imv: add module (#4032)

* imv: add module

Signed-off-by: Christoph Heiss <christoph@c8h4.io>

* imv: add test cases

Signed-off-by: Christoph Heiss <christoph@c8h4.io>

---------

Signed-off-by: Christoph Heiss <christoph@c8h4.io>
Co-authored-by: Naïm Favier <n@monade.li>

modules/programs/imv.nix

@@ -0,0 +1,49 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.programs.imv;
+
+  toConfig = attrs:
+    ''
+      # Generated by Home Manager.
+    '' + generators.toINI { } attrs;
+in {
+  meta.maintainers = [ maintainers.christoph-heiss ];
+
+  options.programs.imv = {
+    enable = mkEnableOption
+      "imv: a command line image viewer intended for use with tiling window managers";
+
+    package = mkPackageOption pkgs "imv" { };
+
+    settings = mkOption {
+      default = { };
+      type = with types; attrsOf (attrsOf (oneOf [ bool int str ]));
+      description = ''
+        Configuration options for imv. See
+        <citerefentry>
+          <refentrytitle>imv</refentrytitle>
+          <manvolnum>5</manvolnum>
+        </citerefentry>.
+      '';
+      example = literalExpression ''
+        {
+          options.background = "ffffff";
+          aliases.x = "close";
+        }
+      '';
+    };
+  };
+
+  config = mkIf cfg.enable {
+    assertions =
+      [ (hm.assertions.assertPlatform "programs.imv" pkgs platforms.linux) ];
+
+    home.packages = [ cfg.package ];
+
+    xdg.configFile =
+      mkIf (cfg.settings != { }) { "imv/config".text = toConfig cfg.settings; };
+  };
+}