prefix-builder.sh

#!/usr/bin/env bash
#
# Use
#  eval $(prefix-builder.sh [add|rm|prepend|append] folder)
#
# or Alias such as:
#  function eval_cmd() { eval $($*); }
#  alias build-prefix="eval_cmd prefix-builder.sh"
#  alias add-build-prefix="eval_cmd prefix-builder.sh add"
#  alias rm-build-prefix="eval_cmd prefix-builder.sh rm"
#
# To get these commands:
#  build-prefix [add|rm|prepend|append] folder
#  add-build-prefix folder
#  rm-build-prefix folder
#

if [ "$1" != "add" ] && [ "$1" != "rm" ] && [ "$1" != "prepend" ] && [ "$1" != "append" ]; then
  echo "echo You should either use 'prepend', 'append', 'add' or 'rm' operator";
  exit 1;
fi

if [ -z "$2" ]; then
  echo "echo You should provide a valid prefix";
  exit 1;
elif [ ! -d "$2" ]; then
  echo "echo $2 is not a valid folder"
  exit 1;
fi

function strip_prefix()
{
  local env=$1
  local prefix=$2
  local IFS=':'
  read -a array <<< "$env";

  for i in "${!array[@]}"; do
    if [[ "${array[i]}" == "$prefix"* ]]; then
      unset array[i];
    fi
  done

  echo "${array[*]}"
}

function write_new_path()
{
  local old_path="$1"
  local new_path="$2"

  # echo stripping $new_path from $old_path

  # # if [ *"$old_path"* == "$new_path" ]; then
  # if (echo "$old_path" | grep -Fq "$new_path"); then
  #   old_path=$(strip_prefix "$old_path", "$new_path")
  # fi

  local IFS=':'
  read -a paths <<< "$old_path";

  # for i in "${!paths[@]}"; do
  #   if [[ "${paths[i]}" == "$new_path"* ]]; then
  #     echo "Already known, removing" ${paths[i]}
  #     unset paths[i];
  #   fi
  # done

  if [ $action == "append" ]; then
    paths+=("$new_path")
  else # add | prepend
    paths=("$new_path" ${paths[@]})
  fi

  echo "${paths[*]}"
}

action=$1
PREFIX=$(readlink -f $2)
PREFIX=${PREFIX%/}
arch_path=$(dpkg-architecture -qDEB_HOST_GNU_TYPE)

if [ "$action" != "rm" ]; then
  echo export PATH=$(write_new_path "$PATH" "$PREFIX/sbin:$PREFIX/bin")
  echo export CPATH=$(write_new_path "$CPATH" "$PREFIX/include")
  # echo export MANPATH=$(write_new_path "$MANPATH" "$PREFIX/share/man")
  # echo export INFOPATH=$(write_new_path "$INFOPATH" "$PREFIX/share/info")
  echo export LIBRARY_PATH=$(write_new_path "$LIBRARY_PATH" "$PREFIX/lib")
  echo export LD_LIBRARY_PATH=$(write_new_path "$LD_LIBRARY_PATH" "$PREFIX/lib/$arch_path:$PREFIX/lib")
  echo export LD_RUN_PATH=$(write_new_path "$LD_RUN_PATH" "$PREFIX/lib")
  echo export XDG_DATA_DIRS=$(write_new_path "$XDG_DATA_DIRS" "$PREFIX/share")
  echo export XDG_CONFIG_DIRS=$(write_new_path "$XDG_CONFIG_DIRS" "$PREFIX/etc/xdg")
  echo export PKG_CONFIG_PATH=$(write_new_path "$PKG_CONFIG_PATH" "$PREFIX/lib/pkgconfig:$PREFIX/lib/$arch_path/pkgconfig:$PREFIX/share/pkgconfig")
  echo export PYTHONPATH=$(write_new_path "$PYTHONPATH" "$PREFIX/lib/python2.7/site-packages:$PREFIX/lib/python3.5/site-packages:$PREFIX/lib/python3.4/site-packages")
  echo export QML2_IMPORT_PATH=$(write_new_path "$QML2_IMPORT_PATH" "$PREFIX/lib/$arch_path/qt5/qml:$PREFIX/lib/qt5/qml")
  echo export GI_TYPELIB_PATH=$(write_new_path "$GI_TYPELIB_PATH" "$PREFIX/lib/girepository-1.0")
  #ACLOCAL_FLAGS='-I /opt/dev/COMPIZ/share/aclocal'; export ACLOCAL_FLAGS
elif [ "$action" == "rm" ]; then
  echo export PATH=$(strip_prefix "$PATH" "$PREFIX")
  echo export CPATH=$(strip_prefix "$CPATH" "$PREFIX")
  # echo export MANPATH=$(strip_prefix "$MANPATH" "$PREFIX")
  # echo export INFOPATH=$(strip_prefix "$INFOPATH" "$PREFIX")
  echo export LIBRARY_PATH=$(strip_prefix "$LIBRARY_PATH" "$PREFIX")
  echo export LD_LIBRARY_PATH=$(strip_prefix "$LD_LIBRARY_PATH" "$PREFIX")
  echo export LD_RUN_PATH=$(strip_prefix "$LD_RUN_PATH" "$PREFIX")
  echo export XDG_DATA_DIRS=$(strip_prefix "$XDG_DATA_DIRS" "$PREFIX")
  echo export XDG_CONFIG_DIRS=$(strip_prefix "$XDG_CONFIG_DIRS" "$PREFIX")
  echo export PKG_CONFIG_PATH=$(strip_prefix "$PKG_CONFIG_PATH" "$PREFIX")
  echo export PYTHONPATH=$(strip_prefix "$PYTHONPATH" "$PREFIX")
  echo export QML2_IMPORT_PATH=$(strip_prefix "$QML2_IMPORT_PATH" "$PREFIX")
  echo export GI_TYPELIB_PATH=$(strip_prefix "$GI_TYPELIB_PATH" "$PREFIX")
fi