job: Add <job> record type.

* src/cuirass/job.scm: New file.
* Makefile.am (dist_pkgmodule_DATA): Add it.
* bin/cuirass.in (evaluate, build-packages): Use it.

Makefile.am

@@ -5,6 +5,7 @@ noinst_SCRIPTS = pre-inst-env
 
 dist_pkgmodule_DATA = \
   src/cuirass/base.scm \
+  src/cuirass/job.scm \
   src/cuirass/ui.scm
 
 nodist_pkgmodule_DATA = \

bin/cuirass.in

@@ -22,6 +22,7 @@ exec ${GUILE:-@GUILE@} --no-auto-compile -e main -s "$0" "$@"
 ;;; along with Cuirass.  If not, see <http://www.gnu.org/licenses/>.
 
 (use-modules (cuirass base)
+             (cuirass job)
              (cuirass ui)
              (ice-9 getopt-long)
              (ice-9 match))
@@ -74,12 +75,11 @@ DIR if required."
     m))
 
 (define (build-packages store jobs)
-  "Build JOBS which is a list of job.  ((job-symbol pair ...) ...)"
-  (map (lambda (thing)
-         (let ((name (symbol->string (car thing)))
-               (drv  (cdadr thing)))
-           (format #t "building ~A => ~A~%" name drv)
-           ((guix-variable 'derivations 'build-derivations) store (list drv))))
+  "Build JOBS which is a list of <job> objects."
+  (map (match-lambda
+         (($ <job> name drv)
+          (format #t "building ~A => ~A~%" name drv)
+          ((guix-variable 'derivations 'build-derivations) store (list drv))))
        jobs))
 
 (define (evaluate dir spec)
@@ -101,7 +101,9 @@ DIR if required."
             (map (lambda (job thunk)
                    (format (current-error-port) "evaluating '~a'... " job)
                    (force-output (current-error-port))
-                   (cons job (call-with-time-display thunk)))
+                   (make-job (symbol->string job)
+                             (assoc-ref (call-with-time-display thunk)
+                                        'derivation)))
                  names thunks)))))
       (lambda ()
         ((guix-variable 'store 'close-connection) store)))))

src/cuirass/job.scm

@@ -0,0 +1,32 @@
+;;;; job.scm - data structures for jobs
+;;;
+;;; Copyright © 2016 Mathieu Lirzin <mthl@gnu.org>
+;;;
+;;; This file is part of Cuirass.
+;;;
+;;; Cuirass 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.
+;;;
+;;; Cuirass 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 Cuirass.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (cuirass job)
+  #:use-module (srfi srfi-9)
+  #:export (<job>
+            make-job
+            job?
+            job-name
+            job-derivation))
+
+(define-record-type <job>
+  (make-job name derivation)
+  job?
+  (name       job-name)                 ;string
+  (derivation job-derivation))          ;string