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Diffstat (limited to 'doc/package-notes.xml')
| -rw-r--r-- | doc/package-notes.xml | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/doc/package-notes.xml b/doc/package-notes.xml index b657f5809db9..2d6c87c3d07a 100644 --- a/doc/package-notes.xml +++ b/doc/package-notes.xml @@ -660,6 +660,32 @@ cp ${myEmacsConfig} $out/share/emacs/site-lisp/default.el passing <command>-q</command> to the Emacs command. </para> +<para> + Sometimes <varname>emacsWithPackages</varname> is not enough, as + this package set has some priorities imposed on packages (with + the lowest priority assigned to Melpa Unstable, and the highest for + packages manually defined in + <filename>pkgs/top-level/emacs-packages.nix</filename>). But you + can't control this priorities when some package is installed as a + dependency. You can override it on per-package-basis, providing all + the required dependencies manually - but it's tedious and there is + always a possibility that an unwanted dependency will sneak in + through some other package. To completely override such a package + you can use <varname>overrideScope</varname>. +</para> + +<screen> +overrides = super: self: rec { + haskell-mode = self.melpaPackages.haskell-mode; + ... +}; +((emacsPackagesNgGen emacs).overrideScope overrides).emacsWithPackages (p: with p; [ + # here both these package will use haskell-mode of our own choice + ghc-mod + dante +]) +</screen> + </section> </section> |