Add List function

src/app.rs

@@ -47,6 +47,8 @@ enum Subcommand {
         #[clap(subcommand)]
         command: UtilSubcommand,
     },
+    /// List available build modes
+    List,
 }
 
 #[derive(clap::Subcommand)]
@@ -143,10 +145,29 @@ impl App {
                     }
                 }
             },
+            Subcommand::List => match list() {
+                Err(e) => {
+                    eprintln!("Error listing build profiles: {e}");
+                    std::process::exit(1);
+                }
+                _ => {}
+            },
         }
     }
 }
 
+fn list() -> std::io::Result<()> {
+    let conf = get_config().ok_or(std::io::Error::new(
+        std::io::ErrorKind::NotFound,
+        "no Pallet.toml found in local directory",
+    ))?;
+    for build in conf.build {
+        println!(" - {}: {:?}", build.name.green().bold(), build.args);
+    }
+
+    Ok(())
+}
+
 fn create_project<P: AsRef<Path>>(directory: P) -> std::io::Result<()> {
     let name = if directory.as_ref().to_string_lossy() == "." {
         String::new()