python-roguelike/message_log.py

from typing import Iterable, List, Reversible, Tuple
import textwrap

import tcod

import color


class Message:
    def __init__(self, text: str, fg: Tuple[int, int, int]):
        self.plain_text = text
        self.fg = fg
        self.count = 1

    @property
    def full_text(self) -> str:
        """The full text of this message, including the count if necessary."""
        if self.count > 1:
            return f"{self.plain_text} (x{self.count})"

        return self.plain_text


class MessageLog:
    def __init__(self) -> None:
        self.messages: List[Message] = []

    def add_message(
        self, text: str, fg: Tuple[int, int, int] = color.white, *, stack: bool = True
    ) -> None:
        """Add a message to this log.
        `text` is the message text, `fg` is the text color.
        If `stack is True then the message can stack with a previous message
        of the same text.
        """
        if stack and self.messages and text == self.messages[-1].plain_text:
            self.messages[-1].count += 1
        else:
            self.messages.append(Message(text, fg))

    def render(
        self,
        console: tcod.Console,
        x: int,
        y: int,
        width: int,
        height: int,
    ) -> None:
        """Render this log over the given area.
        `x`, `y`, `width`, `height` is the rectangular region to render onto
        the `console`.
        """
        self.render_messages(console, x, y, width, height, self.messages)

    @staticmethod
    def wrap(string: str, width: int) -> Iterable[str]:
        """Return a wrapped text message."""
        for line in string.splitlines():  # Handle newlines in messages.
            yield from textwrap.wrap(line, width, expand_tabs=True)

    @classmethod
    def render_messages(
        cls,
        console: tcod.Console,
        x: int,
        y: int,
        width: int,
        height: int,
        messages: Reversible[Message],
    ) -> None:
        """Render the messages provided.
        The `messages` are rendered starting at the last message and working
        backwards.
        """
        y_offset = height - 1

        for message in reversed(messages):
            for line in reversed(list(cls.wrap(message.full_text, width))):
                console.print(x=x, y=y + y_offset, string=line, fg=message.fg)
                y_offset -= 1
                if y_offset < 0:
                    return  # No more space to print messages