opensde-nopast/lib/libsde-ini.in

# --- SDE-COPYRIGHT-NOTE-BEGIN ---
# This copyright note is auto-generated by ./scripts/Create-CopyPatch.
# 
# Filename: lib/libsde-ini.in
# Copyright (C) 2006 The OpenSDE Project
# 
# More information can be found in the files COPYING and README.
# 
# 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; version 2 of the License. A copy of the
# GNU General Public License can be found in the file COPYING.
# --- SDE-COPYRIGHT-NOTE-END ---

# this file has to be sourced only by tools which really want to
# write ini formated files. reading methods are available at libsde.in

# writes a list of variables into a section of an ini file
# USAGE: ini_write "file" "section" var1 var2 var3 ...
#
ini_write() {
	local file="$1" section="$2" var= c=
	local tmpfile=
	shift 2

	# something to write?
	[ $# -gt 0 ] || return

	# make sure the file exists
	[ -f "$file" ] || touch "$file"
	tmpfile="$file.$$"

	# FIXME: a lock may be needed
	if grep -q "^\[$section\][ \t]*$" "$file"; then
		# known section
		#

		#FIXME: better performance may be required

		# split the file
		rm -rf $tmpfile.{0,1,2}
		gawk "BEGIN { level=0; }
		/^\[/ {
			if ( level == 0 && \$0 ~ /^\[$section\][ \t]*\$/ )
				level=1;
			else if ( level == 1 )
				level=2;
		}
		{ print > \"$tmpfile.\" level }
		" "$file"

		# remove empty lines
		sed -i -e '/^[ \t]*$/d;' $tmpfile.1

		# edit the section
		for var; do
			if grep -q "^$var=" $tmpfile.1; then
				sed -i -e "s|^$var=.*|$var=$( eval echo \$$var )|" $tmpfile.1
			else
				echo "$var=$( eval echo \$$var )" >> $tmpfile.1
			fi
		done

		# and finally write the new file!
		(
		cat $tmpfile.0
		cat $tmpfile.1
		if [ -s $tmpfile.2 ]; then
			echo
			cat $tmpfile.2
		fi
		) > "$file"

		rm -rf $tmpfile.{0,1,2}
	else
		# new section
		#
		echo -e "\n[$section]" >> "$file"
		for var; do
			echo "$var=$( eval echo \$$var )"
		done >> "$file"
	fi
}