build-system: Add chicken-build-system.

* guix/build-system/chicken.scm: New file.
* guix/build/chicken-build-system.scm: New file.
* Makefile.am: Add them.
* doc/guix.texi: Document it.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

1 files changed, 133 insertions, 0 deletions

diff --git a/guix/build/chicken-build-system.scm b/guix/build/chicken-build-system.scm
new file mode 100644
index 0000000000..5db9906acf
--- /dev/null
+++ b/guix/build/chicken-build-system.scm
@@ -0,0 +1,133 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2020 raingloom <raingloom@riseup.net>
+;;;
+;;; 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 chicken-build-system)
+  #:use-module ((guix build gnu-build-system) #:prefix gnu:)
+  #:use-module (guix build union)
+  #:use-module (guix build utils)
+  #:use-module (ice-9 match)
+  #:use-module (ice-9 ftw)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-26)
+  #:use-module (rnrs io ports)
+  #:use-module (rnrs bytevectors)
+  #:export (%standard-phases
+            chicken-build))
+
+;; CHICKEN_EGG_CACHE is where sources are fetched and binaries are built
+;; CHICKEN_INSTALL_REPOSITORY is where dependencies are looked up
+;; its first component is also where new eggs are installed.
+
+;; TODO: deduplicate with go-build-system.scm ?
+;; TODO: the binary version should be defined in one of the relevant modules
+;; instead of being hardcoded everywhere. Tried to do that but got undefined
+;; variable errors.
+
+(define (chicken-package? name)
+  (string-prefix? "chicken-" name))
+
+(define* (setup-chicken-environment #:key inputs outputs #:allow-other-keys)
+  (setenv "CHICKEN_INSTALL_REPOSITORY"
+          (string-concatenate
+           ;; see TODO item about binary version above
+           (append (list (assoc-ref outputs "out") "/var/lib/chicken/11/")
+                   (let ((oldenv (getenv "CHICKEN_INSTALL_REPOSITORY")))
+                     (if oldenv
+                         (list  ":" oldenv)
+                         '())))))
+  (setenv "CHICKEN_EGG_CACHE" (getcwd))
+  #t)
+
+;; This is copied from go-build-system.scm so it could probably be simplified.
+;; I used it because the source of the egg needs to be unpacked into a directory
+;; that is named after the egg and I knew that the go build system does that.
+(define* (unpack #:key source egg-name unpack-path #:allow-other-keys)
+  "Relative to $CHICKEN_EGG_CACHE, unpack SOURCE in UNPACK-PATH, or EGG-NAME
+when UNPACK-PATH is unset.  If the SOURCE archive has a single top level
+directory, it is stripped so that the sources appear directly under UNPACK-PATH.
+When SOURCE is a directory, copy its content into UNPACK-PATH instead of
+unpacking."
+  (define (unpack-maybe-strip source dest)
+    (let* ((scratch-dir (string-append (or (getenv "TMPDIR") "/tmp")
+                                       "/scratch-dir"))
+           (out (mkdir-p scratch-dir)))
+      (with-directory-excursion scratch-dir
+        (if (string-suffix? ".zip" source)
+            (invoke "unzip" source)
+            (invoke "tar" "-xvf" source))
+        (let ((top-level-files (remove (lambda (x)
+                                         (member x '("." "..")))
+                                       (scandir "."))))
+          (match top-level-files
+            ((top-level-file)
+             (when (file-is-directory? top-level-file)
+               (copy-recursively top-level-file dest #:keep-mtime? #t)))
+            (_
+             (copy-recursively "." dest #:keep-mtime? #t)))))
+      (delete-file-recursively scratch-dir)))
+
+  (when (string-null? egg-name)
+    (display "WARNING: The egg name is unset.\n"))
+  (when (string-null? unpack-path)
+    (set! unpack-path egg-name))
+  (let ((dest (string-append (getenv "CHICKEN_EGG_CACHE") "/" unpack-path)))
+    (mkdir-p dest)
+    (if (file-is-directory? source)
+        (copy-recursively source dest #:keep-mtime? #t)
+        (unpack-maybe-strip source dest)))
+  #t)
+
+(define* (build #:key egg-name #:allow-other-keys)
+  "Build the Chicken egg named by EGG-NAME"
+  (invoke "chicken-install" "-cached" "-no-install" egg-name))
+
+(define* (install #:key egg-name #:allow-other-keys)
+  "Install the already built egg named by EGG-NAME"
+  (invoke "chicken-install" "-cached" egg-name))
+
+(define* (check #:key egg-name tests? #:allow-other-keys)
+  "Build and run tests for the Chicken egg EGG-NAME"
+  ;; there is no "-test-only" option, but we've already run install
+  ;; so this just runs tests.
+  ;; i think it's a fair assumption that phases won't be reordered.
+  (setenv "CHICKEN_REPOSITORY_PATH"
+          (string-append (getenv "CHICKEN_INSTALL_REPOSITORY")
+                         ":"
+                         (getenv "CHICKEN_REPOSITORY_PATH")))
+  (when tests?
+    (invoke "chicken-install" "-cached" "-test" "-no-install" egg-name)))
+
+;; It doesn't look like Chicken generates any unnecessary references.
+;; So we don't have to remove them either. Nice.
+
+(define %standard-phases
+  (modify-phases gnu:%standard-phases
+    (replace 'unpack unpack)
+    (delete 'bootstrap)
+    (delete 'configure)
+    (delete 'patch-generated-file-shebangs)
+    (add-before 'unpack 'setup-chicken-environment setup-chicken-environment)
+    (replace 'build build)
+    (delete 'check)
+    (replace 'install install)
+    (add-after 'install 'check check)))
+
+(define* (chicken-build #:key inputs (phases %standard-phases)
+                        #:allow-other-keys #:rest args)
+  "Build the given Chicken package, applying all of PHASES in order."
+  (apply gnu:gnu-build #:inputs inputs #:phases phases args))