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+;;;; mcron -- run jobs at scheduled times
+;;; Copyright © 2003, 2012 Dale Mellor <dale_mellor@users.sourceforge.net>
+;;; Copyright © 2015, 2016 Mathieu Lirzin <mthl@gnu.org>
+;;;
+;;; This file is part of GNU Mcron.
+;;;
+;;; GNU Mcron 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 Mcron 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 Mcron.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (mcron scripts mcron)
+  #:use-module (mcron base)
+  #:use-module (mcron config)
+  #:use-module (mcron job-specifier)    ;for user/system files
+  #:use-module (mcron main)
+  #:use-module (mcron vixie-specification)
+  #:export (main))
+
+(define (show-help)
+  (display "Usage: mcron [OPTIONS] [FILES]
+Run an mcron process according to the specifications in the FILES (`-' for
+standard input), or use all the files in ~/.config/cron (or the
+deprecated ~/.cron) with .guile or .vixie extensions.
+
+  -v, --version             Display version
+  -h, --help                Display this help message
+  -sN, --schedule[=]N       Display the next N jobs that will be run by mcron
+  -d, --daemon              Immediately detach the program from the terminal
+                              and run as a daemon process
+  -i, --stdin=(guile|vixie) Format of data passed as standard input or
+                              file arguments (default guile)")
+  (newline)
+  (show-package-information))
+
+(define %options
+  `((schedule (single-char #\s) (value #t)
+              (predicate ,(λ (str) (string->number str))))
+    (daemon   (single-char #\d) (value #f))
+    (noetc    (single-char #\n) (value #f))
+    (stdin    (single-char #\i) (value #t)
+              (predicate ,(λ (val)
+                            (or (string=? val "guile")
+                                (string=? val "vixie")))))
+    (version  (single-char #\v) (value #f))
+    (help     (single-char #\h) (value #f))))
+
+(define process-user-file
+  (let ((guile-regexp (make-regexp "\\.gui(le)?$"))
+        (vixie-regexp (make-regexp "\\.vix(ie)?$")))
+    (lambda* (file-name #:optional guile-syntax? #:key (input "guile"))
+      "Process FILE-NAME according its extension.  When GUILE-SYNTAX? is TRUE,
+force guile syntax usage.  If FILE-NAME format is not recognized, it is
+silently ignored."
+      (cond ((string=? "-" file-name)
+             (if (string=? input "vixie")
+                 (read-vixie-port (current-input-port))
+                 (eval-string (stdin->string))))
+            ((or guile-syntax? (regexp-exec guile-regexp file-name))
+             (load file-name))
+            ((regexp-exec vixie-regexp file-name)
+             (read-vixie-file file-name))))))
+
+(define (process-files-in-user-directory input-type)
+  "Process files in $XDG_CONFIG_HOME/cron and/or ~/.cron directories (if
+$XDG_CONFIG_HOME is not defined uses ~/.config/cron instead)."
+  (let ((errors 0)
+        (home-directory (passwd:dir (getpw (getuid)))))
+    (map (λ (dir)
+           (catch #t
+             (λ ()
+               (for-each-file
+                (λ (file)
+                  (process-user-file (string-append dir "/" file)
+                                     #:input input-type))
+                dir))
+             (λ (key . args)
+               (set! errors (1+ errors)))))
+         (list (string-append home-directory "/.cron")
+               (string-append (or (getenv "XDG_CONFIG_HOME")
+                                  (string-append home-directory "/.config"))
+                              "/cron")))
+    (when (eq? 2 errors)
+      (mcron-error 13
+        "Cannot read files in your ~/.config/cron (or ~/.cron) directory."))))
+
+(define (%process-files files input-type)
+  (if (null? files)
+      (process-files-in-user-directory input-type)
+      (for-each (λ (file) (process-user-file file #t)) files)))
+
+
+;;;
+;;; Entry point.
+;;;
+
+(define* (main #:optional (args (command-line)))
+  (let ((opts (parse-args args %options)))
+    (when config-debug
+      (debug-enable 'backtrace))
+    (cond ((option-ref opts 'help #f)
+           (show-help)
+           (exit 0))
+          ((option-ref opts 'version #f)
+           (show-version "mcron")
+           (exit 0))
+          (else
+           (%process-files (option-ref opts '() '())
+                           (option-ref opts 'stdin "guile"))
+           (cond ((option-ref opts 'schedule #f) ;display jobs schedule
+                  => (λ (count)
+                       (display (get-schedule (max 1 (string->number count))))
+                       (exit 0)))
+                 ((option-ref opts 'daemon #f) ;run mcron as a daemon
+                  (case (primitive-fork)
+                    ((0)  (setsid))
+                    (else (exit 0)))))
+           ;; Forever execute the 'run-job-loop', and when it drops out (can
+           ;; only be because a message has come in on the socket) we process
+           ;; the socket request before restarting the loop again.
+           (catch-mcron-error
+            (let ((fdes-list '()))
+              (while #t
+                (run-job-loop fdes-list)
+                ;; we can also drop out of run-job-loop because of a SIGCHLD,
+                ;; so must test FDES-LIST.
+                (unless (null? fdes-list)
+                  (process-update-request fdes-list)))))))))