3 files changed, 123 insertions, 0 deletions
diff --git a/crates/cli/src/bin.rs b/crates/cli/src/bin.rs
new file mode 100644
index 0000000..3615e4a
--- /dev/null
+++ b/crates/cli/src/bin.rs
@@ -0,0 +1,112 @@
+use std::str::FromStr;
+
+use argh::FromArgs;
+use color_eyre::eyre::Result;
+use log::info;
+use tinywasm::{self, Module};
+mod util;
+
+#[cfg(feature = "wat")]
+mod wat;
+
+#[derive(FromArgs)]
+/// TinyWasm CLI
+struct TinyWasmCli {
+    #[argh(subcommand)]
+    nested: TinyWasmSubcommand,
+
+    /// log level
+    #[argh(option, short = 'l', default = "\"info\".to_string()")]
+    log_level: String,
+}
+
+#[derive(FromArgs)]
+#[argh(subcommand)]
+enum TinyWasmSubcommand {
+    Run(Run),
+}
+
+enum Engine {
+    Main,
+}
+
+impl FromStr for Engine {
+    type Err = String;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        match s {
+            "main" => Ok(Self::Main),
+            _ => Err(format!("unknown engine: {}", s)),
+        }
+    }
+}
+
+#[derive(FromArgs)]
+/// run a wasm file
+#[argh(subcommand, name = "run")]
+struct Run {
+    /// wasm file to run
+    #[argh(positional)]
+    wasm_file: String,
+
+    /// engine to use
+    #[argh(option, short = 'e', default = "Engine::Main")]
+    engine: Engine,
+}
+
+fn main() -> Result<()> {
+    color_eyre::install()?;
+
+    let args: TinyWasmCli = argh::from_env();
+    let level = match args.log_level.as_str() {
+        "trace" => log::LevelFilter::Trace,
+        "debug" => log::LevelFilter::Debug,
+        "warn" => log::LevelFilter::Warn,
+        "error" => log::LevelFilter::Error,
+        "info" => log::LevelFilter::Info,
+        _ => log::LevelFilter::Info,
+    };
+
+    pretty_env_logger::formatted_builder()
+        .filter_level(level)
+        .init();
+
+    let cwd = std::env::current_dir()?;
+
+    match args.nested {
+        TinyWasmSubcommand::Run(Run { wasm_file, engine }) => {
+            let path = cwd.join(wasm_file.clone());
+            let module = match wasm_file.ends_with(".wat") {
+                #[cfg(feature = "wat")]
+                true => {
+                    let wat = std::fs::read_to_string(path)?;
+                    let wasm = wat::wat2wasm(&wat);
+                    tinywasm::Module::parse_bytes(&wasm)?
+                }
+                #[cfg(not(feature = "wat"))]
+                true => {
+                    return Err(color_eyre::eyre::eyre!(
+                        "wat support is not enabled in this build"
+                    ))
+                }
+                false => tinywasm::Module::parse_file(path)?,
+            };
+
+            match engine {
+                Engine::Main => run(module),
+            }
+        }
+    }
+}
+
+fn run(module: Module) -> Result<()> {
+    let mut store = tinywasm::Store::default();
+
+    let instance = module.instantiate(&mut store)?;
+
+    let func = instance.get_typed_func::<(i32, i32), (i32,)>(&store, "add")?;
+    let (res,) = func.call(&mut store, (2, 2))?;
+    info!("{res:?}");
+
+    Ok(())
+}
diff --git a/crates/cli/src/util.rs b/crates/cli/src/util.rs
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/crates/cli/src/util.rs
@@ -0,0 +1 @@
+
diff --git a/crates/cli/src/wat.rs b/crates/cli/src/wat.rs
new file mode 100644
index 0000000..fd00a8e
--- /dev/null
+++ b/crates/cli/src/wat.rs
@@ -0,0 +1,10 @@
+use wast::{
+    parser::{self, ParseBuffer},
+    Wat,
+};
+
+pub fn wat2wasm(wat: &str) -> Vec<u8> {
+    let buf = ParseBuffer::new(wat).expect("failed to create parse buffer");
+    let mut module = parser::parse::<Wat>(&buf).expect("failed to parse wat");
+    module.encode().expect("failed to encode wat")
+}