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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2016, 2017, 2019, 2020 Ludovic Courtès <ludo@gnu.org>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (test-transformations)
+  #:use-module (guix tests)
+  #:use-module (guix store)
+  #:use-module ((guix gexp) #:select (lower-object))
+  #:use-module (guix derivations)
+  #:use-module (guix packages)
+  #:use-module (guix git-download)
+  #:use-module (guix build-system)
+  #:use-module (guix build-system gnu)
+  #:use-module (guix transformations)
+  #:use-module (guix ui)
+  #:use-module (guix utils)
+  #:use-module (guix git)
+  #:use-module (gnu packages)
+  #:use-module (gnu packages base)
+  #:use-module (gnu packages busybox)
+  #:use-module (ice-9 match)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-26)
+  #:use-module (srfi srfi-64))
+
+
+(test-begin "transformations")
+
+(test-assert "options->transformation, no transformations"
+  (let ((p (dummy-package "foo"))
+        (t (options->transformation '())))
+    (eq? (t p) p)))
+
+(test-assert "options->transformation, with-source"
+  ;; Our pseudo-package is called 'guix.scm' so the 'guix.scm' source should
+  ;; be applicable.
+  (let* ((p (dummy-package "guix.scm"))
+         (s (search-path %load-path "guix.scm"))
+         (t (options->transformation `((with-source . ,s)))))
+    (with-store store
+      (let* ((new (t p))
+             (source (run-with-store store
+                       (lower-object (package-source new)))))
+        (and (not (eq? new p))
+             (string=? source
+                       (add-to-store store "guix.scm" #t
+                                     "sha256" s)))))))
+
+(test-assert "options->transformation, with-source, replacement"
+  ;; Same, but this time the original package has a 'replacement' field.  We
+  ;; expect that replacement to be set to #f in the new package.
+  (let* ((p (dummy-package "guix.scm" (replacement coreutils)))
+         (s (search-path %load-path "guix.scm"))
+         (t (options->transformation `((with-source . ,s)))))
+    (let ((new (t p)))
+      (and (not (eq? new p))
+           (not (package-replacement new))))))
+
+(test-assert "options->transformation, with-source, with version"
+  ;; Our pseudo-package is called 'guix.scm' so the 'guix.scm-2.0' source
+  ;; should be applicable, and its version should be extracted.
+  (let ((p (dummy-package "foo"))
+        (s (search-path %load-path "guix.scm")))
+    (call-with-temporary-directory
+     (lambda (directory)
+       (let* ((f (string-append directory "/foo-42.0.tar.gz"))
+              (t (options->transformation `((with-source . ,f)))))
+         (copy-file s f)
+         (with-store store
+           (let* ((new (t p))
+                  (source (run-with-store store
+                            (lower-object (package-source new)))))
+             (and (not (eq? new p))
+                  (string=? (package-name new) (package-name p))
+                  (string=? (package-version new) "42.0")
+                  (string=? source
+                            (add-to-store store (basename f) #t
+                                          "sha256" f))))))))))
+
+(test-assert "options->transformation, with-source, no matches"
+  ;; When a transformation in not applicable, a warning must be raised.
