ANW-10 bootstrap anwesen crate and CLI skeleton

src/main.rs

@@ -0,0 +1,49 @@
+//! Anwesen: read-only HTTP daemon over a markdown vault.
+//!
+//! This module wires the CLI to the (still-stub) `serve` and `doctor`
+//! subcommands. The full daemon arrives over [ANW-11..ANW-19].
+
+mod cli;
+
+use anyhow::Result;
+use clap::Parser;
+
+use crate::cli::{Cli, Command};
+
+// Result is retained at the binary boundary per [[ADR-001 Language and
+// Foundation Libraries]] (anyhow at main); current stubs do not yet
+// surface errors.
+#[allow(clippy::unnecessary_wraps)]
+fn main() -> Result<()> {
+    let cli = Cli::parse();
+    match cli.command {
+        Command::Serve(args) => {
+            init_logging(args.log_level);
+            tracing::info!(
+                vault = %args.vault.display(),
+                bind = %args.bind,
+                "anwesen serve: not yet implemented (ANW-10 stub)"
+            );
+        }
+        Command::Doctor(args) => {
+            init_logging(args.log_level);
+            tracing::info!(
+                vault = %args.vault.display(),
+                "anwesen doctor: not yet implemented (ANW-10 stub)"
+            );
+        }
+        Command::Version => {
+            println!("{}", env!("CARGO_PKG_VERSION"));
+        }
+    }
+    Ok(())
+}
+
+fn init_logging(level: cli::LogLevel) {
+    let filter = tracing_subscriber::EnvFilter::try_from_env("ANWESEN_LOG")
+        .unwrap_or_else(|_| tracing_subscriber::EnvFilter::new(level.as_filter_directive()));
+    let _ = tracing_subscriber::fmt()
+        .with_env_filter(filter)
+        .with_writer(std::io::stderr)
+        .try_init();
+}