257 lines
6.9 KiB
Bash
257 lines
6.9 KiB
Bash
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#!/bin/bash
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# Copyright (c) 2009 Kevin Porter / Advanced Web Construction Ltd
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# (http://coding.tinternet.info, http://webutils.co.uk)
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# Copyright (c) 2010-2014 Ruediger Meier <sweet_f_a@gmx.de>
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# (https://github.com/rudimeier/)
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#
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# License: BSD-3-Clause, see LICENSE file
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#
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# Simple INI file parser.
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#
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# See README for usage.
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#
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#
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function read_ini() {
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# Be strict with the prefix, since it's going to be run through eval
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function check_prefix() {
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if ! [[ "${VARNAME_PREFIX}" =~ ^[a-zA-Z_][a-zA-Z0-9_]*$ ]]; then
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echo "read_ini: invalid prefix '${VARNAME_PREFIX}'" >&2
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return 1
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fi
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}
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function check_ini_file() {
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if [ ! -r "$INI_FILE" ]; then
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echo "read_ini: '${INI_FILE}' doesn't exist or not" \
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"readable" >&2
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return 1
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fi
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}
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# enable some optional shell behavior (shopt)
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function pollute_bash() {
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if ! shopt -q extglob; then
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SWITCH_SHOPT="${SWITCH_SHOPT} extglob"
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fi
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if ! shopt -q nocasematch; then
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SWITCH_SHOPT="${SWITCH_SHOPT} nocasematch"
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fi
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shopt -q -s ${SWITCH_SHOPT}
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}
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# unset all local functions and restore shopt settings before returning
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# from read_ini()
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function cleanup_bash() {
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shopt -q -u ${SWITCH_SHOPT}
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unset -f check_prefix check_ini_file pollute_bash cleanup_bash
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}
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local INI_FILE=""
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local INI_SECTION=""
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# {{{ START Deal with command line args
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# Set defaults
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local BOOLEANS=1
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local VARNAME_PREFIX=INI
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local CLEAN_ENV=0
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# {{{ START Options
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# Available options:
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# --boolean Whether to recognise special boolean values: ie for 'yes', 'true'
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# and 'on' return 1; for 'no', 'false' and 'off' return 0. Quoted
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# values will be left as strings
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# Default: on
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#
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# --prefix=STRING String to begin all returned variables with (followed by '__').
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# Default: INI
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#
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# First non-option arg is filename, second is section name
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while [ $# -gt 0 ]; do
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case $1 in
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--clean | -c)
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CLEAN_ENV=1
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;;
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--booleans | -b)
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shift
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BOOLEANS=$1
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;;
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--prefix | -p)
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shift
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VARNAME_PREFIX=$1
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;;
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*)
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if [ -z "$INI_FILE" ]; then
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INI_FILE=$1
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else
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if [ -z "$INI_SECTION" ]; then
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INI_SECTION=$1
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fi
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fi
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;;
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esac
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shift
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done
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if [ -z "$INI_FILE" ] && [ "${CLEAN_ENV}" = 0 ]; then
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echo -e "Usage: read_ini [-c] [-b 0| -b 1]] [-p PREFIX] FILE" \
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"[SECTION]\n or read_ini -c [-p PREFIX]" >&2
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cleanup_bash
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return 1
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fi
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if ! check_prefix; then
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cleanup_bash
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return 1
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fi
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local INI_ALL_VARNAME="${VARNAME_PREFIX}__ALL_VARS"
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local INI_ALL_SECTION="${VARNAME_PREFIX}__ALL_SECTIONS"
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local INI_NUMSECTIONS_VARNAME="${VARNAME_PREFIX}__NUMSECTIONS"
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if [ "${CLEAN_ENV}" = 1 ]; then
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eval unset "\$${INI_ALL_VARNAME}"
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fi
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unset ${INI_ALL_VARNAME}
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unset ${INI_ALL_SECTION}
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unset ${INI_NUMSECTIONS_VARNAME}
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if [ -z "$INI_FILE" ]; then
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cleanup_bash
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return 0
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fi
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if ! check_ini_file; then
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cleanup_bash
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return 1
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fi
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# Sanitise BOOLEANS - interpret "0" as 0, anything else as 1
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if [ "$BOOLEANS" != "0" ]; then
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BOOLEANS=1
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fi
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# }}} END Options
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# }}} END Deal with command line args
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local LINE_NUM=0
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local SECTIONS_NUM=0
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local SECTION=""
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# IFS is used in "read" and we want to switch it within the loop
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local IFS=$' \t\n'
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local IFS_OLD="${IFS}"
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# we need some optional shell behavior (shopt) but want to restore
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# current settings before returning
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local SWITCH_SHOPT=""
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pollute_bash
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while read -r line || [ -n "$line" ]; do
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#echo line = "$line"
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((LINE_NUM++))
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# Skip blank lines and comments
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if [ -z "$line" -o "${line:0:1}" = ";" -o "${line:0:1}" = "#" ]; then
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continue
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fi
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# Section marker?
