foot: add module

Foot is a fast terminal emulator for Wayland. It can optionally be run
in a client-server configuration.

There are three unit tests to handle an empty configuration, the
default configuration, and systemd service file generation.

tests/modules/programs/foot/default.nix

@@ -0,0 +1,5 @@
+{
+  foot-example-settings = ./example-settings.nix;
+  foot-empty-settings = ./empty-settings.nix;
+  foot-systemd-user-service = ./systemd-user-service.nix;
+}

tests/modules/programs/foot/empty-settings.nix

@@ -0,0 +1,16 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+{
+  config = {
+    programs.foot.enable = true;
+
+    nixpkgs.overlays =
+      [ (self: super: { foot = pkgs.writeScriptBin "dummy-foot" ""; }) ];
+
+    nmt.script = ''
+      assertPathNotExists home-files/.config/foot
+    '';
+  };
+}

tests/modules/programs/foot/example-settings-expected.ini

@@ -0,0 +1,7 @@
+[main]
+dpi-aware=yes
+font=Fira Code:size=11
+term=xterm-256color
+
+[mouse]
+hide-when-typing=yes

tests/modules/programs/foot/example-settings.nix

@@ -0,0 +1,29 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+{
+  config = {
+    programs.foot = {
+      enable = true;
+      package = pkgs.writeShellScriptBin "dummy-foot" "";
+
+      settings = {
+        main = {
+          term = "xterm-256color";
+
+          font = "Fira Code:size=11";
+          dpi-aware = "yes";
+        };
+
+        mouse = { hide-when-typing = "yes"; };
+      };
+    };
+
+    nmt.script = ''
+      assertFileContent \
+        home-files/.config/foot/foot.ini \
+        ${./example-settings-expected.ini}
+    '';
+  };
+}

tests/modules/programs/foot/systemd-user-service-expected.service

@@ -0,0 +1,12 @@
+[Install]
+WantedBy=graphical-session.target
+
+[Service]
+ExecStart=@foot@/bin/foot --server
+Restart=on-failure
+
+[Unit]
+After=graphical-session.target
+Description=Fast, lightweight and minimalistic Wayland terminal emulator.
+Documentation=man:foot(1)
+PartOf=graphical-session.target

tests/modules/programs/foot/systemd-user-service.nix

@@ -0,0 +1,21 @@
+{ config, lib, pkgs, ... }:
+
+let
+  package = pkgs.writeShellScriptBin "dummy-foot" "" // { outPath = "@foot@"; };
+in {
+  config = {
+    programs.foot = {
+      inherit package;
+      enable = true;
+      server.enable = true;
+    };
+
+    nmt.script = ''
+      assertPathNotExists home-files/.config/foot/foot.ini
+
+      assertFileContent \
+        home-files/.config/systemd/user/foot.service \
+        ${./systemd-user-service-expected.service}
+    '';
+  };
+}