Send emails using the sendmail program

Usage example:

if sendmail_is_available then
    var mail = new Mail("", "Title", "Content") ""
else print "please install sendmail"

Introduced classes

class Mail

sendmail :: Mail

An email to be sent using sendmail

Redefined classes

redef class Sys

sendmail :: sendmail $ Sys

The main class of the program.

All class definitions

class Mail

sendmail $ Mail

An email to be sent using sendmail
redef class Sys

sendmail :: sendmail $ Sys

The main class of the program.
package_diagram sendmail::sendmail sendmail base64 base64 sendmail::sendmail->base64 core core base64->core ...core ... ...core->core a_star-m a_star-m a_star-m->sendmail::sendmail


module abstract_collection

core :: abstract_collection

Abstract collection classes and services.
module abstract_text

core :: abstract_text

Abstract class for manipulation of sequences of characters
module array

core :: array

This module introduces the standard array structure.
module bitset

core :: bitset

Services to handle BitSet
module bytes

core :: bytes

Services for byte streams and arrays
module circular_array

core :: circular_array

Efficient data structure to access both end of the sequence.
module codec_base

core :: codec_base

Base for codecs to use with streams
module codecs

core :: codecs

Group module for all codec-related manipulations
module collection

core :: collection

This module define several collection classes.
module core

core :: core

Standard classes and methods used by default by Nit programs and libraries.
module environ

core :: environ

Access to the environment variables of the process
module error

core :: error

Standard error-management infrastructure.
module exec

core :: exec

Invocation and management of operating system sub-processes.
module file

core :: file

File manipulations (create, read, write, etc.)
module fixed_ints

core :: fixed_ints

Basic integers of fixed-precision
module fixed_ints_text

core :: fixed_ints_text

Text services to complement fixed_ints
module flat

core :: flat

All the array-based text representations
module gc

core :: gc

Access to the Nit internal garbage collection mechanism
module hash_collection

core :: hash_collection

Introduce HashMap and HashSet.
module iso8859_1

core :: iso8859_1

Codec for ISO8859-1 I/O
module kernel

core :: kernel

Most basic classes and methods.
module list

core :: list

This module handle double linked lists
module math

core :: math

Mathematical operations
module native

core :: native

Native structures for text and bytes
module numeric

core :: numeric

Advanced services for Numeric types
module protocol

core :: protocol

module queue

core :: queue

Queuing data structures and wrappers
module range

core :: range

Module for range of discrete objects.
module re

core :: re

Regular expression support for all services based on Pattern
module ropes

core :: ropes

Tree-based representation of a String.
module sorter

core :: sorter

This module contains classes used to compare things and sorts arrays.
module stream

core :: stream

Input and output streams of characters
module text

core :: text

All the classes and methods related to the manipulation of text entities
module time

core :: time

Management of time and dates
module union_find

core :: union_find

union–find algorithm using an efficient disjoint-set data structure
module utf8

core :: utf8

Codec for UTF-8 I/O


module base64

base64 :: base64

Offers the base 64 encoding and decoding algorithms


module a_star-m


# Send emails using the `sendmail` program
# Usage example:
# ~~~~
# if sendmail_is_available then
#     var mail = new Mail("", "Title", "Content")
# ""
#     mail.send
# else print "please install sendmail"
# ~~~~
module sendmail

import base64

# Can we find the external program `sendmail`?
fun sendmail_is_available: Bool do return "sendmail".program_is_in_path

# An email to be sent using `sendmail`
class Mail

	# Sender of this email
	var from: String is writable

	# Recipients of the message
	var to = new Array[String]

	# Recipients of a carbon copy of the message
	var cc = new Array[String]

	# Recipients of a blind carbon copy of the message
	var bcc = new Array[String]

	# Subject of this mail
	var subject: String is writable

	# Content of this mail
	var content: String is writable

	# Metadata in the header of this mail
	var header = new HashMap[String, String]

	# Should the content of this email be encrypted using base64?
	# This will also set the header `Content-Transfer-Encoding` to base64.
	# By default, the encoding is 8bit.
	var encrypt_with_base64 = false

	# Send this mail using the `sendmail` command
	# require: `sendmail_is_available`
	fun send: Bool
		assert sendmail_is_available

		# All recipients
		var all = new Array[String]
		all.add_all to
		all.add_all cc
		all.add_all bcc

		var proc = new ProcessWriter("sendmail", all.join(","))
		if proc.is_writable then proc.write to_s
		var status = proc.status
		return status == 0

	redef fun to_s
		# Set encoding (and encode if needed)
		var content = content
		var encoding
		if encrypt_with_base64 then
			content = content.encode_base64
			encoding = "base64"
			encoding = "8bit"
		header["Content-Transfer-Encoding"] = encoding

		# Generate expected format
		return """
From: {{{from}}}\r
To: {{{to.join(",")}}}\r
CC: {{{cc.join(",")}}}\r
BCC: {{{bcc.join(",")}}}\r
Subject: {{{subject}}}\r
{{{header.join("\r\n", ": ")}}}\r\n\r