#!/bin/bash
#
# **inc/ini-config** - Configuration/INI functions
#
# Support for manipulating INI-style configuration files
#
# These functions have no external dependencies and no side-effects

# Save trace setting
INC_CONF_TRACE=$(set +o | grep xtrace)
set +o xtrace


# Config Functions
# ================

# Append a new option in an ini file without replacing the old value
# iniadd config-file section option value1 value2 value3 ...
function iniadd {
    local xtrace=$(set +o | grep xtrace)
    set +o xtrace
    local file=$1
    local section=$2
    local option=$3
    shift 3

    local values="$(iniget_multiline $file $section $option) $@"
    iniset_multiline $file $section $option $values
    $xtrace
}

# Comment an option in an INI file
# inicomment config-file section option
function inicomment {
    local xtrace=$(set +o | grep xtrace)
    set +o xtrace
    local file=$1
    local section=$2
    local option=$3

    sed -i -e "/^\[$section\]/,/^\[.*\]/ s|^\($option[ \t]*=.*$\)|#\1|" "$file"
    $xtrace
}

# Get an option from an INI file
# iniget config-file section option
function iniget {
    local xtrace=$(set +o | grep xtrace)
    set +o xtrace
    local file=$1
    local section=$2
    local option=$3
    local line

    line=$(sed -ne "/^\[$section\]/,/^\[.*\]/ { /^$option[ \t]*=/ p; }" "$file")
    echo ${line#*=}
    $xtrace
}

# Get a multiple line option from an INI file
# iniget_multiline config-file section option
function iniget_multiline {
    local xtrace=$(set +o | grep xtrace)
    set +o xtrace
    local file=$1
    local section=$2
    local option=$3
    local values

    values=$(sed -ne "/^\[$section\]/,/^\[.*\]/ { s/^$option[ \t]*=[ \t]*//gp; }" "$file")
    echo ${values}
    $xtrace
}

# Determinate is the given option present in the INI file
# ini_has_option config-file section option
function ini_has_option {
    local xtrace=$(set +o | grep xtrace)
    set +o xtrace
    local file=$1
    local section=$2
    local option=$3
    local line

    line=$(sed -ne "/^\[$section\]/,/^\[.*\]/ { /^$option[ \t]*=/ p; }" "$file")
    $xtrace
    [ -n "$line" ]
}

# Add another config line for a multi-line option.
# It's normally called after iniset of the same option and assumes
# that the section already exists.
#
# Note that iniset_multiline requires all the 'lines' to be supplied
# in the argument list. Doing that will cause incorrect configuration
# if spaces are used in the config values.
#
# iniadd_literal config-file section option value
function iniadd_literal {
    local xtrace=$(set +o | grep xtrace)
    set +o xtrace
    local file=$1
    local section=$2
    local option=$3
    local value=$4

    [[ -z $section || -z $option ]] && return

    # Add it
    sed -i -e "/^\[$section\]/ a\\
$option = $value
" "$file"

    $xtrace
}

# Remove an option from an INI file
# inidelete config-file section option
function inidelete {
    local xtrace=$(set +o | grep xtrace)
    set +o xtrace
    local file=$1
    local section=$2
    local option=$3

    [[ -z $section || -z $option ]] && return

    # Remove old values
    sed -i -e "/^\[$section\]/,/^\[.*\]/ { /^$option[ \t]*=/ d; }" "$file"

    $xtrace
}

# Set an option in an INI file
# iniset config-file section option value
function iniset {
    local xtrace=$(set +o | grep xtrace)
    set +o xtrace
    local file=$1
    local section=$2
    local option=$3
    local value=$4

    [[ -z $section || -z $option ]] && return

    if ! grep -q "^\[$section\]" "$file" 2>/dev/null; then
        # Add section at the end
        echo -e "\n[$section]" >>"$file"
    fi
    if ! ini_has_option "$file" "$section" "$option"; then
        # Add it
        sed -i -e "/^\[$section\]/ a\\
$option = $value
" "$file"
    else
        local sep=$(echo -ne "\x01")
        # Replace it
        sed -i -e '/^\['${section}'\]/,/^\[.*\]/ s'${sep}'^\('${option}'[ \t]*=[ \t]*\).*$'${sep}'\1'"${value}"${sep} "$file"
    fi
    $xtrace
}

# Set a multiple line option in an INI file
# iniset_multiline config-file section option value1 value2 valu3 ...
function iniset_multiline {
    local xtrace=$(set +o | grep xtrace)
    set +o xtrace
    local file=$1
    local section=$2
    local option=$3

    shift 3
    local values
    for v in $@; do
        # The later sed command inserts each new value in the line next to
        # the section identifier, which causes the values to be inserted in
        # the reverse order. Do a reverse here to keep the original order.
        values="$v ${values}"
    done
    if ! grep -q "^\[$section\]" "$file"; then
        # Add section at the end
        echo -e "\n[$section]" >>"$file"
    else
        # Remove old values
        sed -i -e "/^\[$section\]/,/^\[.*\]/ { /^$option[ \t]*=/ d; }" "$file"
    fi
    # Add new ones
    for v in $values; do
        sed -i -e "/^\[$section\]/ a\\
$option = $v
" "$file"
    done
    $xtrace
}

# Uncomment an option in an INI file
# iniuncomment config-file section option
function iniuncomment {
    local xtrace=$(set +o | grep xtrace)
    set +o xtrace
    local file=$1
    local section=$2
    local option=$3
    sed -i -e "/^\[$section\]/,/^\[.*\]/ s|[^ \t]*#[ \t]*\($option[ \t]*=.*$\)|\1|" "$file"
    $xtrace
}

function isset {
    nounset=$(set +o | grep nounset)
    set +o nounset
    [[ -n "${!1+x}" ]]
    result=$?
    $nounset
    return $result
}


# Restore xtrace
$INC_CONF_TRACE

# Local variables:
# mode: shell-script
# End: