Added argument to filter displayed results

README.md

@@ -36,11 +36,12 @@ Available Commands:
   version     Print version
 
 Flags:
-  -h, --help         help for roulette
-  -p, --port int     port to listen on (default 8080)
-  -r, --recursive    recurse into subdirectories
-  -s, --successive   load the next sequential file, if possible
-  -v, --verbose      log accessed files to stdout
+  -f, --filter string   only display images matching specified pattern (case-insensitive)
+  -h, --help            help for roulette
+  -p, --port int        port to listen on (default 8080)
+  -r, --recursive       recurse into subdirectories
+  -s, --successive      load the next sequential file, if possible
+  -v, --verbose         log accessed files to stdout
 
 Use "roulette [command] --help" for more information about a command.
 ```

cmd/files.go

@@ -12,11 +12,19 @@ import (
 	"path/filepath"
 	"regexp"
 	"strconv"
+	"strings"
 	"time"
 
 	"github.com/h2non/filetype"
 )
 
+func containsCaseIntensitive(a string, b string) bool {
+	return strings.Contains(
+		strings.ToLower(a),
+		strings.ToLower(b),
+	)
+}
+
 func getFirstFile(path string) (string, error) {
 	re := regexp.MustCompile(`(.+)([0-9]{3})(\..+)`)
 
@@ -107,9 +115,19 @@ func getFiles(path string) ([]string, error) {
 	var paths []string
 
 	err := filepath.WalkDir(path, func(p string, info os.DirEntry, err error) error {
-		if info.IsDir() && p != path {
+		switch {
+		case info.IsDir() && p != path:
 			return filepath.SkipDir
-		} else {
+		case Filter != "":
+			absolutePath, err := filepath.Abs(p)
+			if err != nil {
+				return err
+			}
+
+			if containsCaseIntensitive(p, Filter) {
+				paths = append(paths, absolutePath)
+			}
+		default:
 			absolutePath, err := filepath.Abs(p)
 			if err != nil {
 				return err
@@ -130,13 +148,25 @@ func getFilesRecursive(path string) ([]string, error) {
 	var paths []string
 
 	err := filepath.WalkDir(path, func(p string, info os.DirEntry, err error) error {
-		if !info.IsDir() {
+		switch {
+		case Filter != "" && !info.IsDir():
 			absolutePath, err := filepath.Abs(p)
 			if err != nil {
 				return err
 			}
+
+			if containsCaseIntensitive(p, Filter) {
+				paths = append(paths, absolutePath)
+			}
+		case Filter == "" && !info.IsDir():
+			absolutePath, err := filepath.Abs(p)
+			if err != nil {
+				return err
+			}
+
 			paths = append(paths, absolutePath)
 		}
+
 		return err
 	})
 	if err != nil {

cmd/root.go

@@ -10,6 +10,7 @@ import (
 	"github.com/spf13/cobra"
 )
 
+var Filter string
 var Port int
 var Recursive bool
 var Successive bool
@@ -32,6 +33,7 @@ func Execute() {
 }
 
 func init() {
+	rootCmd.Flags().StringVarP(&Filter, "filter", "f", "", "only display images matching specified pattern (case-insensitive)")
 	rootCmd.Flags().IntVarP(&Port, "port", "p", 8080, "port to listen on")
 	rootCmd.Flags().BoolVarP(&Recursive, "recursive", "r", false, "recurse into subdirectories")
 	rootCmd.Flags().BoolVarP(&Successive, "successive", "s", false, "load the next sequential file, if possible")

cmd/version.go

@@ -10,7 +10,7 @@ import (
 	"github.com/spf13/cobra"
 )
 
-var Version = "0.8.3"
+var Version = "0.9.0"
 
 func init() {
 	rootCmd.AddCommand(versionCmd)