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#! @shell@
set -e
set -o pipefail
export PATH=@path@:$PATH
evalNix() {
nix-instantiate --eval --strict "${extraEvalFlags[@]}" -E "with import <darwin> {}; $*" 2>/dev/null
}
evalOpt() {
evalNix "options.$option.$*"
}
evalOptAttrs() {
evalNix "builtins.concatStringsSep \"\\n\" (builtins.attrNames $*)" | jq -r .
}
evalOptText() {
evalNix "options.$option.$*" | jq -r .
}
showSyntax() {
echo "$0: [-I path] <option>" >&2
evalOptAttrs "options"
exit 1
}
# Parse the command line.
origArgs=("$@")
extraEvalFlags=()
option=
while [ "$#" -gt 0 ]; do
i="$1"; shift 1
case "$i" in
--help)
showSyntax
;;
-I)
if [ -z "$1" ]; then
echo "$0: ‘$i’ requires an argument"
exit 1
fi
j="$1"; shift 1
extraEvalFlags+=("$i" "$j")
;;
*)
option="$i"
;;
esac
done
if [ -z "$option" ]; then showSyntax; fi
if [ "$(evalOpt "_type")" = '"option"' ]; then
echo "Value:"
evalOpt "value" || echo "no value"
echo
echo "Default:"
evalOpt "default" || evalOptText "defaultText" || echo "no default"
echo
echo "Example:"
if [ "$(evalOpt "example._type")" = '"literalExpression"' ]; then
evalOptText "example.text" || echo "no example"
else
evalOpt "example" || echo "no example"
fi
echo
echo "Description:"
evalOptText "description.text" || echo "no description"
echo
else
evalOptAttrs "options.$option"
fi
|
