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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2016 Andy Patterson <ajpatter@uwaterloo.ca>
+;;;
+;;; 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 (guix build asdf-build-system)
+  #:use-module ((guix build gnu-build-system) #:prefix gnu:)
+  #:use-module (guix build utils)
+  #:use-module (guix build lisp-utils)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-26)
+  #:use-module (ice-9 rdelim)
+  #:use-module (ice-9 receive)
+  #:use-module (ice-9 regex)
+  #:use-module (ice-9 match)
+  #:use-module (ice-9 format)
+  #:use-module (ice-9 ftw)
+  #:export (%standard-phases
+            %standard-phases/source
+            asdf-build
+            asdf-build/source))
+
+;; Commentary:
+;;
+;; System for building ASDF packages; creating executable programs and images
+;; from them.
+;;
+;; Code:
+
+(define %object-prefix "/lib")
+
+(define (source-install-prefix lisp)
+  (string-append %install-prefix "/" lisp "-source"))
+
+(define %system-install-prefix
+  (string-append %install-prefix "/systems"))
+
+(define (output-path->package-name path)
+  (package-name->name+version (strip-store-file-name path)))
+
+(define (outputs->name outputs)
+  (output-path->package-name
+   (assoc-ref outputs "out")))
+
+(define (lisp-source-directory output lisp name)
+  (string-append output (source-install-prefix lisp) "/" name))
+
+(define (source-directory output name)
+  (string-append output %install-prefix "/source/" name))
+
+(define (library-directory output lisp)
+  (string-append output %object-prefix
+                 "/" lisp))
+
+(define (output-translation source-path
+                            object-output
+                            lisp)
+  "Return a translation for the system's source path
+to it's binary output."
+  `((,source-path
+     :**/ :*.*.*)
+    (,(library-directory object-output lisp)
+     :**/ :*.*.*)))
+
+(define (source-asd-file output lisp name asd-file)
+  (string-append (lisp-source-directory output lisp name) "/" asd-file))
+
+(define (copy-files-to-output outputs output name)
+  "Copy all files from OUTPUT to \"out\".  Create an extra link to any
+system-defining files in the source to a convenient location.  This is done
+before any compiling so that the compiled source locations will be valid."
+  (let* ((out (assoc-ref outputs output))
+         (source (getcwd))
+         (target (source-directory out name))
+         (system-path (string-append out %system-install-prefix)))
+    (copy-recursively source target)
+    (mkdir-p system-path)
+    (for-each
+     (lambda (file)
+       (symlink file
+                (string-append system-path "/" (basename file))))
+     (find-files target "\\.asd$"))
+    #t))
+
+(define* (install #:key outputs #:allow-other-keys)
+  "Copy and symlink all the source files."
+  (copy-files-to-output outputs "out" (outputs->name outputs)))
+
+(define* (copy-source #:key outputs lisp #:allow-other-keys)
+  "Copy the source to \"out\"."
+  (let* ((out (assoc-ref outputs "out"))
+         (name (remove-lisp-from-name (output-path->package-name out) lisp))
+         (install-path (string-append out %install-prefix)))
+    (copy-files-to-output outputs "out" name)
+    ;; Hide the files from asdf
+    (with-directory-excursion install-path
+      (rename-file "source" (string-append lisp "-source"))
+      (delete-file-recursively "systems")))
+  #t)
+
+(define* (build #:key outputs inputs lisp asd-file
+                #:allow-other-keys)
+  "Compile the system."
+  (let* ((out (assoc-ref outputs "out"))
+         (name (remove-lisp-from-name (output-path->package-name out) lisp))
+         (source-path (lisp-source-directory out lisp name))
+         (translations (wrap-output-translations
+                        `(,(output-translation source-path
+                                               out
+                                               lisp))))
+         (asd-file (and=> asd-file (cut source-asd-file out lisp name <>))))
+
+    (setenv "ASDF_OUTPUT_TRANSLATIONS"
+            (replace-escaped-macros (format #f "~S" translations)))
+
+    ;; We don't need this if we have the asd file, and it can mess with the
+    ;; load ordering we're trying to enforce
+    (unless asd-file
+      (prepend-to-source-registry (string-append source-path "//")))
+
+    (setenv "HOME" out) ; ecl's asdf sometimes wants to create $HOME/.cache
+
+    (parameterize ((%lisp (string-append
+                           (assoc-ref inputs lisp) "/bin/" lisp)))
+      (compile-system name lisp asd-file))
+
+    ;; As above, ecl will sometimes create this even though it doesn't use it
+
+    (let ((cache-directory (string-append out "/.cache")))
+      (when (directory-exists? cache-directory)
+        (delete-file-recursively cache-directory))))
+  #t)
+
+(define* (check #:key lisp tests? outputs inputs asd-file
+                #:allow-other-keys)
+  "Test the system."
