patch prefered terminal into glib/gio apps like firefox

now i can type mailto:foo@bar.com into firefox urlbar and it opens in aerc in a new terminal

hosts/common/programs/assorted.nix

@@ -150,6 +150,7 @@ let
       # tageditor  # music tagging
       unar
       wireguard-tools
+      xdg-terminal-exec
       xdg-utils  # for xdg-open
       # yarn
       zsh

pkgs/additional/xdg-terminal-exec/default.nix

@@ -0,0 +1,2 @@
+{ writeShellScriptBin }:
+writeShellScriptBin "xdg-terminal-exec" (builtins.readFile ./xdg-terminal-exec)

pkgs/additional/xdg-terminal-exec/xdg-terminal-exec

@@ -0,0 +1,39 @@
+#!/bin/sh
+# xdg-terminal-exec is a proposed XDG extension, with example implementation:
+# - <https://github.com/Vladimir-csp/xdg-terminal-exec>
+#
+# its purpose is to allow any program which needs to launch a terminal to do so
+# in a manner which respects user preferences.
+# it aims to be `xdg-open`, but for opening a terminal.
+#
+# a notable user is glib/gio: <repo:gnome/glib:gio/gdesktopappinfo.c>
+# and by extension, Firefox
+#
+# it's not actually packaged for NixOS, nor Alpine, as of 2023/06/29.
+# this script is just a hackier version. it lets me insert my preferences
+
+termargs="$@"
+
+try_term() {
+  if command -v "$1" > /dev/null
+  then
+    exec "$1" $termargs
+  fi
+}
+
+# user preference
+if [ -n "$TERMINAL" ]
+then
+  exec "$TERMINAL" $termargs
+fi
+
+# hardcoded checks, imprecise order
+try_term kitty
+try_term alacritty
+try_term foot
+try_term st
+try_term gnome-terminal
+try_term konsole
+
+# fallback to default
+exec xterm "$termargs"

pkgs/default.nix

@@ -47,6 +47,7 @@ let
     sxmo-utils = callPackage ./additional/sxmo-utils { };
     tow-boot-pinephone = callPackage ./additional/tow-boot-pinephone { };
     unftp = callPackage ./additional/unftp { };
+    xdg-terminal-exec = callPackage ./additional/xdg-terminal-exec { };
     zecwallet-light-cli = callPackage ./additional/zecwallet-light-cli { };
 
     # packages i haven't used for a while, may or may not still work