xsession: remove xsession.windowManager option

This removes the deprecated use of `xsession.windowManager` as a
string.

This commit also adjusts the xmonad module to become a full module.
I.e., the backwards compatibility hack was removed.

modules/default.nix

@@ -57,6 +57,7 @@ let
     ./services/taffybar.nix
     ./services/tahoe-lafs.nix
     ./services/udiskie.nix
+    ./services/window-managers/xmonad.nix
     ./services/xscreensaver.nix
     ./systemd.nix
     ./xresources.nix

modules/misc/news.nix

@@ -240,22 +240,6 @@ in
         '';
       }
 
-      {
-        time = "2017-09-28T21:39:45+00:00";
-        condition =
-          config.xsession.enable
-          && config.xsession.windowManager.usesDeprecated;
-        message = ''
-          The 'xsession.windowManager' option is now deprecated,
-          please use 'xsession.windowManager.command' instead.
-
-          This change was made to prepare for window manager modules
-          under the 'xsession.windowManager' namespace. For example,
-          'xsession.windowManager.xmonad' and
-          'xsession.windowManager.i3'.
-        '';
-      }
-
       {
         time = "2017-09-30T09:44:18+00:00";
         condition = with config.programs.vim;
@@ -339,19 +323,6 @@ in
         '';
       }
 
-      {
-        time = "2017-10-19T09:33:10+00:00";
-        condition =
-          config.xsession.enable
-          && config.xsession.windowManager.usesDeprecated;
-        message = ''
-          The 'xsession.windowManager' option is deprecated and will
-          be removed on October 31, 2017. To avoid evaluation errors
-          you must change to using 'xsession.windowManager.command'
-          before that date.
-        '';
-      }
-
       {
         time = "2017-10-20T12:15:27+00:00";
         condition = with config.systemd.user;

modules/services/window-managers/xmonad.nix

@@ -1,10 +1,11 @@
-{ pkgs }: { config, lib, ... }:
+{ config, lib, pkgs, ... }:
 
 with lib;
+with import ../../lib/dag.nix { inherit lib; };
 
 let
 
-  cfg = config.xmonad;
+  cfg = config.xsession.windowManager.xmonad;
 
   xmonad = pkgs.xmonad-with-packages.override {
     ghcWithPackages = cfg.haskellPackages.ghcWithPackages;
@@ -19,7 +20,7 @@ in
 
 {
   options = {
-    xmonad = {
+    xsession.windowManager.xmonad = {
       enable = mkEnableOption "xmonad window manager";
 
       haskellPackages = mkOption {
@@ -80,7 +81,32 @@ in
     };
   };
 
-  config = mkIf cfg.enable {
+  config = mkIf cfg.enable (mkMerge [
-    command = "${xmonad}/bin/xmonad";
+    {
-  };
+      xsession.windowManager.command = "${xmonad}/bin/xmonad";
+    }
+
+    (mkIf (cfg.config != null) {
+      home.file.".xmonad/xmonad.hs".source = cfg.config;
+
+      home.activation.checkXmonad = dagEntryBefore [ "linkGeneration" ] ''
+        if ! cmp --quiet "${cfg.config}" "$HOME/.xmonad/xmonad.hs"; then
+          xmonadChanged=1
+        fi
+      '';
+
+      home.activation.applyXmonad = dagEntryAfter [ "linkGeneration" ] ''
+        if [[ -v xmonadChanged ]]; then
+          echo "Recompiling xmonad"
+          ${config.xsession.windowManager.command} --recompile
+
+          # Attempt to restart xmonad if X is running.
+          if [[ -v DISPLAY ]] ; then
+            echo "Restarting xmonad"
+            ${config.xsession.windowManager.command} --restart
+          fi
+        fi
+      '';
+    })
+  ]);
 }

modules/xsession.nix

@@ -1,16 +1,21 @@
 { config, lib, pkgs, ... }:
 
 with lib;
-with import ./lib/dag.nix { inherit lib; };
 
 let
 
   cfg = config.xsession;
 
-  # Hack to support xsession.windowManager.command option.
+in
-  wmBaseModule = {
+
+{
+  meta.maintainers = [ maintainers.rycee ];
+
   options = {
-      command = mkOption {
+    xsession = {
+      enable = mkEnableOption "X Session";
+
+      windowManager.command = mkOption {
         type = types.str;
         example = literalExample ''
           let
@@ -25,39 +30,6 @@ let
         '';
       };
 
-      usesDeprecated = mkOption {
-        internal = true;
-        type = types.bool;
-        default = false;
-      };
-    };
-  };
-
-  xmonadModule = import ./services/window-managers/xmonad.nix {
-    inherit pkgs;
-  };
-
-in
-
-{
-  meta.maintainers = [ maintainers.rycee ];
-
-  options = {
-    xsession = {
-      enable = mkEnableOption "X Session";
-
-      windowManager = mkOption {
-        type =
-          types.coercedTo
-            types.str
-            (command: { inherit command; usesDeprecated = true; })
-            (types.submodule [ wmBaseModule xmonadModule ]);
-        description = ''
-          Window manager start command. DEPRECATED: Use
-          <varname>xsession.windowManager.command</varname> instead.
-        '';
-      };
-
       profileExtra = mkOption {
         type = types.lines;
         default = "";
@@ -72,43 +44,7 @@ in
     };
   };
 
-  config = mkIf cfg.enable (mkMerge [
+  config = mkIf cfg.enable {
-    (mkIf cfg.windowManager.usesDeprecated {
-      warnings = [
-        ("xsession.windowManager is deprecated, "
-          + "please use xsession.windowManager.command")
-      ];
-    })
-
-    # Hack to support xsession.windowManager as a string. Once that is
-    # removed this code should go back into the xmonad.nix file.
-    (mkIf (cfg.windowManager.xmonad.enable
-        && cfg.windowManager.xmonad.config != null) {
-      home.file.".xmonad/xmonad.hs".source = cfg.windowManager.xmonad.config;
-
-      home.activation.checkXmonad = dagEntryBefore [ "linkGeneration" ] ''
-        if ! cmp --quiet \
-            "${cfg.windowManager.xmonad.config}" \
-            "$HOME/.xmonad/xmonad.hs"; then
-          xmonadChanged=1
-        fi
-      '';
-
-      home.activation.applyXmonad = dagEntryAfter [ "linkGeneration" ] ''
-        if [[ -v xmonadChanged ]]; then
-          echo "Recompiling xmonad"
-          ${cfg.windowManager.command} --recompile
-
-          # Attempt to restart xmonad if X is running.
-          if [[ -v DISPLAY ]] ; then
-            echo "Restarting xmonad"
-            ${cfg.windowManager.command} --restart
-          fi
-        fi
-      '';
-    })
-
-    {
     systemd.user.services.setxkbmap = {
       Unit = {
         Description = "Set up keyboard in X";
@@ -191,6 +127,5 @@ in
         done
       '';
     };
-    }
+  };
-  ]);
 }