Re-implement a solution for the first day 1 puzzle, move common code into a library package.

2018/day01.go

@@ -1,56 +0,0 @@
-package main
-
-import (
-	"bufio"
-	"fmt"
-	"os"
-	"strconv"
-)
-
-type Set map[int]struct{}
-
-// Provide a filename as input, get the result on stdout
-func main() {
-	x := 0
-	found := false
-	seen := Set{0: struct{}{}}
-
-	for {
-		x, found = ScanFrequencies(os.Args[1], &seen, x)
-		if found {
-			break
-		}
-		fmt.Println("All frequencies scanned, repeating...")
-	}
-
-	fmt.Println("Repeat frequency detected, calibration complete: ", x)
-}
-
-// ScanFrequencies iterates over a list of frequencies (provided as an open
-// file handle), compares against a list of frequencies already seen and a 'current' frequency counter,
-// and returns `true` when a duplicate frequency is found. Integer value returned is the new, adjusted frequency
-func ScanFrequencies(freqFile string, seen *Set, frequency int) (int, bool) {
-	file, err := os.Open(os.Args[1])
-	if err != nil {
-		panic(err)
-	}
-
-	duplicateFound := false
-	scanner := bufio.NewScanner(file)
-	for scanner.Scan() {
-		y, err := strconv.Atoi(scanner.Text())
-		if err != nil {
-			panic(err)
-		}
-		frequency += y
-		if _, ok := (*seen)[frequency]; ok {
-			duplicateFound = true
-			break
-		}
-
-		(*seen)[frequency] = struct{}{}
-	}
-
-	file.Close()
-	return frequency, duplicateFound
-}