+  (let* ((p (dummy-package "foobar"))
+         (s (search-path %load-path "guix.scm"))
+         (t (options->transformation `((with-source . ,s)))))
+    (let* ((port (open-output-string))
+           (new  (parameterize ((guix-warning-port port))
+                   (t p))))
+      (and (eq? new p)
+           (string-contains (get-output-string port)
+                            "had no effect")))))
+
+(test-assert "options->transformation, with-source, PKG=URI"
+  (let* ((p (dummy-package "foo"))
+         (s (search-path %load-path "guix.scm"))
+         (f (string-append "foo=" s))
+         (t (options->transformation `((with-source . ,f)))))
+    (with-store store
+      (let* ((new (t p))
+             (source (run-with-store store
+                       (lower-object (package-source new)))))
+        (and (not (eq? new p))
+             (string=? (package-name new) (package-name p))
+             (string=? (package-version new)
+                       (package-version p))
+             (string=? source
+                       (add-to-store store (basename s) #t
+                                     "sha256" s)))))))
+
+(test-assert "options->transformation, with-source, PKG@VER=URI"
+  (let* ((p (dummy-package "foo"))
+         (s (search-path %load-path "guix.scm"))
+         (f (string-append "foo@42.0=" s))
+         (t (options->transformation `((with-source . ,f)))))
+    (with-store store
+      (let* ((new (t p))
+             (source (run-with-store store
+                       (lower-object (package-source new)))))
+        (and (not (eq? new p))
+             (string=? (package-name new) (package-name p))
+             (string=? (package-version new) "42.0")
+             (string=? source
+                       (add-to-store store (basename s) #t
+                                     "sha256" s)))))))
+
+(test-assert "options->transformation, with-input"
+  (let* ((p (dummy-package "guix.scm"
+              (inputs `(("foo" ,(specification->package "coreutils"))
+                        ("bar" ,(specification->package "grep"))
+                        ("baz" ,(dummy-package "chbouib"
+                                  (native-inputs `(("x" ,grep)))))))))
+         (t (options->transformation '((with-input . "coreutils=busybox")
+                                       (with-input . "grep=findutils")))))
+    (let ((new (t p)))
+      (and (not (eq? new p))
+           (match (package-inputs new)
+             ((("foo" dep1) ("bar" dep2) ("baz" dep3))
+              (and (string=? (package-full-name dep1)
+                             (package-full-name busybox))
+                   (string=? (package-full-name dep2)
+                             (package-full-name findutils))
+                   (string=? (package-name dep3) "chbouib")
+                   (match (package-native-inputs dep3)
+                     ((("x" dep))
+                      (string=? (package-full-name dep)
+                                (package-full-name findutils)))))))))))
+
+(test-assert "options->transformation, with-graft"
+  (let* ((p (dummy-package "guix.scm"
+              (inputs `(("foo" ,grep)
+                        ("bar" ,(dummy-package "chbouib"
+                                  (native-inputs `(("x" ,grep)))))))))
+         (t (options->transformation '((with-graft . "grep=findutils")))))
+    (let ((new (t p)))
+      (and (not (eq? new p))
+           (match (package-inputs new)
+             ((("foo" dep1) ("bar" dep2))
+              (and (string=? (package-full-name dep1)
+                             (package-full-name grep))
+                   (string=? (package-full-name (package-replacement dep1))
+                             (package-full-name findutils))
+                   (string=? (package-name dep2) "chbouib")
+                   (match (package-native-inputs dep2)
+                     ((("x" dep))
+                      (with-store store
+                        (string=? (derivation-file-name
+                                   (package-derivation store findutils))
+                                  (derivation-file-name
+                                   (package-derivation store dep)))))))))))))
+
+(test-equal "options->transformation, with-branch"
+  (git-checkout (url "https://example.org")
+                (branch "devel")
+                (recursive? #t))
+  (let* ((p (dummy-package "guix.scm"
+              (inputs `(("foo" ,grep)
+                        ("bar" ,(dummy-package "chbouib"
+                                  (source (origin
+                                            (method git-fetch)
+                                            (uri (git-reference
+                                                  (url "https://example.org")
+                                                  (commit "cabba9e")))
+                                            (sha256 #f)))))))))
+         (t (options->transformation '((with-branch . "chbouib=devel")))))
