remote_server: Improve error reporting (#33770)

Closes #33736

Use `thiserror` to implement error stack and `anyhow` to report is to
user.
Also move some code from main to remote_server to have better crate
isolation.

Release Notes:

- N/A

---------

Co-authored-by: Kirill Bulatov <kirill@zed.dev>

crates/remote_server/src/remote_server.rs

@@ -6,4 +6,78 @@ pub mod unix;
 #[cfg(test)]
 mod remote_editing_tests;
 
+use clap::Subcommand;
+use std::path::PathBuf;
+
 pub use headless_project::{HeadlessAppState, HeadlessProject};
+
+#[derive(Subcommand)]
+pub enum Commands {
+    Run {
+        #[arg(long)]
+        log_file: PathBuf,
+        #[arg(long)]
+        pid_file: PathBuf,
+        #[arg(long)]
+        stdin_socket: PathBuf,
+        #[arg(long)]
+        stdout_socket: PathBuf,
+        #[arg(long)]
+        stderr_socket: PathBuf,
+    },
+    Proxy {
+        #[arg(long)]
+        reconnect: bool,
+        #[arg(long)]
+        identifier: String,
+    },
+    Version,
+}
+
+#[cfg(not(windows))]
+pub fn run(command: Commands) -> anyhow::Result<()> {
+    use anyhow::Context;
+    use release_channel::{RELEASE_CHANNEL, ReleaseChannel};
+    use unix::{ExecuteProxyError, execute_proxy, execute_run};
+
+    match command {
+        Commands::Run {
+            log_file,
+            pid_file,
+            stdin_socket,
+            stdout_socket,
+            stderr_socket,
+        } => execute_run(
+            log_file,
+            pid_file,
+            stdin_socket,
+            stdout_socket,
+            stderr_socket,
+        ),
+        Commands::Proxy {
+            identifier,
+            reconnect,
+        } => execute_proxy(identifier, reconnect)
+            .inspect_err(|err| {
+                if let ExecuteProxyError::ServerNotRunning(err) = err {
+                    std::process::exit(err.to_exit_code());
+                }
+            })
+            .context("running proxy on the remote server"),
+        Commands::Version => {
+            let release_channel = *RELEASE_CHANNEL;
+            match release_channel {
+                ReleaseChannel::Stable | ReleaseChannel::Preview => {
+                    println!("{}", env!("ZED_PKG_VERSION"))
+                }
+                ReleaseChannel::Nightly | ReleaseChannel::Dev => {
+                    println!(
+                        "{}",
+                        option_env!("ZED_COMMIT_SHA").unwrap_or(release_channel.dev_name())
+                    )
+                }
+            };
+            Ok(())
+        }
+    }
+}