Remove dependencies and simplify CLI, also adding eww ping command

Cargo.toml

@@ -26,24 +26,17 @@ structopt = "0.3"
 serde = {version = "1.0", features = ["derive"]}
 extend = "0.3.0"
 grass = "0.10"
-hotwatch = "0.4"
-crossbeam-channel = "0.4"
 num = "0.3"
-stoppable_thread = "0.2"
 roxmltree = "0.13"
 itertools = "0.9"
-scheduled-executor = "0.4"
 debug_stub_derive = "0.3"
 log = "0.4"
 pretty_env_logger = "0.4"
 lazy_static = "1.4.0"
 libc = "0.2"
-popol = "0.3"
 nix = "0.19"
 smart-default = "0.6"
-filedescriptor = "0.7"
 simple-signal = "1.1"
-dashmap = "3.11"
 unescape = "0.1"
 
 tokio = { version = "1.0", features = ["full"] }

src/main.rs

@@ -53,11 +53,12 @@ fn main() {
             }
             opts::Action::WithServer(action) => {
                 log::info!("Trying to find server process");
-                if let Ok(stream) = net::UnixStream::connect(&*IPC_SOCKET_PATH) {
+                if let Some(stream) = try_connect(&*IPC_SOCKET_PATH) {
                     log::info!("Connected to eww server.");
                     client::forward_command_to_server(stream, action).context("Error while forwarding command to server")?;
                 } else if action.needs_server_running() {
                     println!("No eww server running");
+                    std::process::exit(1);
                 } else {
                     log::info!("No server running, initializing server...");
                     let _ = std::fs::remove_file(&*crate::IPC_SOCKET_PATH);
@@ -71,3 +72,14 @@ fn main() {
         eprintln!("{:?}", e);
     }
 }
+
+fn try_connect(path: &std::path::PathBuf) -> Option<net::UnixStream> {
+    if path.exists() {
+        for _ in 0..5 {
+            if let Ok(stream) = net::UnixStream::connect(&*IPC_SOCKET_PATH) {
+                return Some(stream);
+            }
+        }
+    }
+    return None;
+}

src/opts.rs

@@ -18,20 +18,14 @@ pub struct Opt {
 #[derive(StructOpt, Debug, Serialize, Deserialize, PartialEq)]
 struct RawOpt {
     #[structopt(subcommand)]
-    action: Option<Action>,
-
-    /// Run Eww in the background, daemonizing it.
-    /// When daemonized, to kill eww you can run `eww kill`. To see logs, use `eww logs`.
-    #[structopt(short = "-d", long = "--detach")]
-    should_detach: bool,
+    action: Action,
 }
 
-#[derive(StructOpt, Debug, Serialize, Deserialize, PartialEq, smart_default::SmartDefault)]
+#[derive(StructOpt, Debug, Serialize, Deserialize, PartialEq)]
 pub enum Action {
     #[structopt(flatten)]
     ClientOnly(ActionClientOnly),
 
-    #[default]
     #[structopt(flatten)]
     WithServer(ActionWithServer),
 }
@@ -43,12 +37,16 @@ pub enum ActionClientOnly {
     Logs,
 }
 
-#[derive(StructOpt, Debug, Serialize, Deserialize, PartialEq, smart_default::SmartDefault)]
+#[derive(StructOpt, Debug, Serialize, Deserialize, PartialEq)]
 pub enum ActionWithServer {
+    /// Start the eww daemon.
     #[structopt(name = "daemon")]
-    #[default]
     Daemon,
 
+    /// Ping the eww server, checking if it is reachable.
+    #[structopt(name = "ping")]
+    Ping,
+
     /// Update the value of a variable, in a running eww instance
     #[structopt(name = "update")]
     Update {
@@ -109,10 +107,9 @@ impl Opt {
 
 impl From<RawOpt> for Opt {
     fn from(other: RawOpt) -> Self {
-        let RawOpt { action, should_detach } = other;
-        let action = action.unwrap_or_default();
+        let RawOpt { action } = other;
         Opt {
-            should_detach: should_detach || action == Action::WithServer(ActionWithServer::Daemon),
+            should_detach: action == Action::WithServer(ActionWithServer::Daemon),
             action,
         }
     }
@@ -128,7 +125,7 @@ fn parse_var_update_arg(s: &str) -> Result<(VarName, PrimitiveValue)> {
 impl ActionWithServer {
     pub fn into_eww_command(self) -> (app::EwwCommand, Option<tokio::sync::mpsc::UnboundedReceiver<String>>) {
         let command = match self {
-            ActionWithServer::Daemon => app::EwwCommand::NoOp,
+            ActionWithServer::Daemon | ActionWithServer::Ping => app::EwwCommand::NoOp,
             ActionWithServer::Update { mappings } => app::EwwCommand::UpdateVars(mappings.into_iter().collect()),
             ActionWithServer::OpenWindow {
                 window_name,