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#!/bin/bash

# usage example:

# $ , yarn --help

# This finds a derivation providing a bin/yarn, and runs it with `nix run`.

# If there are multiple candidates, the user chooses one using `fzy`.

set -euo pipefail

if [[ $# -lt 1 ]]; then

>&2 echo "usage: , <program> [arguments]"

exit 1

if [[ "$1" == "--install" ]] || [[ "$1" == "-i" ]]; then

install=1

shift

else

install=""

argv0=$1; shift

case "${argv0}" in

@OVERLAY_PACKAGES@)

attr="${argv0}"

;;

attr="$(nix-locate --db "${NIX_INDEX_DB}" --top-level --minimal --at-root --whole-name "/bin/${argv0}")"

if [[ "$(echo "${attr}" | wc -l)" -ne 1 ]]; then

attr="$(echo "${attr}" | fzy)"

;;

esac

if [[ -z $attr ]]; then

>&2 echo "no match"

exit 1

if [[ -n $install ]]; then

nix-env -iA "nixpkgs.${attr%%.*}"

else

nix run "nixpkgs.${attr}" -c "${argv0}" "$@"