Add exclude file from scan feature (#253)

* Added exclude file from scan feature

* Abort exclusion instead of panicking when pattern isn't valid

* Added UI configuration for exclude patterns

*   * cosmetic fixes
  * changed behavior of exclude function to continue and ignore invalide regex patterns
  * added some more tests (windows networks and continue after regex error)

pkg/manager/manager_tasks.go

@@ -2,7 +2,9 @@ package manager
 
 import (
 	"path/filepath"
+	"regexp"
 	"strconv"
+	"strings"
 	"sync"
 	"time"
 
@@ -78,6 +80,7 @@ func (s *singleton) Scan(useFileMetadata bool) {
 			return
 		}
 
+		results, _ = excludeFiles(results, config.GetExcludes())
 		total := len(results)
 		logger.Infof("Starting scan of %d files. %d New files found", total, s.neededScan(results))
 
@@ -492,3 +495,46 @@ func (s *singleton) neededGenerate(scenes []*models.Scene, sprites, previews, ma
 	}
 	return &totals
 }
+
+func excludeFiles(files []string, patterns []string) ([]string, int) {
+	if patterns == nil {
+		logger.Infof("No excludes in config.")
+		return files, 0
+	} else {
+		var results []string
+		var exclCount int
+		var fileRegexps []*regexp.Regexp
+
+		for _, pattern := range patterns {
+			reg, err := regexp.Compile(strings.ToLower(pattern))
+			if err != nil {
+				logger.Errorf("Exclude :%v", err)
+			} else {
+				fileRegexps = append(fileRegexps, reg)
+			}
+		}
+
+		if len(fileRegexps) == 0 {
+			return files, 0
+		}
+
+		for i := 0; i < len(files); i++ {
+			match := false
+			for _, regPattern := range fileRegexps {
+				if regPattern.Match([]byte(strings.ToLower(files[i]))) {
+					logger.Infof("File %s excluded from scan ", files[i])
+					match = true
+					exclCount++
+					break
+				}
+
+			}
+			//if pattern doesn't match add file to list
+			if !match {
+				results = append(results, files[i])
+			}
+		}
+		logger.Infof("Excluded %d file(s) from scan ", exclCount)
+		return results, exclCount
+	}
+}