modules/sway: rewrite status_command in C++

The execline version was nice, but I think execline is not really
suitable for fairly complicated scripts that run once a second.  I
frequently saw it as one of the most active processes on the system,
and it was probably really bad for power consumption!

Before rewriting in C++, I tried C, but the string handling was
extremely annoying, and Rust, but it can't do time stuff in the
standard library.  I didn't want to have to pull in a library just for
this, so C++ it was.

My first C++ program, in fact!

1 files changed, 3 insertions, 5 deletions

diff --git a/modules/workstation/windowing/sway/default.nix b/modules/workstation/windowing/sway/default.nix
index 665763f94615..5901639d1baa 100644
--- a/modules/workstation/windowing/sway/default.nix
+++ b/modules/workstation/windowing/sway/default.nix
@@ -29,11 +29,9 @@
       inherit (cfg) extraConfig;
     };
 
-    status_command = pkgs.substituteAll {
-      src = ./status_command.in;
-      isExecutable = true;
-      inherit (pkgs) execline;
-    };
+    status_command = pkgs.runCommandCC "status" {} ''
+      c++ -std=c++17 -o $out ${./status.cpp}
+    '';
 
     choose_workspace = pkgs.substituteAll {
       src = ./choose_workspace.sh.in;