filters: add a more complete plaintext filter
Colorize most plain text messages. Signed-off-by: Robin Jarry <robin@jarry.cc>
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Robin Jarry
parent
7c3ce816c8
commit
bca93cd915
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@ -0,0 +1,171 @@
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#!/usr/bin/env python3
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# Copyright (c) 2022 Robin Jarry
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"""
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Colorize plaintext email. Write to stdout.
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"""
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import re
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import sys
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TERM_RESET = "\x1b[0m"
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TERM_BOLD = "\x1b[1m"
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TERM_BG_GRAY = "\x1b[48;5;244m"
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TERM_FG_GRAY = "\x1b[38;5;244m"
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TERM_FG_RED = "\x1b[38;5;1m"
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TERM_FG_GREEN = "\x1b[38;5;2m"
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TERM_FG_CYAN = "\x1b[38;5;6m"
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TERM_FG_YELLOW = "\x1b[38;5;229m"
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TERM_FG_WHITE = "\x1b[38;5;15m"
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TERM_FG_BLUE = "\x1b[38;5;75m"
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TERM_FG_PURPLE = "\x1b[38;5;141m"
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TERM_FG_ORANGE = "\x1b[38;5;208m"
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TERM_FG_PINK = "\x1b[38;5;171m"
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QUOTE_COLORS = {
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1: TERM_FG_BLUE,
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2: TERM_FG_ORANGE,
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3: TERM_FG_PURPLE,
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4: TERM_FG_PINK,
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}
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URL_RE = re.compile(
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r"""
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(
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https?://[\w,;:!/#%^=@~\&\*\+\?\.\-]+
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[\w\-\+\.~/]*\w@\w[\w\-\.]+\w
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)
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""",
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re.VERBOSE,
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)
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HEADER_RE = re.compile(r"^[A-Z][\w-]+:")
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DIFF_META = ("diff --git ", "index ", "--- ", "+++ ")
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def replace_match(color, context_color):
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def replace_func(match):
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return color + match.group(0) + context_color
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return replace_func
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def main():
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in_patch = in_signature = in_headers = in_body = False
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for line in sys.stdin.buffer:
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line = line.decode("utf-8", errors="replace").rstrip("\r\n")
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if in_patch:
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if line in ("--", "-- "):
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in_signature = True
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in_body = in_patch = in_headers = False
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line = TERM_FG_PURPLE + line + TERM_RESET
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elif line.startswith("@@ "):
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line = TERM_FG_CYAN + line + TERM_RESET
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elif any(line.startswith(m) for m in DIFF_META):
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line = TERM_BOLD + TERM_FG_WHITE + line + TERM_RESET
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elif line.startswith("+"):
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line = TERM_FG_GREEN + line + TERM_RESET
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elif line.startswith("-"):
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line = TERM_FG_RED + line + TERM_RESET
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elif in_signature:
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line = (
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TERM_FG_PURPLE
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+ URL_RE.sub(replace_match(TERM_FG_YELLOW, TERM_FG_PURPLE), line)
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+ TERM_RESET
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)
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elif in_headers:
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if line == "":
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in_body = True
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in_headers = False
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else:
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line = HEADER_RE.sub(replace_match(TERM_FG_PURPLE, TERM_RESET), line)
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line = URL_RE.sub(replace_match(TERM_FG_YELLOW, TERM_RESET), line)
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elif in_body:
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if line.startswith(">"):
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level = 0
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quotes = ""
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while line.startswith(">"):
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quotes += ">"
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line = line[1:]
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level += 1
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while line.startswith(" "):
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quotes += " "
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line = line[1:]
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quote_color = QUOTE_COLORS.get(quotes.count(">"), TERM_FG_GRAY)
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if line.startswith("+"):
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line = quote_color + quotes + TERM_FG_GREEN + line + TERM_RESET
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elif line.startswith("-"):
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line = quote_color + quotes + TERM_FG_RED + line + TERM_RESET
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else:
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line = (
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quote_color
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+ quotes
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+ URL_RE.sub(
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replace_match(TERM_FG_YELLOW, quote_color), line
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)
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+ TERM_RESET
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)
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elif line.startswith("diff --git "):
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in_patch = True
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in_body = in_headers = False
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line = TERM_BOLD + TERM_FG_WHITE + line + TERM_RESET
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elif line in ("--", "-- "):
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in_signature = True
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in_body = in_patch = in_headers = False
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line = TERM_FG_PURPLE + line + TERM_RESET
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else:
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line = URL_RE.sub(replace_match(TERM_FG_YELLOW, TERM_RESET), line)
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elif line.startswith("diff --git "):
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in_patch = True
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in_body = in_headers = False
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line = TERM_BOLD + TERM_FG_WHITE + line + TERM_RESET
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elif line in ("--", "-- "):
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in_signature = True
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in_body = in_patch = in_headers = False
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line = TERM_FG_PURPLE + line + TERM_RESET
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elif HEADER_RE.search(line):
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in_headers = True
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line = HEADER_RE.sub(replace_match(TERM_FG_PURPLE, TERM_RESET), line)
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line = URL_RE.sub(replace_match(TERM_FG_YELLOW, TERM_RESET), line)
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else:
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in_body = True
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if line.startswith(">"):
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level = 0
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quotes = ""
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while line.startswith(">"):
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quotes += ">"
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line = line[1:]
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level += 1
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while line.startswith(" "):
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quotes += " "
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line = line[1:]
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quote_color = QUOTE_COLORS.get(quotes.count(">"), TERM_FG_GRAY)
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if line.startswith("+"):
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line = quote_color + quotes + TERM_FG_GREEN + line + TERM_RESET
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elif line.startswith("-"):
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line = quote_color + quotes + TERM_FG_RED + line + TERM_RESET
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else:
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line = (
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quote_color
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+ quotes
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+ URL_RE.sub(
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replace_match(TERM_FG_YELLOW, quote_color), line
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)
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+ TERM_RESET
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)
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sys.stdout.write(line + "\r\n")
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sys.stdout.flush()
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if __name__ == "__main__":
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sys.exit(main())
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