Add dialog actions

Rudimentary user input for dialogs has been added.

* Displays must add support for showing dialog options, and receiving
  user input for dialog selections.
* A selected dialog can optionally perform actions, and then directs the
  game into the next dialog state.
* Dialog options may be conditionally shown with variables.

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

agame/action.py

@@ -1,10 +1,11 @@
 import dataclasses
 import time
-from typing import Any, Optional, Sequence, Union, TYPE_CHECKING
+from typing import Any, Mapping, Optional, Sequence, Union, TYPE_CHECKING
 import enum
 
 if TYPE_CHECKING:
     from agame.game import Game
+    from agame.dialog import DialogOption
 
 
 __all__ = (
@@ -24,6 +25,7 @@ __all__ = (
     "SetVarAction",
     "RevealItemAction",
     "UnrevealItemAction",
+    "DialogAction",
 )
 
 
@@ -441,3 +443,32 @@ class UnrevealItemAction(Action):
             self.item_id in game.room.items
         ), f"item id {self.item_id} does not exist in the current room {game.room.id}"
         game.room.items[self.item_id].revealed = False
+
+
+@dataclasses.dataclass
+class DialogAction(Action):
+    """
+    Displays a new dialog.
+    """
+
+    dialog: Mapping[str, Sequence["DialogOption"]]
+    start: str
+
+    def act(self, game: "Game"):
+        selection_id: Optional[str] = self.start
+
+        while selection_id:
+            # Figure out which options should appear
+            options = [
+                opt
+                for opt in self.dialog[selection_id]
+                # this is a logical implication
+                # required_var -> (game.vars[opt.required_var])
+                if not opt.required_var
+                or (opt.required_var and game.vars[opt.required_var])
+            ]
+            # Get the selection
+            selection = game.display.dialog_options(options)
+            selection_id = selection.next
+            # Do dialog actions
+            game.do_actions(selection.actions)

agame/dialog.py

@@ -0,0 +1,40 @@
+import dataclasses
+from typing import Mapping, Optional, Sequence, TYPE_CHECKING
+
+if TYPE_CHECKING:
+    from agame.action import Action
+
+
+@dataclasses.dataclass
+class DialogOption:
+    # The text for this dialog option.
+    text: str
+    # The actions that get executed upon choosing this dialog option.
+    actions: Sequence["Action"] = dataclasses.field(default_factory=list)
+    # The variable required for being able to display this dialog option.
+    #
+    # This variable must not be equal to `False`.
+    required_var: Optional[str] = None
+    # The next dialog that is chosen.
+    next: Optional[str] = None
+
+
+{
+    "main": {
+        "type": "reply",
+        "options": [
+            {
+                "text": "What happened here?",
+                "next": "main",
+                "actions": [],
+            },
+            {
+                "text": "Bye.",
+            },
+        ],
+    },
+    "bye": {
+        "type": "print",
+        "text": "Mhm.",
+    },
+}

agame/display/__init__.py

@@ -1,4 +1,7 @@
 import platform
+from typing import Optional, Sequence, Tuple
+from agame.action import Action
+from agame.dialog import DialogOption
 from .display import Display
 
 if platform.system() in ("Linux", "Darwin", "Unix"):
@@ -14,5 +17,31 @@ class BasicDisplay(Display):
     def line(self, line: str = ""):
         print(line)
 
-    def input(self) -> str:
-        return input("> ")
+    def input(self, prompt: Optional[str] = None) -> str:
+        if prompt is None:
+            prompt = "> "
+        return input(prompt)
+
+    def wait_for_ack(self, prompt: Optional[str] = "Press enter to continue..."):
+        input(prompt or "")
+
+    def dialog_options(self, options: Sequence[DialogOption]) -> DialogOption:
+        valid_opts = range(1, len(options) + 1)
+
+        def print_opts():
+            for i, opt in enumerate(options):
+                self.line(f"{i}. {opt.text}")
+
+        print_opts()
+        while True:
+            got = self.input("? ")
+            try:
+                choice = int(got)
+            except ValueError:
+                print_opts()
+                continue
+            if choice in valid_opts:
+                break
+        index = choice - 1
+        selection = options[index]
+        return selection

agame/display/display.py

@@ -1,5 +1,10 @@
 import abc
-from typing import Optional
+from typing import Optional, Sequence, Tuple, TYPE_CHECKING
+from agame.action import Action
+from agame.dialog import DialogOption
+
+if TYPE_CHECKING:
+    from agame.game import Game
 
 
 class Display(metaclass=abc.ABCMeta):
@@ -14,7 +19,7 @@ class Display(metaclass=abc.ABCMeta):
         "Print a single line to the display."
 
