Created a state system. See

http://groups.google.com/group/evennia/browse_thread/thread/66a7ff6cce5303b7
for more detailed description.

Created a new folder gamesrc/commands/examples and moved all examples in there.
/Griatch

game/gamesrc/commands/examples/example.py

@@ -4,16 +4,16 @@ in action.
 
 You'll need to make sure that this or any new modules you create are added to
 game/settings.py under CUSTOM_COMMAND_MODULES or CUSTOM_UNLOGGED_COMMAND_MODULES,
-which are tuples of module import path strings.
-See src/config_defaults.py for more details.
+which are tuples of module import path strings. See src/config_defaults.py for more details.
 
 E.g. to add this example command for testing, your entry in game/settings.py would
 look like this:
 
-CUSTOM_COMMAND_MODULES = ('game.gamesrc.commands.example',)
+CUSTOM_COMMAND_MODULES = ('game.gamesrc.commands.examples.example',)
 
 (note the extra comma at the end to make this into a Python tuple. It's only
-needed if you have only one entry.)
+needed if you have only one entry.) You need to restart the Evennia server before new
+files are recognized. 
 
 """
 
@@ -70,8 +70,6 @@ def cmd_example(command):
 # automatically be created for us.
 GLOBAL_CMD_TABLE.add_command("example", cmd_example, auto_help=True),
 
-
-
 #another simple example
 
 def cmd_emote_smile(command):
@@ -92,3 +90,7 @@ def cmd_emote_smile(command):
 #add to global command table (no auto_help activated)
 GLOBAL_CMD_TABLE.add_command('smile', cmd_emote_smile)
 
+
+
+
+

game/gamesrc/commands/examples/state_example.py

@@ -0,0 +1,112 @@
+"""
+Example of using the state system. The Event system allows a player object to be
+'trapped' in a special environment where different commands are available than normal.
+This is very useful in order to implement anything from menus to npc-conversational
+choices and inline text-editors. 
+
+This example uses the State system to create a simple menu. 
+
+To test out this example, add this module to the CUSTOM_COMMAND_MODULES tuple in
+your game/settings.py as 'game.gamesrc.commands.examples.state_example' (see ./example.py
+for another example). You need to restart the Evennia server before new files are
+recognized. 
+
+Next enter the mud and give the command
+> entermenu
+
+Note that the help entries added to the state system with the auto_help flag are NOT
+part of the normal help database, they are stored with the state and only accessible
+from inside it (unless you also set the 'global_help' flag in the add_command(), in
+which case it is also added to the global help system). If you want to describe the
+state itself in more detail you should add that to the main help index manually. 
+"""
+
+#This is the normal command table, accessible by default
+from src.cmdtable import GLOBAL_CMD_TABLE
+
+#The statetable contains sets of cmdtables that is made available
+#only when we are in a particular state, overriding the GLOBAL_CMD_TABLE
+from src.statetable import GLOBAL_STATE_TABLE
+
+#
+# Implementing a simple 'menu' state
+#
+
+#the name of our state, to make sure it's the same everywhere
+STATENAME = 'menu'
+
+
+#
+# 'entry' command
+#    
+def cmd_entermenu(command):
+    """
+    This is the 'entry' command that takes the player from the normal    
+    gameplay mode into the 'menu' state. In order to do this, it
+    must be added to the GLOBAL_CMD_TABLE like any command.
+    """
+    #get the player object calling the command    
+    source_object = command.source_object    
+    #this is important: we use the set_state() command
+    #to shift the player into a state named 'menu'.
+    source_object.set_state(STATENAME)
+    #display the menu.
+    print_menu(source_object)    
+
+#
+# Commands only available while in the 'menu' state. Note that
+#  these have auto_help, so the __doc__ strings of the functions
+#  can be read as help entries when in the menu. 
+#
+def menu_cmd_option1(command):
+    """option1
+    This selects the first option.
+    """
+    source_object = command.source_object
+    print_menu(source_object, 1)
+def menu_cmd_option2(command):
+    """option2
+    This selects the second option. Duh.
+
+    <<TOPIC:About>>
+    This is an extra topic to test the auto_help functionality.
+    """
+    source_object = command.source_object
+    print_menu(source_object, 2)
+def menu_cmd_clear(command):
+    """clear
+    Clears the options.  
+    """
+    source_object = command.source_object
+    print_menu(source_object)
+
+#
+# helper function
+#
+def print_menu(source_obj,choice=None):
+    """
+    Utility function to print the menu. More interesting things
+    would happen here in a real menu. 
+    """
+    if choice==1:
+        ch = "> option1\n  option2"
+    elif choice==2:
+        ch = "  option1\n> option2"
+    else:
+        ch = "  option1\n  option2"
+        
+    s ="Menu---------\n%s\n  help - get help" % ch
+    source_obj.emit_to(s)
+
+
+
+#Add the 'entry' command to the normal command table
+GLOBAL_CMD_TABLE.add_command("entermenu", cmd_entermenu)
+
+#Add the menu commands to the state table by tying them to the 'menu' state. It is
+#important that the name of the state matches what we set the player-object to in
+#the 'entry' command. Since auto_help is on, we will have help entries for all commands
+#while in the menu.
+GLOBAL_STATE_TABLE.add_command(STATENAME, "option1", menu_cmd_option1,auto_help=True)
+GLOBAL_STATE_TABLE.add_command(STATENAME, "option2", menu_cmd_option2,auto_help=True)
+GLOBAL_STATE_TABLE.add_command(STATENAME, "clear", menu_cmd_clear,auto_help=True)

