opensde-nopast/bin/sde-config-ini

#!/bin/sh
# --- SDE-COPYRIGHT-NOTE-BEGIN ---
# This copyright note is auto-generated by ./scripts/Create-CopyPatch.
# 
# Filename: bin/sde-config-ini
# Copyright (C) 2006 - 2007 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 ---

[ -n "$SDEROOT" ] ||
	export SDEROOT=$( cd "${0%/*}/.."; pwd -P )

. $SDEROOT/lib/libsde.in

ini_usage() {
	local progname=${0##*/}
cat <<EOT
Usage:	$progname --file <file> [OPTIONS]

Options:
	[-s|--set] section.key=value
	[-g|--get] section.key
	[-d|--delete] section[.key]
	[-S|--sections]
	[-K|--keys] section

EOT
}

# dumps the raw content of a section
# USAGE: ini_section_raw "file" "section"
#
ini_section_raw() {
	gawk "BEGIN { show=0; }
	/^\[/ {
		if ( \$0 ~ /^\[$2\][ \t]*\$/ )
			show=1;
		else
			show=0;
		}
	/^[^\[]/ { if ( show ) print; }" "$1"
}

# dumps the content of a section assuming variables are defined in there
# USAGE: ini_section_read "file" "section"
#
ini_section_read() {
	ini_section_raw "$1" "$2" |
		sed -e '/^[ \t]*;/d;' -e '/^[ \t]*$/d;' -e 's,",\\",g' -e 's,=\(..*\)$,="\1",'
}


# 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
}

ini_do_set() { echo_abort 1 "Not yet implemented"; }
ini_do_get() {
	local section="${1%%.*}"
	local key="${1#*.}"

	if [ "$key" != "$section" ]; then
		# just one key
		ini_section_raw "$file" "$section" | sed -n \
			-e "s,^[ \t]*$key[ \t]*=\(.*\),\1,p"
	else
		ini_section_read "$file" "$section"
	fi
}

ini_do_delete() { echo_abort 1 "Not yet implemented"; }

shortopts='F:s:g:d:SK:'
longopts='file:,set:,get:,delete:,sections,keys:'
options=$( getopt -o "$shortopts" -l "$longopts" -- "$@" )
if [ $? -ne 0 ]; then
	ini_usage
	exit -1
fi

# load new arguments list
eval set -- "$options"

[ $# -ge 2 ] || ini_usage

file=
while [ $# -gt 0 ]; do
	case "$1" in
		-F|--file)	shift; file="$1" ;;
		--)	break ;;

		*)	[ -r "$file" ] || echo_abort 1 "${file:-none}: can't read."

			case "$1" in
				-s|--set)	shift; ini_do_set "$1"
						;;
				-g|--get)	shift; ini_do_get "$1"
						;;
				-d|--delete)	shift; ini_do_delete "$1"
						;;
				-S|--sections)
					sed -n -e 's,^\[\(.*\)\][ \t]*$,\1,p' "$file"
					;;
				-K|--keys)	shift;
					ini_section_raw "$file" "$1" |
						sed -n -e 's,^[ \t]*\([^;= ]*\)[ \t]*=.*,\1,p'
						;;
			esac
	esac
	shift
done