Storage of page history implemented

pages/messages.py

@@ -10,3 +10,13 @@ def permission_denied_msg_page(request, rel_path):
 def unavailable_msg_page(request, rel_path):
     # TODO: Add translation for this message
     messages.info(request, _("Unavailable: The Page '%s' is not available. Create it or follow a valid link, please.") % rel_path)
+
+
+def edit_success(request):
+    # TODO: Add translation for this message
+    messages.success(request, _('Thanks for editing, page stored.'))
+
+
+def edit_no_change(request):
+    # TODO: Add translation for this message
+    messages.info(request, _("Nothing changed, no storage needed."))

pages/page.py

@@ -7,6 +7,7 @@ import logging
 from pages import messages, url_page
 import mycreole
 import os
+import shutil
 import time
 from users.models import get_userprofile
 import zoneinfo
@@ -53,6 +54,7 @@ class meta_data(dict):
 class base_page(object):
     PAGE_FILE_NAME = 'page'
     META_FILE_NAME = 'meta.json'
+    HISTORY_FOLDER_NAME = 'history'
     SPLITCHAR = ":"
 
     def __init__(self, path):
@@ -72,17 +74,37 @@ class base_page(object):
             except FileNotFoundError:
                 self._raw_page_src = ""
 
+    def _store_history(self):
+        history_folder = os.path.join(self._path, self.HISTORY_FOLDER_NAME)
+        # create folder if needed
+        fstools.mkdir(history_folder)
+        # identify last_history number
+        flist = fstools.filelist(history_folder)
+        flist.sort()
+        if flist:
+            hist_number = int(os.path.basename(flist[-1])[:5]) + 1
+        else:
+            hist_number = 1
+        # copy file to history folder
+        shutil.copy(self.filename, os.path.join(history_folder, "%05d_%s" % (hist_number, self.PAGE_FILE_NAME)))
+        shutil.copy(self._meta_filename, os.path.join(history_folder, "%05d_%s" % (hist_number, self.META_FILE_NAME)))
+
     def update_page(self, page_txt):
         from .search import update_item
-        #
-        folder = os.path.dirname(self.filename)
-        if not os.path.exists(folder):
-            fstools.mkdir(folder)
+        if page_txt.replace("\r\n", "\n") != self.raw_page_src:
+            # Store page history
+            if self.raw_page_src:
+                self._store_history()
+            # save the new page content
+            fstools.mkdir(os.path.dirname(self.filename))
             with open(self.filename, 'w') as fh:
                 fh.write(page_txt)
+            # update search index
             update_item(self)
-        #
+            # update metadata
             self._update_metadata()
+            return True
+        return False
 
     @property
     def filename(self):

pages/views.py

@@ -75,7 +75,10 @@ def edit(request, rel_path):
             preview = request.POST.get("preview")
             #
             if save is not None:
-                p.update_page(page_txt)
+                if p.update_page(page_txt):
+                    messages.edit_success(request)
+                else:
+                    messages.edit_no_change(request)
                 return HttpResponseRedirect(url_page(request, rel_path))
             elif preview is not None:
                 form = EditForm(page_data=page_txt)