diff options
| -rwxr-xr-x | filters/plaintext | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/filters/plaintext b/filters/plaintext new file mode 100755 index 00000000..f4801ebf --- /dev/null +++ b/filters/plaintext @@ -0,0 +1,171 @@ +#!/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()) |