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#!/bin/bash
declare -gA luaPathsSeen=()
# shellcheck disable=SC2164,SC2041
nix_print() {
if [ ${NIX_DEBUG:-0} -ge $1 ]; then
echo "$2"
fi
}
nix_debug() {
nix_print 3 "$1"
}
addToLuaSearchPathWithCustomDelimiter() {
local varName="$1"
local absPattern="$2"
# export only if we haven't already got this dir in the search path
if [[ ${!varName-} == *"$absPattern"* ]]; then return; fi
# if the path variable has not yet been set, initialize it to ";;"
# this is a magic value that will be replaced by the default,
# allowing relative modules to be used even when there are system modules.
if [[ ! -v "${varName}" ]]; then export "${varName}=;;"; fi
# export only if the folder contains lua files
shopt -s globstar
local adjustedPattern="${absPattern/\?/\*\*\/\*}"
for _file in $adjustedPattern; do
export "${varName}=${!varName:+${!varName};}${absPattern}"
shopt -u globstar
return;
done
shopt -u globstar
}
# used in setup Hooks to load LUA_PATH and LUA_CPATH
# luaEnvHook
luaEnvHook() {
_addToLuaPath "$1"
}
addToLuaPath() {
local dir="$1"
if [ ! -d "$dir" ]; then
nix_debug "$dir not a directory abort"
return 0
fi
cd "$dir"
for pattern in @luapathsearchpaths@; do
addToLuaSearchPathWithCustomDelimiter LUA_PATH "$PWD/$pattern"
done
# LUA_CPATH
for pattern in @luacpathsearchpaths@; do
addToLuaSearchPathWithCustomDelimiter LUA_CPATH "$PWD/$pattern"
done
cd - >/dev/null
}
_addToLuaPath() {
local dir="$1"
nix_debug "_addToLuaPath called for dir $dir"
if [[ ! -d "$dir" ]]; then
nix_debug "$dir not a directory abort"
return 0
fi
# set -x
# if [ -n "${pythonPathsSeen[$dir]}" ]; then return; fi
if [[ -n "${luaPathsSeen[$dir]:-}" ]]; then
# if [ -n "${luaPathsSeen[$dir]}" ]; then
nix_debug "$dir already parsed"
return
fi
luaPathsSeen["$dir"]=true
# shellcheck disable=SC2164
cd "$dir"
for pattern in @luapathsearchpaths@; do
addToLuaSearchPathWithCustomDelimiter LUA_PATH "$PWD/$pattern"
done
# LUA_CPATH
for pattern in @luacpathsearchpaths@; do
addToLuaSearchPathWithCustomDelimiter LUA_CPATH "$PWD/$pattern"
done
cd - >/dev/null
addToSearchPath program_PATH "$dir"/bin
# Inspect the propagated inputs (if they exist) and recur on them.
local prop="$dir/nix-support/propagated-build-inputs"
if [ -e "$prop" ]; then
local new_path
for new_path in $(cat $prop); do
nix_debug "newpath: $new_path"
_addToLuaPath "$new_path"
done
fi
}
# Builds environment variables like LUA_PATH and PATH walking through closure
# of dependencies.
buildLuaPath() {
local luaPath="$1"
local path
nix_debug "BUILD_LUA_PATH"
# # Create an empty table of paths (see doc on loadFromPropagatedInputs
# # for how this is used). Build up the program_PATH variable.
# # shellcheck disable=SC2034
program_PATH=
for path in $luaPath; do
_addToLuaPath "$path"
done
}
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