317 lines
10 KiB
JavaScript
317 lines
10 KiB
JavaScript
import { stringWidth } from './string-width/index.js';
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import { stripAnsi } from './strip-ansi/index.js';
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import { wrap } from './wrap-ansi/index.js';
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const align = {
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right: (str, width) => `${' '.repeat(Math.max(0, width - stringWidth(str)))}${str}`,
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center: (str, width) => `${' '.repeat(Math.max(0, width - stringWidth(str)) >> 1)}${str}`,
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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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export class UI {
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width;
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wrap;
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rows;
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constructor(opts) {
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this.width = opts.width;
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/* c8 ignore start */
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this.wrap = opts.wrap ?? true;
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/* c8 ignore stop */
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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 &&
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this.shouldApplyLayoutDSL(...args) &&
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typeof args[0] === 'string') {
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return this.applyLayoutDSL(args[0]);
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}
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const cols = Object.assign(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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}), { span: false });
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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 &&
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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 &&
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stringWidth(String(columns[0])) > leftColumnWidth) {
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leftColumnWidth = Math.min(Math.floor(this.width * 0.5), stringWidth(String(columns[0])));
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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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const row = this.rows[this.rows.length - 1];
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/* c8 ignore start */
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if (!row) {
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throw new Error('no rows found');
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}
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/* c8 ignore stop */
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return row;
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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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const [right = '', left = ''] = [
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noAnsi.match(/\s*$/)?.[0],
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noAnsi.match(/^\s*/)?.[0],
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];
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return [0, right.length, 0, left.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 column = row[c];
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const { width } = column; // the width with padding.
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const wrapWidth = this.negatePadding(column); // 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 (column.align && column.align !== 'left' && this.wrap) {
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const fn = align[column.align];
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ts = fn(ts.trim(), wrapWidth);
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if (stringWidth(ts) < wrapWidth) {
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/* c8 ignore start */
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const w = width || 0;
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/* c8 ignore stop */
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ts += ' '.repeat(w - 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 = column.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(column, ts, '| ');
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str += ts;
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str += addBorder(column, 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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const lastLine = lines[lines.length - 1];
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/* c8 ignore start */
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if (!lastLine) {
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throw new Error('last line not found');
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}
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/* c8 ignore stop */
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str = this.renderInline(str, lastLine);
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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 match = source.match(/^ */);
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/* c8 ignore start */
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const leadingWhitespace = match ? match[0].length : 0;
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/* c8 ignore stop */
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const target = previousLine.text;
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const targetTextWidth = stringWidth(target.trimEnd());
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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.trimEnd() +
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' '.repeat(leadingWhitespace - targetTextWidth) +
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source.trimStart());
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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), {
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hard: true,
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}).split('\n');
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}
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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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/* c8 ignore start */
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const rrow = rrows[r] ?? [];
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/* c8 ignore stop */
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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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/* c8 ignore start */
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let wrapWidth = col.width || 0;
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/* c8 ignore stop */
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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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/* c8 ignore start */
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const unsetWidth = unset ? Math.floor(remainingWidth / unset) : 0;
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/* c8 ignore stop */
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return widths.map((w, i) => {
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if (w === undefined) {
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/* c8 ignore start */
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const col = row[i] ?? { text: '', padding: [] };
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/* c8 ignore stop */
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return Math.max(unsetWidth, _minWidth(col));
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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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const 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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const _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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const getWindowWidth = () => {
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/* c8 ignore start */
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if (typeof process === 'object' &&
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process.stdout &&
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process.stdout.columns) {
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return process.stdout.columns;
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}
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return 80;
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};
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/* c8 ignore stop */
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export const cliui = (opts = {}) => new UI({
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/* c8 ignore start */
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width: opts?.width || getWindowWidth(),
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wrap: opts?.wrap,
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/* c8 ignore stop */
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});
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//# sourceMappingURL=index.js.map
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