Table formatting helper for console outputs https://twitter.com/luke_pighetti/status/1303736288315572224

table.dart

import 'dart:math';

class Table {
  /// Example output
  ///
  /// ```
  ///   Range  (yd)     10,     20,     30,     40,     50,     60,     70,     80,     90,    100
  ///    Drop  (in)  -0.51,   0.06,   0.23,  -0.03,  -0.71,  -1.84,  -3.42,  -5.46,  -7.98, -10.99
  ///    Drop (moa)   4.78,  -0.31,  -0.73,   0.06,   1.35,   2.92,   4.65,   6.51,   8.45,  10.48
  /// Windage  (in)   0.03,   0.05,   0.09,   0.15,   0.22,   0.31,   0.41,   0.53,   0.66,   0.81
  /// Windage (moa)   0.27,   0.25,   0.29,   0.35,   0.42,   0.49,   0.56,   0.63,   0.70,   0.78
  /// ```
  Table(this.rows)
      : assert(rows.every((row) => row.cells.length == rows.first.cells.length),
            'Every row needs the same number of cells');

  final List<Row> rows;

  int get maxTitleLength =>
      rows.fold(0, (last, row) => max(row.title.length, last));

  int get maxUnitLength =>
      rows.fold(0, (last, row) => max(row.unit.length, last));

  int get maxCellWidth {
    var width = 0;

    for (var row in rows) {
      for (var cell in row.cells) {
        width = max(width, cell.toString().length);
      }
    }

    return width;
  }

  @override
  String toString() {
    return rows
        .map((e) => e.format(maxTitleLength, maxUnitLength, maxCellWidth))
        .join('\n');
  }
}

class Row {
  /// A row to be formatted within a [Table]
  Row(this.title, this.unit, this.cells);

  final String title;
  final String unit;
  final Iterable<dynamic> cells;

  String format(int maxTitleLength, int maxUnitLength, int maxCellWidth) {
    final formattedTitle = title.padLeft(maxTitleLength);
    final formattedUnit = '($unit)'.padLeft(maxUnitLength + 2);
    final formattedCells = cells.map((e) => '$e'.padLeft(maxCellWidth));

    return '$formattedTitle $formattedUnit ${formattedCells.join(", ")}';
  }
}