Reduce binary size and add directory check for file input

- Updated `clap` configuration in Cargo.toml to disable default features, reducing binary size.
- Modified main.rs to check if the provided path is a file, preventing directory input errors.
- Bumped version from 1.0.2 to 1.0.3.

Cargo.toml

@@ -1,14 +1,14 @@
 [package]
 name = "windows-cat"
-version = "1.0.2"
+version = "1.0.3"
 edition = "2021"
 description = "unix cat command for windows"
 readme = "README.md"
 repository = "https://github.com/tralwdwd/windows-cat"
 license = "MIT"
 
 [dependencies]
-clap = "4.5.20"
+clap = {version="4.5.20", default-features=false, features=["std"]}
 
 [[bin]]
 name = "cat"

src/main.rs

@@ -1,4 +1,5 @@
 use std::fs;
+use std::path::PathBuf;
 use clap::{Arg, Command};
 
 fn main(){
@@ -12,11 +13,12 @@ fn main(){
         .index(1)
     )
     .get_matches();
-    let file = matches.get_one::<String>("file")
+    let file = PathBuf::from(matches.get_one::<String>("file")
     .unwrap_or_else(|| {
     eprint!("Error: No file specified");
     std::process::exit(1); 
-    });
+    }));
+    if !file.is_dir(){
     match fs::read_to_string(file) {
         Ok(contents) => {
             // Successfully read the file
@@ -28,4 +30,8 @@ fn main(){
             std::process::exit(1);
         }
     }
+}else{
+    eprint!("Error: Path is not a file");
+    std::process::exit(1);
+}
 }