From 270792ff386425d931ae559f0cf4eb0af2b317f2 Mon Sep 17 00:00:00 2001
From: Lucas Schwiderski <lucas@lschwiderski.de>
Date: Wed, 12 Apr 2023 16:17:39 +0200
Subject: [PATCH] feat: Implement daemon/client split

---
 Cargo.lock  | 700 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml  |   4 +
 src/main.rs | 108 +++++++-
 3 files changed, 810 insertions(+), 2 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index 54e9674..1b64983 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,6 +2,706 @@
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+ "windows_aarch64_gnullvm 0.42.2",
+ "windows_aarch64_msvc 0.42.2",
+ "windows_i686_gnu 0.42.2",
+ "windows_i686_msvc 0.42.2",
+ "windows_x86_64_gnu 0.42.2",
+ "windows_x86_64_gnullvm 0.42.2",
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+ "windows_i686_msvc 0.48.0",
+ "windows_x86_64_gnu 0.48.0",
+ "windows_x86_64_gnullvm 0.48.0",
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+dependencies = [
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+]
diff --git a/Cargo.toml b/Cargo.toml
index 4988650..de948c8 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,3 +6,7 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+clap = { version = "4.2.1", features = ["cargo", "color", "unicode", "std", "derive"] }
+color-eyre = "0.6.2"
+serde = { version = "1.0.160", features = ["derive"] }
+toml = "0.7.3"
diff --git a/src/main.rs b/src/main.rs
index e7a11a9..0d93f9f 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,107 @@
-fn main() {
-    println!("Hello, world!");
+use std::fs;
+use std::io::{stdin, ErrorKind, Read, Write};
+use std::os::unix::net::{UnixListener, UnixStream};
+use std::path::PathBuf;
+use std::thread;
+
+use clap::{Parser, Subcommand};
+use color_eyre::eyre::Context;
+use color_eyre::Result;
+use serde::Deserialize;
+
+#[derive(Parser)]
+#[command(author, version, about, long_about = None)]
+struct Cli {
+    /// Set the level of verbosity
+    #[arg(short, long, action = clap::ArgAction::Count)]
+    verbose: u8,
+    /// The command to run
+    #[command(subcommand)]
+    command: Command,
+}
+
+#[derive(Subcommand)]
+enum Command {
+    /// Send a request payload to a running daemon and wait for the response
+    Request,
+    /// Start a daemon
+    Daemon {
+        /// The Kakoune session this daemon belongs to
+        session: String,
+    },
+}
+
+#[derive(Clone, Debug, Deserialize)]
+struct Request {
+    session: String,
+}
+
+fn main() -> Result<()> {
+    let cli = Cli::parse();
+
+    let runtime_dir = std::env::var("XDG_RUNTIME_DIR")
+        .map(PathBuf::from)
+        .unwrap_or_else(|_| "/var".into())
+        .join("kak-highlight");
+
+    match cli.command {
+        Command::Daemon { session } => {
+            if let Err(err) = fs::metadata(&runtime_dir) {
+                if err.kind() == ErrorKind::NotFound {
+                    fs::create_dir_all(&runtime_dir).wrap_err_with(|| {
+                        format!(
+                            "Failed to create runtime directory {}",
+                            runtime_dir.display()
+                        )
+                    })?;
+                }
+            }
+
+            let path = runtime_dir.join(session).with_extension("s");
+            let listener = UnixListener::bind(&path)
+                .wrap_err_with(|| format!("Failed to bind listener to {}", path.display()))?;
+
+            for stream in listener.incoming() {
+                let stream = stream.wrap_err("Failed to accept incoming connection")?;
+                thread::spawn(|| {
+                    if let Err(err) = handle_connection(stream) {
+                        eprintln!("{:?}", err);
+                    }
+                });
+            }
+
+            Ok(())
+        }
+        Command::Request => {
+            let mut buf = String::new();
+            stdin()
+                .read_to_string(&mut buf)
+                .wrap_err("Failed to read stdin")?;
+            let mut socket = {
+                let req: Request = toml::from_str(&buf).wrap_err("Failed to parse request")?;
+                let path = runtime_dir.join(req.session).with_extension("s");
+
+                UnixStream::connect(&path).wrap_err_with(|| {
+                    format!("Failed to connect to daemon socket {}", path.display())
+                })?
+            };
+
+            socket
+                .write_all(buf.as_bytes())
+                .wrap_err("Failed to send response")?;
+
+            Ok(())
+        }
+    }
+}
+
+fn handle_connection(mut read: impl Read) -> Result<()> {
+    let mut buf = String::new();
+    read.read_to_string(&mut buf)
+        .wrap_err("Failed to read stdin")?;
+    let req: Request = toml::from_str(&buf).wrap_err("Failed to parse request")?;
+
+    dbg!(req);
+
+    todo!();
 }