Add (cuirass logging) module.

* src/cuirass/logging.scm: New file.
* Makefile.am (dist_pkgmodule_DATA): Add it.
* src/cuirass/base.scm (handle-build-event): Use 'log-message' instead
of 'log'.

1 files changed, 48 insertions, 0 deletions

diff --git a/src/cuirass/logging.scm b/src/cuirass/logging.scm
new file mode 100644
index 0000000..bd1eed3
--- /dev/null
+++ b/src/cuirass/logging.scm
@@ -0,0 +1,48 @@
+;;; logging.scm -- Event logging.
+;;; Copyright © 2018 Ludovic Courtès <ludo@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 logging)
+  #:use-module (srfi srfi-19)
+  #:use-module (ice-9 format)
+  #:export (current-logging-port
+            current-logging-procedure
+            log-message))
+
+(define current-logging-port
+  (make-parameter (current-error-port)))
+
+(define (log-to-port port str)
+  (define now
+    (current-time time-utc))
+
+  (define date
+    (date->string (time-utc->date now) "~5"))
+
+  (display (string-append date " " str "\n")
+           port))
+
+(define current-logging-procedure
+  ;; The logging procedure.  This could be 'syslog', for instance.
+  (make-parameter (lambda (str)
+                    (log-to-port (current-logging-port) str))))
+
+(define-syntax-rule (log-message fmt args ...)
+  "Log the given message as one line."
+  ;; Note: Use '@' to make sure -Wformat detects this use of 'format'.
+  ((current-logging-procedure)
+   ((@ (ice-9 format) format) #f fmt args ...)))