var stringWidth = require('string-width')
var stripAnsi = require('strip-ansi')
var wrap = require('wrap-ansi')
var align = {
  right: alignRight,
  center: alignCenter
}
var top = 0
var right = 1
var bottom = 2
var left = 3

function UI (opts) {
  this.width = opts.width
  this.wrap = opts.wrap
  this.rows = []
}

UI.prototype.span = function () {
  var cols = this.div.apply(this, arguments)
  cols.span = true
}

UI.prototype.resetOutput = function () {
  this.rows = []
}

UI.prototype.div = function () {
  if (arguments.length === 0) this.div('')
  if (this.wrap && this._shouldApplyLayoutDSL.apply(this, arguments)) {
    return this._applyLayoutDSL(arguments[0])
  }

  var cols = []

  for (var i = 0, arg; (arg = arguments[i]) !== undefined; i++) {
    if (typeof arg === 'string') cols.push(this._colFromString(arg))
    else cols.push(arg)
  }

  this.rows.push(cols)
  return cols
}

UI.prototype._shouldApplyLayoutDSL = function () {
  return arguments.length === 1 && typeof arguments[0] === 'string' &&
    /[\t\n]/.test(arguments[0])
}

UI.prototype._applyLayoutDSL = function (str) {
  var _this = this
  var rows = str.split('\n')
  var leftColumnWidth = 0

  // simple heuristic for layout, make sure the
  // second column lines up along the left-hand.
  // don't allow the first column to take up more
  // than 50% of the screen.
  rows.forEach(function (row) {
    var columns = row.split('\t')
    if (columns.length > 1 && stringWidth(columns[0]) > leftColumnWidth) {
      leftColumnWidth = Math.min(
        Math.floor(_this.width * 0.5),
        stringWidth(columns[0])
      )
    }
  })

  // generate a table:
  //  replacing ' ' with padding calculations.
  //  using the algorithmically generated width.
  rows.forEach(function (row) {
    var columns = row.split('\t')
    _this.div.apply(_this, columns.map(function (r, i) {
      return {
        text: r.trim(),
        padding: _this._measurePadding(r),
        width: (i === 0 && columns.length > 1) ? leftColumnWidth : undefined
      }
    }))
  })

  return this.rows[this.rows.length - 1]
}

UI.prototype._colFromString = function (str) {
  return {
    text: str,
    padding: this._measurePadding(str)
  }
}

UI.prototype._measurePadding = function (str) {
  // measure padding without ansi escape codes
  var noAnsi = stripAnsi(str)
  return [0, noAnsi.match(/\s*$/)[0].length, 0, noAnsi.match(/^\s*/)[0].length]
}

UI.prototype.toString = function () {
  var _this = this
  var lines = []

  _this.rows.forEach(function (row, i) {
    _this.rowToString(row, lines)
  })

  // don't display any lines with the
  // hidden flag set.
  lines = lines.filter(function (line) {
    return !line.hidden
  })

  return lines.map(function (line) {
    return line.text
  }).join('\n')
}

UI.prototype.rowToString = function (row, lines) {
  var _this = this
  var padding
  var rrows = this._rasterize(row)
  var str = ''
  var ts
  var width
  var wrapWidth

  rrows.forEach(function (rrow, r) {
    str = ''
    rrow.forEach(function (col, c) {
      ts = '' // temporary string used during alignment/padding.
      width = row[c].width // the width with padding.
      wrapWidth = _this._negatePadding(row[c]) // the width without padding.

      ts += col

      for (var i = 0; i < wrapWidth - stringWidth(col); i++) {
        ts += ' '
      }

      // align the string within its column.
      if (row[c].align && row[c].align !== 'left' && _this.wrap) {
        ts = align[row[c].align](ts, wrapWidth)
        if (stringWidth(ts) < wrapWidth) ts += new Array(width - stringWidth(ts)).join(' ')
      }

      // apply border and padding to string.
      padding = row[c].padding || [0, 0, 0, 0]
      if (padding[left]) str += new Array(padding[left] + 1).join(' ')
      str += addBorder(row[c], ts, '| ')
      str += ts
      str += addBorder(row[c], ts, ' |')
      if (padding[right]) str += new Array(padding[right] + 1).join(' ')

      // if prior row is span, try to render the
      // current row on the prior line.
      if (r === 0 && lines.length > 0) {
        str = _this._renderInline(str, lines[lines.length - 1])
      }
    })

