# Workaround for using the Arch Linux AUR package
# `softmaker-office-2024-bin` with the LXDE desktop environment.

# The workaround is effectively usable for the following icon themes:
# `lxde-icon-theme`, `mate-icon-theme`, `papirus-icon-theme`, and
# `pop-icon-theme`.

# Save the file as "softmaker-office-2024-bin.install". To use it
# with the "softmaker-office-2024-bin" package, add the following
# lines to the PKGBUILD:

# install="${pkgname}.install"
# depends+=('gtk-update-icon-cache')

# A problem exists within the LXDE desktop environment. New icons
# for MIME types installed within the Hicolor icon theme are
# not utilized by PCManFM. PCManFM only considers icons that are
# installed in the currently selected icon theme.

# For this specific case, I propose a workaround that essentially
# follows the procedure for installing SoftMaker Office using
# the installation script `installsmoffice`. Please refer to the
# `installsmoffice` script (lines 504 et seq.) located within the
# "softmaker-office-2024-1234-amd64.tgz" archive.

# This workaround is executed via an *.INSTALL* script following
# either the installation or uninstallation process. The script
# adopts a highly conservative approach regarding any modifications
# made to the installed icon themes.

# The workaround was successfully tested with the LXDE
# desktop environment (package group `lxde`) and the packages
# `lxde-icon-theme` (nuoveXT2), `mate-icon-theme` (mate, menta),
# `papirus-icon-theme` (Papirus, - but does not work with Papirus-Dark
# and Papirus-Light), and `pop-icon-theme` (Pop). **Limitation:**
# It is not suitable for icon themes whose directory hierarchy is
# not structured similarly to the Hicolor model.

# Some of the aforementioned icon themes prioritize their own icons
# for MIME types - such as those for Microsoft Office files. However,
# this is precisely the behavior that users of an icon theme expect.

post_install() {
  ALLTHEMES=$(find /usr/share/icons/* | \
    grep 'msword\|excel\|powerpoint' | \
    grep -v 'excellent' | \
    grep -v 'hicolor' | \
    sed -r 's/^\/usr\/share\/icons\/([^/]+)\/.+/\1/' | \
    grep -v '\.' | \
    sort | \
    uniq)
# NB: It is possible to create new directories within a icon theme
# and install icons there (e.g., using the `xdg-icon-resource`
# command). It cannot be ruled out that this approach will
# yield a functional result. However, if directories are
# not listed in the index.theme file, this constitutes a
# violation - at the very least - of the "Icon Theme Specification"
# <https://specifications.freedesktop.org/icon-theme/latest/>. Only
# in the case of Hicolor we do know exactly which directories are
# available. Consequently, particular care should be exercised
# when installing icons into unknown icon themes.
  for THEME in $ALLTHEMES ; do
    if [ -f "/usr/share/icons/${THEME}/index.theme" ]; then
      for size in 16 32 48 64 128 256 512; do
        if [ -d "/usr/share/icons/${THEME}/${size}x${size}/mimetypes" ] && \
            [ ! -L "/usr/share/icons/${THEME}/${size}x${size}/mimetypes" ] && \
            grep -q -P "^Directories=.*${size}x${size}/mimetypes,*" \
              "/usr/share/icons/${THEME}/index.theme"; then
          ln -s "/usr/share/office2024/icons/pmd_${size}.png" \
            "/usr/share/icons/${THEME}/${size}x${size}/mimetypes/application-x-pmd24.png"
          ln -s "/usr/share/office2024/icons/prd_${size}.png" \
            "/usr/share/icons/${THEME}/${size}x${size}/mimetypes/application-x-prd24.png"
          ln -s "/usr/share/office2024/icons/tmd_${size}.png" \
            "/usr/share/icons/${THEME}/${size}x${size}/mimetypes/application-x-tmd24.png"
          ln -s "/usr/share/office2024/icons/pmd_oth_${size}.png" \
            "/usr/share/icons/${THEME}/${size}x${size}/mimetypes/application-x-pmd24-oth.png"
          ln -s "/usr/share/office2024/icons/tmd_oth_${size}.png" \
            "/usr/share/icons/${THEME}/${size}x${size}/mimetypes/application-x-tmd24-oth.png"
          ln -s "/usr/share/office2024/icons/pmd_mso_${size}.png" \
            "/usr/share/icons/${THEME}/${size}x${size}/mimetypes/application-x-pmd24-mso.png"
          ln -s "/usr/share/office2024/icons/prd_mso_${size}.png" \
            "/usr/share/icons/${THEME}/${size}x${size}/mimetypes/application-x-prd24-mso.png"
          ln -s "/usr/share/office2024/icons/tmd_mso_${size}.png" \
            "/usr/share/icons/${THEME}/${size}x${size}/mimetypes/application-x-tmd24-mso.png"
        fi
      done
# NB: The hook "/usr/share/libalpm/hooks/gtk-update-icon-cache.hook"
# is not triggered for the directories "/usr/share/icons/*" if
# the changes were made by the .INSTALL script. (Although `namcap`
# claims otherwise.)
      gtk-update-icon-cache -q -f "/usr/share/icons/${THEME}"
    fi
  done
}

post_remove() {
  ALLTHEMES=$(find /usr/share/icons/* | \
    grep 'msword\|excel\|powerpoint' | \
    grep -v 'excellent' | \
    grep -v 'hicolor' | \
    sed -r 's/^\/usr\/share\/icons\/([^/]+)\/.+/\1/' | \
    grep -v '\.' | \
    sort | \
    uniq)
  for THEME in $ALLTHEMES ; do
    if [ -f "/usr/share/icons/${THEME}/index.theme" ]; then
      for size in 16 32 48 64 128 256 512; do
        if [ -d "/usr/share/icons/${THEME}/${size}x${size}/mimetypes" ]; then
          rm -f "/usr/share/icons/${THEME}/${size}x${size}/mimetypes/application-x-pmd24.png"
          rm -f "/usr/share/icons/${THEME}/${size}x${size}/mimetypes/application-x-prd24.png"
          rm -f "/usr/share/icons/${THEME}/${size}x${size}/mimetypes/application-x-tmd24.png"
          rm -f "/usr/share/icons/${THEME}/${size}x${size}/mimetypes/application-x-pmd24-oth.png"
          rm -f "/usr/share/icons/${THEME}/${size}x${size}/mimetypes/application-x-tmd24-oth.png"
          rm -f "/usr/share/icons/${THEME}/${size}x${size}/mimetypes/application-x-pmd24-mso.png"
          rm -f "/usr/share/icons/${THEME}/${size}x${size}/mimetypes/application-x-prd24-mso.png"
          rm -f "/usr/share/icons/${THEME}/${size}x${size}/mimetypes/application-x-tmd24-mso.png"
        fi
      done
      gtk-update-icon-cache -q -f "/usr/share/icons/${THEME}"
    fi
  done
}