feat: add more useful debug information to system metadata

engine/build.rs

@@ -1,3 +1,99 @@
-fn main() {
-    built::write_built_file().expect("Failed to write build information");
+use std::process::Command;
+use std::env;
+use std::path::Path;
+use std::fs::OpenOptions;
+use std::io::Write;
+use build_print::*;
+use cargo_lock::Lockfile;
+
+fn get_git_info() -> String {
+    match Command::new("git").arg("describe").arg("--always").arg("--dirty").output() {
+        Ok(output) if output.status.success() => {
+            String::from_utf8_lossy(&output.stdout).trim().to_string()
+        }
+        _ => {
+            match Command::new("git").arg("rev-parse").arg("--abbrev-ref").arg("HEAD").output() {
+                Ok(output) if output.status.success() => {
+                    let head = String::from_utf8_lossy(&output.stdout);
+                    let head = head.trim();
+                    if head == "HEAD" {
+                        "DETACHED".to_string()
+                    } else {
+                        //TDDO: properly parse branch hashes
+                        format!("BRANCH: {}", head)
+                    }
+                }
+                _ => "UNKNOWN".to_string(),
+            }
+        }
+    }
 }
+
+fn main() {
+    if let Err(e) = built::write_built_file() {
+        panic!("{e}");
+    }
+    let out_dir = env::var("OUT_DIR").unwrap();
+    let dest_path = Path::new(&out_dir).join("built.rs");
+    let proj_root = env!("CARGO_MANIFEST_DIR").to_string();
+    let tmp = format!("{}/../Cargo.lock",proj_root);
+    let lockfile_path = Path::new(&tmp).canonicalize().expect("INvalid");
+
+
+    let cargo_version = match Command::new("cargo").arg("--version").output() {
+        Ok(output) if output.status.success() => {
+            String::from_utf8_lossy(&output.stdout).trim().to_string()
+        }
+        _ => "unknown".to_string(),
+    };
+    info!("{cargo_version}");
+
+    let rustc_version = match Command::new("rustc").arg("--version").output() {
+        Ok(output) if output.status.success() => {
+            String::from_utf8_lossy(&output.stdout).trim().to_string()
+        }
+        _ => "unknown".to_string(),
+    };
+    info!("{rustc_version}");
+
+    let git_info = get_git_info();
+    info!("Git Info: {}", git_info);
+
+    let mut built_rs = match OpenOptions::new().append(true).open(&dest_path) {
+        Ok(file) => file,
+        Err(e) => {
+            error!("Could not open built.rs for appending: {}", e);
+            return;
+        }
+    };
+
+    writeln!(built_rs, "pub const GIT_COMMIT_HASH: &str = \"{}\";", git_info).unwrap();
+
+    match Lockfile::load(lockfile_path) {
+        Ok(lockfile) => {
+            let dependencies_to_track = ["tokio", "winit", "wgpu"];
+
+            for package in lockfile.packages {
+                let name = package.name.as_str();
+                    if dependencies_to_track.contains(&name) {
+                        let version = package.version.to_string();
+                        writeln!(
+                            built_rs,
+                            "pub const {}_VERSION: &str = \"{}\";",
+                            name.to_uppercase().replace('-', "_"),
+                            version
+                        )
+                        .unwrap();
+                    }
+            }
+        }
+        Err(e) => {
+            error!("Error loading Cargo.lock: {}", e);
+        }
+    }
+
+
+    std::println!("cargo:rerun-if-changed=Cargo.lock");
+    std::println!("cargo:rerun-if-changed=.git/HEAD");
+    std::println!("cargo:rerun-if-changed=.git/index");
+}