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// Copyright (c) 2021 Teddy Wing
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
use anyhow::{anyhow, Context, Error};
use exitcode;
use mailparse;
use thiserror;
use whatlang::{self, Lang};
use xdg;
use std::fs::File;
use std::io::{self, Read, Write};
use std::process;
const PROGRAM_NAME: &'static str = "ottolangy";
/// Filename used for the generated attribution config file.
const MUTTRC_FILENAME: &'static str = "attribution.muttrc";
/// French attribution config.
const ATTRIBUTION_FR: &'static str =
r#"set attribution = "Le %{%e %b. %Y à %H:%M %Z}, %f a écrit:"
"#;
/// English attribution config.
const ATTRIBUTION_EN: &'static str =
r#"set attribution = "On %{%b %e, %Y, at %I:%M %p %Z}, %f wrote:"
"#;
#[derive(thiserror::Error, Debug)]
enum OttolangyError {
#[error("unable to parse email body: {0}")]
ParseMail(#[from] mailparse::MailParseError),
#[error("unable to parse email body")]
ParseMailUnknown,
#[error(transparent)]
Xdg(#[from] xdg::BaseDirectoriesError),
#[error(transparent)]
Io(#[from] std::io::Error),
}
// TODO: exit codes
fn main() {
match run() {
Ok(_) => (),
Err(e) => {
eprintln!("{}: error: {}", PROGRAM_NAME, e);
match e.downcast_ref::<OttolangyError>() {
Some(OttolangyError::ParseMail(_)) =>
process::exit(exitcode::DATAERR),
Some(OttolangyError::ParseMailUnknown) =>
process::exit(exitcode::DATAERR),
Some(OttolangyError::Xdg(_)) => process::exit(exitcode::IOERR),
Some(OttolangyError::Io(_)) => process::exit(exitcode::IOERR),
None => process::exit(exitcode::UNAVAILABLE),
}
},
}
}
/// Get an email from standard input and write a Mutt attribution config based
/// on the language.
fn run() -> Result<(), Error> {
let mut email_input: Vec<u8> = Vec::new();
let mut stdin = io::stdin();
stdin.read_to_end(&mut email_input)
.context("failed to read from stdin")?;
let body = get_email_body(&email_input)
.context("failed to parse email body")?;
let lang_info = whatlang::detect(&body)
.ok_or(anyhow!("unable to detect language"))?;
let attribution_config = if lang_info.lang() == Lang::Fra {
ATTRIBUTION_FR
} else {
ATTRIBUTION_EN
};
write_attribution(&attribution_config)
.context("failed to write attribution config file")?;
Ok(())
}
/// Extract the body from an email.
///
/// Given an email as input, parses it and extracts the body. For multipart
/// emails, the body is extracted from the text part.
fn get_email_body(email: &[u8]) -> Result<String, OttolangyError> {
let email = mailparse::parse_mail(&email)?;
if email.subparts.is_empty() {
let body = email.get_body()?;
return Ok(body);
}
for part in email.subparts {
for header in part.get_headers() {
if header.get_key() == "Content-Type"
&& header.get_value().starts_with("text/plain")
{
return Ok(part.get_body()?);
}
}
}
Err(OttolangyError::ParseMailUnknown)
}
/// Write the attribution config to a file.
///
/// Store the file in the XDG data directory.
fn write_attribution(config: &str) -> Result<(), OttolangyError> {
let xdg_dirs = xdg::BaseDirectories::with_prefix(PROGRAM_NAME)?;
let muttrc_path = xdg_dirs.place_data_file(MUTTRC_FILENAME)?;
let mut file = File::create(muttrc_path)?;
file.write_all(config.as_bytes())?;
Ok(())
}
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