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author | Florian Dold <florian.dold@gmail.com> | 2017-05-03 15:35:00 +0200 |
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committer | Florian Dold <florian.dold@gmail.com> | 2017-05-03 15:35:00 +0200 |
commit | de98e0b232509d5f40c135d540a70e415272ff85 (patch) | |
tree | a79222a5b58484ab3b80d18efcaaa7ccc4769b33 /node_modules/cliui/index.js | |
parent | e0c9d480a73fa629c1e4a47d3e721f1d2d345406 (diff) |
node_modules
Diffstat (limited to 'node_modules/cliui/index.js')
-rw-r--r-- | node_modules/cliui/index.js | 273 |
1 files changed, 273 insertions, 0 deletions
diff --git a/node_modules/cliui/index.js b/node_modules/cliui/index.js new file mode 100644 index 000000000..31b4aa7b7 --- /dev/null +++ b/node_modules/cliui/index.js @@ -0,0 +1,273 @@ +var wrap = require('wordwrap'), + align = { + right: require('right-align'), + center: require('center-align') + }, + top = 0, + right = 1, + bottom = 2, + 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.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, + rows = str.split('\n'), + 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 && columns[0].length > leftColumnWidth) { + leftColumnWidth = Math.min( + Math.floor(_this.width * 0.5), + columns[0].length + ) + } + }) + + // 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: [0, r.match(/\s*$/)[0].length, 0, r.match(/^\s*/)[0].length], + width: (i === 0 && columns.length > 1) ? leftColumnWidth : undefined + } + })) + }) + + return this.rows[this.rows.length - 1] +} + +UI.prototype._colFromString = function (str) { + return { + text: str + } +} + +UI.prototype.toString = function () { + var _this = this, + lines = [] + + _this.rows.forEach(function (row, i) { + _this.rowToString(row, lines) + }) + + // don't display any lines with the + // hidden flag set. + lines = lines.filter(function (line) { + return !line.hidden + }) + + return lines.map(function (line) { + return line.text + }).join('\n') +} + +UI.prototype.rowToString = function (row, lines) { + var _this = this, + paddingLeft, + rrows = this._rasterize(row), + str = '', + ts, + width, + wrapWidth + + rrows.forEach(function (rrow, r) { + str = '' + rrow.forEach(function (col, c) { + ts = '' // temporary string used during alignment/padding. + width = row[c].width // the width with padding. + wrapWidth = _this._negatePadding(row[c]) // the width without padding. + + for (var i = 0; i < Math.max(wrapWidth, col.length); i++) { + ts += col.charAt(i) || ' ' + } + + // align the string within its column. + if (row[c].align && row[c].align !== 'left' && _this.wrap) { + ts = align[row[c].align](ts.trim() + '\n' + new Array(wrapWidth + 1).join(' ')) + .split('\n')[0] + if (ts.length < wrapWidth) ts += new Array(width - ts.length).join(' ') + } + + // add left/right padding and print string. + paddingLeft = (row[c].padding || [0, 0, 0, 0])[left] + if (paddingLeft) str += new Array(row[c].padding[left] + 1).join(' ') + str += ts + if (row[c].padding && row[c].padding[right]) str += new Array(row[c].padding[right] + 1).join(' ') + + // if prior row is span, try to render the + // current row on the prior line. + if (r === 0 && lines.length > 0) { + str = _this._renderInline(str, lines[lines.length - 1], paddingLeft) + } + }) + + // remove trailing whitespace. + lines.push({ + text: str.replace(/ +$/, ''), + span: row.span + }) + }) + + return lines +} + +// if the full 'source' can render in +// the target line, do so. +UI.prototype._renderInline = function (source, previousLine, paddingLeft) { + var target = previousLine.text, + str = '' + + 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 + } + + for (var i = 0, tc, sc; i < Math.max(source.length, target.length); i++) { + tc = target.charAt(i) || ' ' + sc = source.charAt(i) || ' ' + // we tried to overwrite a character in the other string. + if (tc !== ' ' && sc !== ' ') return source + // there is not enough whitespace to maintain padding. + if (sc !== ' ' && i < paddingLeft + target.length) return source + // :thumbsup: + if (tc === ' ') str += sc + else str += tc + } + + previousLine.hidden = true + + return str +} + +UI.prototype._rasterize = function (row) { + var _this = this, + i, + rrow, + rrows = [], + widths = this._columnWidths(row), + 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.hard(_this._negatePadding(col))(col.text).split('\n') + else wrapped = col.text.split('\n') + + // 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) + return wrapWidth +} + +UI.prototype._columnWidths = function (row) { + var _this = this, + widths = [], + unset = row.length, + unsetWidth, + 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 || row[i].text.length + 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 || [] + + return 1 + (padding[left] || 0) + (padding[right] || 0) +} + +module.exports = function (opts) { + opts = opts || {} + + return new UI({ + width: (opts || {}).width || 80, + wrap: typeof opts.wrap === 'boolean' ? opts.wrap : true + }) +} |