    // remove trailing whitespace.
    lines.push({
      text: str.replace(/ +$/, ''),
      span: row.span
    })
  })

  return lines
}

function addBorder (col, ts, style) {
  if (col.border) {
    if (/[.']-+[.']/.test(ts)) return ''
    else if (ts.trim().length) return style
    else return '  '
  }
  return ''
}

// if the full 'source' can render in
// the target line, do so.
UI.prototype._renderInline = function (source, previousLine) {
  var leadingWhitespace = source.match(/^ */)[0].length
  var target = previousLine.text
  var targetTextWidth = stringWidth(target.trimRight())

  if (!previousLine.span) return source

  // if we're not applying wrapping logic,
  // just always append to the span.
  if (!this.wrap) {
    previousLine.hidden = true
    return target + source
  }

  if (leadingWhitespace < targetTextWidth) return source

  previousLine.hidden = true

  return target.trimRight() + new Array(leadingWhitespace - targetTextWidth + 1).join(' ') + source.trimLeft()
}

UI.prototype._rasterize = function (row) {
  var _this = this
  var i
  var rrow
  var rrows = []
  var widths = this._columnWidths(row)
  var wrapped

  // word wrap all columns, and create
  // a data-structure that is easy to rasterize.
  row.forEach(function (col, c) {
    // leave room for left and right padding.
    col.width = widths[c]
    if (_this.wrap) wrapped = wrap(col.text, _this._negatePadding(col), { hard: true }).split('\n')
    else wrapped = col.text.split('\n')

    if (col.border) {
      wrapped.unshift('.' + new Array(_this._negatePadding(col) + 3).join('-') + '.')
      wrapped.push("'" + new Array(_this._negatePadding(col) + 3).join('-') + "'")
    }

    // add top and bottom padding.
    if (col.padding) {
      for (i = 0; i < (col.padding[top] || 0); i++) wrapped.unshift('')
      for (i = 0; i < (col.padding[bottom] || 0); i++) wrapped.push('')
    }

    wrapped.forEach(function (str, r) {
      if (!rrows[r]) rrows.push([])

      rrow = rrows[r]

      for (var i = 0; i < c; i++) {
        if (rrow[i] === undefined) rrow.push('')
      }
      rrow.push(str)
    })
  })

  return rrows
}

UI.prototype._negatePadding = function (col) {
  var wrapWidth = col.width
  if (col.padding) wrapWidth -= (col.padding[left] || 0) + (col.padding[right] || 0)
  if (col.border) wrapWidth -= 4
  return wrapWidth
}

UI.prototype._columnWidths = function (row) {
  var _this = this
  var widths = []
  var unset = row.length
  var unsetWidth
  var remainingWidth = this.width

  // column widths can be set in config.
  row.forEach(function (col, i) {
    if (col.width) {
      unset--
      widths[i] = col.width
      remainingWidth -= col.width
    } else {
      widths[i] = undefined
    }
  })

  // any unset widths should be calculated.
  if (unset) unsetWidth = Math.floor(remainingWidth / unset)
  widths.forEach(function (w, i) {
    if (!_this.wrap) widths[i] = row[i].width || stringWidth(row[i].text)
    else if (w === undefined) widths[i] = Math.max(unsetWidth, _minWidth(row[i]))
  })

  return widths
}

// calculates the minimum width of
// a column, based on padding preferences.
function _minWidth (col) {
  var padding = col.padding || []
  var minWidth = 1 + (padding[left] || 0) + (padding[right] || 0)
  if (col.border) minWidth += 4
  return minWidth
}

function getWindowWidth () {
  if (typeof process === 'object' && process.stdout && process.stdout.columns) return process.stdout.columns
}

function alignRight (str, width) {
  str = str.trim()
  var padding = ''
  var strWidth = stringWidth(str)

  if (strWidth < width) {
    padding = new Array(width - strWidth + 1).join(' ')
  }

  return padding + str
}

function alignCenter (str, width) {
  str = str.trim()
  var padding = ''
  var strWidth = stringWidth(str.trim())

  if (strWidth < width) {
    padding = new Array(parseInt((width - strWidth) / 2, 10) + 1).join(' ')
  }

  return padding + str
}

module.exports = function (opts) {
  opts = opts || {}

  return new UI({
    width: (opts || {}).width || getWindowWidth() || 80,
    wrap: typeof opts.wrap === 'boolean' ? opts.wrap : true
  })
}
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