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"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
}