From 9e74e6f9139f56ddb07c6c759d7c52fc24545458 Mon Sep 17 00:00:00 2001
From: Bryan Helmkamp <bryan@brynary.com>
Date: Mon, 2 Mar 2026 12:13:59 -0500
Subject: [PATCH] Add `--debug` global CLI flag to switch log level from INFO
 to DEBUG

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
---
 crates/arc-cli/src/logging.rs | 6 ++++--
 crates/arc-cli/src/main.rs    | 6 +++++-
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/crates/arc-cli/src/logging.rs b/crates/arc-cli/src/logging.rs
index d7d603e6c..28cf23bdd 100644
--- a/crates/arc-cli/src/logging.rs
+++ b/crates/arc-cli/src/logging.rs
@@ -1,8 +1,10 @@
 use anyhow::{Context, Result};
 use tracing_subscriber::{fmt, layer::SubscriberExt, util::SubscriberInitExt, EnvFilter};
 
-pub fn init_tracing() -> Result<()> {
-    let filter = EnvFilter::try_from_env("ARC_LOG").unwrap_or_else(|_| EnvFilter::new("info"));
+pub fn init_tracing(debug: bool) -> Result<()> {
+    let default_level = if debug { "debug" } else { "info" };
+    let filter =
+        EnvFilter::try_from_env("ARC_LOG").unwrap_or_else(|_| EnvFilter::new(default_level));
 
     let log_dir = dirs::home_dir()
         .map(|h| h.join(".arc").join("logs"))
diff --git a/crates/arc-cli/src/main.rs b/crates/arc-cli/src/main.rs
index 4b59bc845..acca195ae 100644
--- a/crates/arc-cli/src/main.rs
+++ b/crates/arc-cli/src/main.rs
@@ -11,6 +11,10 @@ struct Cli {
     #[arg(long, global = true)]
     no_dotenv: bool,
 
+    /// Enable DEBUG-level logging (default is INFO)
+    #[arg(long, global = true)]
+    debug: bool,
+
     #[command(subcommand)]
     command: Command,
 }
@@ -65,7 +69,7 @@ async fn main() -> Result<()> {
         dotenvy::dotenv().ok();
     }
 
-    if let Err(err) = logging::init_tracing() {
+    if let Err(err) = logging::init_tracing(cli.debug) {
         eprintln!("Warning: failed to initialize logging: {err:#}");
     }