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;;;; test-driver.scm - Guile test driver for Automake testsuite harness

(define script-version "2017-03-22.13") ;UTC

;;; Copyright © 2015, 2016 Mathieu Lirzin <mthl@gnu.org>
;;;
;;; This program 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.
;;;
;;; This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.

;;;; Commentary:
;;;
;;; This script provides a Guile test driver using the SRFI-64 Scheme API for
;;; test suites.  SRFI-64 is distributed with Guile since version 2.0.9.
;;;
;;;; Code:

(use-modules (ice-9 getopt-long)
             (ice-9 pretty-print)
             (srfi srfi-26)
             (srfi srfi-64))

(define (show-help)
  (display "Usage:
   test-driver --test-name=NAME --log-file=PATH --trs-file=PATH
               [--expect-failure={yes|no}] [--color-tests={yes|no}]
               [--enable-hard-errors={yes|no}] [--brief={yes|no}}] [--]
               TEST-SCRIPT [TEST-SCRIPT-ARGUMENTS]
The '--test-name', '--log-file' and '--trs-file' options are mandatory.\n"))

(define %options
  '((test-name                 (value #t))
    (log-file                  (value #t))
    (trs-file                  (value #t))
    (color-tests               (value #t))
    (expect-failure            (value #t)) ;XXX: not implemented yet
    (enable-hard-errors        (value #t)) ;not implemented in SRFI-64
    (brief                     (value #t))
    (help    (single-char #\h) (value #f))
    (version (single-char #\V) (value #f))))

(define (option->boolean options key)
  "Return #t if the value associated with KEY in OPTIONS is \"yes\"."
  (and=> (option-ref options key #f) (cut string=? <> "yes")))

(define* (test-display field value  #:optional (port (current-output-port))
                       #:key pretty?)
  "Display \"FIELD: VALUE\\n\" on PORT."
  (if pretty?
      (begin
        (format port "~A:~%" field)
        (pretty-print value port #:per-line-prefix "+ "))
      (format port "~A: ~S~%" field value)))

(define* (result->string symbol #:key colorize?)
  "Return SYMBOL as an upper case string.  Use colors when COLORIZE is #t."
  (let ((result (string-upcase (symbol->string symbol))))
    (if colorize?
        (string-append (case symbol
                         ((pass)       "")  ;green
                         ((xfail)      "")  ;light green
                         ((skip)       "")  ;blue
                         ((fail xpass) "")  ;red
                         ((error)      "")) ;magenta
                       result
                       "")          ;no color
        result)))

(define* (test-runner-gnu test-name #:key color? brief? out-port trs-port)
  "Return an custom SRFI-64 test runner.  TEST-NAME is a string specifying the
file name of the current the test.  COLOR? specifies whether to use colors,
and BRIEF?, well, you know.  OUT-PORT and TRS-PORT must be output ports.  The
current output port is supposed to be redirected to a '.log' file."

  (define (test-on-test-begin-gnu runner)
    ;; Procedure called at the start of an individual test case, before the
    ;; test expression (and expected value) are evaluated.
    (let ((result (cute assq-ref (test-result-alist runner) <>)))
      (format #t "test-name: ~A~%" (result 'test-name))
      (format #t "location: ~A~%"
              (string-append (result 'source-file) ":"
                             (number->string (result 'source-line))))
      (test-display "source" (result 'source-form) #:pretty? #t)))

  (define (test-on-test-end-gnu runner)
    ;; Procedure called at the end of an individual test case, when the result
    ;; of the test is available.
    (let* ((results (test-result-alist runner))
           (result? (cut assq <> results))
           (result  (cut assq-ref results <>)))
      (unless brief?
        ;; Display the result of each test case on the console.
        (format out-port "~A: ~A - ~A~%"
                (result->string (test-result-kind runner) #:colorize? color?)
                test-name (test-runner-test-name runner)))
      (when (result? 'expected-value)
        (test-display "expected-value" (result 'expected-value)))
      (when (result? 'expected-error)
        (test-display "expected-error" (result 'expected-error) #:pretty? #t))
      (when (result? 'actual-value)
        (test-display "actual-value" (result 'actual-value)))
      (when (result? 'actual-error)
        (test-display "actual-error" (result 'actual-error) #:pretty? #t))
      (format #t "result: ~a~%" (result->string (result 'result-kind)))
      (newline)
      (format trs-port ":test-result: ~A ~A~%"
              (result->string (test-result-kind runner))
              (test-runner-test-name runner))))

  (define (test-on-group-end-gnu runner)
    ;; Procedure called by a 'test-end', including at the end of a test-group.
    (let ((fail (or (positive? (test-runner-fail-count runner))
                    (positive? (test-runner-xpass-count runner))))
          (skip (or (positive? (test-runner-skip-count runner))
                    (positive? (test-runner-xfail-count runner)))))
      ;; XXX: The global results need some refinements for XPASS.
      (format trs-port ":global-test-result: ~A~%"
              (if fail "FAIL" (if skip "SKIP" "PASS")))
      (format trs-port ":recheck: ~A~%"
              (if fail "yes" "no"))
      (format trs-port ":copy-in-global-log: ~A~%"
              (if (or fail skip) "yes" "no"))
      (when brief?
        ;; Display the global test group result on the console.
        (format out-port "~A: ~A~%"
                (result->string (if fail 'fail (if skip 'skip 'pass))
                                #:colorize? color?)
                test-name))
      #f))

  (let ((runner (test-runner-null)))
    (test-runner-on-test-begin! runner test-on-test-begin-gnu)
    (test-runner-on-test-end! runner test-on-test-end-gnu)
    (test-runner-on-group-end! runner test-on-group-end-gnu)
    (test-runner-on-bad-end-name! runner test-on-bad-end-name-simple)
    runner))


;;;
;;; Entry point.
;;;

(define (main . args)
  (let* ((opts   (getopt-long (command-line) %options))
         (option (cut option-ref opts <> <>)))
    (cond
     ((option 'help #f)    (show-help))
     ((option 'version #f) (format #t "test-driver.scm ~A" script-version))
     (else
      (let ((log (open-file (option 'log-file "") "w0"))
            (trs (open-file (option 'trs-file "") "wl"))
            (out (duplicate-port (current-output-port) "wl")))
        (redirect-port log (current-output-port))
        (redirect-port log (current-warning-port))
        (redirect-port log (current-error-port))
        (test-with-runner
            (test-runner-gnu (option 'test-name #f)
                             #:color? (option->boolean opts 'color-tests)
                             #:brief? (option->boolean opts 'brief)
                             #:out-port out #:trs-port trs)
          (load-from-path (option 'test-name #f)))
        (close-port log)
        (close-port trs)
        (close-port out))))
    (exit 0)))

;;; Local Variables:
;;; eval: (add-hook 'write-file-functions 'time-stamp)
;;; time-stamp-start: "(define script-version \""
;;; time-stamp-format: "%:y-%02m-%02d.%02H"
;;; time-stamp-time-zone: "UTC"
;;; time-stamp-end: "\") ;UTC"
;;; End:

;;;; test-driver.scm ends here.