Command-line wrapper to put commands within a nix-shell using the nearest parent shell.nix file.

nix-wrap

#!/usr/bin/env bash

# based on discussion: https://github.com/atom-haskell/haskell-ghc-mod/issues/160

origdir=$PWD

# Source nix env because this script is intended to be
# used by editors, e.g. Atom which doesn't source .bashrc,
# and we need NIX_PATH to be set correctly.
source /etc/profile

# Walk up the FS hierarchy until we find a shell.nix
while [ "$PWD" != "/" ] && [ ! -f shell.nix ]; do
    cd ..
done

# Arg list trick:
# https://stackoverflow.com/questions/3104209
ARGS=$(printf "%q"" " "$@")

# get a filename this is executed with
execf="$(basename $0)"
mydir="$(dirname $0)"

# Remove this script's basedir from PATH
PATH=":$PATH:"
PATH=${PATH//:$mydir:/:}
PATH=${PATH#:}
PATH=${PATH%:}

# Just in case
export PATH

# If we didn't find a shell.nix, give up.
if [ "$PWD" = "/" ]; then
    (>&2 echo "No shell.nix found")
    cd $origdir
    eval $execf $ARGS
else
    nixshelldir=$PWD
    (>&2 echo "Foud shell.nix in $nixshelldir")

    cd $origdir
    nix-shell $nixshelldir/shell.nix --run "$execf $ARGS"
fi

Similar to the original wrapper you just symlink this file to a location in path called like the executable you want to wrap