src/cmdhandler.py

@@ -8,6 +8,7 @@ from traceback import format_exc
 from django.contrib.contenttypes.models import ContentType
 import defines_global
 import cmdtable
+import statetable
 import logger
 import comsys
 import alias_mgr
@@ -318,19 +319,40 @@ def handle(command):
             # Not logged in, look through the unlogged-in command table.
             command_table_lookup(command, cmdtable.GLOBAL_UNCON_CMD_TABLE, 
                                  eval_perms=False)
-        else:
-            # Match against the 'idle' command.
-            match_idle(command)
-            # See if this is an aliased command.
-            match_alias(command)
-            # Check if the user is using a channel command.
-            match_channel(command)
-            # See if the user is trying to traverse an exit.
-            match_exits(command)
-            neighbor_match_found = match_neighbor_ctables(command)
-            if not neighbor_match_found:
-                # Retrieve the appropriate (if any) command function.
-                command_table_lookup(command, cmdtable.GLOBAL_CMD_TABLE)
+        
+        else:        
+
+            state_name = command.source_object.get_state()
+            state_cmd_table = statetable.GLOBAL_STATE_TABLE.get_cmd_table(state_name)            
+
+            if state_name and state_cmd_table:
+                # we are in a special state.
+
+                # check idle command.  
+                match_idle(command)
+                # check for channel commands
+                prev_command = command.command_string
+                match_channel(command)
+                if prev_command != command.command_string:
+                    # a channel command is handled normally also in the state
+                    command_table_lookup(command, cmdtable.GLOBAL_CMD_TABLE)
+                else: 
+                    command_table_lookup(command, state_cmd_table)                           
+            else:
+                #normal operation
+
+                # Match against the 'idle' command.            
+                match_idle(command)
+                # See if this is an aliased command.
+                match_alias(command)
+                # Check if the user is using a channel command.
+                match_channel(command)
+                # See if the user is trying to traverse an exit.
+                match_exits(command)
+                neighbor_match_found = match_neighbor_ctables(command)
+                if not neighbor_match_found:
+                     # Retrieve the appropriate (if any) command function.
+                     command_table_lookup(command, cmdtable.GLOBAL_CMD_TABLE)
         
         """
         By this point, we assume that the user has entered a command and not

src/cmdtable.py

@@ -1,6 +1,6 @@
 """
 Command Table Module
----------------------
+
 Each command entry consists of a key and a tuple containing a reference to the
 command's function, and a tuple of the permissions to match against. The user
 only need have one of the permissions in the permissions tuple to gain
@@ -19,7 +19,7 @@ from src.helpsys.management.commands.edit_helpfiles import add_help
 
 class CommandTable(object):
     """
-    Stores command tables and performs lookups.
+    Stores commands and performs lookups.
     """
     ctable = None
     
@@ -28,7 +28,7 @@ class CommandTable(object):
         self.ctable = {}
     
     def add_command(self, command_string, function, priv_tuple=None,
-                    extra_vals=None, auto_help=False, staff_only=False):
+                    extra_vals=None, auto_help=False, staff_help=False, state=None):
         """
         Adds a command to the command table.
         