+    (let ((new (t p)))
+      (and (not (eq? new p))
+           (match (package-inputs new)
+             ((("foo" dep1) ("bar" dep2))
+              (and (string=? (package-full-name dep1)
+                             (package-full-name grep))
+                   (string=? (package-name dep2) "chbouib")
+                   (package-source dep2))))))))
+
+(test-equal "options->transformation, with-commit"
+  (git-checkout (url "https://example.org")
+                (commit "abcdef")
+                (recursive? #t))
+  (let* ((p (dummy-package "guix.scm"
+              (inputs `(("foo" ,grep)
+                        ("bar" ,(dummy-package "chbouib"
+                                  (source (origin
+                                            (method git-fetch)
+                                            (uri (git-reference
+                                                  (url "https://example.org")
+                                                  (commit "cabba9e")))
+                                            (sha256 #f)))))))))
+         (t (options->transformation '((with-commit . "chbouib=abcdef")))))
+    (let ((new (t p)))
+      (and (not (eq? new p))
+           (match (package-inputs new)
+             ((("foo" dep1) ("bar" dep2))
+              (and (string=? (package-full-name dep1)
+                             (package-full-name grep))
+                   (string=? (package-name dep2) "chbouib")
+                   (package-source dep2))))))))
+
+(test-equal "options->transformation, with-git-url"
+  (let ((source (git-checkout (url "https://example.org")
+                              (recursive? #t))))
+    (list source source))
+  (let* ((p (dummy-package "guix.scm"
+              (inputs `(("foo" ,grep)
+                        ("bar" ,(dummy-package "chbouib"
+                                  (native-inputs `(("x" ,grep)))))))))
+         (t (options->transformation '((with-git-url . "grep=https://example.org")))))
+    (let ((new (t p)))
+      (and (not (eq? new p))
+           (match (package-inputs new)
+             ((("foo" dep1) ("bar" dep2))
+              (and (string=? (package-full-name dep1)
+                             (package-full-name grep))
+                   (string=? (package-name dep2) "chbouib")
+                   (match (package-native-inputs dep2)
+                     ((("x" dep3))
+                      (map package-source (list dep1 dep3)))))))))))
+
+(test-equal "options->transformation, with-git-url + with-branch"
+  ;; Combine the two options and make sure the 'with-branch' transformation
+  ;; comes after the 'with-git-url' transformation.
+  (let ((source (git-checkout (url "https://example.org")
+                              (branch "BRANCH")
+                              (recursive? #t))))
+    (list source source))
+  (let* ((p (dummy-package "guix.scm"
+              (inputs `(("foo" ,grep)
+                        ("bar" ,(dummy-package "chbouib"
+                                  (native-inputs `(("x" ,grep)))))))))
+         (t (options->transformation
+             (reverse '((with-git-url
+                         . "grep=https://example.org")
+                        (with-branch . "grep=BRANCH"))))))
+    (let ((new (t p)))
+      (and (not (eq? new p))
+           (match (package-inputs new)
+             ((("foo" dep1) ("bar" dep2))
+              (and (string=? (package-name dep1) "grep")
+                   (string=? (package-name dep2) "chbouib")
+                   (match (package-native-inputs dep2)
+                     ((("x" dep3))
+                      (map package-source (list dep1 dep3)))))))))))
+
+(define* (depends-on-toolchain? p #:optional (toolchain "gcc-toolchain"))
+  "Return true if P depends on TOOLCHAIN instead of the default tool chain."
+  (define toolchain-packages
+    '("gcc" "binutils" "glibc" "ld-wrapper"))
+
+  (define (package-name* obj)
+    (and (package? obj) (package-name obj)))
+
+  (match (bag-build-inputs (package->bag p))
+    (((_ (= package-name* packages) . _) ...)
+     (and (not (any (cut member <> packages) toolchain-packages))
+          (member toolchain packages)))))
+
+(test-assert "options->transformation, with-c-toolchain"
+  (let* ((dep0 (dummy-package "chbouib"
+                 (build-system gnu-build-system)
+                 (native-inputs `(("y" ,grep)))))
+         (dep1 (dummy-package "stuff"
+                 (native-inputs `(("x" ,dep0)))))
+         (p    (dummy-package "thingie"
+                 (build-system gnu-build-system)
+                 (inputs `(("foo" ,grep)
+                           ("bar" ,dep1)))))
+         (t    (options->transformation
+                '((with-c-toolchain . "chbouib=gcc-toolchain")))))
+    ;; Here we check that the transformation applies to DEP0 and all its
+    ;; dependents: DEP0 must use GCC-TOOLCHAIN, DEP1 must use GCC-TOOLCHAIN
+    ;; and the DEP0 that uses GCC-TOOLCHAIN, and so on.
