File: index.js

package info (click to toggle)
node-columnify 1.5.4-3
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, sid
  • size: 29,684 kB
  • sloc: makefile: 9
file content (297 lines) | stat: -rw-r--r-- 9,408 bytes parent folder | download | duplicates (4)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
"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;

    var keysArray = Object.keys(Object(nextSource));
    for (var nextIndex = 0, len = keysArray.length; nextIndex < len; nextIndex++) {
      var nextKey = keysArray[nextIndex];
      try {
        var desc = Object.getOwnPropertyDescriptor(nextSource, nextKey);
        if (desc !== undefined && desc.enumerable)
          to[nextKey] = nextSource[nextKey];
      } catch (e) {
        if (!hasPendingException) {
          hasPendingException = true;
          pendingException = e;
        }
      }
    }

    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
}