autorandr: add module

modules/misc/news.nix

@@ -605,6 +605,13 @@ in
           can be used.
         '';
       }
+
+      {
+        time = "2018-04-19T07:42:01+00:00";
+        message = ''
+          A new module is available: 'programs.autorandr'.
+        '';
+      }
     ];
   };
 }

modules/modules.nix

@@ -22,6 +22,7 @@ let
     ./misc/nixpkgs.nix
     ./misc/pam.nix
     ./misc/xdg.nix
+    ./programs/autorandr.nix
     ./programs/bash.nix
     ./programs/beets.nix
     ./programs/browserpass.nix

modules/programs/autorandr.nix

@@ -0,0 +1,230 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  cfg = config.programs.autorandr;
+
+  profileModule = types.submodule {
+    options = {
+      fingerprint = mkOption {
+        type = types.attrsOf types.string;
+        description = ''
+          Output name to EDID mapping.
+          Use <code>autorandr --fingerprint</code> to get current setup values.
+        '';
+        default = {};
+      };
+
+      config = mkOption {
+        type = types.attrsOf configModule;
+        description = "Per output profile configuration.";
+        default = {};
+      };
+
+      hooks = mkOption {
+        type = profileHooksModule;
+        description = "Profile hook scripts.";
+        default = {};
+      };
+    };
+  };
+
+  configModule = types.submodule {
+    options = {
+      enable = mkOption {
+        type = types.bool;
+        description = "Whether to enable the output.";
+        default = true;
+      };
+
+      primary = mkOption {
+        type = types.bool;
+        description = "Whether output should be marked as primary";
+        default = false;
+      };
+
+      position = mkOption {
+        type = types.string;
+        description = "Output position";
+        default = "";
+        example = "5760x0";
+      };
+
+      mode = mkOption {
+        type = types.string;
+        description = "Output resolution.";
+        default = "";
+        example = "3840x2160";
+      };
+
+      rate = mkOption {
+        type = types.string;
+        description = "Output framerate.";
+        default = "";
+        example = "60.00";
+      };
+
+      gamma = mkOption {
+        type = types.string;
+        description = "Output gamma configuration.";
+        default = "";
+        example = "1.0:0.909:0.833";
+      };
+    };
+  };
+
+  hookType = types.lines;
+
+  globalHooksModule = types.submodule {
+    options = {
+      postswitch = mkOption {
+        type = types.attrsOf hookType;
+        description = "Postswitch hook executed after mode switch.";
+        default = {};
+      };
+
+      preswitch = mkOption {
+        type = types.attrsOf hookType;
+        description = "Preswitch hook executed before mode switch.";
+        default = {};
+      };
+
+      predetect = mkOption {
+        type = types.attrsOf hookType;
+        description = "Predetect hook executed before autorandr attempts to run xrandr.";
+        default = {};
+      };
+    };
+  };
+
+  profileHooksModule = types.submodule {
+    options = {
+      postswitch = mkOption {
+        type = hookType;
+        description = "Postswitch hook executed after mode switch.";
+        default = "";
+      };
+
+      preswitch = mkOption {
+        type = hookType;
+        description = "Preswitch hook executed before mode switch.";
+        default = "";
+      };
+
+      predetect = mkOption {
+        type = hookType;
+        description = "Predetect hook executed before autorandr attempts to run xrandr.";
+        default = "";
+      };
+    };
+  };
+
+  hookToFile = folder: name: hook:
+    nameValuePair
+      "autorandr/${folder}/${name}"
+      { source = "${pkgs.writeShellScriptBin "hook" hook}/bin/hook"; };
+  profileToFiles = name: profile: with profile; mkMerge ([
+    {
+      "autorandr/${name}/setup".text = concatStringsSep "\n" (mapAttrsToList fingerprintToString fingerprint);
+      "autorandr/${name}/config".text = concatStringsSep "\n" (mapAttrsToList configToString profile.config);
+    }
+    (mkIf (hooks.postswitch != "") (listToAttrs [ (hookToFile name "postswitch" hooks.postswitch) ]))
+    (mkIf (hooks.preswitch != "") (listToAttrs [ (hookToFile name "preswitch" hooks.preswitch) ]))
+    (mkIf (hooks.predetect != "") (listToAttrs [ (hookToFile name "predetect" hooks.predetect) ]))
+  ]);
+  fingerprintToString = name: edid: "${name} ${edid}";
+  configToString = name: config: if config.enable then ''
+    output ${name}
+    ${optionalString (config.position != "") "pos ${config.position}"}
+    ${optionalString config.primary "primary"}
+    ${optionalString (config.gamma != "") "gamma ${config.gamma}"}
+    ${optionalString (config.mode != "") "mode ${config.mode}"}
+    ${optionalString (config.rate != "") "rate ${config.rate}"}
+  '' else ''
+    output ${name}
+    off
+  '';
+
+in
+
+{
+  options = {
+    programs.autorandr = {
+      enable = mkEnableOption "Autorandr";
+
+      hooks = mkOption {
+        type = globalHooksModule;
+        description = "Global hook scripts";
+        default = {};
+        example = literalExample ''
+        {
+          postswitch = {
+            "notify-i3" = "''${pkgs.i3}/bin/i3-msg restart";
+            "change-background" = readFile ./change-background.sh;
+            "change-dpi" = '''
+              case "$AUTORANDR_CURRENT_PROFILE" in
+                default)
+                  DPI=120
+                  ;;
+                home)
+                  DPI=192
+                  ;;
+                work)
+                  DPI=144
+                  ;;
+                *)
+                  echo "Unknown profle: $AUTORANDR_CURRENT_PROFILE"
+                  exit 1
+              esac
+
+              echo "Xft.dpi: $DPI" | ''${pkgs.xorg.xrdb}/bin/xrdb -merge
+            '''
+          };
+        }
+        '';
+      };
+
+      profiles = mkOption {
+        type = types.attrsOf profileModule;
+        description = "Autorandr profiles specification.";
+        default = {};
+        example = literalExample ''
+          {
+            "work" = {
+              fingerprint = {
+                eDP1 = "<EDID>";
+                DP1 = "<EDID>";
+              };
+              config = {
+                eDP1.enable = false;
+                DP1 = {
+                  enable = true;
+                  primary = true;
+                  position = "0x0";
+                  mode = "3840x2160";
+                  gamma = "1.0:0.909:0.833";
+                  rate = "60.00";
+                };
+              };
+              hooks.postswitch = readFile ./work-postswitch.sh;
+            };
+          }
+        '';
+      };
+    };
+  };
+
+  config = mkIf cfg.enable {
+    home.packages = [ pkgs.autorandr ];
+    xdg.configFile = mkMerge ([
+      (mapAttrs' (hookToFile "postswitch.d") cfg.hooks.postswitch)
+      (mapAttrs' (hookToFile "preswitch.d")  cfg.hooks.preswitch)
+      (mapAttrs' (hookToFile "predetect.d")  cfg.hooks.predetect)
+      (mkMerge (mapAttrsToList profileToFiles cfg.profiles))
+    ]);
+  };
+
+  meta.maintainers = [ maintainers.uvnikita ];
+}