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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2016 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/>.
+
+;;; This program replicates the behavior of Hydra's 'hydra-eval-guile-job'.
+;;; It evaluates the Hydra job defined by the program passed as its first
+;;; arguments and outputs an sexp of the jobs on standard output.
+
+(use-modules (guix store)
+ (srfi srfi-19)
+ (ice-9 match)
+ (ice-9 pretty-print)
+ (ice-9 format))
+
+(define %user-module
+ ;; Hydra user module.
+ (let ((m (make-module)))
+ (beautify-user-module! m)
+ m))
+
+(define (call-with-time thunk kont)
+ "Call THUNK and pass KONT the elapsed time followed by THUNK's return
+values."
+ (let* ((start (current-time time-monotonic))
+ (result (call-with-values thunk list))
+ (end (current-time time-monotonic)))
+ (apply kont (time-difference end start) result)))
+
+(define (call-with-time-display thunk)
+ "Call THUNK and write to the current output port its duration."
+ (call-with-time thunk
+ (lambda (time . results)
+ (format #t "~,3f seconds~%"
+ (+ (time-second time)
+ (/ (time-nanosecond time) 1e9)))
+ (apply values results))))
+
+
+;; Without further ado...
+(match (command-line)
+ ((command file)
+ ;; Load FILE, a Scheme file that defines Hydra jobs.
+ (let ((port (current-output-port)))
+ (save-module-excursion
+ (lambda ()
+ (set-current-module %user-module)
+ (primitive-load file)))
+
+ (with-store store
+ ;; Make sure we don't resort to substitutes.
+ (set-build-options store
+ #:use-substitutes? #f
+ #:substitute-urls '())
+
+ ;; Grafts can trigger early builds. We do not want that to happen
+ ;; during evaluation, so use a sledgehammer to catch such problems.
+ (set! build-things
+ (lambda (store . args)
+ (format (current-error-port)
+ "error: trying to build things during evaluation!~%")
+ (format (current-error-port)
+ "'build-things' arguments: ~s~%" args)
+ (exit 1)))
+
+ ;; Call the entry point of FILE and print the resulting job sexp.
+ (pretty-print
+ (match ((module-ref %user-module 'hydra-jobs) store '())
+ (((names . thunks) ...)
+ (map (lambda (job thunk)
+ (format (current-error-port) "evaluating '~a'... " job)
+ (force-output (current-error-port))
+ (cons job (call-with-time-display thunk)))
+ names thunks)))
+ port))))
+ ((command _ ...)
+ (format (current-error-port) "Usage: ~a FILE
+Evaluate the Hydra jobs defined in FILE.~%"
+ command)
+ (exit 1)))
+
+;;; Local Variables:
+;;; eval: (put 'call-with-time 'scheme-indent-function 1)
+;;; End:
+