swayimg: add module (#6506)

modules/programs/swayimg.nix

@@ -0,0 +1,53 @@
+{ config, lib, pkgs, ... }:
+
+let
+  cfg = config.programs.swayimg;
+  iniFormat = pkgs.formats.ini { };
+in {
+  meta.maintainers = with lib.maintainers; [ dod-101 ];
+
+  options.programs.swayimg = {
+    enable = lib.mkEnableOption "swayimg";
+    package = lib.mkOption {
+      type = lib.types.package;
+      default = pkgs.swayimg;
+      defaultText = lib.literalExpression "pkgs.swayimg";
+      description = "The swayimg package to install";
+    };
+    settings = lib.mkOption {
+      type = iniFormat.type;
+      default = { };
+      description = ''
+        Configuration written to
+        {file}`$XDG_CONFIG_HOME/swayimg/config`. See <https://github.com/artemsen/swayimg/blob/master/extra/swayimgrc> for a list of available options.
+      '';
+      example = lib.literalExpression ''
+        {
+          viewer = {
+            window = "#10000010";
+            scale = "fill";
+          };
+          "info.viewer" = {
+            top_left = "+name,+format";
+          };
+          "keys.viewer" = {
+            "Shift+r" = "rand_file";
+          };
+        }
+      '';
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "programs.swayimg" pkgs
+        lib.platforms.linux)
+    ];
+
+    home.packages = [ cfg.package ];
+
+    xdg.configFile."swayimg/config" = lib.mkIf (cfg.settings != { }) {
+      source = iniFormat.generate "config" cfg.settings;
+    };
+  };
+}