67394f9152
Move all the dependencies to their own derivation, so that we don't publish all of them if the wrapper is installed in a profile. The previous solution just moved them to a custom directory to avoid conflicts, this refactors that and completely hides them, while preserving the desired improvement of adding only one directory to each of the emacs search paths
124 lines
3.7 KiB
Nix
124 lines
3.7 KiB
Nix
/*
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# Usage
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`emacsWithPackages` takes a single argument: a function from a package
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set to a list of packages (the packages that will be available in
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Emacs). For example,
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```
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emacsWithPackages (epkgs: [ epkgs.evil epkgs.magit ])
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```
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All the packages in the list should come from the provided package
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set. It is possible to add any package to the list, but the provided
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set is guaranteed to have consistent dependencies and be built with
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the correct version of Emacs.
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# Overriding
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`emacsWithPackages` inherits the package set which contains it, so the
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correct way to override the provided package set is to override the
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set which contains `emacsWithPackages`. For example, to override
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`emacsPackagesNg.emacsWithPackages`,
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```
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let customEmacsPackages =
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emacsPackagesNg.override (super: self: {
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# use a custom version of emacs
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emacs = ...;
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# use the unstable MELPA version of magit
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magit = self.melpaPackages.magit;
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});
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in customEmacsPackages.emacsWithPackages (epkgs: [ epkgs.evil epkgs.magit ])
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```
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*/
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{ lib, lndir, makeWrapper, runCommand, stdenv }: self:
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with lib; let inherit (self) emacs; in
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packagesFun: # packages explicitly requested by the user
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let
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explicitRequires =
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if builtins.isFunction packagesFun
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then packagesFun self
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else packagesFun;
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in
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stdenv.mkDerivation {
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name = (appendToName "with-packages" emacs).name;
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nativeBuildInputs = [ emacs lndir makeWrapper ];
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inherit emacs explicitRequires;
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# Store all paths we want to add to emacs here, so that we only need to add
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# one path to the load lists
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deps = runCommand "emacs-packages-deps"
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{ inherit explicitRequires lndir emacs; }
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''
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mkdir -p $out/bin
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mkdir -p $out/share/emacs/site-lisp
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local 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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linkPath() {
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local pkg=$1
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local origin_path=$2
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local dest_path=$3
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# Add the path to the search path list, but only if it exists
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if [[ -d "$pkg/$origin_path" ]]; then
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$lndir/bin/lndir -silent "$pkg/$origin_path" "$out/$dest_path"
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fi
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}
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linkEmacsPackage() {
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linkPath "$1" "bin" "bin"
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linkPath "$1" "share/emacs/site-lisp" "share/emacs/site-lisp"
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}
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for pkg in $requires; do
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linkEmacsPackage $pkg
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done
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siteStart="$out/share/emacs/site-lisp/site-start.el"
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# A dependency may have brought the original siteStart, delete it and
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# create our own
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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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rm -f $siteStart
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cat >"$siteStart" <<EOF
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(load-file "$emacs/share/emacs/site-lisp/site-start.el")
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(add-to-list 'load-path "$out/share/emacs/site-lisp")
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(add-to-list 'exec-path "$out/bin")
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EOF
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# Byte-compiling improves start-up time only slightly, but costs nothing.
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$emacs/bin/emacs --batch -f batch-byte-compile "$siteStart"
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'';
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phases = [ "installPhase" ];
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installPhase = ''
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mkdir -p "$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 $emacs/bin/*; do # */
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local progname=$(basename "$prog")
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rm -f "$out/bin/$progname"
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makeWrapper "$prog" "$out/bin/$progname" \
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--suffix EMACSLOADPATH ":" "$deps/share/emacs/site-lisp:"
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done
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mkdir -p $out/share
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# Link icons and desktop files into place
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for dir in applications icons info man; do
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ln -s $emacs/share/$dir $out/share/$dir
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done
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'';
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inherit (emacs) meta;
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}
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