import: hackage: Emit native-inputs in the importer.

* guix/import/cabal.scm (cabal-custom-setup-dependencies): Export.
(cabal-package-custom-setup): Export.
(<cabal-package>): New field "custom-setup".
(make-cabal-package): Modify.
(eval-cabal): Modify.
* guix/import/hackage.scm (cabal-dependencies->names): Factor out...
(cabal-test-dependencies->names): ...this.
(cabal-custom-setup-dependencies->names): New procedure.
(hackage-module->sexp): Modify.

guix/import/cabal.scm

@@ -34,6 +34,8 @@
   #:export (read-cabal
             eval-cabal
             
+            cabal-custom-setup-dependencies
+
             cabal-package?
             cabal-package-name
             cabal-package-version
@@ -47,6 +49,7 @@
             cabal-package-test-suites
             cabal-package-flags
             cabal-package-eval-environment
+            cabal-package-custom-setup
 
             cabal-source-repository?
             cabal-source-repository-use-case
@@ -616,7 +619,7 @@ If #f use the function 'port-filename' to obtain it."
   (make-cabal-package name version license home-page source-repository
                       synopsis description
                       executables lib test-suites
-                      flags eval-environment)
+                      flags eval-environment custom-setup)
   cabal-package?
   (name   cabal-package-name)
   (version cabal-package-version)
@@ -629,7 +632,8 @@ If #f use the function 'port-filename' to obtain it."
   (lib cabal-package-library) ; 'library' is a Scheme keyword
   (test-suites cabal-package-test-suites)
   (flags cabal-package-flags)
-  (eval-environment cabal-package-eval-environment)) ; alist
+  (eval-environment cabal-package-eval-environment) ; alist
+  (custom-setup cabal-package-custom-setup))
 
 (set-record-type-printer! <cabal-package>
                           (lambda (package port)
@@ -826,10 +830,13 @@ See the manual for limitations.")))))))
            (lib (make-cabal-section evaluated-sexp 'library))
            (test-suites (make-cabal-section evaluated-sexp 'test-suite))
            (flags (make-cabal-section evaluated-sexp 'flag))
-           (eval-environment '()))
+           (eval-environment '())
+           (custom-setup (match
+                          (make-cabal-section evaluated-sexp 'custom-setup)
+                          ((x) x))))
       (make-cabal-package name version license home-page-or-hackage
                           source-repository synopsis description executables lib
-                          test-suites flags eval-environment)))
+                          test-suites flags eval-environment custom-setup)))
 
   ((compose cabal-evaluated-sexp->package eval) cabal-sexp))
 

guix/import/hackage.scm

@@ -150,10 +150,9 @@ version."
    (_ #f)))
 
 
-(define (cabal-dependencies->names cabal include-test-dependencies?)
+(define (cabal-dependencies->names cabal)
-  "Return the list of dependencies names from the CABAL package object.  If
+  "Return the list of dependencies names from the CABAL package object,
-INCLUDE-TEST-DEPENDENCIES? is #f, do not include dependencies required by test
+not including test suite dependencies or custom-setup dependencies."
-suites."
   (let* ((lib (cabal-package-library cabal))
          (lib-deps (if (pair? lib)
                        (map cabal-dependency-name
@@ -163,15 +162,25 @@ suites."
          (exe-deps (if (pair? exe)
                        (map cabal-dependency-name
                             (append-map cabal-executable-dependencies exe))
-                       '()))
-         (ts (cabal-package-test-suites cabal))
-         (ts-deps (if (pair? ts)
-                       (map cabal-dependency-name
-                            (append-map cabal-test-suite-dependencies ts))
                        '())))
-    (if include-test-dependencies?
+    (delete-duplicates (append lib-deps exe-deps))))
-        (delete-duplicates (append lib-deps exe-deps ts-deps))
+
-        (delete-duplicates (append lib-deps exe-deps)))))
+(define (cabal-test-dependencies->names cabal)
+  "Return the list of test suite dependencies from the CABAL package
+object."
+  (let* ((ts (cabal-package-test-suites cabal))
+         (ts-deps (if (pair? ts)
+                      (map cabal-dependency-name
+                           (append-map cabal-test-suite-dependencies ts))
+                      '())))
+    ts-deps))
+
+(define (cabal-custom-setup-dependencies->names cabal)
+  "Return the list of custom-setup dependencies from the CABAL package
+object."
+  (let* ((custom-setup-dependencies (and=> (cabal-package-custom-setup cabal)
+                                           cabal-custom-setup-dependencies)))
+    (map cabal-dependency-name custom-setup-dependencies)))
 
 (define (filter-dependencies dependencies own-name)
   "Filter the dependencies included with the GHC compiler from DEPENDENCIES, a
@@ -199,8 +208,23 @@ representation of a Cabal file as produced by 'read-cabal'."
            (map hackage-name->package-name
                 ((compose (cut filter-dependencies <>
                                (cabal-package-name cabal))
-                          (cut cabal-dependencies->names <>
+                          (cut cabal-dependencies->names <>))
-                               include-test-dependencies?))
+                 cabal))))
+      (map (lambda (name)
+             (list name (list 'unquote (string->symbol name))))
+           names)))
+
+  (define native-dependencies
+    (let ((names
+           (map hackage-name->package-name
+                ((compose (cut filter-dependencies <>
+                               (cabal-package-name cabal))
+                          ;; FIXME: Check include-test-dependencies?
+                          (lambda (cabal)
+                            (append (if include-test-dependencies?
+                                        (cabal-test-dependencies->names cabal)
+                                        '())
+                                    (cabal-custom-setup-dependencies->names cabal))))
                  cabal))))
       (map (lambda (name)
              (list name (list 'unquote (string->symbol name))))
@@ -234,6 +258,7 @@ representation of a Cabal file as produced by 'read-cabal'."
                         "failed to download tar archive")))))
        (build-system haskell-build-system)
        ,@(maybe-inputs 'inputs dependencies)
+       ,@(maybe-inputs 'native-inputs native-dependencies)
        ,@(maybe-arguments)
        (home-page ,(cabal-package-home-page cabal))
        (synopsis ,(cabal-package-synopsis cabal))