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_test.go

@@ -0,0 +1,66 @@
+package manager
+
+import (
+	"fmt"
+	"testing"
+)
+
+func TestExcludeFiles(t *testing.T) {
+
+	filenames := []string{
+		"/stash/videos/filename.mp4",
+		"/stash/videos/new filename.mp4",
+		"filename sample.mp4",
+		"/stash/videos/exclude/not wanted.webm",
+		"/stash/videos/exclude/not wanted2.webm",
+		"/somewhere/trash/not wanted.wmv",
+		"/disk2/stash/videos/exclude/!!wanted!!.avi",
+		"/disk2/stash/videos/xcl/not wanted.avi",
+		"/stash/videos/partial.file.001.webm",
+		"/stash/videos/partial.file.002.webm",
+		"/stash/videos/partial.file.003.webm",
+		"/stash/videos/sample file sample.mkv",
+		"/stash/videos/.ckRVp1/.still_encoding.mp4",
+		"c:\\stash\\videos\\exclude\\filename  windows.mp4",
+		"c:\\stash\\videos\\filename  windows.mp4",
+		"\\\\network\\videos\\filename  windows network.mp4",
+		"\\\\network\\share\\windows network wanted.mp4",
+		"\\\\network\\share\\windows network wanted sample.mp4",
+		"\\\\network\\private\\windows.network.skip.mp4"}
+
+	var excludeTests = []struct {
+		testPattern []string
+		expected    int
+	}{
+		{[]string{"sample\\.mp4$", "trash", "\\.[\\d]{3}\\.webm$"}, 6}, //generic
+		{[]string{"no_match\\.mp4"}, 0},                                //no match
+		{[]string{"^/stash/videos/exclude/", "/videos/xcl/"}, 3},       //linux
+		{[]string{"/\\.[[:word:]]+/"}, 1},                              //linux hidden dirs (handbrake unraid issue?)
+		{[]string{"c:\\\\stash\\\\videos\\\\exclude"}, 1},              //windows
+		{[]string{"\\/[/invalid"}, 0},                                  //invalid pattern
+		{[]string{"\\/[/invalid", "sample\\.[[:alnum:]]+$"}, 3},        //invalid pattern but continue
+		{[]string{"^\\\\\\\\network"}, 4},                              //windows net share
+		{[]string{"\\\\private\\\\"}, 1},                               //windows net share
+		{[]string{"\\\\private\\\\", "sample\\.mp4"}, 3},               //windows net share
+	}
+	for _, test := range excludeTests {
+		err := runExclude(filenames, test.testPattern, test.expected)
+		if err != nil {
+			t.Error(err)
+		}
+	}
+}
+
+func runExclude(filenames []string, patterns []string, expCount int) error {
+
+	files, count := excludeFiles(filenames, patterns)
+
+	if count != expCount {
+		return fmt.Errorf("Was expecting %d, found %d", expCount, count)
+	}
+	if len(files) != len(filenames)-expCount {
+		return fmt.Errorf("Returned list should have %d files, not %d ", len(filenames)-expCount, len(files))
+	}
+
+	return nil
+}