+  (let* ((name (remove-lisp-from-name (outputs->name outputs) lisp))
+         (out (assoc-ref outputs "out"))
+         (asd-file (and=> asd-file (cut source-asd-file out lisp name <>))))
+    (if tests?
+        (parameterize ((%lisp (string-append
+                               (assoc-ref inputs lisp) "/bin/" lisp)))
+          (test-system name lisp asd-file))
+        (format #t "test suite not run~%")))
+  #t)
+
+(define* (patch-asd-files #:key outputs
+                          inputs
+                          lisp
+                          special-dependencies
+                          test-only-systems
+                          #:allow-other-keys)
+  "Patch any asd files created by the compilation process so that they can
+find their dependencies.  Exclude any TEST-ONLY-SYSTEMS which were only
+included to run tests.  Add any SPECIAL-DEPENDENCIES which the LISP
+implementation itself provides."
+  (let* ((out (assoc-ref outputs "out"))
+         (name (remove-lisp-from-name (output-path->package-name out) lisp))
+         (registry (lset-difference
+                    (lambda (input system)
+                      (match input
+                        ((name . path) (string=? name system))))
+                    (lisp-dependencies lisp inputs)
+                    test-only-systems))
+         (lisp-systems (map first registry)))
+
+    (for-each
+     (lambda (asd-file)
+       (patch-asd-file asd-file registry lisp
+                       (append lisp-systems special-dependencies)))
+     (find-files out "\\.asd$")))
+  #t)
+
+(define* (symlink-asd-files #:key outputs lisp #:allow-other-keys)
+  "Create an extra reference to the system in a convenient location."
+  (let* ((out (assoc-ref outputs "out")))
+    (for-each
+     (lambda (asd-file)
+       (substitute* asd-file
+         ((";;; Built for.*") "") ; remove potential non-determinism
+         (("^\\(DEFSYSTEM(.*)$" all end) (string-append "(asdf:defsystem" end)))
+       (receive (new-asd-file asd-file-directory)
+           (bundle-asd-file out asd-file lisp)
+         (mkdir-p asd-file-directory)
+         (symlink asd-file new-asd-file)
+         ;; Update the source registry for future phases which might want to
+         ;; use the newly compiled system.
+         (prepend-to-source-registry
+          (string-append asd-file-directory "/"))))
+
+     (find-files (string-append out %object-prefix) "\\.asd$"))
+)
+  #t)
+
+(define* (cleanup-files #:key outputs lisp
+                             #:allow-other-keys)
+  "Remove any compiled files which are not a part of the final bundle."
+  (let ((out (assoc-ref outputs "out")))
+    (match lisp
+      ("sbcl"
+       (for-each
+        (lambda (file)
+          (unless (string-suffix? "--system.fasl" file)
+            (delete-file file)))
+        (find-files out "\\.fasl$")))
+      ("ecl"
+       (for-each delete-file
+                 (append (find-files out "\\.fas$")
+                         (find-files out "\\.o$")
+                         (find-files out "\\.a$")))))
+
+    (with-directory-excursion (library-directory out lisp)
+      (for-each
+       (lambda (file)
+         (rename-file file
+                      (string-append "./" (basename file))))
+       (find-files "."))
+      (for-each delete-file-recursively
+                (scandir "."
+                         (lambda (file)
+                           (and
+                            (directory-exists? file)
+                            (string<> "." file)
+                            (string<> ".." file)))))))
+  #t)
+
+(define* (strip #:key lisp #:allow-other-keys #:rest args)
+  ;; stripping sbcl binaries removes their entry program and extra systems
+  (or (string=? lisp "sbcl")
+      (apply (assoc-ref gnu:%standard-phases 'strip) args)))
+
+(define %standard-phases/source
+  (modify-phases gnu:%standard-phases
+    (delete 'configure)
+    (delete 'check)
+    (delete 'build)
+    (replace 'install install)))
+
+(define %standard-phases
+  (modify-phases gnu:%standard-phases
+    (delete 'configure)
+    (delete 'install)
+    (replace 'build build)
+    (add-before 'build 'copy-source copy-source)
+    (replace 'check check)
+    (replace 'strip strip)
+    (add-after 'check 'link-dependencies patch-asd-files)
+    (add-after 'link-dependencies 'cleanup cleanup-files)
+    (add-after 'cleanup 'create-symlinks symlink-asd-files)))
+
+(define* (asdf-build #:key inputs
+                     (phases %standard-phases)
+                     #:allow-other-keys
+                     #:rest args)
+  (apply gnu:gnu-build
+         #:inputs inputs
+         #:phases phases
+         args))
+
+(define* (asdf-build/source #:key inputs
+                            (phases %standard-phases/source)
+                            #:allow-other-keys
+                            #:rest args)
+  (apply gnu:gnu-build
+         #:inputs inputs
+         #:phases phases
+         args))
+
+;;; asdf-build-system.scm ends here