Build Haddocks with source hyperlinks unless doHscolour is false

pkgs/build-support/cabal/default.nix

@@ -1,12 +1,13 @@
 # generic builder for Cabal packages
 
 { stdenv, fetchurl, lib, pkgconfig, ghc, Cabal, jailbreakCabal, glibcLocales
-, gnugrep, coreutils
+, gnugrep, coreutils, hscolour
 , enableLibraryProfiling ? false
 , enableSharedLibraries ? false
 , enableSharedExecutables ? false
 , enableStaticLibraries ? true
 , enableCheckPhase ? stdenv.lib.versionOlder "7.4" ghc.version
+, enableHyperlinkSource ? true
 , extension ? (self : super : {})
 }:
 
@@ -50,6 +51,7 @@ assert !enableStaticLibraries -> versionOlder "7.7" ghc.version;
                 propagatedBuildInputs = filter (y : ! (y == null)) x.propagatedBuildInputs;
                 propagatedUserEnvPkgs = filter (y : ! (y == null)) x.propagatedUserEnvPkgs;
                 doCheck               = enableCheckPhase && x.doCheck;
+                hyperlinkSource       = enableHyperlinkSource && x.hyperlinkSource;
               };
 
         defaults =
@@ -92,6 +94,7 @@ assert !enableStaticLibraries -> versionOlder "7.7" ghc.version;
             buildInputs = [ghc Cabal] ++ self.extraBuildInputs;
             extraBuildInputs = self.buildTools ++
                                (optionals self.doCheck self.testDepends) ++
+                               (optional self.hyperlinkSource hscolour) ++
                                (if self.pkgconfigDepends == [] then [] else [pkgconfig]) ++
                                (if self.isLibrary then [] else self.buildDepends ++ self.extraLibraries ++ self.pkgconfigDepends);
 
@@ -140,6 +143,9 @@ assert !enableStaticLibraries -> versionOlder "7.7" ghc.version;
             # and run any regression test suites the package might have
             doCheck = enableCheckPhase;
 
+            # pass the '--hyperlink-source' flag to ./Setup haddock
+            hyperlinkSource = enableHyperlinkSource;
+
             # abort the build if the configure phase detects that the package
             # depends on multiple versions of the same build input
             strictConfigurePhase = true;
@@ -219,7 +225,8 @@ assert !enableStaticLibraries -> versionOlder "7.7" ghc.version;
               ./Setup build ${self.buildTarget}
 
               export GHC_PACKAGE_PATH=$(${ghc.GHCPackages})
-              test -n "$noHaddock" || ./Setup haddock --html --hoogle
+              test -n "$noHaddock" || ./Setup haddock --html --hoogle \
+                  ${optionalString self.hyperlinkSource "--hyperlink-source"}
 
               eval "$postBuild"
             '';

pkgs/development/libraries/haskell/unlambda/default.nix

@@ -7,6 +7,7 @@ cabal.mkDerivation (self: {
   isLibrary = true;
   isExecutable = true;
   buildDepends = [ mtl ];
+  hyperlinkSource = false;
   meta = {
     description = "Unlambda interpreter";
     license = "GPL";

pkgs/development/tools/haskell/hscolour/default.nix

@@ -1,4 +1,4 @@
-{ cabal }:
+{ cabal, hyperlinkSource ? true }:
 
 cabal.mkDerivation (self: {
   pname = "hscolour";
@@ -6,6 +6,7 @@ cabal.mkDerivation (self: {
   sha256 = "15ix93sw4p7g5ln2halcgqppdc0i0vmkzcjzxvqzkk9yp9pq3nrs";
   isLibrary = true;
   isExecutable = true;
+  hyperlinkSource = hyperlinkSource;
   meta = {
     homepage = "http://code.haskell.org/~malcolm/hscolour/";
     description = "Colourise Haskell code";

pkgs/top-level/haskell-packages.nix

@@ -96,6 +96,7 @@ self : let callPackage = x : y : modifyPrio (newScope self x y); in
 
   cabal = callPackage ../build-support/cabal {
     Cabal = null;               # prefer the Cabal version shipped with the compiler
+    hscolour = self.hscolourBootstrap;
     inherit enableLibraryProfiling enableCheckPhase
       enableStaticLibraries enableSharedLibraries enableSharedExecutables;
     glibcLocales = if pkgs.stdenv.isLinux then pkgs.glibcLocales else null;
@@ -1117,8 +1118,6 @@ self : let callPackage = x : y : modifyPrio (newScope self x y); in
 
   hsBibutils = callPackage ../development/libraries/haskell/hs-bibutils {};
 
-  hscolour = callPackage ../development/libraries/haskell/hscolour {};
-
   hsdns = callPackage ../development/libraries/haskell/hsdns {};
 
   hsemail = if (pkgs.stdenv.lib.versionOlder ghc.version "7") then null else
@@ -2605,6 +2604,9 @@ self : let callPackage = x : y : modifyPrio (newScope self x y); in
 
   hlint = callPackage ../development/tools/haskell/hlint {};
 
+  hscolour = callPackage ../development/tools/haskell/hscolour {};
+  hscolourBootstrap = self.hscolour.override { hyperlinkSource = false; };
+
   hslogger = callPackage ../development/tools/haskell/hslogger {};
 
   tar = callPackage ../development/libraries/haskell/tar {};