Adds a new 'inline-tests' setting in env stanza

CHANGES.md

@@ -104,6 +104,10 @@
 - Do not warn about merlin files pre 1.9. This warning can only be disabled in
   1.9 (#2421, fixes #2399, @emillon)
 
+- Add a new `inline_tests` field in the env stanza to control inline_tests
+  framework with a variable (#2313, @mlasson, original idea by @diml, review
+  by @rgrinberg).
+
 1.10.0 (04/06/2019)
 -------------------
 

doc/dune-files.rst

@@ -814,6 +814,12 @@ Fields supported in ``<settings>`` are:
   be inferred from the basename of ``<filepath>`` by dropping the ``.exe``
   suffix if it exists.
 
+- ``(inline_tests <state>)`` where state is either ``enabled``, ``disabled`` or
+  ``ignored``. This field is available since Dune 1.11. It controls the value
+  of the variable ``%{inline_tests}`` that is read by the inline test framework.
+  The default value is ``disabled`` for the ``release`` profile and ``enabled``
+  otherwise.
+
 .. _dune-subdirs:
 
 dirs (since 1.6)

src/dune_env.ml

@@ -14,11 +14,31 @@ module Stanza = struct
     in
     C.Kind.Dict.make ~c ~cxx
 
+  module Inline_tests = struct
+    type t =
+      | Enabled
+      | Disabled
+      | Ignored
+
+    let decode =
+      enum
+        [ "enabled", Enabled
+        ; "disabled", Disabled
+        ; "ignored", Ignored ]
+
+    let to_string = function
+      | Enabled -> "enabled"
+      | Disabled -> "disabled"
+      | Ignored -> "ignored"
+
+  end
+
   type config =
     { flags          : Ocaml_flags.Spec.t
     ; c_flags        : Ordered_set_lang.Unexpanded.t C.Kind.Dict.t
     ; env_vars       : Env.t
     ; binaries       : File_binding.Unexpanded.t list
+    ; inline_tests   : Inline_tests.t option
     }
 
   type pattern =
@@ -30,6 +50,12 @@ module Stanza = struct
     ; rules : (pattern * config) list
     }
 
+  let inline_tests_field =
+    field_o
+    "inline_tests"
+      (Syntax.since Stanza.syntax (1, 11) >>>
+      Inline_tests.decode)
+
   let env_vars_field =
     field
     "env-vars"
@@ -49,11 +75,13 @@ module Stanza = struct
     and+ binaries = field ~default:[] "binaries"
                       (Syntax.since Stanza.syntax (1, 6)
                        >>> File_binding.Unexpanded.L.decode)
+    and+ inline_tests = inline_tests_field
     in
     { flags
     ; c_flags
     ; env_vars
     ; binaries
+    ; inline_tests
     }
 
   let rule =

src/dune_env.mli

@@ -3,11 +3,22 @@ open! Stdune
 type stanza = Stanza.t = ..
 
 module Stanza : sig
+
+  module Inline_tests: sig
+    type t =
+      | Enabled
+      | Disabled
+      | Ignored
+    val decode: t Dune_lang.Decoder.t
+    val to_string: t -> string
+  end
+
   type config =
     { flags          : Ocaml_flags.Spec.t
     ; c_flags        : Ordered_set_lang.Unexpanded.t C.Kind.Dict.t
     ; env_vars       : Env.t
     ; binaries       : File_binding.Unexpanded.t list
+    ; inline_tests   : Inline_tests.t option
     }
 
   type pattern =

src/env_node.ml

@@ -9,7 +9,8 @@ type t =
   ; mutable ocaml_flags   : Ocaml_flags.t option
   ; mutable c_flags       : (unit, string list) Build.t C.Kind.Dict.t option
   ; mutable external_     : Env.t option
-  ; mutable bin_artifacts     : Artifacts.Bin.t option
+  ; mutable bin_artifacts : Artifacts.Bin.t option
+  ; mutable inline_tests  : Dune_env.Stanza.Inline_tests.t option;
   }
 
 let scope t = t.scope
@@ -24,6 +25,7 @@ let make ~dir ~inherit_from ~scope ~config =
   ; external_ = None
   ; bin_artifacts = None
   ; local_binaries = None
+  ; inline_tests = None
   }
 
 let find_config t ~profile =
@@ -123,6 +125,26 @@ let rec ocaml_flags t ~profile ~expander =
     t.ocaml_flags <- Some flags;
     flags
 
