treewide: refactor, nix, overlays -> packages

packages/ibm-plex-compat.nix

@@ -0,0 +1,46 @@
+{
+  ibm-plex,
+  fd,
+  python312Packages,
+}:
+ibm-plex.overrideAttrs (_: {
+  pname = "ibm-plex-compat";
+
+  postInstall = ''
+    set -eo pipefail
+    PATH="${fd}/bin:${python312Packages.fonttools}/bin:$PATH"
+
+    cd "$out/share/fonts/opentype"
+
+    ansi_green="\033[32m"
+    ansi_reset="\033[0m"
+
+    medium_fonts=$(fd --extension=otf Medium)
+
+    for medium_font in $medium_fonts; do
+      echo -e "''${ansi_green}Patching''${ansi_reset} $medium_font (Medm -> Medium)"
+
+      ttx_path="''${medium_font%.*}.ttx"
+
+      ttx "$medium_font"
+      substituteInPlace "$ttx_path" --replace-fail 'Medm' 'Medium'
+      ttx -f "$ttx_path"
+      rm "$ttx_path"
+    done
+
+    semibold_fonts=$(fd --extension=otf SemiBold)
+
+    for semibold_font in $semibold_fonts; do
+      echo -e "''${ansi_green}Patching''${ansi_reset} $semibold_font (SmBld -> Semibold)"
+
+      ttx_path="''${semibold_font%.*}.ttx"
+
+      ttx "$semibold_font"
+      substituteInPlace "$ttx_path" --replace-fail 'SmBld' 'Semibold'
+      ttx -f "$ttx_path"
+      rm "$ttx_path"
+    done
+
+    echo -e "''${ansi_green}Done!''${ansi_reset}"
+  '';
+})