feat(third_party/bazel): Check in rules_haskell from Tweag r/17

11 files changed, 454 insertions, 0 deletions

diff --git a/third_party/bazel/rules_haskell/tools/runfiles/BUILD.bazel b/third_party/bazel/rules_haskell/tools/runfiles/BUILD.bazel
new file mode 100644
index 000000000000..bc99b96c037a
--- /dev/null
+++ b/third_party/bazel/rules_haskell/tools/runfiles/BUILD.bazel
@@ -0,0 +1,46 @@
+load(
+    "@io_tweag_rules_haskell//haskell:haskell.bzl",
+    "haskell_library",
+    "haskell_test",
+)
+
+haskell_library(
+    name = "runfiles",
+    srcs = ["src/Bazel/Runfiles.hs"],
+    src_strip_prefix = "src",
+    visibility = ["//visibility:public"],
+    deps = [
+        "@hackage//:base",
+        "@hackage//:directory",
+        "@hackage//:filepath",
+    ],
+)
+
+haskell_test(
+    name = "bin",
+    testonly = 1,
+    srcs = ["bin/Bin.hs"],
+    data = ["bin-data.txt"],
+    src_strip_prefix = "bin",
+    deps = [
+        ":runfiles",
+        "@hackage//:base",
+        "@hackage//:filepath",
+    ],
+)
+
+haskell_test(
+    name = "test",
+    srcs = ["test/Test.hs"],
+    data = [
+        "test-data.txt",
+        ":bin",
+    ],
+    src_strip_prefix = "test",
+    deps = [
+        ":runfiles",
+        "@hackage//:base",
+        "@hackage//:filepath",
+        "@hackage//:process",
+    ],
+)
diff --git a/third_party/bazel/rules_haskell/tools/runfiles/LICENSE b/third_party/bazel/rules_haskell/tools/runfiles/LICENSE
new file mode 100644
index 000000000000..261eeb9e9f8b
--- /dev/null
+++ b/third_party/bazel/rules_haskell/tools/runfiles/LICENSE
@@ -0,0 +1,201 @@
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diff --git a/third_party/bazel/rules_haskell/tools/runfiles/README.md b/third_party/bazel/rules_haskell/tools/runfiles/README.md
new file mode 100644
index 000000000000..9e95713179af
--- /dev/null
+++ b/third_party/bazel/rules_haskell/tools/runfiles/README.md
@@ -0,0 +1,19 @@
+# Bazel Runfiles
+
+This is a small utility to enable discovery of the Bazel runfiles location. This is useful in tests for example.
+
+```haskell
+module Main (main) where
+
+import qualified Bazel.Runfiles as Runfiles
+import Control.Monad (when)
+import System.Process (callProcess)
+
+main :: IO ()
+main = do
+    r <- Runfiles.create
+    foo <- readFile (Runfiles.rlocation r "io_tweag_rules_haskell/tools/runfiles/test-data.txt")
+    when (lines foo /= ["foo"]) -- ignore trailing newline
+        $ error $ "Incorrect contents: got: " ++ show foo
+    callProcess (Runfiles.rlocation r "io_tweag_rules_haskell/tools/runfiles/bin") []
+```
diff --git a/third_party/bazel/rules_haskell/tools/runfiles/bazel-runfiles.cabal b/third_party/bazel/rules_haskell/tools/runfiles/bazel-runfiles.cabal
new file mode 100644
index 000000000000..edfc7b6e00b9
--- /dev/null
+++ b/third_party/bazel/rules_haskell/tools/runfiles/bazel-runfiles.cabal
@@ -0,0 +1,53 @@
+-- This file has been generated from package.yaml by hpack version 0.28.2.