+let rec inline_tests t ~profile =
+  match t.inline_tests with
+  | Some x -> x
+  | None ->
+    let state : Dune_env.Stanza.Inline_tests.t =
+      match find_config t ~profile with
+      | None | Some {inline_tests = None; _} ->
+        begin match t.inherit_from with
+        | None ->
+          if profile = "release" then
+            Disabled
+          else
+            Enabled
+        | Some (lazy t) -> inline_tests t ~profile
+        end
+      | Some {inline_tests = Some s; _} -> s
+    in
+    t.inline_tests <- Some state;
+    state
+
 let rec c_flags t ~profile ~expander ~default_context_flags =
   match t.c_flags with
   | Some x -> x

src/env_node.mli

@@ -18,6 +18,8 @@ val external_ : t -> profile:string -> default:Env.t -> Env.t
 
 val ocaml_flags : t -> profile:string -> expander:Expander.t -> Ocaml_flags.t
 
+val inline_tests : t -> profile:string -> Dune_env.Stanza.Inline_tests.t
+
 val c_flags
   : t
   -> profile:string

src/super_context.ml

@@ -153,6 +153,10 @@ end = struct
     in
     Env_node.local_binaries node ~profile:t.profile ~expander
 
+  let inline_tests ({profile; _} as t) ~dir =
+    let node = get t ~dir in
+    Env_node.inline_tests node ~profile
+
   let bin_artifacts t ~dir =
     let expander =
       expander_for_artifacts t ~context_expander:t.expander ~dir
@@ -177,7 +181,16 @@ end = struct
       expander_for_artifacts t ~context_expander:t.expander ~dir
     in
     let bin_artifacts_host = bin_artifacts_host t ~dir in
-    Expander.set_bin_artifacts expander ~bin_artifacts_host
+    let bindings =
+      let str =
+        inline_tests t ~dir
+        |> Dune_env.Stanza.Inline_tests.to_string
+      in
+      Pform.Map.singleton "inline_tests" (Values [String str])
+    in
+    expander
+    |> Expander.add_bindings ~bindings
+    |> Expander.set_bin_artifacts ~bin_artifacts_host
 
   let ocaml_flags t ~dir =
     Env_node.ocaml_flags (get t ~dir)

test/blackbox-tests/test-cases/inline_tests/dune-project

@@ -1 +1 @@
-(lang dune 1.0)
+(lang dune 1.11)

test/blackbox-tests/test-cases/inline_tests/run.t

@@ -1,7 +1,20 @@
   $ env -u OCAMLRUNPARAM dune runtest simple
            run alias simple/runtest (exit 2)
   (cd _build/default/simple && .foo_simple.inline-tests/run.exe)
-  Fatal error: exception File "simple/.foo_simple.inline-tests/run.ml-gen", line 1, characters 10-16: Assertion failed
+  Fatal error: exception File "simple/.foo_simple.inline-tests/run.ml-gen", line 1, characters 40-46: Assertion failed
+  [1]
+
+The expected behavior for the following three tests is to output nothing: the tests are disabled or ignored. 
+  $ env -u OCAMLRUNPARAM dune runtest simple --profile release
+
+  $ env -u OCAMLRUNPARAM dune runtest simple --profile disable-inline-tests
+
+  $ env -u OCAMLRUNPARAM dune runtest simple --profile ignore-inline-tests
+
+  $ env -u OCAMLRUNPARAM dune runtest simple --profile enable-inline-tests
+           run alias simple/runtest (exit 2)
+  (cd _build/default/simple && .foo_simple.inline-tests/run.exe)
+  Fatal error: exception File "simple/.foo_simple.inline-tests/run.ml-gen", line 1, characters 40-46: Assertion failed
   [1]
 
   $ dune runtest missing-backend

test/blackbox-tests/test-cases/inline_tests/simple/dune

@@ -2,9 +2,13 @@
  (name backend_simple)
  (modules ())
  (inline_tests.backend
-  (generate_runner (run sed "s/(\\*TEST:\\(.*\\)\\*)/let () = \\1;;/" %{impl-files})
+  (generate_runner (run sed "s/(\\*TEST:\\(.*\\)\\*)/let () = if \"%{inline_tests}\" = \"enabled\" then \\1;;/" %{impl-files})
   )))
 
 (library
  (name foo_simple)
  (inline_tests (backend backend_simple)))
+
+(env (ignore-inline-tests (inline_tests ignored))
+     (enable-inline-tests (inline_tests enabled))
+     (disable-inline-tests (inline_tests disabled)))