41c14b206c
Diff chunks can occur in the middle of email conversations followed by regular and/or quoted text. Handle that properly. Change diff meta lines inside quotes to bold. Update the meta lines with more combination for renamed, copied and deleted files. Fix the diff_chunk invalid color code, only colorize the chunk characters, not the whole line. Remove redundant variable resets to 0. Signed-off-by: Robin Jarry <robin@jarry.cc> Acked-on-irc-by: Tim Culverhouse <tim@timculverhouse.com>
135 lines
3.2 KiB
Awk
Executable file
135 lines
3.2 KiB
Awk
Executable file
#!/usr/bin/awk -f
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# Copyright (c) 2022 Robin Jarry
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BEGIN {
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# R;G;B colors
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url = "\033[38;2;255;255;175m" # yellow
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header = "\033[38;2;175;135;255m" # purple
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signature = "\033[38;2;175;135;255m" # purple
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diff_meta = "\033[1;38;2;255;255;255m" # bold white
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diff_chunk = "\033[38;2;0;205;205m" # cyan
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diff_add = "\033[38;2;0;205;0m" # green
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diff_del = "\033[38;2;205;0;0m" # red
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quote_1 = "\033[38;2;95;175;255m" # blue
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quote_2 = "\033[38;2;255;135;0m" # orange
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quote_3 = "\033[38;2;175;135;255m" # purple
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quote_4 = "\033[38;2;255;95;215m" # pink
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quote_x = "\033[38;2;128;128;128m" # gray
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bold = "\033[1m"
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reset = "\033[0m"
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# state
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in_diff = 0
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in_signature = 0
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in_headers = 0
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in_body = 0
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# patterns
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header_pattern = @/^[A-Z][[:alnum:]-]+:/
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url_pattern = @/[a-z]{2,6}:\/\/[[:graph:]]+|(mailto:)?[[:alnum:]_\+\.~\/-]*[[:alnum:]_]@[[:lower:]][[:alnum:]\.-]*[[:lower:]]/
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meta_pattern = @/^(diff --git|(new|deleted) file|similarity index|(rename|copy) (to|from)|index|---|\+\+\+) /
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}
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function color_quote(line) {
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level = 0
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quotes = ""
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while (line ~ /^>/) {
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level += 1
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quotes = quotes ">"
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line = substr(line, 2)
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while (line ~ /^ /) {
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quotes = quotes " "
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line = substr(line, 2)
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}
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}
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if (level == 1) {
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color = quote_1
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} else if (level == 2) {
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color = quote_2
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} else if (level == 3) {
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color = quote_3
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} else if (level == 4) {
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color = quote_4
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} else {
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color = quote_x
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}
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if (line ~ meta_pattern) {
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return color quotes bold line reset
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} else if (line ~ /^\+/) {
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return color quotes diff_add line reset
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} else if (line ~ /^-/) {
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return color quotes diff_del line reset
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}
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gsub(url_pattern, url "&" color, line)
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return color quotes line reset
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}
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{
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# Strip carriage returns from line
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sub(/\r$/, "")
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if (in_diff) {
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if ($0 ~ /^-- ?$/) {
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in_diff = 0
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in_signature = 1
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$0 = signature $0 reset
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} else if ($0 ~ /^@@ /) {
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gsub(/^@@[^@]+@@/, diff_chunk "&" reset)
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} else if ($0 ~ meta_pattern) {
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$0 = diff_meta $0 reset
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} else if ($0 ~ /^\+/) {
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$0 = diff_add $0 reset
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} else if ($0 ~ /^-/) {
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$0 = diff_del $0 reset
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} else if ($0 !~ /^ / && $0 !~ /^$/) {
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in_diff = 0
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in_body = 1
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if ($0 ~ /^>/) {
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$0 = color_quote($0)
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} else {
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gsub(url_pattern, url "&" reset)
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}
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}
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} else if (in_signature) {
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gsub(url_pattern, url "&" signature)
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$0 = signature $0 reset
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} else if (in_headers) {
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if ($0 ~ /^$/) {
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in_headers = 0
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in_body = 1
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} else {
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sub(header_pattern, header "&" reset)
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gsub(url_pattern, url "&" reset)
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}
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} else if (in_body) {
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if ($0 ~ /^>/) {
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$0 = color_quote($0)
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} else if ($0 ~ /^diff --git /) {
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in_body = 0
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in_diff = 1
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$0 = diff_meta $0 reset
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} else if ($0 ~ /^-- ?$/) {
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in_body = 0
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in_signature = 1
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$0 = signature $0 reset
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} else {
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gsub(url_pattern, url "&" reset)
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}
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} else if ($0 ~ /^diff --git /) {
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in_diff = 1
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$0 = diff_meta $0 reset
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} else if ($0 ~ /^-- ?$/) {
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in_signature = 1
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$0 = signature $0 reset
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} else if ($0 ~ header_pattern) {
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in_headers = 1
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sub(header_pattern, header "&" reset)
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gsub(url_pattern, url "&" reset)
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} else {
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in_body = 1
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if ($0 ~ /^>/) {
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$0 = color_quote($0)
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} else {
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gsub(url_pattern, url "&" reset)
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}
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}
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print
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}
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