+--
+-- see: https://github.com/sol/hpack
+--
+-- hash: bd1c2ce5b0ffa0157650e1c2409d31b818889736ef09aaf51de71e54d9a7d3fc
+
+name:           bazel-runfiles
+version:        0.7.0.1
+synopsis:       Locate Bazel runfiles location
+description:    Please see the README on GitHub at <https://github.com/tweag/rules_haskell/blob/master/tools/runfiles/README.md>
+category:       Build Tool
+homepage:       https://github.com/tweag/rules_haskell#readme
+bug-reports:    https://github.com/tweag/rules_haskell/issues
+author:         Tweag I/O Limited
+maintainer:     m@tweag.io
+copyright:      2018 Tweag I/O Limited
+license:        Apache-2.0
+license-file:   LICENSE
+build-type:     Simple
+cabal-version:  >= 1.10
+extra-source-files:
+    LICENSE
+    README.md
+
+source-repository head
+  type: git
+  location: https://github.com/tweag/rules_haskell
+
+library
+  exposed-modules:
+      Bazel.Runfiles
+  other-modules:
+      Paths_bazel_runfiles
+  hs-source-dirs:
+      src
+  build-depends:
+      base >=4.7 && <5
+    , directory
+    , filepath
+  default-language: Haskell2010
+
+executable bazel-runfiles-exe
+  main-is: Bin.hs
+  other-modules:
+      Paths_bazel_runfiles
+  hs-source-dirs:
+      bin
+  ghc-options: -threaded -rtsopts -with-rtsopts=-N
+  build-depends:
+      base
+    , bazel-runfiles
+    , filepath
+  default-language: Haskell2010
diff --git a/third_party/bazel/rules_haskell/tools/runfiles/bin-data.txt b/third_party/bazel/rules_haskell/tools/runfiles/bin-data.txt
new file mode 100644
index 000000000000..5716ca5987cb
--- /dev/null
+++ b/third_party/bazel/rules_haskell/tools/runfiles/bin-data.txt
@@ -0,0 +1 @@
+bar
diff --git a/third_party/bazel/rules_haskell/tools/runfiles/bin/Bin.hs b/third_party/bazel/rules_haskell/tools/runfiles/bin/Bin.hs
new file mode 100644
index 000000000000..5bc90c70bc01
--- /dev/null
+++ b/third_party/bazel/rules_haskell/tools/runfiles/bin/Bin.hs
@@ -0,0 +1,12 @@
+module Main (main) where
+
+import qualified Bazel.Runfiles as Runfiles
+import Control.Monad (when)
+import System.FilePath ((</>))
+
+main :: IO ()
+main = do
+    r <- Runfiles.create
+    bar <- readFile (Runfiles.rlocation r "io_tweag_rules_haskell/tools/runfiles/bin-data.txt")
+    when (lines bar /= ["bar"]) -- ignore trailing newline
+        $ error $ "Incorrect contents: got: " ++ show bar
diff --git a/third_party/bazel/rules_haskell/tools/runfiles/package.yaml b/third_party/bazel/rules_haskell/tools/runfiles/package.yaml
new file mode 100644
index 000000000000..fb6d3081a6b4
--- /dev/null
+++ b/third_party/bazel/rules_haskell/tools/runfiles/package.yaml
@@ -0,0 +1,43 @@
+name:                bazel-runfiles
+version:             0.7.0.1
+github:              "tweag/rules_haskell"
+license:             Apache-2.0
+author:              "Tweag I/O Limited"
+maintainer:          "m@tweag.io"
+copyright:           "2018 Tweag I/O Limited"
+
+extra-source-files:
+- README.md
+- LICENSE
+
+synopsis:            Locate Bazel runfiles location
+category:            Build Tool
+
+# To avoid duplicated efforts in documentation and dealing with the
+# complications of embedding Haddock markup inside cabal files, it is
+# common to point users to the README.md file.
+description:         Please see the README on GitHub at <https://github.com/tweag/rules_haskell/blob/master/tools/runfiles/README.md>
+
+dependencies:
+- base >= 4.7 && < 5
+
+library:
+  source-dirs: src
+  dependencies:
+  - directory
+  - filepath
+  exposed-modules:
+  - Bazel.Runfiles
+
+executables:
+  bazel-runfiles-exe:
+    main:                Bin.hs
+    source-dirs:         bin
+    ghc-options:
+    - -threaded
+    - -rtsopts
+    - -with-rtsopts=-N
+    dependencies:
+    - base
+    - bazel-runfiles
+    - filepath
diff --git a/third_party/bazel/rules_haskell/tools/runfiles/src/Bazel/Runfiles.hs b/third_party/bazel/rules_haskell/tools/runfiles/src/Bazel/Runfiles.hs
new file mode 100644
index 000000000000..8dfb980e1801
--- /dev/null
+++ b/third_party/bazel/rules_haskell/tools/runfiles/src/Bazel/Runfiles.hs
@@ -0,0 +1,62 @@
+-- | This module enables finding data dependencies ("runfiles") of Haskell
+-- binaries at runtime.
