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