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116 lines
2.8 KiB
116 lines
2.8 KiB
##
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# \file
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# To each interface a set of caller functions exist, that take an instance
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# of an object and then in turn call the implementation for the class of
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# this object. If there is none within the class it looks into its
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# parent class and so forth.
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#
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# This is somewhat similar to late binding in real OOP languages, but
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# by far not so elaborated. This is not a real object oriented language
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# and will surely never ever provide all features these have.
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#
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# That said it has proven very usefull for me to orgnize code and prevent
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# code duplication.
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#
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# \author Georg Hopp
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#
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# \copyright
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# Copyright © 2014 Georg Hopp
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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##
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# some functions for file handling...this includes a kind of
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# include_once for shell scripts. This one also includes the
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# utils/program.sh file as it is needed in all scripts.
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#
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command -v filename2symbol >/dev/null
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if [ $? -ne 0 ]
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then
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filename2symbol() {
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local SYM="${1}"
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if [ 1 -ne $# ]
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then
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${LOGGER} -p syslog.err 'filename2sybol: missing filename'
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exit 1
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fi
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while [ "${SYM}" != "${SYM%/*}" -o "${SYM}" != "${SYM%.*}" ]
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do
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if [ "${SYM}" != "${SYM%.*}" ]
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then
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SYM="${SYM%%.*}_${SYM#*.}"
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else
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SYM="${SYM%%/*}_${SYM#*/}"
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fi
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done
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echo "${SYM}"
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}
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##
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# create an absolute filename from a given relative one.
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# This deals only with leading ./ and ../ it does not
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# handle then when they are in the middle of the name.
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#
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abs_filename() {
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local FILE="${1}"
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local DIR="${PWD}"
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# if FILE starts with a / its already absolute
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if [ "${FILE}" != ${FILE#/} ]
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then
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echo "${FILE}"
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return 0
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fi
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# simply remove ./ and make a ../ remove a part from pwd
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while [ "${FILE}" != ${FILE#./} -o "${FILE}" != ${FILE#../} ]
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do
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if [ "${FILE}" != ${FILE#./} ]
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then
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FILE="${FILE#./}"
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else
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FILE="${FILE#../}"
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DIR="${DIR%/*}"
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fi
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done
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echo "${DIR}/${FILE}"
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}
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include_once() {
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local FILE="$(abs_filename "${1}")"
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local SYM="$(filename2symbol "${FILE}")"
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if [ 1 -ne $# ]
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then
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${LOGGER} -p syslog.err 'include_once: missing filename'
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exit 1
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fi
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if eval [ -z \"\${SOURCED_${SYM}}\" ]
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then
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eval export SOURCED_${SYM}=\"\${FILE}\"
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. ${FILE}
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fi
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}
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include_once utils/programs.sh
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fi
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# vim: set ts=4 sw=4:
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