Parsing lines of text from external file in Ruby - ruby

Question

I am trying to parse a raw email. The desired result is a hash of the lines that contain specific headers.
This is the Ruby file:
raw_email = File.open("sample-email.txt", "r")
parsed_email = Hash.new('')
raw_email.each do |line|
puts line
header = line.chomp(":")
puts header
if header == "Delivered-To"
parsed_email[:to] = line
elsif header == "From"
parsed_email[:from] = line
elsif header == "Date"
parsed_email[:date] = line
elsif header == "Subject"
parsed_email[:subject] = line
end
end
puts parsed_email
And this is the raw email:
Delivered-To: user1#example.com
From: John Doe <user2#example.com>
Date: Tue, 12 Dec 2017 13:30:14 -0500
Subject: Testing the parser
To: user1#example.com
Content-Type: multipart/alternative;
boundary="123456789abcdefghijklmnopqrs"
--123456789abcdefghijklmnopqrs
Content-Type: text/plain; charset="UTF-8"
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer nec
odio. Praesent libero. Sed cursus ante dapibus diam. Sed nisi. Nulla
quis sem at nibh elementum imperdiet. Duis sagittis ipsum.
--123456789abcdefghijklmnopqrs
Content-Type: text/html; charset="UTF-8"
<div dir="ltr">Lorem ipsum dolor sit amet, consectetur adipiscing
elit. Integer nec odio. Praesent libero. Sed cursus ante dapibus diam.
Sed nisi. Nulla quis sem at nibh elementum imperdiet. Duis sagittis
ipsum.<br clear="all">
</div>
--089e082c24dc944a9f056028d791--
The puts statements are just for my own testing to see if data is being passed along.
What I am getting is each full line put twice and an empty hash put at the end.
I have also tried changing different bits to strings or arrays and I've also tried using line.split(":", 1) instead of line.chomp(":")
Can someone please explain why this isn't working?

Answer 1

Try this
raw_email = File.open("sample-email.txt", "r")
parsed_email = {}
raw_email.each do |line|
case line.split(":")[0]
when "Delivered-To"
parsed_email[:to] = line
when "From"
parsed_email[:from] = line
when "Date"
parsed_email[:date] = line
when "Subject"
parsed_email[:subject] = line
end
end
puts parsed_email
=> {:to=>"Delivered-To: user1#example.com\n", :from=>"From: John Doe <user2#example.com>\n", :date=>"Date: Tue, 12 Dec 2017 13:30:14 -0500\n", :subject=>"Subject: Testing the parser\n"}
Explanation
You need to split line on : and select first. Like this line.split(":")[0]