restructure d05

d05.go

@@ -28,26 +28,22 @@ type mapping struct {
     val []mapval
 }
 
-func main() {
-	f, _ := os.Open(os.Args[1])
-	s := bufio.NewScanner(f)
+func parse(f *os.File) (seeds []uint64, maps []mapping) {
+    s := bufio.NewScanner(f)
 
-    var maps []mapping
-
-    var init_seeds []uint64
     inmap := false
     var curmap mapping
-	for s.Scan() {
+    for s.Scan() {
         line := s.Text()
-		switch {
-		case strings.HasPrefix(line, "seeds: "):
-			thing := strings.Split(line[7:], " ")
+        switch {
+        case strings.HasPrefix(line, "seeds: "):
+            thing := strings.Split(line[7:], " ")
             for _, v := range thing {
                 val, _ := strconv.ParseUint(v, 0, 64)
-                init_seeds = append(init_seeds, val)
+                seeds = append(seeds, val)
             }
 
-		case strings.HasSuffix(line, " map:"):
+        case strings.HasSuffix(line, " map:"):
             if inmap { maps = append(maps, curmap) }
             curmap = mapping{}
             inmap = true
@@ -67,10 +63,15 @@ func main() {
             val.cunt, _ = strconv.ParseUint(thing[2], 0, 64)
             curmap.val = append(curmap.val, val)
         }
-	}
+    }
     if inmap { maps = append(maps, curmap) }
 
+    return
+}
+
+func part1(init_seeds []uint64, maps []mapping) uint64 {
     seeds := append(make([]uint64, 0, len(init_seeds)), init_seeds...)
+
     currency := "seed"
     for currency != "location" {
         var map_cur mapping
@@ -97,22 +98,24 @@ func main() {
         }
     }
 
-    minloc := seeds[0]
+    min := seeds[0]
     for _, v := range seeds[1:] {
-        if v < minloc { minloc = v }
+        if v < min { min = v }
     }
-    fmt.Println(minloc)
+    return min
+}
 
-    seedrnge := make([]maprange, 0)
+func part2(init_seeds []uint64, maps []mapping) uint64 {
+    seeds := make([]maprange, 0)
     for i, _ := range init_seeds {
         if i % 2 == 1 { continue }
         var rnge maprange
         rnge.src = init_seeds[i + 0]
         rnge.dst = rnge.src + init_seeds[i + 1]
-        seedrnge = append(seedrnge, rnge)
+        seeds = append(seeds, rnge)
     }
 
-    currency = "seed"
+    currency := "seed"
     for currency != "location" {
         var map_cur mapping
         map_found := false
@@ -127,7 +130,7 @@ func main() {
 
         currency = map_cur.dir.dst
         newseedrnge := make([]maprange, 0)
-        for _, v := range seedrnge {
+        for _, v := range seeds {
             for _, x := range map_cur.val {
                 src := x.rnge.src
                 end := x.rnge.src + x.cunt
@@ -154,12 +157,20 @@ func main() {
             }
             if v.src != v.dst { newseedrnge = append(newseedrnge, v) }
         }
-        seedrnge = newseedrnge
+        seeds = newseedrnge
     }
 
-    minrnge := seedrnge[0].src
-    for _, v := range seedrnge[1:] {
+    minrnge := seeds[0].src
+    for _, v := range seeds[1:] {
         if v.src < minrnge { minrnge = v.src }
     }
-    fmt.Println(minrnge)
+    return minrnge
+}
+
+func main() {
+	f, _ := os.Open(os.Args[1])
+
+    seeds, maps := parse(f)
+    fmt.Println(part1(seeds, maps))
+    fmt.Println(part2(seeds, maps))
 }