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#!/bin/bash
# Copyright (C) 2013 Jan Engelhardt <jengelh@inai.de>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the
# Free Software Foundation, Inc.,
# 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
# from http://mywiki.wooledge.org/BashFAQ/021
# The ${a/b/c} substitution is not POSIX compatible. Additionally, in
# bash 3.x, quotes do not escape slashes. This causes screwed up
# installation paths.
#
# SLES 11, bash-3.2-147.9.13
# $ dirname="foo/bar"
# $ echo ${dirname//"foo/bar"/"omg/nei"}
# bar/omg/nei/bar
#
# openSUSE 12.2, bash-4.2-51.6.1
# $ dirname="foo/bar"
# $ echo ${dirname//"foo/bar"/"omg/nei"}
# omg/nei
#
# openSUSE 12.2, dash-0.5.7-5.1.2.x86_64
# $ dirname="foo/bar"
# $ echo ${dirname//"foo/bar"/"omg/nei"}
# dash: 2: Bad substitution
#
# Source this file into your bash scripts to make available
# a replacement (the string_rep function) for this substitution
# mess.
#
string_rep()
{
# initialize vars
in=$1
unset out
# SEARCH must not be empty
test -n "$2" || return
while true; do
# break loop if SEARCH is no longer in "$in"
case "$in" in
*"$2"*) : ;;
*) break;;
esac
# append everything in "$in", up to the first instance of SEARCH, and REP, to "$out"
out=$out${in%%"$2"*}$3
# remove everything up to and including the first instance of SEARCH from "$in"
in=${in#*"$2"}
done
# append whatever is left in "$in" after the last instance of SEARCH to out, and print
printf '%s%s\n' "$out" "$in"
}
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