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For directories dirname gets tripped for ../ and returns ./.

nolan6000's function can be modified to fix that:

get_abs_filename() {
  # $1 : relative filename
  if [ -d "${1%/*}" ]; then
    echo "$(cd ${1%/*}; pwd)/${1##*/}"
  fi
}

For directories dirname gets tripped for ../ and returns ./.

nolan6000's function can be modified to fix that:

get_abs_filename() {
  # $1 : relative filename
  if [ -d "${1%/*}" ]; then
    echo "$(cd ${1%/*}; pwd)/${1##*/}"
  fi
}

for just directories dirname gets tripped for ../ 
it returns ./
nolan's function can be modified to fix that

    get_abs_filename() {
      # $1 : relative filename
      if [ -d "${1%/*}" ]; then
        echo "$(cd ${1%/*}; pwd)/${1##*/}"
      fi
    }

For directories dirname gets tripped for ../ and returns ./.

nolan6000's function can be modified to fix that:

get_abs_filename() {
  # $1 : relative filename
  if [ -d "${1%/*}" ]; then
    echo "$(cd ${1%/*}; pwd)/${1##*/}"
  fi
}

for just directories dirname gets tripped for ../ it returns ./ nolan's function can be modified to fix that

get_abs_filename() {
  # $1 : relative filename
  if [ -d "${1%/*}" ]; then
    echo "$(cd ${1%/*}; pwd)/${1##*/}"
  fi
}

for just directories dirname gets tripped for ../ 
it returns ./
nolan's function can be modified to fix that

    get_abs_filename() {
      # $1 : relative filename
      if [ -d "${1%/*}" ]; then
        echo "$(cd ${1%/*}; pwd)/${1##*/}"
      fi
    }