Merge branch 'wt/self-update' — add gitpane update command

Author: affromero

src/main.rs

@@ -9,7 +9,7 @@ mod tui;
 mod update_checker;
 mod watcher;
 
-use clap::Parser;
+use clap::{Parser, Subcommand};
 use color_eyre::Result;
 use std::path::PathBuf;
 
@@ -23,12 +23,27 @@ struct Cli {
     /// UI frame rate (deprecated — rendering is now on-demand)
     #[arg(long, default_value_t = 10, hide = true)]
     frame_rate: u16,
+
+    #[command(subcommand)]
+    command: Option<Command>,
+}
+
+#[derive(Subcommand, Debug)]
+enum Command {
+    /// Update gitpane to the latest version via cargo install
+    Update,
 }
 
 #[tokio::main]
 async fn main() -> Result<()> {
     color_eyre::install()?;
 
+    let cli = Cli::parse();
+
+    if let Some(Command::Update) = cli.command {
+        return self_update();
+    }
+
     tracing_subscriber::fmt()
         .with_env_filter(
             tracing_subscriber::EnvFilter::from_default_env()
@@ -37,7 +52,6 @@ async fn main() -> Result<()> {
         .with_writer(std::io::stderr)
         .init();
 
-    let cli = Cli::parse();
     let mut config = config::Config::load()?;
 
     if let Some(root) = cli.root {
@@ -50,3 +64,35 @@ async fn main() -> Result<()> {
 
     Ok(())
 }
+
+fn self_update() -> Result<()> {
+    let current = env!("CARGO_PKG_VERSION");
+    println!("gitpane v{current} — checking for updates...");
+
+    if let Some(latest) = update_checker::check_latest() {
+        println!("New version available: v{latest}");
+    } else {
+        println!("Already up to date.");
+        return Ok(());
+    }
+
+    println!("Running: cargo install gitpane");
+    let status = std::process::Command::new("cargo")
+        .args(["install", "gitpane"])
+        .status();
+
+    match status {
+        Ok(s) if s.success() => println!("Updated successfully."),
+        Ok(s) => {
+            eprintln!("cargo install exited with {s}");
+            std::process::exit(1);
+        }
+        Err(e) => {
+            eprintln!("Failed to run cargo: {e}");
+            eprintln!("Make sure cargo is installed (https://rustup.rs)");
+            std::process::exit(1);
+        }
+    }
+
+    Ok(())
+}