+--
+-- For more information, see: https://github.com/bazelbuild/bazel/issues/4460
+--
+-- Note: this does not currently support the RUNFILES_MANIFEST environmental
+-- variable.  However, that's only necessary on Windows, which rules_haskell
+-- doesn't support yet.
+--
+-- Additionally, this is not yet supported by the REPL.
+module Bazel.Runfiles
+    ( Runfiles
+    , create
+    , rlocation
+    , env
+    ) where
+
+import System.Directory (doesDirectoryExist)
+import System.Environment (getExecutablePath, lookupEnv)
+import System.FilePath (FilePath, (</>), (<.>))
+
+-- | A path to a directory tree containing runfiles for the given
+newtype Runfiles = Runfiles FilePath
+    deriving Show
+
+-- | Construct a path to a data dependency within the given runfiles.
+--
+-- For example: @rlocation \"myworkspace/mypackage/myfile.txt\"@
+rlocation :: Runfiles -> FilePath -> FilePath
+rlocation (Runfiles f) g = f </> g
+
+-- | Set environmental variables for locating the given runfiles directory.
+--
+-- Note that Bazel will set these automatically when it runs tests
+-- (@bazel test@).  However, it will not automatically set them
+-- during "bazel run"; thus, non-test binaries should set the
+-- environment manually for processes that they call.
+env :: Runfiles -> [(String, String)]
+env (Runfiles f) = [(runfilesDirEnv, f)]
+
+runfilesDirEnv :: String
+runfilesDirEnv = "RUNFILES_DIR"
+
+-- | Locate the runfiles directory for the current binary.
+--
+-- This behaves according to the specification in:
+-- https://docs.google.com/document/d/e/2PACX-1vSDIrFnFvEYhKsCMdGdD40wZRBX3m3aZ5HhVj4CtHPmiXKDCxioTUbYsDydjKtFDAzER5eg7OjJWs3V/pub
+--
+-- Note: it does not currently support the @RUNFILES_MANIFEST@ environmental
+-- variable.  However, that's only necessary on Windows, which rules_haskell
+-- doesn't support yet anyway.
+create :: IO Runfiles
+create = do
+    exeRunfilesPath <- fmap (<.> "runfiles") getExecutablePath
+    exeRunfilesExists <- doesDirectoryExist exeRunfilesPath
+    if exeRunfilesExists
+      then return $ Runfiles exeRunfilesPath
+      else do
+        envDir <- lookupEnv runfilesDirEnv
+        case envDir of
+            Just f -> return $ Runfiles f
+            Nothing -> error "Unable to locate runfiles directory"
diff --git a/third_party/bazel/rules_haskell/tools/runfiles/stack.yaml b/third_party/bazel/rules_haskell/tools/runfiles/stack.yaml
new file mode 100644
index 000000000000..03da81a5531e
--- /dev/null
+++ b/third_party/bazel/rules_haskell/tools/runfiles/stack.yaml
@@ -0,0 +1,3 @@
+resolver: lts-12.16
+packages:
+- .
diff --git a/third_party/bazel/rules_haskell/tools/runfiles/test-data.txt b/third_party/bazel/rules_haskell/tools/runfiles/test-data.txt
new file mode 100644
index 000000000000..257cc5642cb1
--- /dev/null
+++ b/third_party/bazel/rules_haskell/tools/runfiles/test-data.txt
@@ -0,0 +1 @@
+foo
diff --git a/third_party/bazel/rules_haskell/tools/runfiles/test/Test.hs b/third_party/bazel/rules_haskell/tools/runfiles/test/Test.hs
new file mode 100644
index 000000000000..3ef3b28df514
--- /dev/null
+++ b/third_party/bazel/rules_haskell/tools/runfiles/test/Test.hs
@@ -0,0 +1,13 @@
+module Main (main) where
+
+import qualified Bazel.Runfiles as Runfiles
+import Control.Monad (when)
+import System.Process (callProcess)
+
+main :: IO ()
+main = do
+    r <- Runfiles.create
+    foo <- readFile (Runfiles.rlocation r "io_tweag_rules_haskell/tools/runfiles/test-data.txt")
+    when (lines foo /= ["foo"]) -- ignore trailing newline
+        $ error $ "Incorrect contents: got: " ++ show foo
+    callProcess (Runfiles.rlocation r "io_tweag_rules_haskell/tools/runfiles/bin") []