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|
use antidote::RwLock;
use circular_queue::CircularQueue;
use regex::{Regex, RegexBuilder};
use std::collections::HashMap;
use irc::client::prelude::*;
use plugin::*;
use self::error::*;
use error::ErrorKind as FrippyErrorKind;
use error::FrippyError;
use failure::Fail;
use failure::ResultExt;
lazy_static! {
static ref RE: Regex = Regex::new(r"^s/((?:\\/|[^/])+)/((?:\\/|[^/])*)/(?:(\w+))?\s*$").unwrap();
}
#[derive(PluginName, Debug)]
pub struct Sed {
per_channel: usize,
channel_messages: RwLock<HashMap<String, CircularQueue<String>>>,
}
impl Sed {
pub fn new(per_channel: usize) -> Sed {
Sed {
per_channel,
channel_messages: RwLock::new(HashMap::new()),
}
}
fn add_message(&self, channel: String, message: String) {
let mut channel_messages = self.channel_messages.write();
let messages = channel_messages
.entry(channel)
.or_insert_with(|| CircularQueue::with_capacity(self.per_channel));
messages.push(message);
}
fn format_escaped(&self, input: &str) -> String {
let mut output = String::with_capacity(input.len());
let mut escape = false;
for c in input.chars() {
if escape && !r"/\".contains(c) {
output.push('\\');
} else if !escape && c == '\\' {
escape = true;
continue;
}
escape = false;
output.push(c);
}
output
}
fn run_regex(&self, channel: &str, message: &str) -> Result<String, SedError> {
let mut global_match = false;
let mut case_insens = false;
let mut ign_whitespace = false;
let mut swap_greed = false;
let mut enable_unicode = true;
let captures = RE.captures(message).unwrap();
debug!("{:?}", captures);
let first = self.format_escaped(captures.get(1).unwrap().as_str());
let second = self.format_escaped(captures.get(2).unwrap().as_str());
if let Some(flags) = captures.get(3) {
let flags = flags.as_str();
global_match = flags.contains('g');
case_insens = flags.contains('i');
ign_whitespace = flags.contains('x');
swap_greed = flags.contains('U');
enable_unicode = !flags.contains('u');
}
let user_re = RegexBuilder::new(&first)
.case_insensitive(case_insens)
.ignore_whitespace(ign_whitespace)
.unicode(enable_unicode)
.swap_greed(swap_greed)
.build()
.context(ErrorKind::InvalidRegex)?;
let channel_messages = self.channel_messages.read();
let messages = channel_messages.get(channel).ok_or(ErrorKind::NoMessages)?;
for message in messages.iter() {
if user_re.is_match(message) {
let response = if global_match {
user_re.replace_all(message, &second[..])
} else {
user_re.replace(message, &second[..])
};
return Ok(response.to_string());
}
}
Err(ErrorKind::NoMatch)?
}
}
impl Plugin for Sed {
fn execute(&self, client: &IrcClient, message: &Message) -> ExecutionStatus {
match message.command {
Command::PRIVMSG(_, ref content) => {
let channel = message.response_target().unwrap();
if channel == message.source_nickname().unwrap() {
return ExecutionStatus::Done;
}
if RE.is_match(content) {
let result = match self.run_regex(channel, content) {
Ok(msg) => client.send_privmsg(channel, &msg),
Err(e) => match e.kind() {
ErrorKind::InvalidRegex => {
let err = e.cause().unwrap().to_string();
client.send_notice(channel, &err.replace('\n', "\r\n"))
}
_ => client.send_notice(channel, &e.to_string()),
},
};
match result {
Err(e) => {
ExecutionStatus::Err(e.context(FrippyErrorKind::Connection).into())
}
Ok(_) => ExecutionStatus::Done,
}
} else {
self.add_message(channel.to_string(), content.to_string());
ExecutionStatus::Done
}
}
_ => ExecutionStatus::Done,
}
}
fn execute_threaded(&self, _: &IrcClient, _: &Message) -> Result<(), FrippyError> {
panic!("Sed should not use threading")
}
fn command(&self, client: &IrcClient, command: PluginCommand) -> Result<(), FrippyError> {
client
.send_notice(
&command.source,
"Currently this Plugin does not implement any commands.",
)
.context(FrippyErrorKind::Connection)?;
Ok(())
}
fn evaluate(&self, _: &IrcClient, _: PluginCommand) -> Result<String, String> {
Err(String::from(
"Evaluation of commands is not implemented for sed at this time",
))
}
}
pub mod error {
#[derive(Copy, Clone, Eq, PartialEq, Debug, Fail, Error)]
#[error = "SedError"]
pub enum ErrorKind {
/// Invalid regex error
#[fail(display = "Invalid regex")]
InvalidRegex,
/// No messages found error
#[fail(display = "No messages were found for this channel")]
NoMessages,
/// No match found error
#[fail(display = "No recent messages match this regex")]
NoMatch,
}
}
|
