filters: port colorize to awk

Python is not available on all systems. Port the colorize filter to awk
as it is a more widespread POSIX utility.

Users are free to copy the filter into their home dir and tweak the
colors to their needs. The highlighted items are:

  =============== ======= ======= ========= =================
  Item            Red     Green   Blue      Color
  =============== ======= ======= ========= =================
  quoted text 1   95      175     255       Blue
  quoted text 2   255     135     0         Orange
  quoted text 3   175     135     255       Purple
  quoted text 4   255     95      215       Pink
  quoted text *   128     128     128       Grey
  diff meta       255     255     255       White bold
  diff chunk      205     0       205       Cyan
  diff added      0       205     0         Red
  diff removed    205     0       0         Green
  signature       175     135     255       Purple
  header          175     135     255       Purple
  url             255     255     175       Yellow
  =============== ======= ======= ========= =================

This assumes a terminal emulator with true color support and with
a dark/black background.

Link: https://github.com/termstandard/colors
Signed-off-by: Robin Jarry <robin@jarry.cc>
This commit is contained in:
Robin Jarry 2022-02-21 15:54:08 +01:00
parent 9dc2803220
commit df8c129235

View file

@ -1,171 +1,142 @@
#!/usr/bin/env python3 #!/bin/awk -f
# Copyright (c) 2022 Robin Jarry # Copyright (c) 2022 Robin Jarry
""" BEGIN {
Colorize plaintext email. Write to stdout. # R;G;B colors
""" url = "\x1b[38;2;255;255;175m" # yellow
header = "\x1b[38;2;175;135;255m" # purple
import re signature = "\x1b[38;2;175;135;255m" # purple
import sys diff_meta = "\x1b[1;38;2;255;255;255m" # bold white
diff_chunk = "\x1b[38;205;0;205m" # cyan
diff_add = "\x1b[38;2;0;205;0m" # green
TERM_RESET = "\x1b[0m" diff_del = "\x1b[38;2;205;0;0m" # red
TERM_BOLD = "\x1b[1m" quote_1 = "\x1b[38;2;95;175;255m" # blue
TERM_BG_GRAY = "\x1b[48;5;244m" quote_2 = "\x1b[38;2;255;135;0m" # orange
TERM_FG_GRAY = "\x1b[38;5;244m" quote_3 = "\x1b[38;2;175;135;255m" # purple
TERM_FG_RED = "\x1b[38;5;1m" quote_4 = "\x1b[38;2;255;95;215m" # pink
TERM_FG_GREEN = "\x1b[38;5;2m" quote_x = "\x1b[38;2;128;128;128m" # gray
TERM_FG_CYAN = "\x1b[38;5;6m" reset = "\x1b[0m"
TERM_FG_YELLOW = "\x1b[38;5;229m" # state
TERM_FG_WHITE = "\x1b[38;5;15m" in_diff = 0
TERM_FG_BLUE = "\x1b[38;5;75m" in_signature = 0
TERM_FG_PURPLE = "\x1b[38;5;141m" in_headers = 0
TERM_FG_ORANGE = "\x1b[38;5;208m" in_body = 0
TERM_FG_PINK = "\x1b[38;5;171m" # patterns
QUOTE_COLORS = { header_pattern = @/^[A-Z][[:alnum:]-]+:/
1: TERM_FG_BLUE, url_pattern = @/[a-z]{2,6}:\/\/[[:graph:]]+|[[:alnum:]_\+\.~\/-]*[[:alnum:]_]@[[:lower:]][[:alnum:]\.-]*[[:lower:]]/
2: TERM_FG_ORANGE,
3: TERM_FG_PURPLE,
4: TERM_FG_PINK,
} }
URL_RE = re.compile( function color_quote(line) {
r""" level = 0
( quotes = ""
https?://[\w,;:!/#%^=@~\&\*\+\?\.\-]+ while (line ~ /^>/) {
| level += 1
[\w\-\+\.~/]*\w@\w[\w\-\.]+\w quotes = quotes ">"
) line = substr(line, 2)
""", while (line ~ /^ /) {
re.VERBOSE, quotes = quotes " "
) line = substr(line, 2)
HEADER_RE = re.compile(r"^[A-Z][\w-]+:") }
DIFF_META = ("diff --git ", "index ", "--- ", "+++ ") }
if (level == 1) {
color = quote_1
} else if (level == 2) {
color = quote_2
} else if (level == 3) {
color = quote_3
} else if (level == 4) {
color = quote_4
} else {
color = quote_x
}
if (line ~ /^\+/) {
return color quotes diff_add line reset
} else if (line ~ /^-/) {
return color quotes diff_del line reset
}
gsub(url_pattern, url "&" color, line)
return color quotes line reset
}
{
# Strip carriage returns from line
sub(/\r$/, "")
if (in_diff) {
if ($0 ~ /^-- ?$/) {
in_signature = 1
in_diff = 0
in_headers = 0
in_body = 0
$0 = signature $0 reset
} else if ($0 ~ /^@@ /) {
$0 = diff_chunk $0 reset
} else if ($0 ~ /^(diff --git|index|---|\+\+\+) /) {
$0 = diff_meta $0 reset
} else if ($0 ~ /^\+/) {
$0 = diff_add $0 reset
} else if ($0 ~ /^-/) {
$0 = diff_del $0 reset
}
} else if (in_signature) {
$0 = signature $0 reset
gsub(url_pattern, url "&" signature)
} else if (in_headers) {
if ($0 ~ /^$/) {
in_signature = 0
in_diff = 0
in_headers = 0
in_body = 1
} else {
sub(header_pattern, header "&" reset)
gsub(url_pattern, url "&" reset)
}
} else if (in_body) {
if ($0 ~ /^>/) {
$0 = color_quote($0)
} else if ($0 ~ /^diff --git /) {
in_signature = 0
in_diff = 1
in_headers = 0
in_body = 0
$0 = diff_meta $0 reset
} else if ($0 ~ /^-- ?$/) {
in_signature = 1
in_diff = 0
in_headers = 0
in_body = 0
$0 = signature $0 reset
} else {
gsub(url_pattern, url "&" reset)
}
} else if ($0 ~ /^diff --git /) {
in_signature = 0
in_diff = 1
in_headers = 0
in_body = 0
$0 = diff_meta $0 reset
} else if ($0 ~ /^-- ?$/) {
in_signature = 1
in_diff = 0
in_headers = 0
in_body = 0
$0 = signature $0 reset
} else if ($0 ~ header_pattern) {
in_signature = 0
in_diff = 0
in_headers = 1
in_body = 0
sub(header_pattern, header "&" reset)
gsub(url_pattern, url "&" reset)
} else {
in_signature = 0
in_diff = 0
in_headers = 0
in_body = 1
if ($0 ~ /^>/) {
$0 = color_quote($0)
} else {
gsub(url_pattern, url "&" reset)
}
}
def replace_match(color, context_color): print
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())