nixpkgs/pkgs/build-support/emacs/setup-hook.sh

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addToEmacsLoadPath() {
local lispDir="$1"
if [[ -d $lispDir && ${EMACSLOADPATH-} != *"$lispDir":* ]] ; then
# It turns out, that the trailing : is actually required
# see https://www.gnu.org/software/emacs/manual/html_node/elisp/Library-Search.html
export EMACSLOADPATH="$lispDir:${EMACSLOADPATH-}"
fi
}
addEmacsVars () {
addToEmacsLoadPath "$1/share/emacs/site-lisp"
# Add sub paths to the Emacs load path if it is a directory
# containing .el files. This is necessary to build some packages,
# e.g., using trivialBuild.
for lispDir in \
"$1/share/emacs/site-lisp/"* \
"$1/share/emacs/site-lisp/elpa/"*; do
if [[ -d $lispDir && "$(echo "$lispDir"/*.el)" ]] ; then
addToEmacsLoadPath "$lispDir"
fi
done
}
if [[ ! -v emacsHookDone ]]; then
emacsHookDone=1
# If this is for a wrapper derivation, emacs and the dependencies are all
# run-time dependencies. If this is for precompiling packages into bytecode,
# emacs is a compile-time dependency of the package.
addEnvHooks "$hostOffset" addEmacsVars
addEnvHooks "$targetOffset" addEmacsVars
fi