add halp package for printing infinite grids, which seems to be quite common. generics may be useful here oneday...

halp/halp.go

@@ -0,0 +1,3 @@
+// Package halp is a bunch of helpers for AOC specific debugging like printing
+// infinite grids (map[[2]int]<T> <- Go generics will be useful here...)
+package halp

halp/print-infinite-grid.go

@@ -0,0 +1,59 @@
+package halp
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/alexchao26/advent-of-code-go/mathy"
+)
+
+// PrintInfiniteGridStrings supports the type map[[2]int]string, determines the
+// bounds of that infinite grid, and consolidates it into a string AND PRINTS IT
+// zeroValChar should be one character, and replaces any grid coordinate NOT in
+// the infiniteGrid
+func PrintInfiniteGridStrings(infiniteGrid map[[2]int]string, zeroValChar string) {
+	// get bounds
+	var firstRow, lastRow, firstCol, lastCol int
+	for coord := range infiniteGrid {
+		firstRow = mathy.MinInt(firstRow, coord[0])
+		lastRow = mathy.MaxInt(lastRow, coord[0])
+		firstCol = mathy.MinInt(firstCol, coord[1])
+		lastCol = mathy.MaxInt(lastCol, coord[1])
+	}
+
+	var sb strings.Builder
+	for r := firstRow; r <= lastRow; r++ {
+		for c := firstCol; c <= lastCol; c++ {
+			coord := [2]int{r, c}
+			if val, ok := infiniteGrid[coord]; ok {
+				sb.WriteString(val)
+			} else {
+				sb.WriteString(zeroValChar)
+			}
+		}
+		sb.WriteString("\n")
+	}
+	fmt.Println(sb.String())
+}
+
+// convertMapBoolsToMapStrings is a helper function for printing map[[2]int]bool
+// The return map can be passed into PrintInfiniteGridStrings
+func convertMapBoolsToMapStrings(m map[[2]int]bool, trueChar, falseChar string) map[[2]int]string {
+	converted := map[[2]int]string{}
+
+	for k, v := range m {
+		if v {
+			converted[k] = trueChar
+		} else {
+			converted[k] = falseChar
+		}
+	}
+
+	return converted
+}
+
+// PrintInfiniteGridBools supports the type map[[2]int]bool
+func PrintInfiniteGridBools(m map[[2]int]bool, trueChar, falseChar string) {
+	mapCoordsToStrings := convertMapBoolsToMapStrings(m, trueChar, falseChar)
+	PrintInfiniteGridStrings(mapCoordsToStrings, falseChar)
+}