355 lines
8.0 KiB
JavaScript
355 lines
8.0 KiB
JavaScript
'use strict'
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const stringWidth = require('string-width')
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const stripAnsi = require('strip-ansi')
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const wrap = require('wrap-ansi')
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const align = {
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right: alignRight,
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center: alignCenter
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}
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const top = 0
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const right = 1
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const bottom = 2
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const left = 3
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class UI {
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constructor (opts) {
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this.width = opts.width
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this.wrap = opts.wrap
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this.rows = []
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}
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span (...args) {
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const cols = this.div(...args)
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cols.span = true
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}
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resetOutput () {
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this.rows = []
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}
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div (...args) {
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if (args.length === 0) {
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this.div('')
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}
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if (this.wrap && this._shouldApplyLayoutDSL(...args)) {
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return this._applyLayoutDSL(args[0])
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}
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const cols = args.map(arg => {
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if (typeof arg === 'string') {
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return this._colFromString(arg)
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}
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return arg
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})
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this.rows.push(cols)
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return cols
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}
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_shouldApplyLayoutDSL (...args) {
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return args.length === 1 && typeof args[0] === 'string' &&
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/[\t\n]/.test(args[0])
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}
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_applyLayoutDSL (str) {
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const rows = str.split('\n').map(row => row.split('\t'))
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let leftColumnWidth = 0
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// simple heuristic for layout, make sure the
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// second column lines up along the left-hand.
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// don't allow the first column to take up more
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// than 50% of the screen.
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rows.forEach(columns => {
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if (columns.length > 1 && stringWidth(columns[0]) > leftColumnWidth) {
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leftColumnWidth = Math.min(
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Math.floor(this.width * 0.5),
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stringWidth(columns[0])
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)
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}
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})
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// generate a table:
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// replacing ' ' with padding calculations.
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// using the algorithmically generated width.
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rows.forEach(columns => {
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this.div(...columns.map((r, i) => {
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return {
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text: r.trim(),
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padding: this._measurePadding(r),
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width: (i === 0 && columns.length > 1) ? leftColumnWidth : undefined
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}
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}))
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})
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return this.rows[this.rows.length - 1]
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}
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_colFromString (text) {
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return {
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text,
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padding: this._measurePadding(text)
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}
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}
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_measurePadding (str) {
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// measure padding without ansi escape codes
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const noAnsi = stripAnsi(str)
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return [0, noAnsi.match(/\s*$/)[0].length, 0, noAnsi.match(/^\s*/)[0].length]
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}
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toString () {
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const lines = []
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this.rows.forEach(row => {
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this.rowToString(row, lines)
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})
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// don't display any lines with the
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// hidden flag set.
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return lines
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.filter(line => !line.hidden)
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.map(line => line.text)
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.join('\n')
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}
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rowToString (row, lines) {
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this._rasterize(row).forEach((rrow, r) => {
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let str = ''
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rrow.forEach((col, c) => {
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const { width } = row[c] // the width with padding.
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const wrapWidth = this._negatePadding(row[c]) // the width without padding.
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let ts = col // temporary string used during alignment/padding.
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if (wrapWidth > stringWidth(col)) {
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ts += ' '.repeat(wrapWidth - stringWidth(col))
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}
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// align the string within its column.
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if (row[c].align && row[c].align !== 'left' && this.wrap) {
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ts = align[row[c].align](ts, wrapWidth)
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if (stringWidth(ts) < wrapWidth) {
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ts += ' '.repeat(width - stringWidth(ts) - 1)
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}
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}
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// apply border and padding to string.
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const padding = row[c].padding || [0, 0, 0, 0]
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if (padding[left]) {
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str += ' '.repeat(padding[left])
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}
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str += addBorder(row[c], ts, '| ')
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str += ts
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str += addBorder(row[c], ts, ' |')
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if (padding[right]) {
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str += ' '.repeat(padding[right])
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}
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// if prior row is span, try to render the
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// current row on the prior line.
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if (r === 0 && lines.length > 0) {
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str = this._renderInline(str, lines[lines.length - 1])
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}
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})
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// remove trailing whitespace.
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lines.push({
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text: str.replace(/ +$/, ''),
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span: row.span
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})
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})
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return lines
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}
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// if the full 'source' can render in
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// the target line, do so.
