emacs-packages: Cleanup and document for overrides
This removes some stale code that was a no-op for some time and adds some docs/examples to help people with explicitly and consistently choosing versions of some emacs packages (to help with problems similar to #27083).
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@ -660,6 +660,32 @@ cp ${myEmacsConfig} $out/share/emacs/site-lisp/default.el
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passing <command>-q</command> to the Emacs command.
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</para>
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<para>
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Sometimes <varname>emacsWithPackages</varname> is not enough, as
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this package set has some priorities imposed on packages (with
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the lowest priority assigned to Melpa Unstable, and the highest for
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packages manually defined in
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<filename>pkgs/top-level/emacs-packages.nix</filename>). But you
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can't control this priorities when some package is installed as a
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dependency. You can override it on per-package-basis, providing all
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the required dependencies manually - but it's tedious and there is
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always a possibility that an unwanted dependency will sneak in
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through some other package. To completely override such a package
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you can use <varname>overrideScope</varname>.
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</para>
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<screen>
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overrides = super: self: rec {
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haskell-mode = self.melpaPackages.haskell-mode;
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...
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};
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((emacsPackagesNgGen emacs).overrideScope overrides).emacsWithPackages (p: with p; [
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# here both these package will use haskell-mode of our own choice
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ghc-mod
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dante
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])
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</screen>
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</section>
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</section>
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@ -14409,8 +14409,6 @@ with pkgs;
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emacs25Packages = emacsPackagesGen emacs25 pkgs.emacs25Packages;
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emacsPackagesNgGen = emacs: import ./emacs-packages.nix {
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overrides = (config.emacsPackageOverrides or (p: {})) pkgs;
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inherit lib newScope stdenv;
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inherit fetchFromGitHub fetchgit fetchhg fetchurl;
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inherit emacs texinfo makeWrapper runCommand;
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@ -32,9 +32,7 @@
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# `meta` with `platforms` and `homepage` set to something you are
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# unlikely to want to override for most packages
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{ overrides
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, lib, newScope, stdenv, fetchurl, fetchgit, fetchFromGitHub, fetchhg, runCommand
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{ lib, newScope, stdenv, fetchurl, fetchgit, fetchFromGitHub, fetchhg, runCommand
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, emacs, texinfo, lndir, makeWrapper
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, trivialBuild
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