duplicate config check, change default config if Windows

src/config.rs

@@ -118,15 +118,30 @@ pub fn read_config(paths: Vec<PathBuf>, refractr: &common::Refractr) -> Vec<Conf
     }
 
     let config_file = ConfigFile {
-      path: String::from(path.to_string_lossy()),
+      path: match fs::canonicalize(&path) {
+        Err(_) => panic!("refractr: cannot get absolute path of config file: {}", path.as_path().display()),
+        Ok(abs) => abs.to_string_lossy().to_string()
+      },
       file: match fs::metadata(&path) {
-        Err(_) => panic!("refractr: cannot obtain metadata: {}", path.as_path().display()),
+        Err(_) => panic!("refractr: cannot obtain metadata for config file: {}", path.as_path().display()),
         Ok(metadata) => metadata
       },
       config: verify_config(toml::from_str(&data).unwrap())
     };
 
-    config_files.push(config_file);
+    let mut dup = false;
+    for i in &config_files {
+      if i.path == config_file.path {
+        eprintln!("refractr: warning: skipping config file \"{}\" as it was already read", path.as_path().display());
+        dup = true;
+        break;
+      }
+    }
+    
+    if !dup {
+      config_files.push(config_file);
+    }
+
   }
 
   return config_files;

src/main.rs

@@ -11,7 +11,7 @@ use std::process;
 #[command(about = "An automated push/pull/clone utility for mirroring Git repositories")]
 #[command(long_about = None)]
 struct Args {
-  #[arg(short, long, help = "Specify a config file", default_value = "/etc/refractr/config.toml")]
+  #[arg(short, long, help = "Specify a config file", default_value = get_config_default())]
   config: Vec<PathBuf>,
 
   #[arg(short, long, help = "Specify the level of verbosity", action = clap::ArgAction::Count)]
@@ -21,6 +21,14 @@ struct Args {
   create: bool,
 }
 
+fn get_config_default() -> &'static str {
+  if cfg!(windows) {
+    "C:\\ProgramData\\refractr\\config.toml"
+  } else {
+    "/etc/refractr/config.toml"
+  }
+}
+
 fn main() {
   let args = Args::parse();
   let refractr = common::Refractr {