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nixpkgs/pkgs/development/haskell-modules/hoogle.nix
Travis Whitaker f1e3a6961b Pass hoogle-local's buildCommand as a file.
This is necessary when a very large number of packages are included in the
package database. Without this change, setting up the build environment will
fail, since the environment will be too large.

This simply applies the technique mentioned in
https://github.com/NixOS/nixpkgs/issues/25057 to solve this problem.
2019-09-03 09:23:28 +02:00

126 lines
3.8 KiB
Nix

# Install not only the Hoogle library and executable, but also a local Hoogle
# database which provides "Source" links to all specified 'packages' -- or the
# current Haskell Platform if no custom package set is provided.
#
# It is intended to be used in config.nix similarly to:
#
# { packageOverrides = pkgs: rec {
#
# haskellPackages =
# let callPackage = pkgs.lib.callPackageWith haskellPackages;
# in pkgs.recurseIntoAttrs (pkgs.haskellPackages.override {
# extension = self: super: {
# hoogleLocal = pkgs.haskellPackages.hoogleLocal.override {
# packages = with pkgs.haskellPackages; [
# mmorph
# monadControl
# ];
# };
# };
# });
# }}
#
# This will build mmorph and monadControl, and have the hoogle installation
# refer to their documentation via symlink so they are not garbage collected.
{ lib, stdenv, hoogle, writeText, ghc
, packages
}:
let
wrapper = ./hoogle-local-wrapper.sh;
isGhcjs = ghc.isGhcjs or false;
opts = lib.optionalString;
haddockExe =
if !isGhcjs
then "haddock"
else "haddock-ghcjs";
ghcDocLibDir =
if !isGhcjs
then ghc.doc + ''/share/doc/ghc*/html/libraries''
else ghc + ''/doc/lib'';
# On GHCJS, use a stripped down version of GHC's prologue.txt
prologue =
if !isGhcjs
then "${ghcDocLibDir}/prologue.txt"
else writeText "ghcjs-prologue.txt" ''
This index includes documentation for many Haskell modules.
'';
# TODO: closePropagation is deprecated; replace
docPackages = lib.closePropagation
# we grab the doc outputs
(map (lib.getOutput "doc") packages);
in
stdenv.mkDerivation {
name = "hoogle-local-0.1";
buildInputs = [ghc hoogle];
inherit docPackages;
passAsFile = ["buildCommand"];
buildCommand = ''
${lib.optionalString (packages != [] -> docPackages == [])
("echo WARNING: localHoogle package list empty, even though"
+ " the following were specified: "
+ lib.concatMapStringsSep ", " (p: p.name) packages)}
mkdir -p $out/share/doc/hoogle
echo importing builtin packages
for docdir in ${ghcDocLibDir}"/"*; do
name="$(basename $docdir)"
${opts isGhcjs ''docdir="$docdir/html"''}
if [[ -d $docdir ]]; then
ln -sfn $docdir $out/share/doc/hoogle/$name
fi
done
echo importing other packages
${lib.concatMapStringsSep "\n" (el: ''
ln -sfn ${el.haddockDir} "$out/share/doc/hoogle/${el.name}"
'')
(lib.filter (el: el.haddockDir != null)
(builtins.map (p: { haddockDir = if p ? haddockDir then p.haddockDir p else null;
name = p.pname; })
docPackages))}
echo building hoogle database
hoogle generate --database $out/share/doc/hoogle/default.hoo --local=$out/share/doc/hoogle
echo building haddock index
# adapted from GHC's gen_contents_index
cd $out/share/doc/hoogle
args=
for hdfile in $(ls -1 *"/"*.haddock | grep -v '/ghc\.haddock' | sort); do
name_version=`echo "$hdfile" | sed 's#/.*##'`
args="$args --read-interface=$name_version,$hdfile"
done
${ghc}/bin/${haddockExe} --gen-index --gen-contents -o . \
-t "Haskell Hierarchical Libraries" \
-p ${prologue} \
$args
echo finishing up
mkdir -p $out/bin
substitute ${wrapper} $out/bin/hoogle \
--subst-var out --subst-var-by shell ${stdenv.shell} \
--subst-var-by hoogle ${hoogle}
chmod +x $out/bin/hoogle
'';
passthru = {
isHaskellLibrary = false; # for the filter in ./with-packages-wrapper.nix
};
meta = {
description = "A local Hoogle database";
platforms = ghc.meta.platforms;
hydraPlatforms = with stdenv.lib.platforms; none;
maintainers = with stdenv.lib.maintainers; [ ttuegel ];
};
}