feat(cli): add --format flag for universal exporter selection

crates/bin/src/cli.rs

@@ -1,8 +1,8 @@
 use std::{fs, path::PathBuf};
 
 use clap::Parser;
-use exporters::McFunctionExporter;
-use lib::{BlockPalette, OutlineMode, StructureExporter, TextBuilder, TtfFont};
+use exporters;
+use lib::{BlockPalette, OutlineMode, TextBuilder, TtfFont};
 
 #[derive(Parser, Debug)]
 #[command(author, version, about, long_about = None)]
@@ -35,6 +35,10 @@ struct Cli {
     #[arg(short, long, default_value = "output")]
     out: PathBuf,
 
+    /// Output format(s): mcfunction, litematica, or all (repeatable)
+    #[arg(long, value_name = "FORMAT")]
+    format: Vec<String>,
+
     /// Height of the text in blocks
     #[arg(long, default_value_t = 16.0)]
     size: f32,
@@ -140,14 +144,24 @@ pub fn run() -> anyhow::Result<()> {
         grid.depth
     );
 
-    let exporter = McFunctionExporter::new(&palette);
-    let output_bytes = exporter.export(&grid)?;
+    let format_names: Vec<&str> = if cli.format.is_empty() {
+        vec!["mcfunction"]
+    } else if cli.format.iter().any(|f| f == "all") {
+        exporters::available_names()
+    } else {
+        cli.format.iter().map(String::as_str).collect()
+    };
 
-    let mut out_path = cli.out.clone();
-    out_path.set_extension(exporter.file_extension());
+    for name in format_names {
+        let exporter = exporters::build(name, &palette)
+            .ok_or_else(|| anyhow::anyhow!("unknown format '{}'. Available: {}", name, exporters::available_names().join(", ")))?;
 
-    fs::write(&out_path, output_bytes)?;
-    tracing::info!("saved to: {:?}", out_path);
+        let output_bytes = exporter.export(&grid)?;
+        let mut out_path = cli.out.clone();
+        out_path.set_extension(exporter.file_extension());
+        fs::write(&out_path, &output_bytes)?;
+        tracing::info!("saved {} to: {:?}", name, out_path);
+    }
 
     Ok(())
 }