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sh.subst
## ## subst -- Apply sed(1) substitution operations ## Copyright (c) 2001-2008 Ralf S. Engelschall <rse@engelschall.com> ## ## This file is part of shtool and 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 file 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, ## USA, or contact Ralf S. Engelschall <rse@engelschall.com>. ## str_tool="subst" str_usage="[-v|--verbose] [-t|--trace] [-n|--nop] [-w|--warning] [-q|--quiet] [-s|--stealth] [-i|--interactive] [-b|--backup <ext>] [-e|--exec <cmd>] [-f|--file <cmd-file>] [<file>] [...]" gen_tmpfile=yes arg_spec="0+" opt_spec="v.t.n.w.q.s.i.b:e+f:" opt_alias="v:verbose,t:trace,n:nop,w:warning,q:quiet,s:stealth,i:interactive,b:backup,e:exec,f:file" opt_v=no opt_t=no opt_n=no opt_w=no opt_q=no opt_s=no opt_i=no opt_b="" opt_e="" opt_f="" . ./sh.common # remember optional list of file(s) files="$*" files_num="$#" # parameter consistency check if [ $# -eq 0 ] && [ ".$opt_b" != . ]; then echo "$msgprefix:Error: option -b cannot be applied to stdin" 1>&2 shtool_exit 1 fi if [ $# -eq 0 ] && [ ".$opt_s" = .yes ]; then echo "$msgprefix:Error: option -s cannot be applied to stdin" 1>&2 shtool_exit 1 fi # build underlying sed(1) command sedcmd='sed' if [ ".$opt_e" != . ]; then OIFS="$IFS"; IFS="$ASC_NL"; set -- $opt_e; IFS="$OIFS" for e do sedcmd="$sedcmd -e '$e'" done elif [ ".$opt_f" != . ]; then if [ ! -f $opt_f ]; then echo "$msgprefix:Error: command file \`$opt_f' not found or not a regular file" 1>&2 shtool_exit 1 fi sedcmd="$sedcmd -f '$opt_f'" else echo "$msgprefix:Error: either -e option(s) or -f option required" 1>&2 shtool_exit 1 fi # determine extension for original file orig=".orig" if [ ".$opt_b" != . ]; then orig="$opt_b" fi # apply sed(1) operation(s) if [ ".$files" != . ]; then # apply operation(s) to files substdone=no for file in $files; do test ".$file" = . && continue if [ ! -f $file ]; then echo "$msgprefix:Warning: file \`$file' not found or not a regular file" 1>&2 continue fi # handle interactive mode if [ ".$opt_i" = .yes ]; then eval "$sedcmd <$file >$file.new" skip=no if cmp $file $file.new >/dev/null 2>&1; then rm -f $file.new skip=yes else (diff -U1 $file $file.new >$tmpfile) 2>/dev/null if [ ".`cat $tmpfile`" = . ]; then (diff -C1 $file $file.new >$tmpfile) 2>/dev/null if [ ".`cat $tmpfile`" = . ]; then echo "$msgprefix:Warning: unable to show difference for file \`$file'" 1>&2 cp /dev/null $tmpfile fi fi rm -f $file.new cat $tmpfile echo dummy | awk '{ printf("%s", TEXT); }' TEXT=">>> Apply [Y/n]: " read input if [ ".$input" != .Y ] &&\ [ ".$input" != .y ] &&\ [ ".$input" != . ]; then skip=yes fi fi if [ ".$skip" = .yes ]; then if [ ".$opt_v" = .yes ]; then echo "file \`$file' -- skipped" 1>&2 fi continue fi fi # apply sed(1) operation(s) if [ ".$opt_v" = .yes ]; then echo "patching \`$file'" 1>&2 fi if [ ".$opt_t" = .yes ]; then echo "\$ cp -p $file $file$orig" echo "\$ chmod u+w $file" echo "\$ $sedcmd <$file$orig >$file" fi if [ ".$opt_n" = .no ]; then cp -p $file $file$orig chmod u+w $file >/dev/null 2>&1 || true eval "$sedcmd <$file$orig >$file" fi # optionally fix timestamp if [ ".$opt_s" = .yes ]; then if [ ".$opt_t" = .yes ]; then echo "\$ touch -r $file$orig $file" fi if [ ".