@@ -41,7 +41,7 @@ class CommandTable(object):
         auto_help (bool): If true, automatically creates/replaces a help topic with the
                     same name as the command_string, using the functions's __doc__ property
                     for help text. 
-        staff_help (bool): Only relevant if help_auto is activated; It True, makes the
+        staff_help (bool): Only relevant if auto_help is activated; If True, makes the
                      help topic (and all eventual subtopics) only visible to staff.
 
         Note: the auto_help system also supports limited markup. If you divide your __doc__
@@ -57,7 +57,7 @@ class CommandTable(object):
             #add automatic help text from the command's doc string            
             topicstr = command_string
             entrytext = function.__doc__
-            add_help(topicstr, entrytext, staff_only=staff_only,
+            add_help(topicstr, entrytext, staff_only=staff_help,
                      force_create=True, auto_help=True)
                         
     def get_command_tuple(self, func_name):
@@ -67,6 +67,7 @@ class CommandTable(object):
         """
         return self.ctable.get(func_name, False)
 
+
 """
 Command tables
 """

src/commands/objmanip.py

@@ -867,7 +867,7 @@ def cmd_recover(command):
 
 
 GLOBAL_CMD_TABLE.add_command("@recover", cmd_recover,
-                             priv_tuple=("genperms.builder"),auto_help=True,staff_only=True)
+                             priv_tuple=("genperms.builder"),auto_help=True,staff_help=True)
 
 def cmd_destroy(command):
     """
@@ -943,4 +943,4 @@ def cmd_destroy(command):
             source_object.emit_to("You schedule %s for destruction." % target_obj.get_name())
         
 GLOBAL_CMD_TABLE.add_command("@destroy", cmd_destroy,
-                             priv_tuple=("genperms.builder"),auto_help=True,staff_only=True)
+                             priv_tuple=("genperms.builder"),auto_help=True,staff_help=True)

src/helpsys/management/commands/edit_helpfiles.py

@@ -67,7 +67,7 @@ def _create_help(topicstr, entrytext, staff_only=False, force_create=False,
         new_entry.save()
         return [new_entry]
 
-def _handle_help_markup(topicstr, entrytext, staff_only, identifier="<<TOPIC:"):
+def handle_help_markup(topicstr, entrytext, staff_only, identifier="<<TOPIC:"):
     """
     Handle help markup in order to split help into subsections.
     Handles markup of the form <<TOPIC:STAFF:TopicTitle>> and
@@ -103,7 +103,7 @@ def _handle_help_markup(topicstr, entrytext, staff_only, identifier="<<TOPIC:"):
             staff_dict[topic] = staff_only
     return topic_dict, staff_dict
 
-def _format_footer(top, text, topic_dict, staff_dict):
+def format_footer(top, text, topic_dict, staff_dict):
     """
     Formats the subtopic with a 'Related Topics:' footer. If mixed
     staff-only flags are set, those help entries without the staff-only flag
@@ -147,13 +147,13 @@ def add_help(topicstr, entrytext, staff_only=False, force_create=False,
     identifier = '<<TOPIC:'
     if identifier in entrytext:        
         #There is markup in the entry, so we should split the doc into separate subtopics        
-        topic_dict, staff_dict = _handle_help_markup(topicstr, entrytext,
+        topic_dict, staff_dict = handle_help_markup(topicstr, entrytext,
                                                      staff_only, identifier)
         topics = []
         for topic, text in topic_dict.items():            
 
             #format with nice footer
-            entry = _format_footer(topic, text, topic_dict, staff_dict)
+            entry = format_footer(topic, text, topic_dict, staff_dict)
 
             if entry:                
                 #create the subtopic

src/objects/models.py

@@ -117,6 +117,10 @@ class Object(models.Model):
     
     objects = ObjectManager()
 
+    #state system can set a particular command table to be used.
+    state = None
+
+
     def __cmp__(self, other):
         """
         Used to figure out if one object is the same as another.
@@ -981,5 +985,21 @@ class Object(models.Model):
         otype = int(self.type)
         return defines_global.OBJECT_TYPES[otype][1][0]
 
