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#!/usr/bin/env bash
main() {
if [[ "$#" -ne 2 ]]; then
echo "Usage: guard_path.sh <path> <confirmation_prompt>" >&2
exit 1
fi
if [ -t 1 ]; then
path="$(_to_realpath "$1")"
confirmation_prompt="$2"
if [[ ! "$path" == "$(pwd)"* ]]; then
read -r -p "$confirmation_prompt [Y/n] " ans
if [[ "$ans" == "N" || "$ans" == "n" ]]; then
echo "error: aborted!" >&2
exit 1
fi
fi
fi
}
_to_realpath() {
path="$1"
if [[ $OS == "Windows_NT" ]]; then
path="$(cygpath -u "$path")"
fi
awk -v path="$path" -v pwd="$PWD" '
BEGIN {
if (path !~ /^\//) {
path = pwd "/" path
}
if (path ~ /\/\.{1,2}?$/) {
isDir = 1
}
split(path, parts, "/")
newPartsLength = 0
for (i = 1; i <= length(parts); i++) {
part = parts[i]
if (part == "..") {
if (newPartsLength > 0) {
delete newParts[newPartsLength--]
}
} else if (part != "." && part != "") {
newParts[++newPartsLength] = part
}
}
if (isDir == 1 || newPartsLength == 0) {
newParts[++newPartsLength] = ""
}
printf "/"
for (i = 1; i <= newPartsLength; i++) {
newPart = newParts[i]
printf newPart
if (i < newPartsLength) {
printf "/"
}
}
}'
}
main "$@"
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