fix(cli): automatically determine version

.gitignore

@@ -2,3 +2,6 @@
 .vscode
 .idea
 Cargo.lock
+
+# build script artifacts
+cli/LIBRARY_VERSION

cli/Cargo.toml

@@ -31,3 +31,6 @@ features = ["compile"]
 [dependencies.clap]
 version = "3"
 features = ["derive"]
+
+[build-dependencies]
+cargo_toml = "0.15.2"

cli/build.rs

@@ -0,0 +1,20 @@
+use std::path::PathBuf;
+
+use cargo_toml::Manifest;
+
+const ROOT: &str = env!("CARGO_MANIFEST_DIR");
+
+fn main() {
+    let manifest = Manifest::from_path(PathBuf::from_iter([ROOT, "Cargo.toml"])).unwrap();
+    let version = manifest
+        .dependencies
+        .get("cambridge-asm")
+        .unwrap()
+        .detail()
+        .unwrap()
+        .version
+        .as_ref()
+        .unwrap();
+
+    std::fs::write(PathBuf::from_iter([ROOT, "LIBRARY_VERSION"]), version).unwrap();
+}

cli/src/main.rs

@@ -15,7 +15,7 @@ use std::ffi::OsString;
 
 #[derive(Parser)]
 #[clap(name = "Cambridge Pseudoassembly Interpreter")]
-#[clap(version = concat!(env!("CARGO_PKG_VERSION"), "\n", "Library version 0.18.0"))]
+#[clap(version = concat!("v", env!("CARGO_PKG_VERSION"), "\nCambridge Pseudoassembly v", include_str!("../LIBRARY_VERSION")))]
 #[clap(author = "Saadi Save <github.com/SaadiSave>")]
 #[clap(about = "Run pseudoassembly from Cambridge International syllabus 9618 (2021)")]
 enum Commands {