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use std::env;
use std::error::{self, Error};
use std::io::{self, BufRead, BufReader, Write};
use std::fmt;
use std::fs::{File, OpenOptions};
use std::path::Path;
#[cfg(test)]
mod tests;
struct Alias {
alias: String,
name: String,
email: String,
}
impl Alias {
fn new(email: &str) -> Alias {
let mut split: Vec<&str> = email.split_whitespace().collect();
// Remove "From: "
split.remove(0);
let mut alias = String::new();
let mut name = String::new();
let mut email = String::new();
if split.len() == 1 {
alias = split[0].to_lowercase().to_string();
email = split[0].to_string();
} else if split.len() == 2 {
alias = split[0].to_lowercase().to_string();
name = split[0].to_string();
email = split[1].to_string();
} else if split.len() > 2 {
alias = format!("{}-{}", split[split.len() - 2], split[0]).to_lowercase().to_string();
name = split[0..(split.len() - 1)].join(" ");
email = split[split.len() - 1].to_string();
}
alias = alias.replace(',', "");
alias = alias.replace('\'', "");
alias = alias.replace('"', "");
Alias { alias: alias, name: name, email: email }
}
fn to_string(&self) -> String {
if self.name.is_empty() {
format!("alias {} {}", self.alias, self.email)
} else {
format!("alias {} {} {}", self.alias, self.name, self.email)
}
}
fn write_to_file<P: AsRef<Path>>(&self, file: P) -> Result<(), io::Error> {
let mut f = try!(OpenOptions::new().append(true).open(file));
try!(f.write_all(format!("{}\n", self.to_string()).as_bytes()));
Ok(())
}
fn update_alias_id(&mut self, similar_aliases: Vec<String>) {
if !similar_aliases.is_empty() {
self.alias = format!("{}-{}", self.alias, similar_aliases.len() + 1);
}
}
}
fn write_alias<P: AsRef<Path>>(from: String, file: P) -> Result<(), AliasSearchError> {
let mut alias = Alias::new(&from);
let similar_aliases = try!(find_alias_in_file(&alias, &file));
alias.update_alias_id(similar_aliases);
try!(alias.write_to_file(&file));
Ok(())
}
#[derive(Debug)]
enum AliasSearchError {
NotFound,
EmailExists,
Io(io::Error),
}
impl fmt::Display for AliasSearchError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
AliasSearchError::NotFound => writeln!(f, "{}", self.description()),
AliasSearchError::EmailExists => writeln!(f, "{}", self.description()),
AliasSearchError::Io(ref err) => writeln!(f, "IO error: {}", err),
}
}
}
impl error::Error for AliasSearchError {
fn description(&self) -> &str {
match *self {
AliasSearchError::NotFound => "Alias could not be found in aliases file",
AliasSearchError::EmailExists => "Email already exists in aliases file",
AliasSearchError::Io(ref err) => err.description(),
}
}
fn cause(&self) -> Option<&error::Error> {
match *self {
AliasSearchError::Io(ref err) => Some(err),
_ => None,
}
}
}
impl From<io::Error> for AliasSearchError {
fn from(err: io::Error) -> AliasSearchError {
AliasSearchError::Io(err)
}
}
#[cfg(test)]
impl PartialEq<AliasSearchError> for AliasSearchError {
fn eq(&self, other: &AliasSearchError) -> bool {
match *self {
AliasSearchError::NotFound => match *other {
AliasSearchError::NotFound => true,
_ => false,
},
AliasSearchError::EmailExists => match *other {
AliasSearchError::EmailExists => true,
_ => false,
},
AliasSearchError::Io(_) => match *other {
AliasSearchError::Io(_) => true,
_ => false,
},
}
}
}
fn find_alias_in_file<P: AsRef<Path>>(alias: &Alias, file: P) -> Result<Vec<String>, AliasSearchError> {
let mut matches = Vec::new();
let f = try!(File::open(file));
let file = BufReader::new(&f);
for line in file.lines() {
let line = try!(line);
let split: Vec<&str> = line.split_whitespace().collect();
if line.contains(&alias.email) {
return Err(AliasSearchError::EmailExists)
}
if split[1].starts_with(&alias.alias) {
matches.push(split[1].to_owned());
}
}
if matches.is_empty() {
Err(AliasSearchError::NotFound)
} else {
Ok(matches)
}
}
fn print_usage(program: &str) {
println!("Usage: {} FILE", program);
}
fn main() {
let args: Vec<String> = env::args().collect();
let program = args[0].clone();
let file = if args.len() > 1 {
&args[1]
} else {
print_usage(&program);
return;
};
let stdin = io::stdin();
for line in stdin.lock().lines() {
let line = line.unwrap();
// Write the message to STDOUT so that it can be properly read by Mutt
println!("{}", line);
if line.starts_with("From: ") {
match write_alias(line, &file) {
Ok(_) => continue,
Err(e @ AliasSearchError::NotFound) | Err(e @ AliasSearchError::EmailExists) =>
io::stderr().write(e.to_string().as_bytes()).ok(),
Err(e) => io::stderr().write(e.to_string().as_bytes()).ok(),
};
}
}
}
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