# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1358608717 -3600
# Node ID 6659510890acfc164a272068e14a93658d416f81
# Parent  367c9d96bc2aff275adf9044ca0f4fe60dda8111
Added support for page-specific item storage.

diff -r 367c9d96bc2a -r 6659510890ac MoinSupport.py
--- a/MoinSupport.py	Sat Jan 19 16:08:29 2013 +0100
+++ b/MoinSupport.py	Sat Jan 19 16:18:37 2013 +0100
@@ -10,11 +10,13 @@
 
 from DateSupport import *
 from MoinMoin.Page import Page
+from MoinMoin.util import lock
 from MoinMoin import config, search, wikiutil
 from StringIO import StringIO
 from shlex import shlex
 import re
 import time
+import os
 
 # Moin 1.9 request parameters.
 
@@ -868,4 +870,83 @@
     else:
         return title
 
+# Content storage support.
+
+class ItemStore:
+
+    "A page-specific item store."
+
+    def __init__(self, page, item_dir_name="items", lock_dir_name="item-locks"):
+
+        "Initialise an item store for the given 'page'."
+
+        self.path = page.getPagePath(item_dir_name)
+        self.next_path = os.path.join(self.path, "next")
+        lock_dir = page.getPagePath(lock_dir_name)
+        self.lock = lock.WriteLock(lock_dir)
+
+    def get_next(self):
+
+        "Return the next item number."
+
+        next = self.read_next()
+        if not next:
+            next = self.deduce_next()
+            self.write_next(next)
+        return next
+
+    def deduce_next(self):
+
+        "Deduce the next item number from the existing item files."
+
+        return max([int(filename) for filename in os.listdir(self.path) if filename.isdigit()] or [0]) + 1
+
+    def read_next(self):
+
+        "Read the next item number from a special file."
+
+        if not os.path.exists(self.next_path):
+            return 0
+
+        f = open(self.next_path)
+        try:
+            try:
+                return int(f.read())
+            except ValueError:
+                return 0
+        finally:
+            f.close()
+
+    def write_next(self, next):
+
+        "Write the 'next' item number to a special file."
+
+        f = open(self.next_path, "w")
+        try:
+            f.write(str(next))
+        finally:
+            f.close()
+
+    def write_item(self, item, next):
+
+        "Write the given 'item' to a file with the given 'next' item number."
+
+        f = open(os.path.join(self.path, str(next)), "w")
+        try:
+            f.write(item.as_string())
+        finally:
+            f.close()
+
+    def append(self, item):
+
+        "Append the given 'item' to the store."
+
+        self.lock.acquire()
+        try:
+            next = self.get_next()
+            self.write_item(item, next)
+            self.write_next(next + 1)
+        finally:
+            self.lock.release()
+
 # vim: tabstop=4 expandtab shiftwidth=4
diff -r 367c9d96bc2a -r 6659510890ac README.txt
--- a/README.txt	Sat Jan 19 16:08:29 2013 +0100
+++ b/README.txt	Sat Jan 19 16:18:37 2013 +0100
@@ -86,6 +86,7 @@
     be generated for formatted text.
   * Added various content/media type functions from EventAggregator and other
     projects to ContentTypeSupport.
+  * Added support for page-specific item storage in MoinSupport.
 
 Release Procedures
 ------------------