My own left-handed patch for Bibata Cursor

See also ful1e5/Bibata_Cursor#112

user-specific/mouse-cursor/default.nix

@@ -3,12 +3,74 @@
 { pkgs, ... }:
 let
   inherit (import ../../constants.nix) wenzelUserName;
+
+  left-handed-bibata-cursors = pkgs.bibata-cursors.overrideAttrs (srcAttrs: {
+    nativeBuildInputs = srcAttrs.nativeBuildInputs ++ [
+      pkgs.findutils
+      pkgs.gnugrep
+      pkgs.perl
+      pkgs.imagemagick
+    ];
+
+    patches = [
+      ./flip-x-hot-points-for-left-handed-cursors.patch
+    ];
+
+    buildPhase = ''
+      mkdir bitmaps
+      unzip $bitmaps -d bitmaps
+      rm -rf themes
+
+      (
+        set -uo pipefail || exit
+
+        images_to_flip=$(
+          cat builder/src/constants.py \
+            | perl -nE 'if (/^horizontally_flipped/) {$x=1;next}; print if $x' \
+            | perl -nE '$x=1 if /^]/; print unless $x' \
+            | sed -e 's/#.*//' -e 's/[," ]//g' \
+            | grep -v '^$'
+        )
+
+        static_images_to_flip=$(grep '\.png$' <<< "$images_to_flip")
+        animated_images_to_flip=$(grep -v '\.png$' <<< "$images_to_flip")
+        readarray -t static_images_to_flip <<< "$static_images_to_flip"
+        readarray -t animated_images_to_flip <<< "$animated_images_to_flip"
+
+        cd bitmaps
+        themes=$(ls)
+        readarray -t themes <<< "$themes"
+
+        for theme in "''${themes[@]}"; do
+          (
+            cd -- "$theme"
+
+            >&2 printf 'Horizontally flipping static images for "%s" theme...\n' "$theme"
+            for image in "''${static_images_to_flip[@]}"; do
+              (set -x && convert -flop -- "$image" "$image")
+            done
+
+            >&2 printf 'Horizontally flipping animated frames for "%s" theme...\n' "$theme"
+            for file_prefix in "''${animated_images_to_flip[@]}"; do
+              files=$(find -name "''${file_prefix}*.png")
+              readarray -t files <<< "$files"
+              for image in "''${files[@]}"; do
+                (set -x && convert -flop -- "$image" "$image")
+              done
+            done
+          )
+        done
+      )
+
+      cd builder && make build_unix
+    '';
+  });
 in
 {
   home-manager.users.${wenzelUserName} = {
     xsession.pointerCursor = {
       name = "Bibata-Original-Ice";
-      package = pkgs.bibata-cursors;
+      package = left-handed-bibata-cursors;
       defaultCursor = "left_ptr";
       size = 24;
     };

user-specific/mouse-cursor/flip-x-hot-points-for-left-handed-cursors.patch

@@ -0,0 +1,88 @@
+diff --git a/builder/src/constants.py b/builder/src/constants.py
+index b8bd14b7..45f8cd01 100644
+--- a/builder/src/constants.py
++++ b/builder/src/constants.py
+@@ -1,7 +1,7 @@
+ #!/usr/bin/env python
+ # -*- coding: utf-8 -*-
+
+-from typing import Dict
++from typing import Dict, List
+
+ # Info
+ AUTHOR = "Kaiz Khatri"
+@@ -80,6 +80,74 @@ X_CURSORS_CFG: Dict[str, Dict[str, int]] = {
+     "wait": {"xhot": 100, "yhot": 100},
+ }
+
++horizontally_flipped: List[str] = [
++    ##########
++    # Static #
++    ##########
++    # "bottom_left_corner.png", # must stay as-is
++    # "bottom_right_corner.png", # must stay as-is
++    # "bottom_side.png", # must stay as-is
++    # "bottom_tee.png", # must stay as-is
++    "center_ptr.png",
++    "circle.png",
++    "context-menu.png",
++    "copy.png",
++    "cross.png",
++    "crossed_circle.png",
++    "crosshair.png",
++    "dnd_no_drop.png",
++    "dnd-ask.png",
++    "dnd-copy.png",
++    "dnd-link.png",
++    "dnd-move.png",
++    "dotbox.png",
++    # "fd_double_arrow.png", # must stay as-is
++    "grabbing.png",
++    "hand1.png",
++    "hand2.png",
++    "left_ptr.png",
++    # "left_side.png", # must stay as-is
++    # "left_tee.png", # must stay as-is
++    "link.png",
++    # "ll_angle.png", # must stay as-is
++    # "lr_angle.png", # must stay as-is
++    "move.png",
++    "pencil.png",
++    "plus.png",
++    "pointer-move.png",
++    # "question_arrow.png", # must stay as-is
++    "right_ptr.png",
++    # "right_side.png", # must stay as-is
++    # "right_tee.png", # must stay as-is
++    # "sb_down_arrow.png", # must stay as-is
++    # "sb_h_double_arrow.png", # must stay as-is
++    # "sb_left_arrow.png", # must stay as-is
++    # "sb_right_arrow.png", # must stay as-is
++    # "sb_up_arrow.png", # must stay as-is
++    # "sb_v_double_arrow.png", # must stay as-is
++    "tcross.png",
++    # "top_left_corner.png", # must stay as-is
++    # "top_right_corner.png", # must stay as-is
++    # "top_side.png", # must stay as-is
++    # "top_tee.png", # must stay as-is
++    # "ul_angle.png", # must stay as-is
++    # "ur_angle.png", # must stay as-is
++    "vertical-text.png",
++    # "wayland-cursor.png", # must stay as-is
++    "X_cursor.png",
++    "xterm.png",
++    "zoom-in.png",
++    "zoom-out.png",
++    ############
++    # Animated #
++    ############
++    "left_ptr_watch",
++    "wait", # makes it be counter-clockwise, the same as "left_ptr_watch"
++]
++
++for key in horizontally_flipped:
++    X_CURSORS_CFG[key]["xhot"] = 200 - X_CURSORS_CFG[key]["xhot"]
++
+ WIN_CURSORS_CFG: Dict[str, Dict[str, str]] = {
+     ##########
+     # Static #