cabal haddock imply enable-documentation

cabal-install/src/Distribution/Client/CmdHaddock.hs

@@ -24,7 +24,7 @@ import Distribution.Client.TargetProblem
 import Distribution.Client.NixStyleOptions
          ( NixStyleFlags (..), nixStyleOptions, defaultNixStyleFlags )
 import Distribution.Client.Setup
-         ( GlobalFlags, ConfigFlags(..) )
+         ( GlobalFlags, ConfigFlags(..), InstallFlags (..))
 import Distribution.Simple.Setup
          ( HaddockFlags(..), fromFlagOrDefault, trueArg )
 import Distribution.Simple.Command
@@ -141,7 +141,8 @@ haddockAction flags@NixStyleFlags {..} targetStrings globalFlags = do
     runProjectPostBuildPhase verbosity baseCtx buildCtx' buildOutcomes
   where
     verbosity = fromFlagOrDefault normal (configVerbosity configFlags)
-    cliConfig = commandLineFlagsToProjectConfig globalFlags flags mempty -- ClientInstallFlags, not needed here
+    flags' = flags { installFlags = installFlags { installDocumentation = Flag True } }
+    cliConfig = commandLineFlagsToProjectConfig globalFlags flags' mempty -- ClientInstallFlags, not needed here
 
 -- | This defines what a 'TargetSelector' means for the @haddock@ command.
 -- It selects the 'AvailableTarget's that the 'TargetSelector' refers to,

cabal-testsuite/PackageTests/NewHaddock/ImplyDependencies/Lib.hs

@@ -0,0 +1,8 @@
+module Lib where
+
+import Text.PrettyPrint (render, text)
+
+-- | Rendering using 'text' and 'render'
+myLibFunc :: IO ()
+myLibFunc = do
+    putStrLn (render (text "foo"))

cabal-testsuite/PackageTests/NewHaddock/ImplyDependencies/cabal.out

@@ -0,0 +1,9 @@
+# cabal haddock
+Resolving dependencies...
+Build profile: -w ghc-<GHCVER> -O1
+In order, the following will be built:
+ - test-1.0 (lib) (first run)
+Configuring library for test-1.0..
+Preprocessing library for test-1.0..
+Running Haddock on library for test-1.0..
+Documentation created: <ROOT>/cabal.dist/work/dist/build/<ARCH>/ghc-<GHCVER>/test-1.0/doc/html/test/index.html

cabal-testsuite/PackageTests/NewHaddock/ImplyDependencies/cabal.project

@@ -0,0 +1 @@
+packages: .

cabal-testsuite/PackageTests/NewHaddock/ImplyDependencies/cabal.test.hs

@@ -0,0 +1,5 @@
+import Test.Cabal.Prelude
+-- Test that `cabal haddock` doesn't require explicit
+-- `--enable-dependencies` to happily process links to external packages
+main = cabalTest $
+    cabal "haddock" ["lib"]

cabal-testsuite/PackageTests/NewHaddock/ImplyDependencies/pkg.cabal

@@ -0,0 +1,15 @@
+name: test
+version: 1.0
+cabal-version: >= 1.10
+author: Artem Pelenitsyn
+category: PackageTests
+build-type: Simple
+
+description:
+    Check that `cabal haddock` implies `--enable-dependencies`
+---------------------------------------
+
+Library
+    exposed-modules: Lib
+    build-depends: base, pretty
+    default-language: Haskell2010