From bf9b9026d9b8b060332b19f7d120da1ae6a3380f Mon Sep 17 00:00:00 2001
From: Silvan Mosberger <infinisil@icloud.com>
Date: Fri, 22 Sep 2017 22:42:37 +0200
Subject: [PATCH] compton: extend module

---
 modules/services/compton.nix | 206 ++++++++++++++++++++++++++++++++++-
 1 file changed, 200 insertions(+), 6 deletions(-)

diff --git a/modules/services/compton.nix b/modules/services/compton.nix
index e1c34997..f425db8a 100644
--- a/modules/services/compton.nix
+++ b/modules/services/compton.nix
@@ -1,15 +1,207 @@
 { config, lib, pkgs, ... }:
 
 with lib;
+with builtins;
 
-{
-  options = {
-    services.compton = {
-      enable = mkEnableOption "Compton X11 compositor";
+let
+
+  cfg = config.services.compton;
+
+  configFile = pkgs.writeText "compton.conf"
+    (optionalString cfg.fade ''
+      # fading
+      fading = true;
+      fade-delta    = ${toString cfg.fadeDelta};
+      fade-in-step  = ${elemAt cfg.fadeSteps 0};
+      fade-out-step = ${elemAt cfg.fadeSteps 1};
+      fade-exclude  = ${toJSON cfg.fadeExclude};
+    '' +
+    optionalString cfg.shadow ''
+
+      # shadows
+      shadow = true;
+      shadow-offset-x = ${toString (elemAt cfg.shadowOffsets 0)};
+      shadow-offset-y = ${toString (elemAt cfg.shadowOffsets 1)};
+      shadow-opacity  = ${cfg.shadowOpacity};
+      shadow-exclude  = ${toJSON cfg.shadowExclude};
+    '' + ''
+      # opacity
+      active-opacity   = ${cfg.activeOpacity};
+      inactive-opacity = ${cfg.inactiveOpacity};
+      menu-opacity     = ${cfg.menuOpacity};
+
+      # other options
+      backend = ${toJSON cfg.backend};
+      vsync = ${toJSON cfg.vSync};
+      refresh-rate = ${toString cfg.refreshRate};
+    '' + cfg.extraOptions);
+
+in {
+
+  options.services.compton = {
+    enable = mkEnableOption "Compton X11 compositor";
+
+    fade = mkOption {
+      type = types.bool;
+      default = false;
+      description = ''
+        Fade windows in and out.
+      '';
+    };
+
+    fadeDelta = mkOption {
+      type = types.int;
+      default = 10;
+      example = 5;
+      description = ''
+        Time between fade animation step (in ms).
+      '';
+    };
+
+    fadeSteps = mkOption {
+      type = types.listOf types.str;
+      default = [ "0.028" "0.03" ];
+      example = [ "0.04" "0.04" ];
+      description = ''
+        Opacity change between fade steps (in and out).
+      '';
+    };
+
+    fadeExclude = mkOption {
+      type = types.listOf types.str;
+      default = [];
+      example = [
+        "window_type *= 'menu'"
+        "name ~= 'Firefox$'"
+        "focused = 1"
+      ];
+      description = ''
+        List of conditions of windows that should not be faded.
+        See <literal>compton(1)</literal> man page for more examples.
+      '';
+    };
+
+    shadow = mkOption {
+      type = types.bool;
+      default = false;
+      description = ''
+        Draw window shadows.
+      '';
+    };
+
+    shadowOffsets = mkOption {
+      type = types.listOf types.int;
+      default = [ (-15) (-15) ];
+      example = [ (-10) (-15) ];
+      description = ''
+        Left and right offset for shadows (in pixels).
+      '';
+    };
+
+    shadowOpacity = mkOption {
+      type = types.str;
+      default = "0.75";
+      example = "0.8";
+      description = ''
+        Window shadows opacity (number in range 0 - 1).
+      '';
+    };
+
+    shadowExclude = mkOption {
+      type = types.listOf types.str;
+      default = [];
+      example = [
+        "window_type *= 'menu'"
+        "name ~= 'Firefox$'"
+        "focused = 1"
+      ];
+      description = ''
+        List of conditions of windows that should have no shadow.
+        See <literal>compton(1)</literal> man page for more examples.
+      '';
+    };
+
+    activeOpacity = mkOption {
+      type = types.str;
+      default = "1.0";
+      example = "0.8";
+      description = ''
+        Opacity of active windows.
+      '';
+    };
+
+    inactiveOpacity = mkOption {
+      type = types.str;
+      default = "1.0";
+      example = "0.8";
+      description = ''
+        Opacity of inactive windows.
+      '';
+    };
+
+    menuOpacity = mkOption {
+      type = types.str;
+      default = "1.0";
+      example = "0.8";
+      description = ''
+        Opacity of dropdown and popup menu.
+      '';
+    };
+
+    backend = mkOption {
+      type = types.str;
+      default = "glx";
+      description = ''
+        Backend to use: <literal>glx</literal> or <literal>xrender</literal>.
+      '';
+    };
+
+    vSync = mkOption {
+     type = types.str;
+     default = "none";
+     example = "opengl-swc";
+     description = ''
+       Enable vertical synchronization using the specified method.
+       See <literal>compton(1)</literal> man page available methods.
+     '';
+    };
+
+    refreshRate = mkOption {
+      type = types.int;
+      default = 0;
+      example = 60;
+      description = ''
+       Screen refresh rate (0 = automatically detect).
+      '';
+    };
+
+    package = mkOption {
+      type = types.package;
+      default = pkgs.compton;
+      defaultText = "pkgs.compton";
+      example = literalExample "pkgs.compton";
+      description = ''
+        Compton derivation to use.
+      '';
+    };
+
+    extraOptions = mkOption {
+      type = types.str;
+      default = "";
+      example = ''
+        unredir-if-possible = true;
+        dbe = true;
+      '';
+      description = ''
+        Additional Compton configuration.
+      '';
     };
   };
 
-  config = mkIf config.services.compton.enable {
+  config = mkIf cfg.enable {
+
+    home.packages = [ cfg.package ];
+
     systemd.user.services.compton = {
         Unit = {
           Description = "Compton X11 compositor";
@@ -22,7 +214,9 @@ with lib;
         };
 
         Service = {
-          ExecStart = "${pkgs.compton}/bin/compton";
+          ExecStart = "${cfg.package}/bin/compton --config ${configFile}";
+          Restart = "always";
+          RestartSec = 3;
         };
     };
   };