5 files changed, 123 insertions, 0 deletions
diff --git a/scripts/mailing-list-member-retirement/.gitignore b/scripts/mailing-list-member-retirement/.gitignore
new file mode 100644
index 0000000..7adb4be
--- /dev/null
+++ b/scripts/mailing-list-member-retirement/.gitignore
@@ -0,0 +1,2 @@
+# Compiled binary:
+mailing-list-active-members
diff --git a/scripts/mailing-list-member-retirement/go.mod b/scripts/mailing-list-member-retirement/go.mod
new file mode 100644
index 0000000..800eac0
--- /dev/null
+++ b/scripts/mailing-list-member-retirement/go.mod
@@ -0,0 +1,8 @@
+module github.com/fsi-tue/mailing-list-active-members
+
+go 1.14
+
+require (
+	github.com/emersion/go-mbox v1.0.0
+	github.com/emersion/go-message v0.12.0
+)
diff --git a/scripts/mailing-list-member-retirement/go.sum b/scripts/mailing-list-member-retirement/go.sum
new file mode 100644
index 0000000..59050d5
--- /dev/null
+++ b/scripts/mailing-list-member-retirement/go.sum
@@ -0,0 +1,16 @@
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/emersion/go-mbox v1.0.0 h1:HN6aKbyqmgIfK9fS/gen+NRr2wXLSxZXWfdAIAnzQPc=
+github.com/emersion/go-mbox v1.0.0/go.mod h1:Yp9IVuuOYLEuMv4yjgDHvhb5mHOcYH6x92Oas3QqEZI=
+github.com/emersion/go-message v0.12.0 h1:mZnv35eZ6lB6EftTQBgYXspOH0FQdhpFhSUhA9i6/Zg=
+github.com/emersion/go-message v0.12.0/go.mod h1:C4jnca5HOTo4bGN9YdqNQM9sITuT3Y0K6bSUw9RklvY=
+github.com/emersion/go-textwrapper v0.0.0-20160606182133-d0e65e56babe h1:40SWqY0zE3qCi6ZrtTf5OUdNm5lDnGnjRSq9GgmeTrg=
+github.com/emersion/go-textwrapper v0.0.0-20160606182133-d0e65e56babe/go.mod h1:aqO8z8wPrjkscevZJFVE1wXJrLpC5LtJG7fqLOsPb2U=
+github.com/martinlindhe/base36 v1.0.0 h1:eYsumTah144C0A8P1T/AVSUk5ZoLnhfYFM3OGQxB52A=
+github.com/martinlindhe/base36 v1.0.0/go.mod h1:+AtEs8xrBpCeYgSLoY/aJ6Wf37jtBuR0s35750M27+8=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
+golang.org/x/text v0.3.2 h1:tW2bmiBqwgJj/UpqtC8EpXEZVYOwU0yG4iWbprSVAcs=
+golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
diff --git a/scripts/mailing-list-member-retirement/main.go b/scripts/mailing-list-member-retirement/main.go
new file mode 100644
index 0000000..7ce7867
--- /dev/null
+++ b/scripts/mailing-list-member-retirement/main.go
@@ -0,0 +1,80 @@
+package main
+
+import (
+	"bufio"
+	"flag"
+	"fmt"
+	"io"
+	"log"
+	"os"
+	"strings"
+	"github.com/emersion/go-mbox"
+	"github.com/emersion/go-message/mail"
+	_ "github.com/emersion/go-message/charset"
+)
+
+// Prints the email addresses (one per line) of all senders by parsing an MBOX.
+
+func main() {
+	mboxNamePtr := flag.String("mbox", "test.mbox", "MBOX to read")
+	flag.Parse()
+	PrintAllMboxSenders(*mboxNamePtr)
+}
+
+func PrintAllMboxSenders(fileName string) {
+	f, err := os.Open(fileName)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer func() {
+		if err = f.Close(); err != nil {
+			log.Fatal(err)
+		}
+	}()
+	fr := bufio.NewReader(f)
+	mr := mbox.NewReader(fr)
+	for {
+		r, err := mr.NextMessage()
+		if err == io.EOF {
+			break
+		} else if err != nil {
+			log.Fatal(err)
+		}
+		PrintMessageSender(r)
+	}
+}
+
+func PrintMessageSender(r io.Reader) {
+	mr, err := mail.CreateReader(r)
+	if err != nil {
+		if err.Error() == "charset \"cp-850\": ianaindex: invalid encoding name" {
+			fmt.Fprintf(os.Stderr, "Ignored a mail due to an invalid charset\n")
+			return // TODO: Print message ID
+		}
+		log.Fatal(err)
+	}
+
+	addr, err := mr.Header.AddressList("From")
+	if err != nil {
+		if strings.Contains(err.Error(), "invalid utf-8 in quoted-string") {
+			addr := strings.TrimPrefix(err.Error(), "mail: missing word in phrase: mail: invalid utf-8 in quoted-string: ")
+			fmt.Fprintf(os.Stderr, "Ignored due to invalid UTF-8 encoding: %v\n", addr)
+			return
+		} else if err.Error() == "mail: missing @ in addr-spec" {
+			fmt.Fprintf(os.Stderr, "Ignored a sender due to missing @\n")
+			return // TODO: Print invalid address
+		} else if err.Error() == "mail: no angle-addr" {
+			fmt.Fprintf(os.Stderr, "Ignored a mail due to no angle-address\n")
+			return // TODO: Print message ID
+		}
+		log.Fatal(err)
+	} else if len(addr) != 1 {
+		if len(addr) == 0 {
+			fmt.Fprintf(os.Stderr, "Ignored a mail due to a missing sender\n")
+			return // TODO: Print message ID
+		}
+		fmt.Fprintf(os.Stderr, "A mail has an unexpected number of senders: %v\n", len(addr))
+		return // TODO: Print message ID
+	}
+	fmt.Println(addr[0].Address)
+}
diff --git a/scripts/mailing-list-member-retirement/test.mbox b/scripts/mailing-list-member-retirement/test.mbox
new file mode 100644
index 0000000..d5fd851
--- /dev/null
+++ b/scripts/mailing-list-member-retirement/test.mbox
@@ -0,0 +1,17 @@
+From herp.derp@example.com Thu Jan  1 00:00:01 2015
+From: herp.derp@example.com (Herp Derp)
+Date: Thu, 01 Jan 2015 00:00:01 +0100
+Subject: Test
+
+This is a simple test.
+
+CU.
+
+From derp.herp@example.com Thu Jan  1 00:00:01 2015
+From: derp.herp@example.com (Derp Herp)
+Date: Thu, 02 Jan 2015 00:00:01 +0100
+Subject: Another test
+
+This is another simple test.
+
+Bye.