feat: --rename-validated flag on validate

With this flag, a validated file will be renamed to match the name in the datfile (if necessary).

README.md

@@ -205,7 +205,19 @@ If you want to use your own, specify it with the `--datfile` flag.
 ```
 $ rom64 validate ~/Downloads/n64/Tsumi\ to\ Batsu\ -\ Hoshi\ no\ Keishousha\ \(Japan\).z64
 Found 1 datfile entries for ROM serial 'NGUJ'
-  SHA-1 MATCH  581297B9D5C3A4C33169AE0AAE218C742CD9CBCF Tsumi to Batsu - Hoshi no Keishousha (Japan).z64
+SHA-1 MATCH  581297B9D5C3A4C33169AE0AAE218C742CD9CBCF "Tsumi to Batsu - Hoshi no Keishousha (Japan).z64"
+```
+
+#### `--rename-validated`
+
+With this flag, after a ROM's hash has been validated against the datfile, the ROM file will
+be renamed to match what's in the datfile, if it doesn't already.
+
+```
+$ rom64 validate --rename-validated sm64.z64
+Found 1 datfile entries for ROM serial 'NSME'
+SHA-1 MATCH  9BEF1128717F958171A4AFAC3ED78EE2BB4E86CE "Super Mario 64 (USA).z64"
+Renaming "sm64.z64" => "Super Mario 64 (USA).z64"
 ```
 
 [dat-o-matic]: https://datomatic.no-intro.org/index.php?page=download&s=24&op=dat

cmd/validate.go

@@ -2,26 +2,29 @@ package cmd
 
 import (
 	"fmt"
+	"os"
+	"path"
 
 	"github.com/mroach/rom64/dat"
 	"github.com/mroach/rom64/rom"
 	"github.com/spf13/cobra"
 )
 
 var datFilePath string
+var renameValidated bool
 
 func init() {
 	var validateCmd = &cobra.Command{
 		Use:   "validate",
 		Short: "Validate the hash of a ROM against a known-good list",
 		Args:  cobra.MinimumNArgs(1),
 		RunE: func(cmd *cobra.Command, args []string) error {
-			path := args[0]
+			romFilePath := args[0]
 
 			var df dat.DatFile
 			var err error
 
-			romfile, err := rom.FromPath(path)
+			romfile, err := rom.FromPath(romFilePath)
 			if err != nil {
 				return err
 			}
@@ -44,26 +47,58 @@ func init() {
 				return err
 			}
 
-			fmt.Printf("Found %d datfile entries for ROM serial '%s'\n", len(matches), romfile.Serial())
+			var matchCount = len(matches)
 
-			if len(matches) > 0 {
-				for _, match := range matches {
-					fmt.Printf("  %-5s \033[32m%-6s\033[0m %40s %s\n", "SHA-1", "MATCH", match.SHA1, match.Name)
+			if matchCount == 0 {
+				fmt.Println("Could not find a checksum match.")
+				fmt.Printf("File '%s' has SHA-1 %s", romfile.File.Name, romfile.File.SHA1)
+				fmt.Println("The datfile has the following entries for this ROM:")
+				for _, mismatch := range mismatches {
+					fmt.Printf("  %-5s %50s %s", "SHA-1\n", mismatch.SHA1, mismatch.Name)
 				}
-				return nil
+				return fmt.Errorf("%s validation failed", romFilePath)
 			}
 
-			fmt.Println("Could not find a checksum match.")
-			fmt.Printf("File '%s' has SHA-1 %s", romfile.File.Name, romfile.File.SHA1)
-			fmt.Println("The datfile has the following entries for this ROM:")
-			for _, mismatch := range mismatches {
-				fmt.Printf("  %-5s %50s %s", "SHA-1", mismatch.SHA1, mismatch.Name)
+			fmt.Printf("Found %d datfile entries for ROM serial '%s'\n", matchCount, romfile.Serial())
+
+			for _, match := range matches {
+				fmt.Printf("%-5s \033[32m%-6s\033[0m %40s \"%s\"\n", "SHA-1", "MATCH", match.SHA1, match.Name)
+			}
+
+			if matchCount > 1 {
+				return fmt.Errorf("Multiple datfile entries found with the same SHA-1 hash. This shouldn't happen. Aborting.")
+			}
+
+			var match = matches[0]
+
+			if renameValidated {
+				var correctName = match.Name
+				if romfile.File.Name == correctName {
+					fmt.Printf("ROM file already has the correct name \"%s\"\n", correctName)
+					return nil
+				}
+
+				var sourcePath = romfile.File.Path
+				var newPath = path.Join(path.Dir(sourcePath), correctName)
+
+				fmt.Printf("Renaming \"%s\" => \"%s\"\n", romfile.File.Path, newPath)
+
+				if _, err := os.Stat(newPath); err == nil {
+					return fmt.Errorf("Destination file \"%s\" already exists. Aborting.", newPath)
+				}
+
+				err = os.Rename(sourcePath, newPath)
+				if err != nil {
+					return err
+				}
 			}
-			return fmt.Errorf("%s validation failed", path)
+
+			return nil
 		},
 	}
 
 	validateCmd.Flags().StringVarP(&datFilePath, "datfile", "d", "", "Load custom DAT file (XML format)")
+	validateCmd.Flags().BoolVarP(&renameValidated, "rename-validated", "", false, "Rename validated files to match the filename in the datefile.")
 
 	rootCmd.AddCommand(validateCmd)
 }