nix: use upstream 'clang-format' hook

The behaviour makes more sense when e.g: one modifies the clang-format
rules but has not committed them yet.

.clang-format

@@ -7,4 +7,8 @@ Language: Cpp
 # Force pointers to the type for C++.
 DerivePointerAlignment: false
 PointerAlignment: Left
+
+# Break after every argument or not at all
+BinPackArguments: false
+BinPackParameters: false
 ---

flake.lock

@@ -42,11 +42,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1631170176,
-        "narHash": "sha256-RLN/kur2Kpxt0cJp0Fms8ixuGpT8IHX0OpeQ8u8f0X4=",
+        "lastModified": 1633726775,
+        "narHash": "sha256-imcgx7bHP0qzRNu31jknZAzze71pWnEbMbnBcZYxXMg=",
         "owner": "cachix",
         "repo": "pre-commit-hooks.nix",
-        "rev": "3ed0e618cebc1ff291c27b749cf7568959cac028",
+        "rev": "77b45d526e4dcc1f26ce449f5dc561f2e6eb5db6",
         "type": "github"
       },
       "original": {

flake.nix

@@ -49,15 +49,12 @@
 
         checks = {
           pre-commit = pre-commit-hooks.lib.${system}.run {
-            src = self;
+            src = ./.;
 
             hooks = {
               clang-format = {
                 enable = true;
-                name = "clang-format";
-                entry = "${pkgs.clang-tools}/bin/clang-format -style=file -i";
-                types = [ "text" "c++" ];
-                language = "system";
+                types_or = [ "c++" ];
               };
 
               nixpkgs-fmt = {
@@ -72,10 +69,9 @@
         defaultPackage = packages.dragger;
 
         devShell = pkgs.mkShell {
-          nativeBuildInputs = with pkgs; [ ]
-          ++ defaultPackage.nativeBuildInputs
-          ++ defaultPackage.buildInputs
-          ;
+          inputsFrom = with packages; [
+            dragger
+          ];
 
           inherit (checks.pre-commit) shellHook;
         };

src/dragger.cc

@@ -1,4 +1,5 @@
 #include <QApplication>
+#include <QCommandLineParser>
 #include <QDebug>
 #include <QDrag>
 #include <QFile>
@@ -9,10 +10,23 @@
 
 int main(int argc, char* argv[]) {
     QApplication app(argc, argv);
+    QApplication::setApplicationName("dragger");
+    QApplication::setApplicationVersion("0.1.0");
+
+    QCommandLineParser parser;
+    parser.setApplicationDescription("A CLI drag-and-drop tool");
+    parser.addHelpOption();
+    parser.addVersionOption();
+    parser.addPositionalArgument(
+        "files",
+        QCoreApplication::translate("files", "files to drag-and-drop"),
+        "[FILES...]");
+
+    parser.process(app);
 
     QList<QUrl> urls;
-    for (int i = 1; i < argc; ++i) {
-        QFileInfo file(QFile(argv[i]));
+    for (auto const& path : parser.positionalArguments()) {
+        QFileInfo file{QFile{path}};
         if (file.exists()) {
             urls << QUrl("file:" + file.absoluteFilePath());
         } else {