A directory-category for terminal emulators

This is a mostly cosmetical commit, in the sense it doesn't change the contents
of any package, but reorganizes the overall Nixpkgs expressions.

Terminal emulators are an ubiquitous tool for any Unix user; even the beginners
are routinely familiarized to it. And, manifestly, there are many
implementations of terminal emulators out there, from those traditionally made
in C and C++ to those written in Haskell and Go.

Terminal emulators deserve more highlight. This commit does that by creating a
category for them.

pkgs/applications/terminal-emulators/foot/default.nix

@@ -0,0 +1,38 @@
+{ stdenv, fetchgit
+, fcft, freetype, pixman, libxkbcommon, fontconfig, wayland
+, meson, ninja, ncurses, scdoc, tllist, wayland-protocols, pkg-config
+}:
+
+stdenv.mkDerivation rec {
+  pname = "foot";
+  version = "1.5.1";
+
+  src = fetchgit {
+    url = "https://codeberg.org/dnkl/foot.git";
+    rev = version;
+    sha256 = "sha256-GAk2qkrgCNILJOeRcn1NT4t3w+R6WFTZ1goOhBEwKwc=";
+  };
+
+  nativeBuildInputs = [
+    meson ninja ncurses scdoc tllist wayland-protocols pkg-config
+  ];
+  buildInputs = [
+    fontconfig freetype pixman wayland libxkbcommon fcft
+  ];
+
+  # recommended build flags for foot as per INSTALL.md
+  # https://codeberg.org/dnkl/foot/src/branch/master/INSTALL.md#user-content-release-build
+  preConfigure = ''
+    export CFLAGS+="-O3 -fno-plt"
+  '';
+
+  mesonFlags = [ "--buildtype=release" "-Db_lto=true" ];
+
+  meta = with stdenv.lib; {
+    homepage = "https://codeberg.org/dnkl/foot/";
+    description = "A fast, lightweight and minimalistic Wayland terminal emulator";
+    license = licenses.mit;
+    maintainers = [ maintainers.sternenseemann ];
+    platforms = platforms.linux;
+  };
+}