidth don't bother testing
      if (min >= column.maxWidth) return min
      return Math.max(min, Math.min(column.maxWidth, Math.max(column.minWidth, wcwidth(cur))))
    }, 0)
  })

// split long words so they can break onto multiple lines
  columnNames.forEach(columnName => {
    let column = columns[columnName]
    items = items.map(item => {
      item[columnName] = splitLongWords(item[columnName], column.width, column.truncateMarker)
      return item
    })
  })

// wrap long lines. each item is now an array of lines.
  columnNames.forEach(columnName => {
    let column = columns[columnName]
    items = items.map((item, index) => {
      let cell = item[columnName]
      item[columnName] = splitIntoLines(cell, column.width)

// if truncating required, only include first line + add truncation char
      if (column.truncate && item[columnName].length > 1) {
        item[columnName] = splitIntoLines(cell, column.width - wcwidth(column.truncateMarker))
        let firstLine = item[columnName][0]
        if (!endsWith(firstLine, column.truncateMarker)) item[columnName][0] += column.truncateMarker
        item[columnName] = item[columnName].slice(0, 1)
      }
      return item
    })
  })

// recalculate column widths from truncated output/lines
  columnNames.forEach(columnName => {
    let column = columns[columnName]
    column.width = items.map(item => {
      return item[columnName].reduce((min, cur) => {
        if (min >= column.maxWidth) return min
        return Math.max(min, Math.min(column.maxWidth, Math.max(column.minWidth, wcwidth(cur))))
      }, 0)
    }).reduce((min, cur) => {
      if (min >= column.maxWidth) return min
      return Math.max(min, Math.min(column.maxWidth, Math.max(column.minWidth, cur)))
    }, 0)
  })

let rows = createRows(items, columns, columnNames, options.paddingChr) // merge lines into rows
  // conceive output
  return rows.reduce((output, row) => {
    return output.concat(row.reduce((rowOut, line) => {
      return rowOut.concat(line.join(options.columnSplitter))
    }, []))
  }, [])
  .map(line => truncateString(line, maxLineWidth))
  .join(options.spacing)
}

/**
 * Convert wrapped lines into rows with padded values.
 *
 * @param Array items data to process
 * @param Array columns column width settings for wrapping
 * @param Array columnNames column ordering
 * @return Array items wrapped in arrays, corresponding to lines
 */

function createRows(items, columns, columnNames, paddingChr) {
  return items.map(item => {
    let row = []
    let numLines = 0
    columnNames.forEach(columnName => {
      numLines = Math.max(numLines, item[columnName].length)
    })
    // combine matching lines of each rows
    for (let i = 0; i < numLines; i++) {
      row[i] = row[i] || []
      columnNames.forEach(columnName => {
        let column = columns[columnName]
        let val = item[columnName][i] || '' // || '' ensures empty columns get padded
        if (column.align === 'right') row[i].push(padLeft(val, column.width, paddingChr))
        else if (column.align === 'center' || column.align === 'centre') row[i].push(padCenter(val, column.width, paddingChr))
        else row[i].push(padRight(val, column.width, paddingChr))
      })
    }
    return row
  })
}

/**
 * Object.assign
 *
 * @return Object Object with properties mixed in.
 */

function mixin(...args) {
  if (Object.assign) return Object.assign(...args)
  return ObjectAssign(...args)
}

function ObjectAssign(target, firstSource) {
  "use strict";
  if (target === undefined || target === null)
    throw new TypeError("Cannot convert first argument to object");

var to = Object(target);

var hasPendingException = false;
  var pendingException;

for (var i = 1; i < arguments.length; i++) {
    var nextSource = arguments[i];
    if (nextSource === undefined || nextSource === null)
      continue;

if (hasPendingException)
      throw pendingException;
  }
  return to;
}

/**
 * Adapted from String.prototype.endsWith polyfill.
 */

function endsWith(target, searchString, position) {
  position = position || target.length;
  position = position - searchString.length;
  let lastIndex = target.lastIndexOf(searchString);
  return lastIndex !== -1 && lastIndex === position;
}

function toArray(items, columnNames) {
  if (Array.isArray(items)) return items
  let rows = []
  for (let key in items) {
    let item = {}
    item[columnNames[0] || 'key'] = key
    item[columnNames[1] || 'value'] = items[key]
    rows.push(item)
  }
  return rows
}

Name	Size	Permission
LICENSE	1076 bytes	0644
Makefile	128 bytes	0644
columnify.js	10150 bytes	0644
index.js	9408 bytes	0644
package.json	1102 bytes	0644
utils.js	4868 bytes	0644
width.js	140 bytes	0644