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_renderInline (source, previousLine) {
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const leadingWhitespace = source.match(/^ */)[0].length
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const target = previousLine.text
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const targetTextWidth = stringWidth(target.trimRight())
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if (!previousLine.span) {
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return source
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}
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// if we're not applying wrapping logic,
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// just always append to the span.
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if (!this.wrap) {
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previousLine.hidden = true
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return target + source
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}
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if (leadingWhitespace < targetTextWidth) {
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return source
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}
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previousLine.hidden = true
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return target.trimRight() + ' '.repeat(leadingWhitespace - targetTextWidth) + source.trimLeft()
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}
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_rasterize (row) {
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const rrows = []
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const widths = this._columnWidths(row)
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let wrapped
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// word wrap all columns, and create
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// a data-structure that is easy to rasterize.
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row.forEach((col, c) => {
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// leave room for left and right padding.
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col.width = widths[c]
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if (this.wrap) {
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wrapped = wrap(col.text, this._negatePadding(col), { hard: true }).split('\n')
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} else {
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wrapped = col.text.split('\n')
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}
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if (col.border) {
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wrapped.unshift('.' + '-'.repeat(this._negatePadding(col) + 2) + '.')
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wrapped.push("'" + '-'.repeat(this._negatePadding(col) + 2) + "'")
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}
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// add top and bottom padding.
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if (col.padding) {
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wrapped.unshift(...new Array(col.padding[top] || 0).fill(''))
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wrapped.push(...new Array(col.padding[bottom] || 0).fill(''))
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}
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wrapped.forEach((str, r) => {
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if (!rrows[r]) {
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rrows.push([])
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}
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const rrow = rrows[r]
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for (let i = 0; i < c; i++) {
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if (rrow[i] === undefined) {
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rrow.push('')
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}
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}
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rrow.push(str)
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})
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})
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return rrows
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}
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_negatePadding (col) {
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let wrapWidth = col.width
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if (col.padding) {
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wrapWidth -= (col.padding[left] || 0) + (col.padding[right] || 0)
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}
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if (col.border) {
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wrapWidth -= 4
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}
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return wrapWidth
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}
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_columnWidths (row) {
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if (!this.wrap) {
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return row.map(col => {
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return col.width || stringWidth(col.text)
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})
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}
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let unset = row.length
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let remainingWidth = this.width
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// column widths can be set in config.
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const widths = row.map(col => {
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if (col.width) {
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unset--
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remainingWidth -= col.width
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return col.width
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}
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return undefined
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})
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// any unset widths should be calculated.
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const unsetWidth = unset ? Math.floor(remainingWidth / unset) : 0
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return widths.map((w, i) => {
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if (w === undefined) {
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return Math.max(unsetWidth, _minWidth(row[i]))
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}
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return w
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})
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}
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}
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function addBorder (col, ts, style) {
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if (col.border) {
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if (/[.']-+[.']/.test(ts)) {
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return ''
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}
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if (ts.trim().length !== 0) {
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return style
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}
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return ' '
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}
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return ''
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}
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// calculates the minimum width of
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// a column, based on padding preferences.
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function _minWidth (col) {
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const padding = col.padding || []
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const minWidth = 1 + (padding[left] || 0) + (padding[right] || 0)
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if (col.border) {
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return minWidth + 4
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}
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return minWidth
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}
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function getWindowWidth () {
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/* istanbul ignore next: depends on terminal */
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if (typeof process === 'object' && process.stdout && process.stdout.columns) {
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return process.stdout.columns
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}
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}
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function alignRight (str, width) {
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str = str.trim()
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const strWidth = stringWidth(str)
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if (strWidth < width) {
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return ' '.repeat(width - strWidth) + str
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}
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return str
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}
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function alignCenter (str, width) {
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str = str.trim()
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const strWidth = stringWidth(str)
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/* istanbul ignore next */
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if (strWidth >= width) {
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return str
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}
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return ' '.repeat((width - strWidth) >> 1) + str
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}
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module.exports = function (opts = {}) {
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return new UI({
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width: opts.width || getWindowWidth() || /* istanbul ignore next */ 80,
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wrap: opts.wrap !== false
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})
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}
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