Update to not recompile if code hasn't changed

Cargo.lock

@@ -52,6 +52,38 @@ dependencies = [
  "windows-sys",
 ]
 
+[[package]]
+name = "async-trait"
+version = "0.1.89"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9035ad2d096bed7955a320ee7e2230574d28fd3c3a0f186cbea1ff3c7eed5dbb"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "block-buffer"
+version = "0.10.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3078c7629b62d3f0439517fa394996acacc5cbc91c5a20d8c658e77abd503a71"
+dependencies = [
+ "generic-array",
+]
+
+[[package]]
+name = "bytes"
+version = "1.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e748733b7cbc798e1434b6ac524f0c1ff2ab456fe201501e6497c8417a4fc33"
+
+[[package]]
+name = "cfg-if"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9330f8b2ff13f34540b44e946ef35111825727b38d33286ef986142615121801"
+
 [[package]]
 name = "clap"
 version = "4.6.0"
@@ -116,12 +148,51 @@ dependencies = [
  "windows-sys",
 ]
 
+[[package]]
+name = "cpufeatures"
+version = "0.2.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "59ed5838eebb26a2bb2e58f6d5b5316989ae9d08bab10e0e6d103e656d1b0280"
+dependencies = [
+ "libc",
+]
+
+[[package]]
+name = "crypto-common"
+version = "0.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "78c8292055d1c1df0cce5d180393dc8cce0abec0a7102adb6c7b1eef6016d60a"
+dependencies = [
+ "generic-array",
+ "typenum",
+]
+
+[[package]]
+name = "digest"
+version = "0.10.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
+dependencies = [
+ "block-buffer",
+ "crypto-common",
+]
+
 [[package]]
 name = "equivalent"
 version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "877a4ace8713b0bcf2a4e7eec82529c029f1d0619886d18145fea96c3ffe5c0f"
 
+[[package]]
+name = "generic-array"
+version = "0.14.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "85649ca51fd72272d7821adaf274ad91c288277713d9c18820d8499a7ff69e9a"
+dependencies = [
+ "typenum",
+ "version_check",
+]
+
 [[package]]
 name = "glob"
 version = "0.3.3"
@@ -140,6 +211,12 @@ version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2304e00983f87ffb38b55b444b5e3b60a884b5d30c0fca7d82fe33449bbe55ea"
 
+[[package]]
+name = "hex"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7f24254aa9a54b5c858eaee2f5bccdb46aaf0e486a595ed5fd8f86ba55232a70"
+
 [[package]]
 name = "indexmap"
 version = "2.13.0"
@@ -156,6 +233,12 @@ version = "1.70.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a6cb138bb79a146c1bd460005623e142ef0181e3d0219cb493e02f7d08a35695"
 
+[[package]]
+name = "libc"
+version = "0.2.183"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b5b646652bf6661599e1da8901b3b9522896f01e736bad5f723fe7a3a27f899d"
+
 [[package]]
 name = "once_cell_polyfill"
 version = "1.70.2"
@@ -171,9 +254,16 @@ dependencies = [
  "colored",
  "glob",
  "serde",
+ "sha256",
  "toml",
 ]
 
+[[package]]
+name = "pin-project-lite"
+version = "0.2.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a89322df9ebe1c1578d689c92318e070967d1042b512afbe49518723f4e6d5cd"
+
 [[package]]
 name = "proc-macro2"
 version = "1.0.106"
@@ -231,6 +321,30 @@ dependencies = [
  "serde_core",
 ]
 
+[[package]]
+name = "sha2"
+version = "0.10.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a7507d819769d01a365ab707794a4084392c824f54a7a6a7862f8c3d0892b283"
+dependencies = [
+ "cfg-if",
+ "cpufeatures",
+ "digest",
+]
+
+[[package]]
+name = "sha256"
+version = "1.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f880fc8562bdeb709793f00eb42a2ad0e672c4f883bbe59122b926eca935c8f6"
+dependencies = [
+ "async-trait",
+ "bytes",
+ "hex",
+ "sha2",
+ "tokio",
+]
+
 [[package]]
 name = "strsim"
 version = "0.11.1"
@@ -248,6 +362,16 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "tokio"
+version = "1.50.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "27ad5e34374e03cfffefc301becb44e9dc3c17584f414349ebe29ed26661822d"
+dependencies = [
+ "bytes",
+ "pin-project-lite",
+]
+
 [[package]]
 name = "toml"
 version = "1.0.7+spec-1.1.0"
@@ -287,6 +411,12 @@ version = "1.0.7+spec-1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f17aaa1c6e3dc22b1da4b6bba97d066e354c7945cac2f7852d4e4e7ca7a6b56d"
 
+[[package]]
+name = "typenum"
+version = "1.19.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "562d481066bde0658276a35467c4af00bdc6ee726305698a55b86e61d7ad82bb"
+
 [[package]]
 name = "unicode-ident"
 version = "1.0.24"
@@ -299,6 +429,12 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "06abde3611657adf66d383f00b093d7faecc7fa57071cce2578660c9f1010821"
 
+[[package]]
+name = "version_check"
+version = "0.9.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b928f33d975fc6ad9f86c8f283853ad26bdd5b10b7f1542aa2fa15e2289105a"
+
 [[package]]
 name = "windows-link"
 version = "0.2.1"

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "pallet"
-version = "1.0.4"
+version = "1.0.5"
 edition = "2024"
 description = "A project manager and build system for C inspired by Rust's Cargo"
 
@@ -10,4 +10,5 @@ clap_complete = "4.6.0"
 colored = "3.1.1"
 glob = "0.3.3"
 serde = { version = "1.0.228", features = ["derive"] }
+sha256 = "1.6.0"
 toml = "1.0.7"

PKGBUILD

@@ -1,6 +1,6 @@
 # Maintainer: Shea Frembling <sfrembling@gmail.com>
 pkgname=pallet
-pkgver=1.0.4
+pkgver=1.0.5
 pkgrel=1
 pkgdesc="A simple C project manager inspired by Cargo"
 arch=('x86_64')

src/app.rs

@@ -245,6 +245,22 @@ fn build(mode: &Option<String>) -> std::io::Result<()> {
 
     std::fs::create_dir_all(format!("target/{}", build_config.name))?;
 
+    let hash = hash_src_tree()?;
+
+    let old_compute_path = PathBuf::from(format!("target/{}/.build_hash", build_config.name));
+
+    if old_compute_path.exists() {
+        let text = std::fs::read_to_string(old_compute_path)?;
+
+        if hash.trim() == text.trim() {
+            println!(
+                "   {} (code not changed, recompile not made)",
+                "Finished".green().bold()
+            );
+            return Ok(());
+        }
+    }
+
     let mut command = Command::new("gcc");
 
     for arg in &build_config.args {
@@ -280,6 +296,18 @@ fn build(mode: &Option<String>) -> std::io::Result<()> {
     Ok(())
 }
 
+fn hash_src_tree() -> std::io::Result<String> {
+    let mut hashes = String::new();
+    for entry in glob("src/").expect("a valid glob pattern") {
+        if let Ok(file) = entry {
+            let text = std::fs::read_to_string(file)?;
+            let hash = sha256::digest(text);
+            hashes.push_str(hash.as_str());
+        }
+    }
+    Ok(sha256::digest(hashes))
+}
+
 fn run(mode: &Option<String>, args: Option<Vec<String>>) -> std::io::Result<()> {
     let conf = match get_config() {
         Some(conf) => conf,