fix: set binary name for completions

Author: ShaunSHamilton

src/plumbing/main.rs

@@ -1221,13 +1221,17 @@ pub fn main() -> Result<()> {
         },
         Subcommands::Completions { shell, out_dir } => {
             let mut app = Args::command();
+
+            let bin_name = "gix";
+            app.set_bin_name(bin_name);
+
             let shell = shell
                 .or_else(clap_complete::Shell::from_env)
                 .ok_or_else(|| anyhow!("The shell could not be derived from the environment"))?;
             if let Some(out_dir) = out_dir {
-                clap_complete::generate_to(shell, &mut app, env!("CARGO_PKG_NAME"), &out_dir)?;
+                clap_complete::generate_to(shell, &mut app, bin_name, &out_dir)?;
             } else {
-                clap_complete::generate(shell, &mut app, env!("CARGO_PKG_NAME"), &mut std::io::stdout());
+                clap_complete::generate(shell, &mut app, bin_name, &mut std::io::stdout());
             }
             Ok(())
         }