refactor: Code-Qualität und Usability verbessern

- Ungenutzte Dependencies entfernt (itertools, thiserror)
- 560 Build-Artefakte (target/) aus Git-Tracking entfernt
- NO_COLOR Umgebungsvariable unterstützen (https://no-color.org/)
- if let Ok/Err durch idiomatisches match ersetzt
- Fehlermeldung bei Aufruf ohne Pfade hinzugefügt
- Sequence::default() zu Sequence::standard() umbenannt
  um Verwechslung mit dem Rust Default-Trait zu vermeiden

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Cargo.toml

@@ -26,15 +26,13 @@ emojis = "0.6.1"
 regex = "1.10.3"
 dirs = "5.0.1"
 
-# Neue empfohlene Abhängigkeiten
+# Weitere Abhängigkeiten
 anyhow = "1.0.80"           # Verbesserte Fehlerbehandlung
-thiserror = "1.0.57"        # Typisierte Fehler
 once_cell = "1.19.0"        # Lazy-Initialisierung für statische Werte
 rayon = "1.9.0"             # Parallelverarbeitung
 indicatif = "0.17.7"        # Fortschrittsbalken
 env_logger = "0.11.2"       # Logging-Framework
 log = "0.4.21"              # Logging-Abstraktionen
-itertools = "0.12.1"        # Erweiterte Iterator-Funktionalität
 colored = "2.1"             # Farbige Terminal-Ausgabe
 
 [dev-dependencies]

src/main.rs

@@ -42,9 +42,11 @@ struct RenameOperation {
     new_path: PathBuf,
 }
 
-/// Prüft ob farbige Ausgabe aktiviert sein soll
+/// Prüft ob farbige Ausgabe aktiviert sein soll.
+/// Respektiert --no-color Flag, NO_COLOR Umgebungsvariable (https://no-color.org/)
+/// und ob stdout ein Terminal ist.
 fn should_use_color(no_color_flag: bool) -> bool {
-    !no_color_flag && std::io::stdout().is_terminal()
+    !no_color_flag && std::env::var_os("NO_COLOR").is_none() && std::io::stdout().is_terminal()
 }
 
 /// Startpunkt des Programms
@@ -75,7 +77,7 @@ fn main() -> Result<()> {
             )
         })?
     } else {
-        Sequence::default()
+        Sequence::standard()
     };
 
     if args.verbose {
@@ -116,6 +118,12 @@ fn main() -> Result<()> {
         }
     }
 
+    // Prüfe ob Pfade angegeben wurden
+    if args.paths.is_empty() {
+        eprintln!("Keine Pfade angegeben. Nutze 'ntu --help' für Hilfe.");
+        std::process::exit(1);
+    }
+
     // Für alle angegebenen Pfade
     for path in &args.paths {
         // Alle Einträge sammeln, damit zuerst die tiefsten umbenannt werden
@@ -140,13 +148,12 @@ fn main() -> Result<()> {
             .into_iter()
             .filter_entry(|e| !is_excluded(e, &exclude_patterns))
         {
-            if let Ok(entry) = entry_result {
+            match entry_result {
-                entries.push(entry);
+                Ok(entry) => entries.push(entry),
-            } else if let Err(e) = entry_result {
+                Err(e) => error!(
-                error!(
                     "{}",
                     format!("Fehler beim Durchlaufen von {}: {}", path.display(), e).red()
-                );
+                ),
             }
         }
 

src/sanitizer.rs

@@ -83,8 +83,8 @@ impl Sequence {
         Self::all().into_iter().find(|s| s.name == name)
     }
 
-    /// Gibt die Default-Sequence zurück
+    /// Gibt die Standard-Sequence zurück
-    pub fn default() -> Sequence {
+    pub fn standard() -> Sequence {
         Self::find("default").unwrap()
     }
 }
@@ -406,7 +406,7 @@ mod tests {
     #[test]
     fn test_clean_filename_basic() {
         let config = Config::default();
-        let sequence = Sequence::default();
+        let sequence = Sequence::standard();
 
         // Spaces should become underscores
         assert_eq!(
@@ -430,7 +430,7 @@ mod tests {
     #[test]
     fn test_clean_filename_hidden_files() {
         let config = Config::default();
-        let sequence = Sequence::default();
+        let sequence = Sequence::standard();
 
         // Hidden files should keep their leading dot
         assert_eq!(
@@ -460,7 +460,7 @@ mod tests {
     #[test]
     fn test_clean_filename_umlauts() {
         let config = make_test_config();
-        let sequence = Sequence::default();
+        let sequence = Sequence::standard();
 
