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#!/bin/bash
###############################
# exposes library functions to modify properties in a property
#
# TODO function append_property
#
###############################
set -euo pipefail
function cnt_lines() {
FILE=$1
cat $FILE | wc -l
}
function write_prop() {
PROPERTY=$1
VALUE=$2
FILE=$3
# uncomment below to help debug calls to set_property
#echo "setting property $PROPERTY to value $VALUE in $FILE"
echo "" >> $FILE
echo "${PROPERTY}=${VALUE}" >> $FILE
}
function set_property() {
PROPERTY=$1
VALUE=$2
FILE=$3
REGEXP="${PROPERTY//\./\\.}\\s*="
if grep -q "$REGEXP" "$FILE"; then
# delete line of specified property
LINE_COUNT=$(cnt_lines $FILE)
if [[ "$OSTYPE" == "darwin"* ]]; then
sed -i '' /${REGEXP}/d "$FILE"
else
sed -i /${REGEXP}/d "$FILE"
fi
# add property if at least one line deleted
NEW_LINE_COUNT=$(cnt_lines $FILE)
if [[ $LINE_COUNT -gt $NEW_LINE_COUNT ]]; then
write_prop $PROPERTY $VALUE $FILE
fi
else
write_prop $PROPERTY $VALUE $FILE
fi
}
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