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helper.sh
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helper.sh
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#!/bin/bash
#
# Helper functions
function help_message() {
echo "Usage: bash setup.sh [COMMAND]"
echo ""
echo "Commands:"
echo " install [FILE] Read symbolic links configuration in FILE and"
echo " create symbolic links and move files to be"
echo " overwritten to ./.backup/"
echo " remove Remove all symbolic links."
echo " revert Remove all symbolic links and put backup files back"
echo " to original position."
}
# read configuration file
function read_conf() {
cat $1 |
sed 's/#.*$//g' | # replace comments with empty string
sed '/^$/d' # delete empty line
}
# ==================================
# Note: format of .backup_record
# Each Line: [link] [corresponding file in .backup]
# If no file be overwritten(move to .backup), then the second field is dot(.)
function _remove() {
if [ ! -e .backup_record ]; then
return
fi
while read -a line
do
echo "Delete ${line[0]}"
rm "${line[0]}"
done < .backup_record
rm .backup_record
}
function _install() {
_remove
touch .backup_record
read_conf "$1" |
while read -a line
do
# If there are files to be overwritten, move it into .backup
backup_file='.'
TARGET=$PWD/${line[0]}
LINK_NAME=$HOME/${line[1]}
if [ -e $LINK_NAME ]; then
echo "Move $LINK_NAME into $PWD/.backup/"
mv "$LINK_NAME" "$PWD/.backup/"
backup_file="$PWD/.backup/${line[1]}"
fi
# Create necessary folder
LINK_PARENT_FOLDER="$(dirname $LINK_NAME)"
if [ ! -e $LINK_PARENT_FOLDER ]; then
echo "Create folder $LINK_PARENT_FOLDER"
mkdir -p "$LINK_PARENT_FOLDER"
fi
# Create link
echo "Create link $LINK_NAME -> $TARGET"
ln -s "$TARGET" "$LINK_NAME"
# Write entry into .backup_record
echo "$LINK_NAME $backup_file" >> .backup_record
done
}
function _revert() {
if [ ! -e .backup_record ]; then
return
fi
while read -a line
do
echo "Delete ${line[0]}"
rm ${line[0]}
if [ "${line[1]}" != '.' ]; then
echo "Move ${line[1]} to ${line[0]}"
mv "${line[1]}" "${line[0]}"
fi
done < .backup_record
rm .backup_record
}