$opt_n" = .no ]; then touch -r $file$orig $file fi fi # optionally check whether any content change actually occurred if [ ".$opt_q" = .no ]; then if cmp $file$orig $file >/dev/null 2>&1; then if [ ".$opt_w" = .yes ]; then echo "$msgprefix:Warning: substitution resulted in no content change on file \"$file\"" 1>&2 fi else substdone=yes fi fi # optionally remove preserved original file if [ ".$opt_b" = . ]; then if [ ".$opt_t" = .yes ]; then echo "\$ rm -f $file$orig" fi if [ ".$opt_n" = .no ]; then rm -f $file$orig fi fi done if [ ".$opt_q" = .no ] && [ ".$opt_w" = .no ]; then if [ ".$substdone" = .no ]; then if [ ".$files_num" = .1 ]; then echo "$msgprefix:Warning: substitution resulted in no content change on file \"$file\"" 1>&2 else echo "$msgprefix:Warning: substitution resulted in no content change on any file" 1>&2 fi fi fi else # apply operation(s) to stdin/stdout if [ ".$opt_v" = .yes ]; then echo "patching <stdin>" 1>&2 fi if [ ".$opt_t" = .yes ]; then echo "\$ $sedcmd" fi if [ ".$opt_n" = .no ]; then eval "$sedcmd" fi fi shtool_exit 0 ## ## manual page ## =pod =head1 NAME B<shtool-subst> - B<GNU shtool> sed(1) substitution operations =head1 SYNOPSIS B<shtool subst> [B<-v>|B<--verbose>] [B<-t>|B<--trace>] [B<-n>|B<--nop>] [B<-w>|B<--warning>] [B<-q>|B<--quiet>] [B<-s>|B<--stealth>] [B<-i>|B<--interactive>] [B<-b>|B<--backup> I<ext>] [B<-e>|B<--exec> I<cmd>] [B<-f>|B<--file> I<cmd-file>] [I<file>] [I<file> ...] =head1 DESCRIPTION This command applies one or more sed(1) substitution operations to F<stdin> or any number of files. =head1 OPTIONS The following command line options are available. =over 4 =item B<-v>, B<--verbose> Display some processing information. =item B<-t>, B<--trace> Enable the output of the essential shell commands which are executed. =item B<-n>, B<--nop> No operation mode. Actual execution of the essential shell commands which would be executed is suppressed. =item B<-w>, B<--warning> Show warning on substitution operation resulting in no content change on I<every> file. The default is to show a warning on substitution operations resulted in no content change on I<all> files. =item B<-q>, B<--quiet> Suppress warning on substitution operation resulting in no content change. =item B<-s>, B<--stealth> Stealth operation. Preserve timestamp on I<file>. =item B<-i>, B<--interactive> Enter interactive mode where the user has to approve each operation. =item B<-b>, B<--backup> I<ext> Preserve backup of original file using file name extension I<ext>. Default is to overwrite the original file. =item B<-e>, B<--exec> I<cmd> Specify sed(1) command directly. =item B<-f>, B<--file> I<cmd-file> Read sed(1) command from I<file>. =back =head1 EXAMPLE # shell script shtool subst -i -e 's;(c) \([0-9]*\)-2000;(c) \1-2001;' *.[ch] # RPM spec-file %install shtool subst -v -n \ -e 's;^\(prefix=\).*;\1 $RPM_BUILD_ROOT%{_prefix};g' \ -e 's;^\(sysconfdir=\).*;\1 $RPM_BUILD_ROOT%{_prefix}/etc;g' \ `find . -name Makefile -print` make install =head1 HISTORY The B<GNU shtool> B<subst> command was originally written by Ralf S. Engelschall E<lt>rse@engelschall.comE<gt> in 2001 for B<GNU shtool>. It was prompted by the need to have a uniform and convenient patching frontend to sed(1) operations in the B<OpenPKG> package specifications. =head1 SEE ALSO shtool(1), sed(1). =cut