Add --async command line switch.

Cargo.lock

@@ -11,6 +11,15 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "ansi_term"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ee49baf6cb617b853aa8d93bf420db2383fab46d314482ca2803b40d5fde979b"
+dependencies = [
+ "winapi 0.3.9",
+]
+
 [[package]]
 name = "async-stream"
 version = "0.3.2"
@@ -113,6 +122,21 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
+[[package]]
+name = "clap"
+version = "2.33.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "37e58ac78573c40708d45522f0d80fa2f01cc4f9b4e2bf749807255454312002"
+dependencies = [
+ "ansi_term",
+ "atty",
+ "bitflags 1.2.1",
+ "strsim",
+ "textwrap",
+ "unicode-width",
+ "vec_map",
+]
+
 [[package]]
 name = "cloudabi"
 version = "0.0.3"
@@ -1098,6 +1122,7 @@ checksum = "fe0f37c9e8f3c5a4a66ad655a93c74daac4ad00c441533bf5c6e7990bb42604e"
 name = "solstice-client"
 version = "0.1.0"
 dependencies = [
+ "clap",
  "crossbeam-channel",
  "env_logger",
  "log 0.4.14",
@@ -1139,6 +1164,12 @@ dependencies = [
  "tokio-io",
 ]
 
+[[package]]
+name = "strsim"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
+
 [[package]]
 name = "syn"
 version = "1.0.73"
@@ -1159,6 +1190,15 @@ dependencies = [
  "winapi-util",
 ]
 
+[[package]]
+name = "textwrap"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d326610f408c7a4eb6f51c37c330e496b08506c9457c9d34287ecc38809fb060"
+dependencies = [
+ "unicode-width",
+]
+
 [[package]]
 name = "thiserror"
 version = "1.0.26"
@@ -1464,6 +1504,12 @@ dependencies = [
  "tinyvec",
 ]
 
+[[package]]
+name = "unicode-width"
+version = "0.1.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9337591893a19b88d8d87f2cec1e73fad5cdfd10e5a6f349f498ad6ea2ffb1e3"
+
 [[package]]
 name = "unicode-xid"
 version = "0.2.2"
@@ -1481,6 +1527,12 @@ dependencies = [
  "percent-encoding",
 ]
 
+[[package]]
+name = "vec_map"
+version = "0.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f1bddf1187be692e79c5ffeab891132dfb0f236ed36a43c7ed39f1165ee20191"
+
 [[package]]
 name = "wasi"
 version = "0.10.0+wasi-snapshot-preview1"

client/Cargo.toml

@@ -5,6 +5,7 @@ authors = ["letitz"]
 edition = "2018"
 
 [dependencies]
+clap = "^2.33"
 crossbeam-channel = "^0.3"
 env_logger = "^0.8"
 log = "^0.4"

client/src/main.rs

@@ -4,6 +4,7 @@ extern crate log;
 
 use std::thread;
 
+use clap::{App, Arg};
 use crossbeam_channel;
 use env_logger;
 use solstice_proto;
@@ -24,9 +25,7 @@ mod message_handler;
 mod room;
 mod user;
 
-fn main() {
-  env_logger::init();
-
+fn old_main() {
   let (proto_to_client_tx, proto_to_client_rx) = crossbeam_channel::unbounded();
 
   let mut proto_agent = match solstice_proto::Agent::new(proto_to_client_tx) {
@@ -51,3 +50,27 @@ fn main() {
   thread::spawn(move || proto_agent.run().unwrap());
   client.run();
 }
+
+fn async_main() {
+  // TODO
+}
+
+fn main() {
+  env_logger::init();
+
+  let matches = App::new("solstice-client")
+    .version("0.1")
+    .author("letitz")
+    .arg(
+      Arg::with_name("async")
+        .long("async")
+        .help("Use the new async engine."),
+    )
+    .get_matches();
+
+  if matches.is_present("async") {
+    async_main();
+  } else {
+    old_main();
+  }
+}