June 2018 Update

Task/Calendar/Go/calendar.go

@@ -0,0 +1,71 @@
+package main
+
+import (
+	"fmt"
+	"time"
+)
+
+const pageWidth = 80
+
+func main() {
+	printCal(1969)
+}
+
+func printCal(year int) {
+	thisDate := time.Date(year, 1, 1, 1, 1, 1, 1, time.UTC)
+	var (
+		dayArr                  [12][7][6]int // month, weekday, week
+		month, lastMonth        time.Month
+		weekInMonth, dayInMonth int
+	)
+	for thisDate.Year() == year {
+		if month = thisDate.Month(); month != lastMonth {
+			weekInMonth = 0
+			dayInMonth = 1
+		}
+		weekday := thisDate.Weekday()
+		if weekday == 0 && dayInMonth > 1 {
+			weekInMonth++
+		}
+		dayArr[int(month)-1][weekday][weekInMonth] = thisDate.Day()
+		lastMonth = month
+		dayInMonth++
+		thisDate = thisDate.Add(time.Hour * 24)
+	}
+	centre := fmt.Sprintf("%d", pageWidth/2)
+	fmt.Printf("%"+centre+"s\n\n", "[SNOOPY]")
+	centre = fmt.Sprintf("%d", pageWidth/2-2)
+	fmt.Printf("%"+centre+"d\n\n", year)
+	months := [12]string{
+		" January ", " February", "  March  ", "  April  ",
+		"   May   ", "   June  ", "   July  ", "  August ",
+		"September", " October ", " November", " December"}
+	days := [7]string{"Su", "Mo", "Tu", "We", "Th", "Fr", "Sa"}
+	for qtr := 0; qtr < 4; qtr++ {
+		for monthInQtr := 0; monthInQtr < 3; monthInQtr++ { // Month names
+			fmt.Printf("      %s           ", months[qtr*3+monthInQtr])
+		}
+		fmt.Println()
+		for monthInQtr := 0; monthInQtr < 3; monthInQtr++ { // Day names
+			for day := 0; day < 7; day++ {
+				fmt.Printf(" %s", days[day])
+			}
+			fmt.Printf("     ")
+		}
+		fmt.Println()
+		for weekInMonth = 0; weekInMonth < 6; weekInMonth++ {
+			for monthInQtr := 0; monthInQtr < 3; monthInQtr++ {
+				for day := 0; day < 7; day++ {
+					if dayArr[qtr*3+monthInQtr][day][weekInMonth] == 0 {
+						fmt.Printf("   ")
+					} else {
+						fmt.Printf("%3d", dayArr[qtr*3+monthInQtr][day][weekInMonth])
+					}
+				}
+				fmt.Printf("     ")
+			}
+			fmt.Println()
+		}
+		fmt.Println()
+	}
+}