diff --git a/.gitignore b/.gitignore
index cc0d227..af441a4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,12 @@
+# garbage
 /target
-/bytecode/src/instrs.rs
-/.rgignore
 rustc-ice-*
+
+# sqlite
 db.sqlite
+db.sqlite-journal
+
+# assets
 /depell/src/*.gz
+/depell/src/*.wasm
+/bytecode/src/instrs.rs
diff --git a/Cargo.lock b/Cargo.lock
index 14c0d16..d3faf19 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -137,6 +137,15 @@ version = "1.7.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "428d9aa8fbc0670b7b8d6030a7fadd0f86151cae55e4dbbece15f3780a3dfaf3"
 
+[[package]]
+name = "cc"
+version = "1.1.30"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b16803a61b81d9eabb7eae2588776c4c1e584b738ede45fdbb4c972cec1e9945"
+dependencies = [
+ "shlex",
+]
+
 [[package]]
 name = "cfg-if"
 version = "1.0.0"
@@ -417,6 +426,7 @@ version = "0.30.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2e99fb7a497b1e3339bc746195567ed8d3e24945ecd636e3619d20b9de9e9149"
 dependencies = [
+ "cc",
  "pkg-config",
  "vcpkg",
 ]
@@ -649,6 +659,12 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "shlex"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0fda2ff0d084019ba4d7c6f371c95d8fd75ce3524c3cb8fb653a3023f6323e64"
+
 [[package]]
 name = "smallvec"
 version = "1.13.2"
diff --git a/depell/Cargo.toml b/depell/Cargo.toml
index cc377b0..6fd1ad9 100644
--- a/depell/Cargo.toml
+++ b/depell/Cargo.toml
@@ -8,10 +8,7 @@ axum = "0.7.7"
 getrandom = "0.2.15"
 htmlm = "0.5.0"
 log = "0.4.22"
-rusqlite = "0.32.1"
+rusqlite = { version = "0.32.1", features = ["bundled"] }
 serde = { version = "1.0.210", features = ["derive"] }
 time = "0.3.36"
 tokio = { version = "1.40.0", features = ["rt"] }
-
-[features]
-gzip = []
diff --git a/depell/README.md b/depell/README.md
new file mode 100644
index 0000000..a5ccaa7
--- /dev/null
+++ b/depell/README.md
@@ -0,0 +1,10 @@
+# Depell
+
+Depell is a website that allows users to import/post/run hblang code and create huge dependency graphs
+
+## Local Development
+
+```bash
+cargo xtask watch-depell
+# browser http://localhost:8080
+```
diff --git a/depell/src/index.css b/depell/src/index.css
index a5c20bd..94a7521 100644
--- a/depell/src/index.css
+++ b/depell/src/index.css
@@ -70,6 +70,7 @@ textarea {
 	padding-top: calc(var(--small-gap) * 1.5);
 	font-family: var(--monospace);
 	resize: none;
+	tab-size: 4;
 }
 
 pre {
diff --git a/depell/src/index.js b/depell/src/index.js
index fd97683..431de93 100644
--- a/depell/src/index.js
+++ b/depell/src/index.js
@@ -5,28 +5,21 @@ function never() { throw new Error() }
 
 /**@type{WebAssembly.Instance}*/ let hbcInstance;
 /**@type{Promise<WebAssembly.WebAssemblyInstantiatedSource>}*/ let hbcInstaceFuture;
-/** @param {Uint8Array} code @param {number} fuel
- * @returns {Promise<string | undefined> | string | undefined} */
-function compileCode(code, fuel) {
-	if (!hbcInstance) {
-		hbcInstaceFuture ??= WebAssembly.instantiateStreaming(fetch("/hbc.wasm"), {});
-		return (async () => {
-			hbcInstance = (await hbcInstaceFuture).instance;
-			return compileCodeSync(hbcInstance, code, fuel);
-		})();
-	} else {
-		return compileCodeSync(hbcInstance, code, fuel);
-	}
-
+async function getHbcInstance() {
+	hbcInstaceFuture ??= WebAssembly.instantiateStreaming(fetch("/hbc.wasm"), {});
+	return hbcInstance ??= (await hbcInstaceFuture).instance;
 }
 
