#!/bin/sh

#
# Copy file and flatten its name by replace '/' by '_'. For more
# details see examples below.
#
# Usage:
#
#   flat_cp [from] [to_dir] [cut_from]
#   from     - source file
#   to_dir   - target file
#   cut_from - part of source file path. Only part after
#              cut_from will be used for target file name.
#
# Examples:
#   If execute the command:
#
#   $ flat cp /home/user/application/templates/controls/radio \
#       /home/user/application/compiled_templates "templates"
#
#   the file from '/home/user/application/templates/controls/radio'
#   will be copied to '/home/user/application/compiled_templates/controls_radio'
#

source_file=$1
cut_from=$(sed -r "s/\/+$//" <<< "$3")

if [ $cut_from ]
then
    cut_from=$(sed -r "s/\//\\\\\//g" <<< "$cut_from")
    target_file_name=$(sed -r "s/^(.*)$cut_from\/(.*)$/\2/" <<< "$source_file")
else
    target_file_name=$source_file
fi

target_file_name=$(sed -r "s/\//_/g" <<< "$target_file_name")
target_file=$(sed -r "s/\/?$//" <<< "$2")"/"$target_file_name

cp $source_file $target_file