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if [[ "${line}" =~ ^\[[a-zA-Z0-9_]{1,}\]$ ]]; then
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# Set SECTION var to name of section (strip [ and ] from section marker)
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SECTION="${line#[}"
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SECTION="${SECTION%]}"
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eval "${INI_ALL_SECTION}=\"\${${INI_ALL_SECTION}# } $SECTION\""
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((SECTIONS_NUM++))
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continue
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fi
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# Are we getting only a specific section? And are we currently in it?
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if [ ! -z "$INI_SECTION" ]; then
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if [ "$SECTION" != "$INI_SECTION" ]; then
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continue
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fi
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fi
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# Valid var/value line? (check for variable name and then '=')
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if ! [[ "${line}" =~ ^[a-zA-Z0-9._]{1,}[[:space:]]*= ]]; then
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echo "Error: Invalid line:" >&2
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echo " ${LINE_NUM}: $line" >&2
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cleanup_bash
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return 1
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fi
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# split line at "=" sign
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IFS="="
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read -r VAR VAL <<<"${line}"
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IFS="${IFS_OLD}"
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# delete spaces around the equal sign (using extglob)
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VAR="${VAR%%+([[:space:]])}"
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VAL="${VAL##+([[:space:]])}"
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VAR=$(echo $VAR)
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# Construct variable name:
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# ${VARNAME_PREFIX}__$SECTION__$VAR
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# Or if not in a section:
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# ${VARNAME_PREFIX}__$VAR
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# In both cases, full stops ('.') are replaced with underscores ('_')
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if [ -z "$SECTION" ]; then
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VARNAME=${VARNAME_PREFIX}__${VAR//./_}
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else
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VARNAME=${VARNAME_PREFIX}__${SECTION}__${VAR//./_}
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fi
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eval "${INI_ALL_VARNAME}=\"\${${INI_ALL_VARNAME}# } ${VARNAME}\""
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if [[ "${VAL}" =~ ^\".*\"$ ]]; then
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# remove existing double quotes
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VAL="${VAL##\"}"
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VAL="${VAL%%\"}"
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elif [[ "${VAL}" =~ ^\'.*\'$ ]]; then
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# remove existing single quotes
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VAL="${VAL##\'}"
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VAL="${VAL%%\'}"
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elif [ "$BOOLEANS" = 1 ]; then
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# Value is not enclosed in quotes
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# Booleans processing is switched on, check for special boolean
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# values and convert
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# here we compare case insensitive because
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# "shopt nocasematch"
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case "$VAL" in
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yes | true | on)
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VAL=1
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;;
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no | false | off)
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VAL=0
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;;
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esac
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fi
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# enclose the value in single quotes and escape any
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# single quotes and backslashes that may be in the value
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VAL="${VAL//\\/\\\\}"
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VAL="\$'${VAL//\'/\'}'"
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eval "$VARNAME=$VAL"
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done <"${INI_FILE}"
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# return also the number of parsed sections
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eval "$INI_NUMSECTIONS_VARNAME=$SECTIONS_NUM"
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cleanup_bash
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}
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