-/** @param {WebAssembly.Instance} instance @param {Uint8Array} code @param {number} fuel @returns {string | undefined} */
-function compileCodeSync(instance, code, fuel) {
+const stack_pointer_offset = 1 << 20;
+
+/** @param {WebAssembly.Instance} instance @param {Uint8Array} code @param {number} fuel
+ * @returns {string} */
+function compileCode(instance, code, fuel) {
 	let {
 		INPUT, INPUT_LEN,
 		LOG_MESSAGES, LOG_MESSAGES_LEN,
 		PANIC_MESSAGE, PANIC_MESSAGE_LEN,
-		memory, compile_and_run
+		memory, compile_and_run,
 	} = instance.exports;
 
 	if (!(true
@@ -48,48 +41,57 @@ function compileCodeSync(instance, code, fuel) {
 	} catch (e) {
 		if (PANIC_MESSAGE instanceof WebAssembly.Global
 			&& PANIC_MESSAGE_LEN instanceof WebAssembly.Global) {
-			console.error(bufToString(memory, PANIC_MESSAGE, PANIC_MESSAGE_LEN));
+			console.error(e, bufToString(memory, PANIC_MESSAGE, PANIC_MESSAGE_LEN));
 		}
-		let log = bufToString(memory, LOG_MESSAGES, LOG_MESSAGES_LEN);
-		console.error(log, e);
-		return undefined;
+		return bufToString(memory, LOG_MESSAGES, LOG_MESSAGES_LEN);
 	}
 }
 
+/** @typedef {Object} Post
+ * @property {string} path 
+ * @property {string} code */
+
+/** @param {Post[]} posts @returns {Uint8Array} */
+function packPosts(posts) {
+	let len = 0; for (const post of posts) len += 2 + post.path.length + 2 + post.code.length;
+
+	const buf = new Uint8Array(len), view = new DataView(buf.buffer), enc = new TextEncoder();
+	len = 0; for (const post of posts) {
+		view.setUint16(len, post.path.length, true); len += 2;
+		buf.set(enc.encode(post.path), len); len += post.path.length;
+		view.setUint16(len, post.code.length, true); len += 2;
+		buf.set(enc.encode(post.code), len); len += post.code.length;
+	}
+
+	return buf;
+}
+
 /** @param {WebAssembly.Memory} mem
  * @param {WebAssembly.Global} ptr
  * @param {WebAssembly.Global} len
  * @return {string} */
 function bufToString(mem, ptr, len) {
-	return new TextDecoder()
+	const res = new TextDecoder()
 		.decode(new Uint8Array(mem.buffer, ptr.value,
 			new DataView(mem.buffer).getUint32(len.value, true)));
+	new DataView(mem.buffer).setUint32(len.value, 0, true);
+	return res;
 }
 
 /**@type{WebAssembly.Instance}*/ let fmtInstance;
 /**@type{Promise<WebAssembly.WebAssemblyInstantiatedSource>}*/ let fmtInstaceFuture;
 /** @param {string} code @param {"fmt" | "minify"} action
- * @returns {Promise<string | undefined> | string | undefined} */
-function modifyCode(code, action) {
-	if (!fmtInstance) {
-		fmtInstaceFuture ??= WebAssembly.instantiateStreaming(fetch("/hbfmt.wasm"), {});
-		return (async () => {
-			fmtInstance = (await fmtInstaceFuture).instance;
-			return modifyCodeSync(fmtInstance, code, action);
-		})();
-	} else {
-		return modifyCodeSync(fmtInstance, code, action);
-	}
-}
+ * @returns {Promise<string | undefined>} */
+async function modifyCode(code, action) {
+	fmtInstaceFuture ??= WebAssembly.instantiateStreaming(fetch("/hbfmt.wasm"), {});
+	fmtInstance ??= (await fmtInstaceFuture).instance;
 
-/** @param {WebAssembly.Instance} instance @param {string} code @param {"fmt" | "minify"} action @returns {string | undefined} */
-function modifyCodeSync(instance, code, action) {
 	let {
 		INPUT, INPUT_LEN,
 		OUTPUT, OUTPUT_LEN,
 		PANIC_MESSAGE, PANIC_MESSAGE_LEN,
 		memory, fmt, minify
-	} = instance.exports;
+	} = fmtInstance.exports;
 
 	if (!(true
 		&& INPUT instanceof WebAssembly.Global
@@ -136,17 +138,36 @@ function wireUp(target) {
 	execApply(target);
 	cacheInputs(target);
 	bindTextareaAutoResize(target);
+	bindCodeEdit(target);
 }
 