         // German umlauts
         assert_eq!(
@@ -482,7 +482,7 @@ mod tests {
     #[test]
     fn test_clean_filename_extensions() {
         let config = Config::default();
-        let sequence = Sequence::default();
+        let sequence = Sequence::standard();
 
         // Single extension
         assert_eq!(
@@ -543,7 +543,7 @@ mod tests {
     #[test]
     fn test_clean_filename_special_identifiers() {
         let config = Config::default();
-        let sequence = Sequence::default();
+        let sequence = Sequence::standard();
 
         // C++ should be preserved
         assert_eq!(
@@ -561,7 +561,7 @@ mod tests {
     #[test]
     fn test_clean_filename_no_change_needed() {
         let config = Config::default();
-        let sequence = Sequence::default();
+        let sequence = Sequence::standard();
 
         // Already clean filenames should return None
         assert_eq!(
@@ -578,7 +578,7 @@ mod tests {
     #[test]
     fn test_clean_filename_empty_after_cleaning() {
         let config = Config::default();
-        let sequence = Sequence::default();
+        let sequence = Sequence::standard();
 
         // File with only special chars should become "unnamed"
         assert_eq!(
@@ -590,7 +590,7 @@ mod tests {
     #[test]
     fn test_clean_filename_apostrophe() {
         let config = Config::default();
-        let sequence = Sequence::default();
+        let sequence = Sequence::standard();
 
         // Apostrophes should be removed (not replaced with underscore)
         assert_eq!(

target/.rustc_info.json

@@ -1 +0,0 @@
-{"rustc_fingerprint":4740973386762217857,"outputs":{"7971740275564407648":{"success":true,"status":"","code":0,"stdout":"___\nlib___.rlib\nlib___.so\nlib___.so\nlib___.a\nlib___.so\n/home/dschlueter/.rustup/toolchains/stable-x86_64-unknown-linux-gnu\noff\npacked\nunpacked\n___\ndebug_assertions\npanic=\"unwind\"\nproc_macro\ntarget_abi=\"\"\ntarget_arch=\"x86_64\"\ntarget_endian=\"little\"\ntarget_env=\"gnu\"\ntarget_family=\"unix\"\ntarget_feature=\"fxsr\"\ntarget_feature=\"sse\"\ntarget_feature=\"sse2\"\ntarget_has_atomic=\"16\"\ntarget_has_atomic=\"32\"\ntarget_has_atomic=\"64\"\ntarget_has_atomic=\"8\"\ntarget_has_atomic=\"ptr\"\ntarget_os=\"linux\"\ntarget_pointer_width=\"64\"\ntarget_vendor=\"unknown\"\nunix\n","stderr":""},"17747080675513052775":{"success":true,"status":"","code":0,"stdout":"rustc 1.90.0 (1159e78c4 2025-09-14)\nbinary: rustc\ncommit-hash: 1159e78c4747b02ef996e55082b704c09b970588\ncommit-date: 2025-09-14\nhost: x86_64-unknown-linux-gnu\nrelease: 1.90.0\nLLVM version: 20.1.8\n","stderr":""},"11857020428658561806":{"success":true,"status":"","code":0,"stdout":"___\nlib___.rlib\nlib___.so\nlib___.so\nlib___.a\nlib___.so\n/home/dschlueter/.rustup/toolchains/stable-x86_64-unknown-linux-gnu\noff\npacked\nunpacked\n___\ndebug_assertions\npanic=\"unwind\"\nproc_macro\ntarget_abi=\"\"\ntarget_arch=\"x86_64\"\ntarget_endian=\"little\"\ntarget_env=\"gnu\"\ntarget_family=\"unix\"\ntarget_feature=\"fxsr\"\ntarget_feature=\"sse\"\ntarget_feature=\"sse2\"\ntarget_has_atomic=\"16\"\ntarget_has_atomic=\"32\"\ntarget_has_atomic=\"64\"\ntarget_has_atomic=\"8\"\ntarget_has_atomic=\"ptr\"\ntarget_os=\"linux\"\ntarget_pointer_width=\"64\"\ntarget_vendor=\"unknown\"\nunix\n","stderr":""}},"successes":{}}

target/CACHEDIR.TAG

@@ -1,3 +0,0 @@
-Signature: 8a477f597d28d172789f06886806bc55
-# This file is a cache directory tag created by cargo.
-# For information about cache directory tags see https://bford.info/cachedir/

