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#!/usr/bin/env bash
set -euo pipefail
PROGRAM=$0
CURRENT_FILENAME=""
DESTINATION_FILENAME=""
function usage()
{
echo 1>&2 "USAGE: ${PROGRAM} CURRENT_FILENAME DESTINATION_FILENAME"
}
while [[ $# -gt 0 ]]
do
key="$1"
if [[ "$CURRENT_FILENAME" == "" ]]; then
CURRENT_FILENAME=$key
elif [[ "$DESTINATION_FILENAME" == "" ]]; then
DESTINATION_FILENAME=$key
else
usage
exit 30 # Error during arguments parsing
fi
shift # past argument or value
done
if [[ "$DESTINATION_FILENAME" == "" ]]; then
usage
exit 20 # Missing arguments CURRENT_FILENAME
elif [[ "$CURRENT_FILENAME" == "" ]]; then
usage
exit 10 # Missing arguments CURRENT_FILENAME
else
if [ -e "$DESTINATION_FILENAME" ]; then
echo 1>&2 "$DESTINATION_FILENAME already exists."
echo 1>&2 "Make sure to remove the destination first."
exit 40
fi
if [[ "$DESTINATION_FILENAME" == */ ]]; then
echo 1>&2 "$DESTINATION_FILENAME is not a file path."
exit 80
fi
if [[ "$DESTINATION_FILENAME" == */* ]]; then
DESTINATION_DIR="${DESTINATION_FILENAME%/*}"
if ! mkdir -p "$DESTINATION_DIR"; then
echo 1>&2 "Failed to create destination directory: $DESTINATION_DIR"
exit 160
fi
fi
echo "Copying $CURRENT_FILENAME into $DESTINATION_FILENAME"
# Pre-check that the source and destination will work
git mv --dry-run "${CURRENT_FILENAME}" "${DESTINATION_FILENAME}"
# Make a new branch and switch to it
BRANCH_NAME="git-cp-$(date +%s)"
git checkout -b "$BRANCH_NAME"
# Move the original file to the new destination, in this branch
git mv "${CURRENT_FILENAME}" "${DESTINATION_FILENAME}"
git commit -nm "--Duplicate $CURRENT_FILENAME history into $DESTINATION_FILENAME"
# Restore the original file to keep it in the history
git checkout HEAD~ "${CURRENT_FILENAME}"
git commit -nm "--Restore $CURRENT_FILENAME"
# Switch to the original branch and merge this back in.
git checkout -
git merge --no-ff "$BRANCH_NAME" -m "Copy $CURRENT_FILENAME into $DESTINATION_FILENAME"
# We're now done with the branch, so delete it.
# We shouldn't need -D here, as we've already merged it back in.
git branch -d "$BRANCH_NAME"
fi
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