DO nor re-run up-to-date tasks, based on ModTime and given patterns

file.go

@@ -0,0 +1,53 @@
+package task
+
+import (
+	"os"
+	"time"
+
+	"github.com/mattn/go-zglob"
+)
+
+var dirsToSkip = []string{
+	".git",
+	"node_modules",
+}
+
+func minTime(pattern string) (minTime time.Time, err error) {
+	files, err := zglob.Glob(pattern)
+	if err != nil {
+		return time.Time{}, err
+	}
+
+	for _, f := range files {
+		info, err := os.Stat(f)
+		if err != nil {
+			return time.Time{}, err
+		}
+
+		modTime := info.ModTime()
+		if minTime.IsZero() || modTime.Before(minTime) {
+			minTime = modTime
+		}
+	}
+	return
+}
+
+func maxTime(pattern string) (maxTime time.Time, err error) {
+	files, err := zglob.Glob(pattern)
+	if err != nil {
+		return time.Time{}, err
+	}
+
+	for _, f := range files {
+		info, err := os.Stat(f)
+		if err != nil {
+			return time.Time{}, err
+		}
+
+		modTime := info.ModTime()
+		if modTime.After(maxTime) {
+			maxTime = modTime
+		}
+	}
+	return
+}