chore: add more error messaging for bencher (#383)

Author: makspll

crates/xtask/src/main.rs

@@ -1217,10 +1217,10 @@ impl Xtasks {
     fn bench(app_settings: GlobalArgs) -> Result<()> {
         // first of all figure out which branch we're on
         // run // git rev-parse --abbrev-ref HEAD
-
+        let workspace_dir = Self::workspace_dir(&app_settings).unwrap();
         let command = Command::new("git")
             .args(["rev-parse", "--abbrev-ref", "HEAD"])
-            .current_dir(Self::workspace_dir(&app_settings).unwrap())
+            .current_dir(workspace_dir.clone())
             .output()
             .with_context(|| "Trying to figure out which branch we're on in benchmarking")?;
         let branch = String::from_utf8(command.stdout)?;
@@ -1251,7 +1251,6 @@ impl Xtasks {
         bencher_cmd
             .stdout(std::process::Stdio::inherit())
             .stderr(std::process::Stdio::inherit())
-            .current_dir(Self::workspace_dir(&app_settings).unwrap())
             .arg("run")
             .args(["--project", "bms"])
             .args(["--branch", &format!("\"{branch}\"")])
@@ -1277,7 +1276,11 @@ impl Xtasks {
             .args(["--adapter", "rust_criterion"])
             .arg("cargo bench --features=lua54");
 
-        let out = bencher_cmd.output()?;
+        log::info!("Running bencher command: {:?}", bencher_cmd);
+
+        let out = bencher_cmd
+            .output()
+            .with_context(|| "Could not trigger bencher command")?;
         if !out.status.success() {
             bail!("Failed to run bencher: {:?}", out);
         }
@@ -1495,6 +1498,25 @@ impl Xtasks {
             )?;
         }
 
+        // install bencher
+        // linux curl --proto '=https' --tlsv1.2 -sSfL https://bencher.dev/download/install-cli.sh | sh
+        // windows irm https://bencher.dev/download/install-cli.ps1 | iex
+        Self::run_system_command(
+            &app_settings,
+            "cargo",
+            "Failed to install bencher",
+            vec![
+                "install",
+                "--git",
+                "https://github.com/bencherdev/bencher",
+                "--branch",
+                "main",
+                "--locked",
+                "--force",
+                "bencher_cli",
+            ],
+            None,
+        )?;
         // install cargo mdbook
         Self::run_system_command(
             &app_settings,