     @abc.abstractmethod
-    def input(self) -> str:
+    def input(self, prompt: Optional[str] = None) -> str:
         "Get player input."
 
     @abc.abstractmethod
@@ -28,5 +33,31 @@ class Display(metaclass=abc.ABCMeta):
         user.
         """
 
+    def dialog_options(self, options: Sequence[DialogOption]) -> DialogOption:
+        """
+        Displays, and gets, an answer from a list of dialog options.
+
+        Returns the selected DialogOption.next value and actions.
+        """
+        valid_opts = range(1, len(options) + 1)
+
+        def print_opts():
+            for i, opt in enumerate(options):
+                self.line(f"{i}. {opt.text}")
+
+        print_opts()
+        while True:
+            got = self.input("? ")
+            try:
+                choice = int(got)
+            except ValueError:
+                print_opts()
+                continue
+            if choice in valid_opts:
+                break
+        index = choice - 1
+        selection = options[index]
+        return selection
+
     def finish(self):
         "Final cleanup code for this display."

agame/display/unix.py

@@ -1,9 +1,14 @@
 import sys
 import termios
-from typing import Optional, TextIO
+from typing import Optional, Sequence, TextIO, Tuple, TYPE_CHECKING
 from agame.color import colorize
+from agame.action import Action
+from agame.dialog import DialogOption
 from .display import Display
 
+if TYPE_CHECKING:
+    from agame.game import Game
+
 ESC = "\u001b"
 ANSI_MOVE_BOTTOM = f"{ESC}[999;0f"
 
@@ -45,10 +50,12 @@ class ANSIDisplay(Display):
         self.stdout.write(line)
         self.stdout.write("\n")
 
-    def input(self) -> str:
+    def input(self, prompt: Optional[str] = None) -> str:
+        if prompt is None:
+            prompt = self.input_prompt
         try:
             self.nocbreak()
-            return input(self.input_prompt)
+            return input(prompt)
         finally:
             self.cbreak()
 
@@ -59,6 +66,33 @@ class ANSIDisplay(Display):
             self.line(prompt)
         self.stdin.read(1)
 
+    def dialog_options(self, options: Sequence[DialogOption]) -> DialogOption:
+        valid_opts = range(1, len(options) + 1)
+
+        def print_opts():
+            for i, opt in zip(valid_opts, options):
+                # TODO - format/colorize this so it stands out
+                self.line(f"{i}. {opt.text}")
+
+        print_opts()
+        while True:
+            got = self.input("? ")
+            try:
+                choice = int(got)
+            except ValueError:
+                print_opts()
+                continue
+            if choice in valid_opts:
+                break
+        index = choice - 1
+        selection = options[index]
+        return selection
+
+    def finish(self):
+        # Clean up by restoring the old terminal state
+        fd = self.stdin.fileno()
+        termios.tcsetattr(fd, termios.TCSADRAIN, self.__old_attrs)
+
     def cbreak(self):
         fd = self.stdin.fileno()
         new = termios.tcgetattr(fd)
@@ -71,11 +105,6 @@ class ANSIDisplay(Display):
         new[3] |= termios.ECHO | termios.ICANON
         termios.tcsetattr(fd, termios.TCSADRAIN, new)
 
-    def finish(self):
-        # Clean up by restoring the old terminal state
-        fd = self.stdin.fileno()
-        termios.tcsetattr(fd, termios.TCSADRAIN, self.__old_attrs)
-
     def clear(self):
         self.stdout.write(f"{ESC}[2J")