Prepend hs-source-dir to match-component #6622

Cabal/doc/cabal-commands.rst

@@ -86,6 +86,12 @@ A target can take any of the following forms:
      - ``tests``,
      - ``benches``, ``benchmarks``.
 
+-  A module target: ``[package:][ctype:]module``, which specifies that the
+   component of which the given module is a part of will be built.
+
+-  A filepath target: ``[package:][ctype:]filepath``, which specifies that the
+   component of which the given filepath is a part of will be built.
+
 In component targets, ``package:`` and ``ctype:`` (valid component types
 are ``lib``, ``flib``, ``exe``, ``test`` and ``bench``) can be used to
 disambiguate when multiple packages define the same component, or the
@@ -99,9 +105,12 @@ Some example targets:
 
     $ cabal v2-build lib:foo-pkg       # build the library named foo-pkg
     $ cabal v2-build foo-pkg:foo-tests # build foo-tests in foo-pkg
-
-(There is also syntax for specifying module and file targets, but it
-doesn't currently do anything.)
+    $ cabal v2-build src/Lib.s         # build the library component to
+                                       # which "src/Lib.hs" belongs
+    $ cabal v2-build app/Main.hs       # build the executable component of
+                                       # "app/Main.hs"
+    $ cabal v2-build Lib               # build the library component to
+                                       # which the module "Lib" belongs
 
 Beyond a list of targets, ``cabal v2-build`` accepts all the flags that
 ``cabal v2-configure`` takes. Most of these flags are only taken into

cabal-install/Distribution/Client/TargetSelector.hs

@@ -2117,12 +2117,14 @@ matchComponentOtherFile :: [KnownComponent] -> String
                         -> Match (FilePath, KnownComponent)
 matchComponentOtherFile cs =
     matchFile
-      [ (file, c)
-      | c    <- cs
-      , file <- cinfoHsFiles c
-             ++ cinfoCFiles  c
-             ++ cinfoJsFiles c
+      [ (normalise (srcdir </> file), c)
+      | c      <- cs
+      , srcdir <- cinfoSrcDirs c
+      , file   <- cinfoHsFiles c
+               ++ cinfoCFiles  c
+               ++ cinfoJsFiles c
       ]
+      . normalise
 
 
 matchComponentModuleFile :: [KnownComponent] -> String

cabal-install/cabal-install.cabal

@@ -80,8 +80,10 @@ Extra-Source-Files:
   tests/IntegrationTests2/targets/multiple-tests/cabal.project
   tests/IntegrationTests2/targets/multiple-tests/p.cabal
   tests/IntegrationTests2/targets/simple/P.hs
+  tests/IntegrationTests2/targets/simple/app/Main.hs
   tests/IntegrationTests2/targets/simple/cabal.project
   tests/IntegrationTests2/targets/simple/p.cabal
+  tests/IntegrationTests2/targets/simple/q/Q.hs
   tests/IntegrationTests2/targets/simple/q/QQ.hs
   tests/IntegrationTests2/targets/simple/q/q.cabal
   tests/IntegrationTests2/targets/test-only/p.cabal

cabal-install/cabal-install.cabal.pp

@@ -360,8 +360,10 @@
   tests/IntegrationTests2/targets/multiple-tests/cabal.project
   tests/IntegrationTests2/targets/multiple-tests/p.cabal
   tests/IntegrationTests2/targets/simple/P.hs
+  tests/IntegrationTests2/targets/simple/app/Main.hs
   tests/IntegrationTests2/targets/simple/cabal.project
   tests/IntegrationTests2/targets/simple/p.cabal
+  tests/IntegrationTests2/targets/simple/q/Q.hs
   tests/IntegrationTests2/targets/simple/q/QQ.hs
   tests/IntegrationTests2/targets/simple/q/q.cabal
   tests/IntegrationTests2/targets/test-only/p.cabal

cabal-install/tests/IntegrationTests2.hs

@@ -247,9 +247,15 @@ testTargetSelectors reportSubCase = do
                                  ":pkg:p:lib:p:file:P.y"
                      , "q/QQ.hs", "q:QQ.lhs", "lib:q:QQ.hsc", "q:q:QQ.hsc",
                                   ":pkg:q:lib:q:file:QQ.y"
+                     , "q/Q.hs", "q:Q.lhs", "lib:q:Q.hsc", "q:q:Q.hsc",
+                                  ":pkg:q:lib:q:file:Q.y"
+                     , "app/Main.hs", "p:app/Main.hs", "exe:ppexe:app/Main.hs", "p:ppexe:app/Main.hs",
+                                  ":pkg:p:exe:ppexe:file:app/Main.hs"
                      ]
        ts @?= replicate 5 (TargetComponent "p-0.1" (CLibName LMainLibName) (FileTarget "P"))
            ++ replicate 5 (TargetComponent "q-0.1" (CLibName LMainLibName) (FileTarget "QQ"))
+           ++ replicate 5 (TargetComponent "q-0.1" (CLibName LMainLibName) (FileTarget "Q"))
+           ++ replicate 5 (TargetComponent "p-0.1" (CExeName "ppexe") (FileTarget ("app" </> "Main.hs")))
        -- Note there's a bit of an inconsistency here: for the single-part
        -- syntax the target has to point to a file that exists, whereas for
        -- all the other forms we don't require that.
@@ -355,6 +361,16 @@ testTargetSelectorAmbiguous reportSubCase = do
                       , mkexe "other2" `withCFiles`  ["Foo"] ]
       ]
 
+    -- File target is ambiguous, part of multiple components
+    reportSubCase "ambiguous: file in multiple comps"
+    assertAmbiguous "Bar.hs"
+      [ mkTargetFile "foo" (CExeName "bar")  "Bar"
+      , mkTargetFile "foo" (CExeName "bar2") "Bar"
+      ]
+      [ mkpkg "foo" [ mkexe "bar"  `withModules` ["Bar"]
+                    , mkexe "bar2" `withModules` ["Bar"] ]
+      ]
+
     -- non-exact case packages and components are ambiguous
     reportSubCase "ambiguous: non-exact-case pkg names"
     assertAmbiguous "Foo"
@@ -1330,7 +1346,7 @@ testExceptionInConfigureStep config = do
     (_pkga1, failure) <- expectPackageFailed plan res pkgidA1
     case buildFailureReason failure of
       ConfigureFailed _ -> return ()
-      _ -> assertFailure $ "expected ConfigureFailed, got " ++ show failure 
+      _ -> assertFailure $ "expected ConfigureFailed, got " ++ show failure
     cleanProject testdir
   where
     testdir = "exception/configure"

cabal-install/tests/IntegrationTests2/targets/simple/p.cabal

@@ -10,3 +10,8 @@ library
 executable pexe
   main-is: Main.hs
   other-modules: PMain
+
+executable ppexe
+  main-is: Main.hs
+  hs-source-dirs: app
+  other-modules: PMain

cabal-install/tests/IntegrationTests2/targets/simple/q/q.cabal

@@ -5,6 +5,7 @@ cabal-version: >= 1.2
 
 library
   exposed-modules: QQ
+  other-modules: Q
   build-depends: base
 
 executable qexe