From 43e3bf7b60de613258f4da7fc116bebaefc9c1f1 Mon Sep 17 00:00:00 2001
From: Lucas Schwiderski <lucas@lschwiderski.de>
Date: Fri, 26 Jul 2024 16:03:04 +0200
Subject: [PATCH] Add cmdline to tracing output

Can come in handy when other people report problems and show the error
message or full log, but not the command line.

Setting that span to `level = "error"` ensures that it won't be disabled
by level filters.
---
 crates/dtmt/src/main.rs | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/crates/dtmt/src/main.rs b/crates/dtmt/src/main.rs
index 2e10b17..e41e802 100644
--- a/crates/dtmt/src/main.rs
+++ b/crates/dtmt/src/main.rs
@@ -36,10 +36,21 @@ struct GlobalConfig {
 }
 
 #[tokio::main]
-#[tracing::instrument]
+#[tracing::instrument(level = "error", fields(cmd_line = tracing::field::Empty))]
 async fn main() -> Result<()> {
     color_eyre::install()?;
 
+    {
+        let span = tracing::Span::current();
+        if !span.is_disabled() {
+            let cmdline: String = std::env::args_os().fold(String::new(), |mut s, arg| {
+                s.push_str(&arg.to_string_lossy());
+                s
+            });
+            span.record("cmd_line", cmdline);
+        }
+    }
+
     let matches = command!()
         .subcommand_required(true)
         .arg(