feat(fonts): patch IBM Plex for compliant font weight names

modules/nix.nix

@@ -27,6 +27,7 @@
       inputs.discord-applemusic-rich-presence.overlays.default
       inputs.nyoom.overlays.default
       (import ../overlays/ryan-mono-bin.nix)
+      (import ../overlays/ibm-plex.nix)
     ];
 
     config.allowUnfree = true;

overlays/ibm-plex.nix

@@ -0,0 +1,41 @@
+(_: prev: {
+  ibm-plex = prev.ibm-plex.overrideAttrs (prev': {
+    postInstall = ''
+      set -eo pipefail
+      PATH="${prev.fd}/bin:${prev.python311Packages.fonttools}/bin:$PATH"
+
+      cd "$out/share/fonts/opentype"
+
+      ansi_dim="\033[2m"
+      ansi_blue="\033[34m"
+      ansi_green="\033[32m"
+      ansi_reset="\033[0m"
+
+      medium_fonts=$(fd --extension=otf Medium)
+
+      for medium_font in $medium_fonts; do
+        echo -e "''${ansi_blue}Patching''${ansi_reset} $medium_font (Medm -> Medium)"
+
+        ttx_path="''${medium_font%.*}.ttx"
+
+        ttx "$medium_font"
+        sed -i 's/Medm/Medium/g' "$ttx_path"
+        ttx -f "$ttx_path"
+      done
+
+      semibold_fonts=$(fd --extension=otf SemiBold)
+
+      for semibold_font in $semibold_fonts; do
+        echo -e "''${ansi_blue}Patching''${ansi_reset} $semibold_font (SmBld -> Semibold)"
+
+        ttx_path="''${semibold_font%.*}.ttx"
+
+        ttx "$semibold_font"
+        sed -i 's/SmBld/Semibold/g' "$ttx_path"
+        ttx -f "$ttx_path"
+      done
+
+      echo -e "''${ansi_green}Done!''${ansi_reset}"
+    '';
+  });
+})