Add files utils

files/query.go

@@ -0,0 +1,25 @@
+package files
+
+import (
+	"io/ioutil"
+	"time"
+)
+
+var epoch = time.Unix(1494505756, 0)
+
+func LatestFileIn(path string) (latest string) {
+	files, err := ioutil.ReadDir(path)
+	if err != nil {
+		return ""
+	}
+	latestTime := epoch
+	for _, f := range files {
+		path := f.Name()
+		pathModifiedAt := f.ModTime()
+		if pathModifiedAt.After(latestTime) {
+			latestTime = pathModifiedAt
+			latest = path
+		}
+	}
+	return
+}