forked from mirrors/nixpkgs
72 lines
2.4 KiB
Nix
72 lines
2.4 KiB
Nix
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{ stdenv, makeWrapper, emacs }:
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with stdenv.lib;
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explicitRequires: # packages explicitly requested by the user
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stdenv.mkDerivation {
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name = (appendToName "with-packages" emacs).name;
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nativeBuildInputs = [ emacs makeWrapper ];
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inherit emacs explicitRequires;
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phases = [ "installPhase" ];
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installPhase = ''
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requires=""
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for pkg in $explicitRequires; do
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findInputs $pkg requires propagated-user-env-packages
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done
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# requires now holds all requested packages and their transitive dependencies
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siteStart="$out/share/emacs/site-lisp/site-start.el"
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addEmacsPath() {
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local list=$1
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local path=$2
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# Add the path to the search path list, but only if it exists
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if [[ -d "$path" ]]; then
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echo "(add-to-list '$list \"$path\")" >>"$siteStart"
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fi
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}
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# Add a dependency's paths to site-start.el
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addToEmacsPaths() {
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addEmacsPath "exec-path" "$1/bin"
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addEmacsPath "load-path" "$1/share/emacs/site-lisp"
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addEmacsPath "package-directory-list" "$1/share/emacs/site-lisp/elpa"
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}
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mkdir -p $out/share/emacs/site-lisp
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# Begin the new site-start.el by loading the original, which sets some
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# NixOS-specific paths. Paths are searched in the reverse of the order
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# they are specified in, so user and system profile paths are searched last.
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echo "(load-file \"$emacs/share/emacs/site-lisp/site-start.el\")" >"$siteStart"
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echo "(require 'package)" >>"$siteStart"
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# Set paths for the dependencies of the requested packages. These paths are
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# searched before the profile paths, but after the explicitly-required paths.
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for pkg in $requires; do
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# The explicitly-required packages are also in the list, but we will add
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# those paths last.
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if ! ( echo "$explicitRequires" | grep "$pkg" >/dev/null ) ; then
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addToEmacsPaths $pkg
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fi
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done
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# Finally, add paths for all the explicitly-required packages. These paths
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# will be searched first.
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for pkg in $explicitRequires; do
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addToEmacsPaths $pkg
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done
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# Byte-compiling improves start-up time only slightly, but costs nothing.
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emacs --batch -f batch-byte-compile "$siteStart"
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mkdir -p $out/bin
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# Wrap emacs and friends so they find our site-start.el before the original.
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for prog in $emacs/bin/*; do # */
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makeWrapper "$prog" $out/bin/$(basename "$prog") \
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--suffix EMACSLOADPATH ":" "$out/share/emacs/site-lisp:"
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done
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'';
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inherit (emacs) meta;
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}
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