target/release/.fingerprint/NameToUnix-52eb14cd7f851fcf/bin-NameToUnix

@@ -1 +0,0 @@
-291cfff3ad3b4550

target/release/.fingerprint/NameToUnix-52eb14cd7f851fcf/bin-NameToUnix.json

@@ -1 +0,0 @@
-{"rustc":2484451964687019519,"features":"[]","declared_features":"[]","target":6121981589821494128,"profile":3878794443245516162,"path":10602529704205407992,"deps":[[496936660758387454,"walkdir",false,16653160629585727827],[781203651122893512,"itertools",false,4856790396137166786],[2253645963862362999,"glob",false,17901889553727651475],[2751633865096478575,"once_cell",false,404175244902379717],[4861353637455856501,"emojis",false,7812852181959777352],[5957121993870933949,"indicatif",false,6846573194333882574],[6903225003750382070,"env_logger",false,12129958749168747241],[8121005825001993377,"toml",false,14529174445398999363],[8444115378192700076,"anyhow",false,15790217775176775280],[9300925758419628329,"log",false,7601692817919657737],[9722518470958012960,"clap",false,6017947166156778644],[11266840602298992523,"thiserror",false,2303909277957177506],[11641382387439738731,"regex",false,1153832817102413080],[11892580040701647366,"serde",false,16170242140613763432],[16233166307772572446,"unicode_segmentation",false,13473434130131659026],[17775862536196513609,"rayon",false,4741632797656246936],[17902303992486982172,"dirs",false,15255450532072959597]],"local":[{"CheckDepInfo":{"dep_info":"release/.fingerprint/NameToUnix-52eb14cd7f851fcf/dep-bin-NameToUnix"}}],"rustflags":[],"metadata":11238891150943416482,"config":2202906307356721367,"compile_kind":0}

target/release/.fingerprint/NameToUnix-52eb14cd7f851fcf/invoked.timestamp

@@ -1 +0,0 @@
-This file has an mtime of when this was started.

target/release/.fingerprint/aho-corasick-17f8b4266e41b6ce/invoked.timestamp

@@ -1 +0,0 @@
-This file has an mtime of when this was started.

target/release/.fingerprint/aho-corasick-17f8b4266e41b6ce/lib-aho_corasick

@@ -1 +0,0 @@
-4dd8cd57cf0e9b09

target/release/.fingerprint/aho-corasick-17f8b4266e41b6ce/lib-aho_corasick.json

@@ -1 +0,0 @@
-{"rustc":2484451964687019519,"features":"[\"perf-literal\", \"std\"]","declared_features":"[\"default\", \"logging\", \"perf-literal\", \"std\"]","target":9771195463141993919,"profile":11260102936901317155,"path":16307491102300075524,"deps":[[554324495028472449,"memchr",false,217317700187571089]],"local":[{"CheckDepInfo":{"dep_info":"release/.fingerprint/aho-corasick-17f8b4266e41b6ce/dep-lib-aho_corasick"}}],"rustflags":[],"metadata":13904389431191498124,"config":2202906307356721367,"compile_kind":0}

target/release/.fingerprint/anstream-c3c9a361c5ec1896/invoked.timestamp

@@ -1 +0,0 @@
-This file has an mtime of when this was started.

target/release/.fingerprint/anstream-c3c9a361c5ec1896/lib-anstream

@@ -1 +0,0 @@
-16e4bdea9a608b73

target/release/.fingerprint/anstream-c3c9a361c5ec1896/lib-anstream.json

@@ -1 +0,0 @@
-{"rustc":2484451964687019519,"features":"[\"auto\", \"default\", \"wincon\"]","declared_features":"[\"auto\", \"default\", \"test\", \"wincon\"]","target":1736373845211751465,"profile":5847708262638652504,"path":15382520749374289969,"deps":[[821897733253474908,"anstyle",false,18094389414750515593],[6726333832837302156,"anstyle_query",false,6517661958451464783],[8720183142424604966,"utf8parse",false,18444629462088036825],[9119385831240683871,"is_terminal_polyfill",false,15365458187358078183],[16168342247272166835,"anstyle_parse",false,11337828736863921905],[17599588001959536047,"colorchoice",false,1614739890724786504]],"local":[{"CheckDepInfo":{"dep_info":"release/.fingerprint/anstream-c3c9a361c5ec1896/dep-lib-anstream"}}],"rustflags":[],"metadata":7500874485387469444,"config":2202906307356721367,"compile_kind":0}

target/release/.fingerprint/anstyle-86948fab8bcbae58/invoked.timestamp

@@ -1 +0,0 @@
-This file has an mtime of when this was started.