Alek Ratzloff
e868d0e14f
In case we want to run this on something that isn't an ANSI terminal, we have the option to implement it however we want. Signed-off-by: Alek Ratzloff <alekratz@gmail.com>
89 lines
2.4 KiB
Python
89 lines
2.4 KiB
Python
import sys
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import termios
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from typing import Optional, TextIO
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from agame.color import colorize
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from .display import Display
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ESC = "\u001b"
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ANSI_MOVE_BOTTOM = f"{ESC}[999;0f"
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class ANSIDisplay(Display):
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"""
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Display for a modern terminal.
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This display attempts to keep the input at the bottom, and the output
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scrolling up.
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This utilizes `termios` and is therefore UNIX-only.
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"""
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def __init__(
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self,
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input_prompt: str = colorize("{{>}} "),
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stdin: TextIO = sys.stdin,
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stdout: TextIO = sys.stdout,
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):
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self.input_prompt = input_prompt
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self.__stdin = stdin
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self.__stdout = stdout
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# Initial set-up:
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# . Move the cursor to the bottom left part of the screen (this will set
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# the current line to a really high value and will move us to the
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# bottom of the screen)
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self.stdout.write(ANSI_MOVE_BOTTOM)
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# . Disable echo, set cbreak
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fd = self.stdin.fileno()
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self.__old_attrs = termios.tcgetattr(fd)
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self.cbreak()
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# . Clear
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self.clear()
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def line(self, line: str = ""):
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self.stdout.write(line)
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self.stdout.write("\n")
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def input(self) -> str:
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try:
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self.nocbreak()
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return input(self.input_prompt)
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finally:
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self.cbreak()
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def wait_for_ack(self, prompt: Optional[str] = "Press any key to continue..."):
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# Flush unread data
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termios.tcflush(self.stdin.fileno(), termios.TCIFLUSH)
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if prompt is not None:
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self.line(prompt)
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self.stdin.read(1)
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def cbreak(self):
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fd = self.stdin.fileno()
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new = termios.tcgetattr(fd)
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new[3] &= ~(termios.ECHO | termios.ICANON)
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termios.tcsetattr(fd, termios.TCSADRAIN, new)
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def nocbreak(self):
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fd = self.stdin.fileno()
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new = termios.tcgetattr(fd)
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new[3] |= termios.ECHO | termios.ICANON
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termios.tcsetattr(fd, termios.TCSADRAIN, new)
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def finish(self):
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# Clean up by restoring the old terminal state
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fd = self.stdin.fileno()
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termios.tcsetattr(fd, termios.TCSADRAIN, self.__old_attrs)
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def clear(self):
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self.stdout.write(f"{ESC}[2J")
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@property
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def stdin(self) -> TextIO:
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return self.__stdin
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@property
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def stdout(self) -> TextIO:
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return self.__stdout
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