consolidated script documentation into a single md file

wrote documentation on terminal sound effects

added a sound effect for `invoke`

added the function `build-drv`, which is a wrapper for nix-build that
puts the output nix store path to the derivation into an environment
variable instead of symlinking it in the current working directory

overlay/overlay.nix

@@ -9,7 +9,7 @@
   myScripts = {
     # Scripts written using pkgs.writeShellApplication
     icanhazip = super.callPackage ./scripts/commands/icanhazip.nix { pkgs = super; };
-    invoke = super.callPackage ./scripts/commands/invoke.nix { pkgs = super; };
+    invoke = super.callPackage ./scripts/commands/invoke.nix { pkgs = super; self = root; };
     runbg = super.callPackage ./scripts/commands/runbg.nix { pkgs = super; };
     splash = super.callPackage ./scripts/commands/splash.nix { pkgs = super; };
     toolbelt = super.callPackage ./scripts/commands/toolbelt.nix { pkgs = super; };

overlay/scripts/commands/invoke.nix

@@ -1,9 +1,10 @@
-{ pkgs }:
+{ pkgs, self }:
 pkgs.writeShellApplication {
   name = "invoke";
   text = ''
     cmd="$1"
     shift
+    playshellsound ${self}/assets/sound/invoke.wav
     nix run nixpkgs#"$cmd" -- "$@"
   '';
 }

overlay/scripts/wm-controls/s_check.nix

@@ -4,6 +4,6 @@ pkgs.writeShellApplication {
   text = ''
     #!/run/current-system/sw/bin/bash
 
-    [ "$SOUNDS_ENABLED" -eq 1 ]
+    [ "$SOUNDS_ENABLED" = "true" ]
   '';
 }