From 313ba1170fe3f72bcb308ea4002113ea1fca5143 Mon Sep 17 00:00:00 2001
From: tho <tho@b0x.me>
Date: Sun, 15 Nov 2020 00:22:04 -0800
Subject: [PATCH] only allow one instance

---
 Cargo.lock  | 44 +++++++++++++++++++++++++++++++++++++++++---
 Cargo.toml  |  7 +------
 src/main.rs |  5 +++++
 3 files changed, 47 insertions(+), 9 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index bece4b5..0a5e88f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -157,6 +157,18 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "single-instance"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e5cf81b17aaa439345566aff22f4e0c11a50c265f6d5589ab693e40913326385"
+dependencies = [
+ "failure",
+ "libc",
+ "widestring",
+ "winapi",
+]
+
 [[package]]
 name = "swayipc"
 version = "2.7.0"
@@ -173,9 +185,7 @@ dependencies = [
 name = "swkb"
 version = "0.2.4"
 dependencies = [
- "failure",
- "serde",
- "serde_json",
+ "single-instance",
  "swayipc",
 ]
 
@@ -207,3 +217,31 @@ name = "unicode-xid"
 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564"
+
+[[package]]
+name = "widestring"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7157704c2e12e3d2189c507b7482c52820a16dfa4465ba91add92f266667cadb"
+
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
diff --git a/Cargo.toml b/Cargo.toml
index ed67faf..332af53 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -7,13 +7,8 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-serde = { version = "1.0", features = ["derive"] }
-serde_json = "1.0"
-failure = "0.1"
 swayipc = {version = "2.7.0", features = [ "event_stream"]}
-
-#[dependencies.swayipc]
-#features = ["async", "event_stream"]
+single-instance = "0.1.2"
 
 [packaging]
 depends = ["sway"]
diff --git a/src/main.rs b/src/main.rs
index 7b24dbb..0cd4836 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -16,6 +16,11 @@ fn get_input_id(c: &mut Connection) -> Vec<String> {
 }
 
 fn main() -> Fallible<()> {
+    let instance_a = single_instance::SingleInstance::new("whatever").unwrap();
+    if !instance_a.is_single() {
+        println!("only one instance of swkb at a time is allowed");
+        std::process::exit(1);
+    }
     let mut connection = Connection::new()?;
     let inputs = get_input_id(&mut connection);
     let mut layouts: HashMap<i64, i64> = HashMap::new();