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author | Alexey Lebedeff <binarin@binarin.ru> | 2017-11-06 11:03:30 +0100 |
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committer | Alexey Lebedeff <binarin@binarin.ru> | 2017-11-06 11:03:30 +0100 |
commit | 5ce0f5aa38477a5d7700bdb1f086c328d826f2b5 (patch) | |
tree | dfe659abe432415d3d89724450d2aefe6921555f /doc/package-notes.xml | |
parent | eece8755d1f5da1a5be319edf37c1a6244289010 (diff) |
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).
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 184bee089ae3..19b476597de8 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> |