 /** @type {{ [key: string]: (content: string) => Promise<string> | string }} */
 const applyFns = {
 	timestamp: (content) => new Date(parseInt(content) * 1000).toLocaleString(),
-	fmt: (content) => {
-		let res = modifyCode(content, "fmt");
-		return res instanceof Promise ? res.then(c => c ?? content) : res ?? content;
-	},
+	fmt: (content) => modifyCode(content, "fmt").then(c => c ?? "post has invalid code"),
 };
 
+/** @param {HTMLElement} target */
+async function bindCodeEdit(target) {
+	const edit = target.querySelector("#code-edit");
+	if (!(edit instanceof HTMLTextAreaElement)) return;
+	const errors = target.querySelector("#compiler-output");
+	if (!(errors instanceof HTMLPreElement)) never();
+
+	const hbc = await getHbcInstance();
+
+	const debounce = 0;
+	let timeout = 0;
+	edit.addEventListener("input", () => {
+		if (timeout) clearTimeout(timeout);
+		timeout = setTimeout(() => {
+			const buf = packPosts([{ path: "local.hb", code: edit.value }]);
+			errors.textContent = compileCode(hbc, buf, 1);
+			timeout = 0;
+		}, debounce);
+	});
+}
+
 /** @param {HTMLElement} target */
 function execApply(target) {
 	for (const elem of target.querySelectorAll('[apply]')) {
@@ -175,23 +196,9 @@ function bindTextareaAutoResize(target) {
 		});
 
 		textarea.onkeydown = (ev) => {
-			const selecting = textarea.selectionStart !== textarea.selectionEnd;
-
 			if (ev.key === "Tab") {
 				ev.preventDefault();
-				document.execCommand('insertText', false, "    ");
-			}
-
-			if (ev.key === "Backspace" && textarea.selectionStart != 0 && !selecting) {
-				let i = textarea.selectionStart, looped = false;
-				while (textarea.value.charCodeAt(--i) === ' '.charCodeAt(0)) looped = true;
-				if (textarea.value.charCodeAt(i) === '\n'.charCodeAt(0) && looped) {
-					ev.preventDefault();
-					let toDelete = (textarea.selectionStart - (i + 1)) % 4;
-					if (toDelete === 0) toDelete = 4;
-					textarea.selectionStart -= toDelete;
-					document.execCommand('delete', false);
-				}
+				document.execCommand('insertText', false, "\t");
 			}
 		}
 	}
@@ -235,17 +242,13 @@ if (window.location.hostname === 'localhost') {
 			if (code != prev) console.error(code, prev);
 		}
 		{
-
-			const name = "foo.hb";
-			const code = "main:=fn():void{return 42}";
-			const buf = new Uint8Array(2 + name.length + 2 + code.length);
-			const view = new DataView(buf.buffer);
-			view.setUint16(0, name.length, true);
-			buf.set(new TextEncoder().encode(name), 2);
-			view.setUint16(2 + name.length, code.length, true);
-			buf.set(new TextEncoder().encode(code), 2 + name.length + 2);
-			const res = await compileCode(buf, 1) ?? never();
-			const expected = "";
+			const posts = [{
+				path: "foo.hb",
+				code: "main:=fn():int{return 42}",
+			}];
+			const buf = packPosts(posts);
+			const res = compileCode(await getHbcInstance(), buf, 1) ?? never();
+			const expected = "exit code: 42\n";
 			if (expected != res) console.error(expected, res);
 		}
 	})()
diff --git a/depell/src/main.rs b/depell/src/main.rs
index 1c5b198..3d08559 100644
--- a/depell/src/main.rs
+++ b/depell/src/main.rs
@@ -153,8 +153,9 @@ impl Page for Post {
                 <input name="author" type="text" value={session.name} hidden>
                 <input name="name" type="text" placeholder="name" value=name
                     required maxlength=MAX_POSTNAME_LENGTH>
-                <textarea name="code" placeholder="code" rows=1 required>code</textarea>
+                <textarea id="code-edit" name="code" placeholder="code" rows=1 required>code</textarea>
                 <input type="submit" value="submit">
+                <pre id="compiler-output"></pre>
             </form>
             !{include_str!("post-page.html")}
         }
diff --git a/depell/wasm-hbc/src/lib.rs b/depell/wasm-hbc/src/lib.rs
index aa932bb..98efa5a 100644
--- a/depell/wasm-hbc/src/lib.rs
+++ b/depell/wasm-hbc/src/lib.rs
@@ -18,7 +18,7 @@ wasm_rt::decl_buffer!(MAX_INPUT_SIZE, MAX_INPUT, INPUT, INPUT_LEN);
 unsafe fn compile_and_run(mut fuel: usize) {
     ALLOCATOR.reset();
 
