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File Content: `utils.js`

"use strict"

var wcwidth = require('./width')

/**
 * repeat string `str` up to total length of `len`
 *
 * @param String str string to repeat
 * @param Number len total length of output string
 */

function repeatString(str, len) {
  return Array.apply(null, {length: len + 1}).join(str).slice(0, len)
}

/**
 * Pad `str` up to total length `max` with `chr`.
 * If `str` is longer than `max`, padRight will return `str` unaltered.
 *
 * @param String str string to pad
 * @param Number max total length of output string
 * @param String chr optional. Character to pad with. default: ' '
 * @return String padded str
 */

function padRight(str, max, chr) {
  str = str != null ? str : ''
  str = String(str)
  var length = max - wcwidth(str)
  if (length <= 0) return str
  return str + repeatString(chr || ' ', length)
}

/**
 * Pad `str` up to total length `max` with `chr`.
 * If `str` is longer than `max`, padCenter will return `str` unaltered.
 *
 * @param String str string to pad
 * @param Number max total length of output string
 * @param String chr optional. Character to pad with. default: ' '
 * @return String padded str
 */

function padCenter(str, max, chr) {
  str = str != null ? str : ''
  str = String(str)
  var length = max - wcwidth(str)
  if (length <= 0) return str
  var lengthLeft = Math.floor(length/2)
  var lengthRight = length - lengthLeft
  return repeatString(chr || ' ', lengthLeft) + str + repeatString(chr || ' ', lengthRight)
}

/**
 * Pad `str` up to total length `max` with `chr`, on the left.
 * If `str` is longer than `max`, padRight will return `str` unaltered.
 *
 * @param String str string to pad
 * @param Number max total length of output string
 * @param String chr optional. Character to pad with. default: ' '
 * @return String padded str
 */

function padLeft(str, max, chr) {
  str = str != null ? str : ''
  str = String(str)
  var length = max - wcwidth(str)
  if (length <= 0) return str
  return repeatString(chr || ' ', length) + str
}

/**
 * Split a String `str` into lines of maxiumum length `max`.
 * Splits on word boundaries. Preserves existing new lines.
 *
 * @param String str string to split
 * @param Number max length of each line
 * @return Array Array containing lines.
 */

function splitIntoLines(str, max) {
  function _splitIntoLines(str, max) {
    return str.trim().split(' ').reduce(function(lines, word) {
      var line = lines[lines.length - 1]
      if (line && wcwidth(line.join(' ')) + wcwidth(word) < max) {
        lines[lines.length - 1].push(word) // add to line
      }
      else lines.push([word]) // new line
      return lines
    }, []).map(function(l) {
      return l.join(' ')
    })
  }
  return str.split('\n').map(function(str) {
    return _splitIntoLines(str, max)
  }).reduce(function(lines, line) {
    return lines.concat(line)
  }, [])
}

/**
 * Add spaces and `truncationChar` between words of
 * `str` which are longer than `max`.
 *
 * @param String str string to split
 * @param Number max length of each line
 * @param Number truncationChar character to append to split words
 * @return String
 */

function splitLongWords(str, max, truncationChar) {
  str = str.trim()
  var result = []
  var words = str.split(' ')
  var remainder = ''

  var truncationWidth = wcwidth(truncationChar)

  while (remainder || words.length) {
    if (remainder) {
      var word = remainder
      remainder = ''
    } else {
      var word = words.shift()
    }

    if (wcwidth(word) > max) {
      // slice is based on length no wcwidth
      var i = 0
      var wwidth = 0
      var limit = max - truncationWidth
      while (i < word.length) {
        var w = wcwidth(word.charAt(i))
        if (w + wwidth > limit) {
          break
        }
        wwidth += w
        ++i
      }

      remainder = word.slice(i) // get remainder
      // save remainder for next loop

      word = word.slice(0, i) // grab truncated word
      word += truncationChar // add trailing … or whatever
    }
    result.push(word)
  }

  return result.join(' ')
}


/**
 * Truncate `str` into total width `max`
 * If `str` is shorter than `max`,  will return `str` unaltered.
 *
 * @param String str string to truncated
 * @param Number max total wcwidth of output string
 * @return String truncated str
 */

function truncateString(str, max) {

  str = str != null ? str : ''
  str = String(str)

  if(max == Infinity) return str

  var i = 0
  var wwidth = 0
  while (i < str.length) {
    var w = wcwidth(str.charAt(i))
    if(w + wwidth > max)
      break
    wwidth += w
    ++i
  }
  return str.slice(0, i)
}



/**
 * Exports
 */

module.exports.padRight = padRight
module.exports.padCenter = padCenter
module.exports.padLeft = padLeft
module.exports.splitIntoLines = splitIntoLines
module.exports.splitLongWords = splitLongWords
module.exports.truncateString = truncateString
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
File Content: utils.js

File Content: `utils.js`
