feat: wayland connection, niri IPC and valw doctor

src/main.rs

@@ -3,20 +3,64 @@
 
 mod config;
 mod detach;
+mod doctor;
 mod error;
 mod frame;
 mod lock;
 mod log;
+mod niri;
 mod output;
 mod render;
 mod selection;
+mod wayland;
 
-use clap::Parser;
+use std::process::ExitCode;
+
+use anyhow::Result;
+use chrono::Local;
+use clap::{Parser, Subcommand};
+
+use crate::error::Cancelled;
 
 #[derive(Parser)]
 #[command(version, about = "macOS-style screenshots for niri")]
-struct Cli {}
+struct Cli {
+    #[command(subcommand)]
+    command: Command,
+}
 
-fn main() {
-    Cli::parse();
+#[derive(Subcommand)]
+enum Command {
+    /// Report what the compositor and system support.
+    Doctor,
+}
+
+fn main() -> ExitCode {
+    let cli = Cli::parse();
+    let log = log::init(&log::default_dir(), Local::now());
+    log::install_panic_hook(log.clone());
+    tracing::info!(
+        "valw {} {:?}",
+        env!("CARGO_PKG_VERSION"),
+        std::env::args().collect::<Vec<_>>()
+    );
+
+    match run(cli) {
+        Ok(()) => ExitCode::SUCCESS,
+        Err(e) if e.downcast_ref::<Cancelled>().is_some() => {
+            tracing::info!("cancelled by the user");
+            ExitCode::from(3)
+        }
+        Err(e) => {
+            tracing::error!("{e:#}");
+            eprint!("{}", error::render(&e, log.as_deref()));
+            ExitCode::FAILURE
+        }
+    }
+}
+
+fn run(cli: Cli) -> Result<()> {
+    match cli.command {
+        Command::Doctor => doctor::run(),
+    }
 }