1 files changed, 100 insertions, 0 deletions
diff --git a/internal/game/table.go b/internal/game/table.go
new file mode 100644
index 0000000..e3dad97
--- /dev/null
+++ b/internal/game/table.go
@@ -0,0 +1,100 @@
+package game
+
+import (
+	"fmt"
+	"strings"
+)
+
+type tableGlyphs struct {
+	topLeft, topSep, topRight       rune
+	side, colSep                    rune
+	sepLeft, sepCross, sepRight     rune
+	botLeft, botSep, botRight       rune
+	fillH, fillHSep                 rune
+}
+
+func tableGlyphSet(unicode bool) tableGlyphs {
+	if unicode {
+		return tableGlyphs{
+			topLeft: '╔', topSep: '╤', topRight: '╗', side: '║', colSep: '│',
+			sepLeft: '╟', sepCross: '┼', sepRight: '╢',
+			botLeft: '╚', botSep: '╧', botRight: '╝', fillH: '═', fillHSep: '─',
+		}
+	}
+	return tableGlyphs{
+		topLeft: '+', topSep: '+', topRight: '+', side: '|', colSep: '|',
+		sepLeft: '+', sepCross: '+', sepRight: '+',
+		botLeft: '+', botSep: '+', botRight: '+', fillH: '-', fillHSep: '-',
+	}
+}
+
+type Table struct {
+	Columns []string
+	Rows    [][]string
+}
+
+func (t *Table) Render(unicode bool) []string {
+	g := tableGlyphSet(unicode)
+
+	nCols := len(t.Columns)
+	if nCols == 0 {
+		return nil
+	}
+
+	colWidths := make([]int, nCols)
+	for i, h := range t.Columns {
+		colWidths[i] = len(h)
+	}
+	for _, row := range t.Rows {
+		for i, cell := range row {
+			if i >= nCols {
+				break
+			}
+			if len(cell) > colWidths[i] {
+				colWidths[i] = len(cell)
+			}
+		}
+	}
+
+	makeSep := func(left, cross, right rune, fill rune) string {
+		var b strings.Builder
+		b.WriteRune(left)
+		for i := 0; i < nCols; i++ {
+			if i > 0 {
+				b.WriteRune(cross)
+			}
+			b.WriteString(strings.Repeat(string(fill), colWidths[i]+2))
+		}
+		b.WriteRune(right)
+		return b.String()
+	}
+
+	makeRow := func(cells []string) string {
+		var b strings.Builder
+		b.WriteRune(g.side)
+		for i := 0; i < nCols; i++ {
+			if i > 0 {
+				b.WriteRune(g.colSep)
+			}
+			cell := ""
+			if i < len(cells) {
+				cell = cells[i]
+			}
+			b.WriteString(fmt.Sprintf(" %-*s ", colWidths[i], cell))
+		}
+		b.WriteRune(g.side)
+		return b.String()
+	}
+
+	var out []string
+
+	out = append(out, makeSep(g.topLeft, g.topSep, g.topRight, g.fillH))
+	out = append(out, makeRow(t.Columns))
+	out = append(out, makeSep(g.sepLeft, g.sepCross, g.sepRight, g.fillHSep))
+	for _, row := range t.Rows {
+		out = append(out, makeRow(row))
+	}
+	out = append(out, makeSep(g.botLeft, g.botSep, g.botRight, g.fillH))
+
+	return out
+}