Module: RungerEmailReplyTrimmer
- Defined in:
- lib/runger_email_reply_trimmer.rb,
lib/runger_email_reply_trimmer/version.rb
Constant Summary collapse
- DELIMITER =
'd'
- EMBEDDED =
'b'
- EMPTY =
'e'
- EMAIL_HEADER =
'h'
- QUOTE =
'q'
- SIGNATURE =
's'
- TEXT =
't'
- VERSION =
'0.3.0'
Class Method Summary collapse
- .compute_elided(text, lines) ⇒ Object
- .extract_embedded_email(text) ⇒ Object
- .identify_line_content(line) ⇒ Object
- .is_reply_at_end?(pattern) ⇒ Boolean
- .preprocess!(text) ⇒ Object
- .trim(text, split = false) ⇒ Object
Class Method Details
.compute_elided(text, lines) ⇒ Object
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# File 'lib/runger_email_reply_trimmer.rb', line 205 def compute_elided(text, lines) elided = [] t = 0 l = 0 while t < text.size while l < lines.size && text[t] == lines[l] t += 1 l += 1 end elided << text[t] t += 1 end elided.join("\n").strip end |
.extract_embedded_email(text) ⇒ Object
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# File 'lib/runger_email_reply_trimmer.rb', line 137 def (text) return if text.nil? || text =~ /\A[[:space:]]*\z/m # do some cleanup preprocess!(text) # from now on, we'll work on a line-by-line basis lines = text.split("\n") # identify content of each lines pattern = lines.map { |l| identify_line_content(l) }.join if (index = pattern =~ /(?:h[eqd]*?){3,}[tq]/) = lines[index..].join("\n").strip elsif (index = pattern =~ /b(?:[eqd]*){3,}[tq]/) # Exception for email clients (macOS / iOS) which embed fwd emails in quotes. = lines[index + 1..].map { |l| l.gsub(/^>\s*/, '') }.join("\n").strip end if index before = lines[0...(pattern[0...index] =~ /e*(b[eqd]*|b*[ed]*)$/)].join("\n").strip [, before] end end |
.identify_line_content(line) ⇒ Object
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# File 'lib/runger_email_reply_trimmer.rb', line 22 def identify_line_content(line) return EMPTY if EmptyLineMatcher.match?(line) return DELIMITER if DelimiterMatcher.match?(line) return SIGNATURE if SignatureMatcher.match?(line) return EMBEDDED if EmbeddedEmailMatcher.match?(line) return EMAIL_HEADER if EmailHeaderMatcher.match?(line) return QUOTE if QuoteMatcher.match?(line) TEXT end |
.is_reply_at_end?(pattern) ⇒ Boolean
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# File 'lib/runger_email_reply_trimmer.rb', line 223 def is_reply_at_end?(pattern) pattern =~ /^b[^t]+t[et]*$/ end |
.preprocess!(text) ⇒ Object
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# File 'lib/runger_email_reply_trimmer.rb', line 162 def preprocess!(text) # normalize line endings text.gsub!("\r\n", "\n") # remove PGP markers text.gsub!(/\A-----BEGIN PGP SIGNED MESSAGE-----\n(?:Hash: \w+)?\s+/i, '') text.gsub!(/^-----BEGIN PGP SIGNATURE-----$[\s\S]+^-----END PGP SIGNATURE-----/, '') # remove unsubscribe links text.gsub!(/^Unsubscribe: .+@.+(\n.+http:.+)?\s*\z/i, '') # remove alias-style quotes marker text.gsub!(/^.*>{5} "[^"\n]+" == .+ writes:/, '') # change enclosed-style quotes format text.gsub!(/^>>> ?(.+) ?>>>$\n([\s\S]+?)\n^<<< ?\1 ?<<<$/) { ::Regexp.last_match(2).gsub(/^/, '> ') } text.gsub!(/^>{4,}[[:blank:]]*$\n([\s\S]+?)\n^<{4,}[[:blank:]]*$/) { ::Regexp.last_match(1).gsub(/^/, '> ') } # fix all quotes formats text.gsub!(/^((?:[[:blank:]]*[[:alpha:]]*[>|])+)/) { ::Regexp.last_match(1).gsub(/([[:alpha:]]+>|\|)/, '>') } # fix embedded email markers that might span over multiple lines ( EmbeddedEmailMatcher::ON_DATE_SOMEONE_WROTE_REGEXES + EmbeddedEmailMatcher::SOMEONE_WROTE_ON_DATE_REGEXES + EmbeddedEmailMatcher::DATE_SOMEONE_WROTE_REGEXES + [EmbeddedEmailMatcher::DATE_SOMEONE_EMAIL_REGEX] ).each do |r| text.gsub!(r) do |m| m.count("\n") > 4 ? m : m.gsub(/\n+[[:space:]]*/, ' ') end end # remove leading/trailing whitespaces text.strip! end |
.trim(text, split = false) ⇒ Object
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# File 'lib/runger_email_reply_trimmer.rb', line 33 def trim(text, split = false) return if text.nil? || text =~ /\A[[:space:]]*\z/m # do some cleanup preprocess!(text) # from now on, we'll work on a line-by-line basis lines = text.split("\n") lines_dup = lines.dup # identify content of each lines pattern = lines.map { |l| identify_line_content(l) }.join # remove everything after the first delimiter if pattern =~ /d/ index = pattern =~ /d/ pattern = pattern[0...index] lines = lines[0...index] end # remove all mobile signatures while pattern =~ /s/ index = pattern =~ /s/ pattern.slice!(index) lines.slice!(index) end # when the reply is at the end of the email if is_reply_at_end?(pattern) index = pattern =~ /t[et]*$/ pattern = '' lines = lines[index..] end # if there is an embedded email marker, not followed by a quote # then take everything up to that marker if pattern =~ /te*b[^q]*$/ index = pattern =~ /te*b[^q]*$/ pattern = pattern[0..index] lines = lines[0..index] end # if there is an embedded email marker, followed by a huge quote # then take everything up to that marker if pattern =~ /te*b[eqbh]*([te]*)$/ && ::Regexp.last_match(1).count('t') < 7 index = pattern =~ /te*b[eqbh]*[te]*$/ pattern = pattern[0..index] lines = lines[0..index] end # if there is some text before a huge quote ending the email, # then remove the quote if pattern =~ /t?e*[qbe]+$/ index = pattern =~ /t?e*[qbe]+$/ pattern = pattern[0..index] lines = lines[0..index] end # if there still are some embedded email markers, just remove them while pattern =~ /b/ index = pattern =~ /b/ pattern.slice!(index) lines.slice!(index) end # fix email headers when they span over multiple lines if pattern =~ /h+[hte]+h+e/ index = pattern =~ /h+[hte]+h+e/ size = pattern[/h+[hte]+h+e/].size size.times.each { |s| pattern[index + s] = EMAIL_HEADER } end # if there are at least 3 consecutive email headers, # take everything up to these headers if pattern =~ /t[eq]*h{3,}/ index = pattern =~ /t[eq]*h{3,}/ pattern = pattern[0..index] lines = lines[0..index] end # if there still are some email headers, just remove them while pattern =~ /h/ index = pattern =~ /h/ pattern.slice!(index) lines.slice!(index) end # remove trailing quotes when there's at least one line of text if pattern =~ /t/ && pattern =~ /[eq]+$/ index = pattern =~ /[eq]+$/ pattern = pattern[0...index] lines = lines[0...index] end # results trimmed = lines.join("\n").strip if split [trimmed, compute_elided(lines_dup, lines)] else trimmed end end |