From 23eae115e404fd11eda3b293eb4e0fc34ae9b3a6 Mon Sep 17 00:00:00 2001
From: Olof-Joachim Frahm <olof@macrolet.net>
Date: Fri, 29 Mar 2013 01:28:19 +0100
Subject: [PATCH] Add iolib functions.

For the moment unexported, more as an example.
---
 cl-inotify.asd |    1 +
 iolib.lisp     |   89 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 90 insertions(+)
 create mode 100644 iolib.lisp

diff --git a/cl-inotify.asd b/cl-inotify.asd
index be8a031..354b85c 100644
--- a/cl-inotify.asd
+++ b/cl-inotify.asd
@@ -40,6 +40,7 @@
                #:binary-types
                #:trivial-utf-8
                #:osicat)
+  :weakly-depends-on (#:iolib)
   :serial T
   :components ((:file "package")
                (cffi-grovel:grovel-file "grovel")
diff --git a/iolib.lisp b/iolib.lisp
new file mode 100644
index 0000000..948aba6
--- /dev/null
+++ b/iolib.lisp
@@ -0,0 +1,89 @@
+;;; -*- mode: lisp; syntax: common-lisp; coding: utf-8-unix; package: cl-inotify; -*-
+
+;; Copyright (c) 2011-12, Olof-Joachim Frahm
+;; All rights reserved.
+
+;; Redistribution and use in source and binary forms, with or without
+;; modification, are permitted provided that the following conditions
+;; are met:
+
+;; 1. Redistributions of source code must retain the above copyright
+;; notice, this list of conditions and the following disclaimer.
+
+;; 2. Redistributions in binary form must reproduce the above copyright
+;; notice, this list of conditions and the following disclaimer in the
+;; documentation and/or other materials provided with the distribution.
+
+;; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+;; "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+;; LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+;; A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+;; OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+;; SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+;; LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+;; DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+;; THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+;; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+;; OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+(in-package #:cl-inotify)
+
+(defun run-inotify-event-handler (watch event-handler &key (nonblocking T) (registered T))
+  "Registers an INOTIFY queue and runs EVENT-HANDLER with it as only
+parameter whenever input happens."
+  (let ((inotify (funcall (if registered #'make-inotify #'make-unregistered-inotify) nonblocking)))
+    (unwind-protect
+         (iolib:with-event-base (event-base)
+           (dolist (watch watch)
+             (apply #'watch inotify watch))
+           (flet ((events (&rest args)
+                    (declare (ignore args))
+                    (do-events (event inotify :blocking-p NIL)
+                      (funcall event-handler inotify event))))
+             (iolib:set-io-handler event-base (inotify-fd inotify) :read #'events)
+             (iolib:event-dispatch event-base)))
+      (close-inotify inotify))))
+
+(defun run-inotify-program (program args rest directories flags
+                            &key event-handler (registered T))
+  "Runs a program and records all matched events in all DIRECTORIES using
+FLAGS.  If EVENT-HANDLER is set, it is instead called with every available
+event.
+
+PROGRAM, ARGS and REST are the arguments to SB-EXT:RUN-PROGRAM.  REST is
+passed on verbatim except for the WAIT parameter, which is set to false.
+
+PROGRAM may also be a FUNCTION, in which case it is called with
+\(ARGS . REST) as arguments and has to return a process object like from
+SB-EXT:RUN-PROGRAM.  The process also shouldn't be spawned with WAIT set.
+
+DIRECTORIES is a list of directory arguments for WATCH/-RAW.
+
+Returns the process structure and if EVENT-HANDLER wasn't set, a LIST of
+recorded events as second value."
+  (let (events)
+    (flet ((events (inotify)
+             (do-events (event inotify)
+               (if event-handler
+                   (funcall event-handler event)
+                   (push event events)))))
+      (let ((inotify (if registered (make-inotify) (make-unregistered-inotify))))
+        (unwind-protect
+             (progn
+               (let ((register (if registered #'watch #'watch-raw)))
+                 (mapcar (lambda (directory)
+                           (funcall register inotify directory flags))
+                         directories))
+               (let ((process (etypecase program
+                                (string
+                                 (apply #'sb-ext:run-program program args :wait NIL rest))
+                                (function
+                                 (apply program args rest)))))
+                 (loop
+                   while (sb-ext:process-alive-p process)
+                   do (events inotify))
+                 (events inotify)
+                 (if event-handler
+                     process
+                     (values process (nreverse events)))))
+          (close-inotify inotify))))))
-- 
1.7.10.4