comma.bash

#!@bash@/bin/bash

# Special case: if the program is `sudo` we actually run the utility with
# `sudo` instead of looking for a package with `/bin/sudo`.
specials=()
while [ "$1" = "sudo" -o "$1" = "rlwrap" ]; do
	specials+=("$1")
	shift
done

if [ $# -lt 1 ]; then
	echo >&2 "Usage: $0 [sudo] program [args...]"
	exit 1
fi

program="$1"

# Find all packages that contain the binary we're trying to run, discarding:
# - packages that just wrap other programs (currently just cope)
# - "Unwrapped" packages (which are more useful in their wrapped version)
mapfile -t derivations < <(@nix-index@/bin/nix-locate --minimal --whole-name /bin/"$program" | @toybox@/bin/egrep -v '^cope\.out|.*-unwrapped\.out$')

case ${#derivations[@]} in
	0)
		echo >&2 "Executable '$program' not found in database"
		exit 1
		;;
	1)
		derivation="${derivations[0]}"
		;;
	*)
		derivation="$(printf '%s\n' "${derivations[@]}" | @fzy@/bin/fzy)"
		;;
esac

# If user presses CTRL-D then `give` will give empty string.
if [ -z "$derivation" ]; then
	echo "No derivation selected. Aborting." >&2
	exit 1
fi

# TODO: The official comma uses -f <nixpkgs> if it is defined in path. We should do that too, depending on the behavior of nix-index.
@nix@/bin/nix --extra-experimental-features 'nix-command flakes' shell nixpkgs#"$derivation" --command "${specials[@]}" "$@"