-    log::set_logger(&wasm_rt::Logger).unwrap();
+    _ = log::set_logger(&wasm_rt::Logger);
     log::set_max_level(log::LevelFilter::Error);
 
     struct File<'a> {
@@ -81,7 +81,12 @@ unsafe fn compile_and_run(mut fuel: usize) {
                 let unknown = ct.vm.read_reg(2).0;
                 log::error!("unknown ecall: {unknown}")
             }
-            Ok(hbvm::VmRunOk::Timer) => fuel -= 1,
+            Ok(hbvm::VmRunOk::Timer) => {
+                fuel -= 1;
+                if fuel == 0 {
+                    log::error!("program timed out");
+                }
+            }
             Ok(hbvm::VmRunOk::Breakpoint) => todo!(),
             Err(e) => {
                 log::error!("vm error: {e}");
diff --git a/depell/wasm-rt/src/lib.rs b/depell/wasm-rt/src/lib.rs
index b698e73..c4afaa6 100644
--- a/depell/wasm-rt/src/lib.rs
+++ b/depell/wasm-rt/src/lib.rs
@@ -25,16 +25,18 @@ macro_rules! decl_buffer {
 #[macro_export]
 macro_rules! decl_runtime {
     ($memory_size:expr, $max_panic_size:expr) => {
+        #[cfg(debug_assertions)]
+        #[no_mangle]
+        static mut PANIC_MESSAGE: [u8; $max_panic_size] = [0; $max_panic_size];
+        #[cfg(debug_assertions)]
+        #[no_mangle]
+        static mut PANIC_MESSAGE_LEN: usize = 0;
+
         #[cfg(target_arch = "wasm32")]
         #[panic_handler]
         pub fn handle_panic(_info: &core::panic::PanicInfo) -> ! {
             #[cfg(debug_assertions)]
             {
-                #[no_mangle]
-                static mut PANIC_MESSAGE: [u8; $max_panic_size] = [0; $max_panic_size];
-                #[no_mangle]
-                static mut PANIC_MESSAGE_LEN: usize = 0;
-
                 unsafe {
                     use core::fmt::Write;
                     let mut f = $crate::Write(&mut PANIC_MESSAGE[..]);
@@ -52,6 +54,16 @@ macro_rules! decl_runtime {
         #[cfg(target_arch = "wasm32")]
         #[alloc_error_handler]
         fn alloc_error(_: core::alloc::Layout) -> ! {
+            #[cfg(debug_assertions)]
+            {
+                unsafe {
+                    use core::fmt::Write;
+                    let mut f = $crate::Write(&mut PANIC_MESSAGE[..]);
+                    _ = writeln!(f, "out of memory");
+                    PANIC_MESSAGE_LEN = $max_panic_size - f.0.len();
+                }
+            }
+
             core::arch::wasm32::unreachable()
         }
     };
diff --git a/xtask/src/main.rs b/xtask/src/main.rs
index ea925f4..7c683d7 100644
--- a/xtask/src/main.rs
+++ b/xtask/src/main.rs
@@ -52,7 +52,6 @@ fn main() -> io::Result<()> {
             build_wasm_blob("hbc", true)?;
             exec(build_cmd("gzip -k -f depell/src/index.js"))?;
             exec(build_cmd("gzip -k -f depell/src/index.css"))?;
-            exec(build_cmd("cargo run -p depell --features gzip"))?;
             Ok(())
         }
         "build-depell" => {
@@ -60,7 +59,12 @@ fn main() -> io::Result<()> {
             build_wasm_blob("hbc", false)?;
             exec(build_cmd("gzip -k -f depell/src/index.js"))?;
             exec(build_cmd("gzip -k -f depell/src/index.css"))?;
-            exec(build_cmd("cargo run -p depell --features gzip --release"))?;
+            Ok(())
+        }
+        "watch-depell" => {
+            let mut c = build_cmd("cargo watch --why");
+            c.arg("--exec=xtask build-depell-debug").arg("--exec=run -p depell");
+            exec(c)?;
             Ok(())
         }
         _ => Ok(()),