From 4bf97e9f19121bb989d57013ca9cbdf7dbde8576 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 a36e58d..04a42fe 100644
--- a/crates/dtmt/src/main.rs
+++ b/crates/dtmt/src/main.rs
@@ -38,10 +38,21 @@ 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(