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"""
Output engine for rainbow parenthesis.
Attaches terminal escape codes for use on UNIX-like systems.
"""
from enum import auto, Enum
# from dataclasses import dataclass, field
from . import Colored
CSI = '\033['
class ANSIColor(Enum):
"""Known CSI colors."""
# BLACK = 30
RED = 31
GREEN = auto()
YELLOW = auto()
BLUE = auto()
MAGENTA = auto()
CYAN = auto()
@classmethod
def get(cls, depth: int) -> int:
"""Get color code for the given depth."""
return list(cls)[depth % len(list(cls))].value
def SGR(*xs):
"""
Build a CSI escape sequence.
https://en.wikipedia.org/wiki/ANSI_escape_code#CSI_(Control_Sequence_Introducer)_sequences
"""
return CSI + ';'.join(str(x) for x in xs) + 'm'
def colorize(c: Colored) -> str:
"""Return contents of colored, surrounded by color escapes."""
out = SGR(1, ANSIColor.get(c.depth))
out += c.item
out += SGR()
return out
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