+    (let ((new (t p)))
+      (and (depends-on-toolchain? new "gcc-toolchain")
+           (match (bag-build-inputs (package->bag new))
+             ((("foo" dep0) ("bar" dep1) _ ...)
+              (and (depends-on-toolchain? dep1 "gcc-toolchain")
+                   (not (depends-on-toolchain? dep0 "gcc-toolchain"))
+                   (string=? (package-full-name dep0)
+                             (package-full-name grep))
+                   (match (bag-build-inputs (package->bag dep1))
+                     ((("x" dep) _ ...)
+                      (and (depends-on-toolchain? dep "gcc-toolchain")
+                           (match (bag-build-inputs (package->bag dep))
+                             ((("y" dep) _ ...)   ;this one is unchanged
+                              (eq? dep grep)))))))))))))
+
+(test-equal "options->transformation, with-c-toolchain twice"
+  (package-full-name grep)
+  (let* ((dep0 (dummy-package "chbouib"))
+         (dep1 (dummy-package "stuff"))
+         (p    (dummy-package "thingie"
+                 (build-system gnu-build-system)
+                 (inputs `(("foo" ,dep0)
+                           ("bar" ,dep1)
+                           ("baz" ,grep)))))
+         (t    (options->transformation
+                '((with-c-toolchain . "chbouib=clang-toolchain")
+                  (with-c-toolchain . "stuff=clang-toolchain")))))
+    (let ((new (t p)))
+      (and (depends-on-toolchain? new "clang-toolchain")
+           (match (bag-build-inputs (package->bag new))
+             ((("foo" dep0) ("bar" dep1) ("baz" dep2) _ ...)
+              (and (depends-on-toolchain? dep0 "clang-toolchain")
+                   (depends-on-toolchain? dep1 "clang-toolchain")
+                   (not (depends-on-toolchain? dep2 "clang-toolchain"))
+                   (package-full-name dep2))))))))
+
+(test-assert "options->transformation, with-c-toolchain, no effect"
+  (let ((p (dummy-package "thingie"))
+        (t (options->transformation
+            '((with-c-toolchain . "does-not-exist=gcc-toolchain")))))
+    ;; When it has no effect, '--with-c-toolchain' returns P.
+    (eq? (t p) p)))
+
+(test-equal "options->transformation, with-debug-info"
+  '(#:strip-binaries? #f)
+  (let* ((dep  (dummy-package "chbouib"))
+         (p    (dummy-package "thingie"
+                 (build-system gnu-build-system)
+                 (inputs `(("foo" ,dep)
+                           ("bar" ,grep)))))
+         (t    (options->transformation
+                '((with-debug-info . "chbouib")))))
+    (let ((new (t p)))
+      (match (package-inputs new)
+        ((("foo" dep0) ("bar" dep1))
+         (and (string=? (package-full-name dep1)
+                        (package-full-name grep))
+              (package-arguments (package-replacement dep0))))))))
+
+(test-assert "options->transformation, without-tests"
+  (let* ((dep (dummy-package "dep"))
+         (p   (dummy-package "foo"
+                (inputs `(("dep" ,dep)))))
+         (t   (options->transformation '((without-tests . "dep")
+                                         (without-tests . "tar")))))
+    (let ((new (t p)))
+      (match (bag-direct-inputs (package->bag new))
+        ((("dep" dep) ("tar" tar) _ ...)
+         ;; TODO: Check whether TAR has #:tests? #f when transformations
+         ;; apply to implicit inputs.
+         (equal? (package-arguments dep)
+                 '(#:tests? #f)))))))
+
+(test-end)
+
+;;; Local Variables:
+;;; eval: (put 'dummy-package 'scheme-indent-function 1)
+;;; End: