Adding upstream version 1.0.2.

Signed-off-by: Daniel Baumann <daniel@debian.org>

classify.go

@@ -0,0 +1,93 @@
+package reply
+
+import (
+	re2 "github.com/dlclark/regexp2"
+)
+
+const (
+	delimiter = "d"
+	embedded  = "b"
+	empty     = "e"
+	header    = "h"
+	quote     = "q"
+	signature = "s"
+	text      = "t"
+)
+
+func classifyLine(line string) string {
+	if isEmptyLine(line) {
+		return empty
+	}
+
+	if isDelimiter(line) {
+		return delimiter
+	}
+
+	if isSignature(line) {
+		return signature
+	}
+
+	if isEmbeddedEmail(line) {
+		return embedded
+	}
+
+	if isHeader(line) {
+		return header
+	}
+
+	if isQuote(line) {
+		return quote
+	}
+
+	return text
+}
+
+func isEmptyLine(line string) bool {
+	ok, _ := re2.MustCompile(`^[[:blank:]]*$`, re2.RE2).MatchString(line)
+	return ok
+}
+
+func isQuote(line string) bool {
+	ok, _ := re2.MustCompile(`^[[:blank:]]*>`, re2.RE2).MatchString(line)
+	return ok
+}
+
+func isDelimiter(line string) bool {
+	ok, _ := re2.MustCompile(`^[[:blank:]]*([_,=+~#*ᐧ—]+|[\-]{4,}|[\-]+[[:blank:]])[[:blank:]]*$`, re2.RE2).MatchString(line)
+	return ok
+}
+
+func isSignature(line string) bool {
+	// remove any markdown links
+	stripped, _ := re2.MustCompile(`\[([^\]]+)\]\([^\)]+\)`, re2.RE2).Replace(line, "$1", 0, -1)
+	for _, r := range patterns["SIGNATURE_REGEXES"] {
+		ok, _ := r.MatchString(stripped)
+		if ok {
+			return true
+		}
+	}
+
+	return false
+}
+
+func isHeader(line string) bool {
+	for _, r := range patterns["EMAIL_HEADER_REGEXES"] {
+		ok, _ := r.MatchString(line)
+		if ok {
+			return true
+		}
+	}
+
+	return false
+}
+
+func isEmbeddedEmail(line string) bool {
+	for _, r := range patterns["EMBEDDED_REGEXES"] {
+		ok, _ := r.MatchString(line)
+		if ok {
+			return true
+		}
+	}
+
+	return false
+}