+
+    def get_state(self):
+        return self.state
+    
+    def set_state(self, cmd_table=None):
+        """
+        Set the state by defining which cmd_table is currently used.
+        """
+        if self.is_player():            
+            self.state = cmd_table
+
+    def clear_state(self):
+        self.state = None
+
+
+
 # Deferred imports are poopy. This will require some thought to fix.
 from src import cmdhandler

src/statetable.py

@@ -0,0 +1,228 @@
+"""
+The state system allows the player to enter a state where only a special set of commands
+are available. This can be used for all sorts of useful things:
+  - in-game menus (picking an option from a list)
+  - inline text editors (entering text into a buffer)
+  - npc conversation (select replies)
+  - commands only available while in 'combat mode' etc  
+This allows for more power than using rooms to build 'menus'. 
+
+Basically the GLOBAL_STATE_TABLE contains a dict with command tables keyed after the
+name of the state. To use, a function must set the 'state' variable on a player object
+using the obj.set_state() function. The GLOBAL_STATE_TABLE will then be searched by the
+command handler and if the state is defined its command table is used instead
+of the normal global command table.
+
+The state system is pluggable, in the same way that commands are added to the global command
+table, commands are added to the GLOBAL_STATE_TABLE using add_command supplying in
+addition the name of the state. 
+"""
+
+from cmdtable import CommandTable
+from logger import log_errmsg
+import src.helpsys.management.commands.edit_helpfiles as edit_help
+
+
+class StateTable(object):
+
+    state_table = None
+
+    def __init__(self):
+        self.state_table = {}
+        self.help_index = StateHelpIndex()
+        
+    def add_command(self, state_name, command_string, function, priv_tuple=None,
+                    extra_vals=None, auto_help=False, staff_help=False, help_global=False,
+                    exit_command=True):
+        """
+        Access function; transparently add commands to a specific command table to
+        reprsent a particular state. This command is similar to the normal
+        command_table.add_command() function. See example in gamesrc/commands/examples.
+
+        command_string: (str) command name to run, like look, @list etc
+        function: (reference) command function object
+        state_name: (str) identifier of the state we tie this to.
+        priv_tuple: (tuple) String tuple of permissions required for command.
+        extra_vals: (dict) Dictionary to add to the Command object.        
+        
+        auto_help: (bool) Activate the auto_help system. By default this stores the
+               help inside the statetable only (not in the main help database), and so
+               the help entries are only available when the player is actually inside
+               the state. Note that the auto_help system of state-commands do not
+               support <<TOPIC:mytitle>> markup. 
+        staff_help: (bool) Help entry is only available for staff players.
+        help_global: (bool) Also auto_add the help entry to the main help database. Be
+               careful with overwriting same-named help topics if you define special
+               versions of commands inside your state. 
+
+        exit_command: (bool) Sets if the default @exit command is added to the state. Only
+               one command needs to include this statement in order to add @exit. This is
+               usually a good idea to make sure the player is not stuck, but you might want
+               to turn this off if you know what you're doing and want to avoid players
+               'escaping' the state (like in a combat state or similar), or when
+               you need to do some special final cleanup or save operations before
+               exiting (like in a text editor). 
+        """
+
+        if not state_name:
+            log_errmsg("Command %s was not given a state. Not added." % command_string)
+            return 
+
+        state_name = state_name.strip()
+        if not self.state_table.has_key(state_name):
+
+            #create the state
+            self.state_table[state_name] = CommandTable()        
+            #always add a help index even though it might not be used.
+            self.help_index.add_state(state_name)
+
+            if exit_command:                
+                #add the @exit command
+                self.state_table[state_name].add_command("@exit",
+                                                         cmd_state_exit,
+                                                         auto_help=True)            
+                if auto_help:
+                    #add help for @exit command
+                    self.help_index.add_state_help(state_name, "@exit",
+                                                   cmd_state_exit.__doc__)        
+
+        #handle auto-help for the state
+        if auto_help:            
+
+            #make sure the state's help command is in place           
+            self.state_table[state_name].add_command('help',cmd_state_help)
+
+            #add the help text
+            helptext = function.__doc__
+            self.help_index.add_state_help(state_name,command_string,
