2023-01

cmd/adventOfCode/main.go

@@ -5,6 +5,7 @@ import (
 	"os"
 	"strconv"
 
+	"git.rpjosh.de/RPJosh/go-logger"
 	"rpjosh.de/adventOfCode/internal/2023/day_01"
 	"rpjosh.de/adventOfCode/internal/2023/day_02"
 	"rpjosh.de/adventOfCode/internal/2023/day_03"
@@ -34,6 +35,13 @@ import (
 )
 
 func main() {
+
+	// Configure logger
+	logger.SetGlobalLogger(&logger.Logger{
+		Level: logger.LevelDebug,
+		File:  &logger.FileLogger{},
+	})
+
 	year := 2023
 	day := 1
 	if len(os.Args) >= 2 && os.Args[1] != "" {

go.mod

@@ -1,3 +1,8 @@
 module rpjosh.de/adventOfCode
 
 go 1.18
+
+require (
+	git.rpjosh.de/RPJosh/go-logger v1.3.2 // indirect
+	golang.org/x/sys v0.15.0 // indirect
+)

go.sum

@@ -0,0 +1,4 @@
+git.rpjosh.de/RPJosh/go-logger v1.3.2 h1:y8qFEBYeJzLLi6H7CpHHGb2pB0IyfHSG6m6o8TxL1uo=
+git.rpjosh.de/RPJosh/go-logger v1.3.2/go.mod h1:iD3KaRyOIkYMj7E+xFMn5uDVCzW1lSJQopz1Fl1+BSM=
+golang.org/x/sys v0.15.0 h1:h48lPFYpsTvQJZF4EKyI4aLHaev3CxivZmv7yZig9pc=
+golang.org/x/sys v0.15.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=

internal/2023/day_01/in.go

@@ -1,11 +1,80 @@
 package day_01
 
+import (
+	"fmt"
+	"regexp"
+	"strings"
+
+	"git.rpjosh.de/RPJosh/go-logger"
+	"rpjosh.de/adventOfCode/pkg/utils"
+)
+
 type Day struct{}
 
+// findFirstAndLastNumber finds the first and last occurence of a number by the given regex
+// expression for the number (within a match group).
+// If the found string value is present in the map, the mapped value is used
+func (d *Day) findFirstAndLastNumber(in string, regex string, stringMap map[string]int) int {
+	// Build regex to get the first and last number in the string (because of greediness we get the last number)
+	regexFirst := regexp.MustCompile(`^.*?` + regex + `.*`)
+	regexLast := regexp.MustCompile(`^.*` + regex)
+	count := 0
+
+	for _, val := range strings.Split(in, "\n") {
+		if val == "" {
+			continue
+		}
+
+		matchesFirst := regexFirst.FindStringSubmatch(val)
+		matchesLast := regexLast.FindStringSubmatch(val)
+
+		// We expect exactly at least one match
+		if len(matchesFirst) < 1 {
+			logger.Fatal("Failed to get at least one number (got %d): %q", len(matchesFirst), val)
+		}
+
+		str := d.replaceDigitByInt(matchesFirst[1], stringMap)
+		if len(matchesLast) > 1 {
+			str += d.replaceDigitByInt(matchesLast[1], stringMap)
+		}
+
+		count += utils.ToInt(str)
+	}
+
+	return count
+}
+
+func (d *Day) replaceDigitByInt(val string, stringMap map[string]int) string {
+	if v, exists := stringMap[val]; exists {
+		return fmt.Sprintf("%d", v)
+	}
+
+	return val
+}
+
 func (d *Day) Part1(in string) string {
-	return ""
+	return fmt.Sprintf("%d", d.findFirstAndLastNumber(in, `(\d)`, make(map[string]int)))
 }
 
 func (d *Day) Part2(in string) string {
-	return ""
+	digist := map[string]int{
+		"one":   1,
+		"two":   2,
+		"three": 3,
+		"four":  4,
+		"five":  5,
+		"six":   6,
+		"seven": 7,
+		"eight": 8,
+		"nine":  9,
+	}
+
+	// Build regex string by looping through all digists
+	regex := `(\d`
+	for k, _ := range digist {
+		regex += "|" + k
+	}
+	regex += ")"
+
+	return fmt.Sprintf("%d", d.findFirstAndLastNumber(in, regex, digist))
 }

pkg/utils/utils.go

@@ -9,6 +9,8 @@ import (
 	"strconv"
 	"strings"
 	"time"
+
+	"git.rpjosh.de/RPJosh/go-logger"
 )
 
 // Copies the given string to the clipboard.
@@ -87,7 +89,7 @@ func PrintError(format string, a ...any) {
 func ToInt(val string) int {
 	value, err := strconv.Atoi(val)
 	if err != nil {
-		PrintError("%s", err)
+		logger.Fatal("Failed to  convert %q to a number: %s", val, err)
 	}
 
 	return value