Refactor

Signed-off-by: Oliver Davies <oliver@oliverdavies.uk>

internal/zet/get.go

@@ -0,0 +1,48 @@
+package zet
+
+import (
+	"log"
+	"regexp"
+	"sort"
+	"strconv"
+
+	"code.oliverdavies.uk/opdavies/cmd-zet/internal/git"
+)
+
+func GetAllZets() []int {
+	zets, err := git.ExecGitCommand("ls-files")
+
+	if err != nil {
+		log.Println(err)
+	}
+
+	re := regexp.MustCompile(`[0-9]+`)
+	matches := re.FindAllString(zets, -1)
+
+	sort.Strings(matches)
+
+	ids := make(map[int]struct{})
+	for _, id := range matches {
+		num, err := strconv.Atoi(id)
+
+		if err == nil {
+			ids[num] = struct{}{}
+		}
+	}
+
+	var sorted []int
+	for num := range ids {
+		sorted = append(sorted, num)
+	}
+
+	sort.Ints(sorted)
+
+	return sorted
+}
+
+func GetLatestZet() int {
+	z := GetAllZets()
+
+	return z[len(z)-1]
+}
+