+                                           helptext,staff_only=staff_help)    
+            if not help_global:
+                #if we don't want global help access, we need to
+                #turn off auto_help before adding the command.
+                auto_help = False                
+            
+        #finally add the new command to the state                        
+        self.state_table[state_name].add_command(command_string,
+                                                     function, priv_tuple,
+                                                     extra_vals,auto_help,
+                                                     staff_help)        
+            
+    def get_cmd_table(self, state_name):
+        """
+        Return the command table for a particular state.
+        """
+        if self.state_table.has_key(state_name):
+            return self.state_table[state_name]
+        else:
+            return None
+        
+                   
+class StateHelpIndex(object):
+    """
+    Handles the dynamic state help system. 
+    """
+    help_index = None
+    def __init__(self):
+        self.help_index = {}
+        self.identifier = '<<TOPIC:'
+
+    def add_state(self,state_name):
+        "Create a new state"
+        self.help_index[state_name] = {}
+
+    def add_state_help(self, state,command,text,staff_only=False):
+        """Store help for a command under a certain state.
+        Supports <<TOPIC:MyTopic>> and <<TOPIC:STAFF:MyTopic>> markup."""
+        if self.help_index.has_key(state):
+
+            if self.identifier in text:
+                topic_dict, staff_dict = edit_help.handle_help_markup(command, text, staff_only,
+                                                                      identifier=self.identifier)
+                for topic, text in topic_dict.items():
+                    entry = edit_help.format_footer(topic,text,topic_dict,staff_dict)
+                    if entry:                        
+                        self.help_index[state][topic] = (staff_only, entry)
+            else:
+                self.help_index[state][command] = (staff_only, text)
+
+    def get_state_help(self,caller, state, command):
+        "get help for a particular command within a state"
+        if self.help_index.has_key(state) and self.help_index[state].has_key(command):
+            help_tuple = self.help_index[state][command]
+            if caller.is_staff() or not help_tuple[0]:
+                return help_tuple[1]            
+            return None
+        else:
+            return None
+        
+    def get_state_index(self,caller, state):
+        "list all help topics for a state"
+        if self.help_index.has_key(state):                        
+            if caller.is_staff():
+                index = self.help_index[state].keys()
+            else:
+                index = []
+                for key, tup in self.help_index[state].items():
+                    if not tup[0]:
+                        index.append(key)
+            return sorted(index)
+        else:
+            return None
+
+#default commands available for all special states
+
+def cmd_state_exit(command):
+    """@exit (when in a state)
+
+    This command only works when inside a special game 'state' (like a menu or
+    editor or similar place where you have fewer commands available than normal).
+
+    It aborts what you were doing and force-exits back to the normal mode of
+    gameplay. Some states might deactivate the @exit command for various reasons.
+    In those cases, read the help when in the state to learn more."""
+
+    source_object = command.source_object
+    source_object.clear_state()
+    source_object.emit_to("... Exited.")
+    source_object.execute_cmd('look')        
+    
+def cmd_state_help(command):
+    """
+    help <topic> (while in a state)
+
+    In-state help system. This is NOT tied to the normal help
+    system and is not stored in the database. It is intended as a quick
+    reference for users when in the state; if you want a detailed description
+    of the state itself, you should probably add it to the main help system
+    so the user can read it at any time.
+    If you don't want to use the auto-system, turn off auto_help
+    for all commands in the state. You could then for example make a custom help command
+    that displays just a short help summary page instead.
+    """
+
+    source_object = command.source_object
+    state = source_object.get_state()
+    args = command.command_argument
+    help_index = GLOBAL_STATE_TABLE.help_index
+
+    if not args:
+        index = help_index.get_state_index(source_object, state)        
+        if not index:
+            source_object.emit_to("There is no help available here.")
+            return        
+        s = "Help topics for %s:\n" % state        
+        for i in index:
+            s += "  %s\n" % i
+        s = s[:-1]
+        source_object.emit_to(s)
+        return
+    else:
+        args = args.strip()
+        help = help_index.get_state_help(source_object, state, args)
+        if help:
+            source_object.emit_to("%s" % help)
+        else:
+            source_object.emit_to("No help available on %s." % args) 
+
+
+GLOBAL_STATE_TABLE = StateTable()