71 lines
2.0 KiB
Bash
71 lines
2.0 KiB
Bash
#!/bin/bash
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# Copyright (C) 2013 Jan Engelhardt <jengelh@inai.de>
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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 2 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, write to the
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# Free Software Foundation, Inc.,
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# 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
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# from http://mywiki.wooledge.org/BashFAQ/021
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# The ${a/b/c} substitution is not POSIX compatible. Additionally, in
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# bash 3.x, quotes do not escape slashes. This causes screwed up
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# installation paths.
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#
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# SLES 11, bash-3.2-147.9.13
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# $ dirname="foo/bar"
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# $ echo ${dirname//"foo/bar"/"omg/nei"}
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# bar/omg/nei/bar
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#
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# openSUSE 12.2, bash-4.2-51.6.1
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# $ dirname="foo/bar"
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# $ echo ${dirname//"foo/bar"/"omg/nei"}
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# omg/nei
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#
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# openSUSE 12.2, dash-0.5.7-5.1.2.x86_64
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# $ dirname="foo/bar"
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# $ echo ${dirname//"foo/bar"/"omg/nei"}
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# dash: 2: Bad substitution
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#
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# Source this file into your bash scripts to make available
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# a replacement (the string_rep function) for this substitution
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# mess.
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#
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string_rep()
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{
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# initialize vars
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in=$1
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unset out
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# SEARCH must not be empty
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test -n "$2" || return
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while true; do
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# break loop if SEARCH is no longer in "$in"
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case "$in" in
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*"$2"*) : ;;
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*) break;;
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esac
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# append everything in "$in", up to the first instance of SEARCH, and REP, to "$out"
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out=$out${in%%"$2"*}$3
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# remove everything up to and including the first instance of SEARCH from "$in"
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in=${in#*"$2"}
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done
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# append whatever is left in "$in" after the last instance of SEARCH to out, and print
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printf '%s%s\n' "$out" "$in"
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}
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