Bug fix: Image caching (#172)

src/internal/imgcache/tools.go

@@ -0,0 +1,34 @@
+package imgcache
+
+import (
+  "crypto/md5"
+  "encoding/hex"
+)
+
+func strToMD5(str string) string {
+  md5Hasher := md5.New()
+  md5Hasher.Write([]byte(str))
+  return hex.EncodeToString(md5Hasher.Sum(nil))
+}
+
+func indexOfString(str string, slice []string) int {
+
+  for i, v := range slice {
+    if str == v {
+      return i
+    }
+  }
+
+  return -1
+}
+
+func removeStringFromSlice(str string, slice []string) []string {
+
+  var i = indexOfString(str, slice)
+
+  if i != -1 {
+    slice = append(slice[:i], slice[i+1:]...)
+  }
+
+  return slice
+}