Enhance CLI functionality with palette support and update exporters to use BlockPalette

crates/bin/Cargo.toml

@@ -17,6 +17,8 @@ lib = { path = "../lib" }
 exporters = { path = "../exporters" }
 clap = { version = "4.6.0", features = ["derive"] }
 anyhow = { workspace = true }
+serde = { workspace = true }
+serde_json = "1"
 thiserror = { workspace = true }
 tracing = { workspace = true }
 tracing-subscriber = { workspace = true, features = ["env-filter"] }

crates/bin/src/cli.rs

@@ -2,26 +2,34 @@ use std::{fs, path::PathBuf};
 
 use clap::Parser;
 use exporters::McFunctionExporter;
-use lib::{StructureExporter, TextBuilder, TtfFont};
+use lib::{BlockPalette, StructureExporter, TextBuilder, TtfFont};
 
 #[derive(Parser, Debug)]
 #[command(author, version, about, long_about = None)]
 struct Cli {
     /// The text you want to generate
-    #[arg(short, long)]
-    text: String,
+    #[arg(short, long, required_unless_present = "list_palettes")]
+    text: Option<String>,
 
     /// Path to the .ttf font file
-    #[arg(short, long)]
-    font: PathBuf,
+    #[arg(short, long, required_unless_present = "list_palettes")]
+    font: Option<PathBuf>,
 
     /// How many blocks deep the text should be
     #[arg(short, long, default_value_t = 1)]
     depth: u32,
 
-    /// The Minecraft block ID to use for the text body
-    #[arg(short, long, default_value = "minecraft:quartz_block")]
-    block: String,
+    /// Name of a built-in palette preset (from the palettes/ directory)
+    #[arg(short, long, conflicts_with = "palette_file")]
+    palette: Option<String>,
+
+    /// Path to a JSON palette file
+    #[arg(long)]
+    palette_file: Option<PathBuf>,
+
+    /// List available palette presets and exit
+    #[arg(long)]
+    list_palettes: bool,
 
     /// Output file path (without extension)
     #[arg(short, long, default_value = "output")]
@@ -32,26 +40,70 @@ struct Cli {
     size: f32,
 }
 
+fn palettes_dir() -> PathBuf {
+    std::env::current_exe()
+        .unwrap()
+        .parent()
+        .unwrap()
+        .join("palettes")
+}
+
+fn load_palette_by_name(name: &str) -> anyhow::Result<BlockPalette> {
+    let path = palettes_dir().join(format!("{}.json", name));
+    let json = fs::read_to_string(&path)
+        .map_err(|_| anyhow::anyhow!("palette '{}' not found in {:?}", name, palettes_dir()))?;
+    Ok(serde_json::from_str(&json)?)
+}
+
 pub fn run() -> anyhow::Result<()> {
     let cli = Cli::parse();
 
-    tracing::info!("loading font from: {:?}", cli.font);
-    let font_bytes = fs::read(&cli.font)?;
+    if cli.list_palettes {
+        let dir = palettes_dir();
+        let entries = fs::read_dir(&dir)
+            .map_err(|_| anyhow::anyhow!("palettes directory not found at {:?}", dir))?;
+        println!("Available palettes:");
+        for entry in entries.flatten() {
+            let path = entry.path();
+            if path.extension().and_then(|e| e.to_str()) == Some("json") {
+                if let Some(stem) = path.file_stem().and_then(|s| s.to_str()) {
+                    println!("  {}", stem);
+                }
+            }
+        }
+        return Ok(());
+    }
 
-    let font = TtfFont::from_bytes(&font_bytes, cli.size)
-        .map_err(|e| anyhow::anyhow!(e))?;
+    let text = cli.text.unwrap();
+    let font_path = cli.font.unwrap();
 
-    tracing::info!("generating voxel grid for text: '{}'", cli.text);
+    let palette = if let Some(path) = cli.palette_file {
+        let json = fs::read_to_string(&path)
+            .map_err(|e| anyhow::anyhow!("failed to read palette file {:?}: {}", path, e))?;
+        serde_json::from_str(&json)?
+    } else {
+        let name = cli.palette.as_deref().unwrap_or("default");
+        load_palette_by_name(name)?
+    };
+
+    tracing::info!("using palette: {}", palette.name);
+    tracing::info!("loading font from: {:?}", font_path);
+    let font_bytes = fs::read(&font_path)?;
+
+    let font = TtfFont::from_bytes(&font_bytes, cli.size).map_err(|e| anyhow::anyhow!(e))?;
+
+    tracing::info!("generating voxel grid for text: '{}'", text);
     let builder = TextBuilder::new(&font).with_depth(cli.depth);
-    let grid = builder.generate(&cli.text);
+    let grid = builder.generate(&text);
 
     tracing::info!(
         "grid generated: {}x{}x{}",
-        grid.width, grid.height, grid.depth
+        grid.width,
+        grid.height,
+        grid.depth
     );
 
-    let exporter = McFunctionExporter::new(&cli.block, "minecraft:obsidian");
-
+    let exporter = McFunctionExporter::new(&palette);
     let output_bytes = exporter.export(&grid)?;
 
     let mut out_path = cli.out.clone();