bashrc: Add utility function to clamp maximum length of file name

This is useful when synchronizing to an Rclone encrypted remote

bash/.bashrc

@@ -124,3 +124,36 @@ export QT_IM_MODULE=fcitx
 export SDL_IM_MODULE=fcitx
 export WLR_XWAYLAND=$HOME/.local/bin/Xwayland-noshm
 $MACHINE_START_SWAY && [[ -z "$DISPLAY" && $(tty) == /dev/tty1 ]] && exec sway
+
+# Miscellaneous utilities
+function clamp_filename() {
+  [[ -z "$1" ]] && return 1
+
+  local len="$1"
+
+  for file in *; do
+    local filename_len=$(echo "$file" | wc -c)
+
+    if [ $filename_len -gt $len ]; then
+      local extension="${file##*.}"
+      local filename="${filename%.*}"
+      if [ ${#extension} -gt 5 ]; then
+        filename="$file"
+        extension=""
+      fi
+      local clamped_filename="$(echo "$file" | cut -c1-$((len - ${#extension})) | iconv -f utf8 -t utf8 -c -)"
+      if [ ${#extension} -gt 0 ]; then
+        clamped_filename="$clamped_filename.$extension"
+      fi
+      echo "File '$PWD/$file' clamped to '$PWD/$clamped_filename'"
+      mv "$file" "$clamped_filename"
+      file="$clamped_filename"
+    fi
+
+    if [ -d "$file" ]; then
+      pushd "$file" > /dev/null
+      clamp_filename "$1"
+      popd > /dev/null
+    fi
+  done
+}