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Scala code for generating an ASCII table for a given data set. The implementation handles ANSI colours by depending on Fansi (https://github.com/lihaoyi/fansi) by Li Haoyi.
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import fansi.Str | |
import org.slf4j.LoggerFactory | |
import scala.util.Try | |
import scala.util.control.NonFatal | |
object TablePrinter { | |
val logger = LoggerFactory.getLogger(TablePrinter.getClass) | |
private val CellPadding = 2 | |
def format(t: Seq[Seq[Any]]) = | |
Try { | |
t match { | |
case Nil => "" | |
case _ => | |
val cellSizes = | |
t.map { | |
_.map { c => | |
Option(c).fold(0) { | |
case s: String => s.length | |
case fs: Str => fs.getChars.length | |
case a => a.toString.length | |
} + CellPadding | |
} | |
} | |
val colSizes = cellSizes.transpose.map(_.max) | |
val rows = t.map(r => formatRow(r, colSizes)) | |
formatRows(rowSeparator(colSizes), rows) | |
} | |
}.recover { | |
case NonFatal(ex) => | |
logger.error("There was an error formatting to a table string", ex) | |
"" | |
}.getOrElse("") | |
def formatRow(row: Seq[Any], colSizes: Seq[Int]) = { | |
val cells = row.zip(colSizes).map { | |
case (_, size: Int) if size == 0 => "" | |
case (item: fansi.Str, size) => | |
val sze = size - CellPadding | |
val diff = sze - item.getChars.length | |
val rightPadding = (0 until diff).map(_ => " ").mkString("") | |
(" %-" + sze + "s " + rightPadding).format(item) | |
case (item, size) => | |
(" %-" + (size - CellPadding) + "s ").format(item) | |
} | |
cells.mkString("|", "|", "|") | |
} | |
def formatRows(separator: String, rows: Seq[String]): String = | |
(separator :: rows.head :: separator :: rows.tail.toList ::: separator :: Nil) | |
.mkString("\n") | |
private def rowSeparator(colSizes: Seq[Int]) = | |
colSizes.map(s => "-" * s).mkString("+", "+", "+") | |
} |
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