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use chrono::{DateTime, FixedOffset, ParseError, Local}; use self::super::{read_toml_file, write_toml_file}; use self::super::super::Error; use std::iter::FromIterator; use std::cmp::Ordering; use std::path::Path; /// A leaderboard entry. /// /// # Examples /// /// Reading a leaderboard, adding an entry to it, then writing it back. /// /// ``` /// # use std::fs::{File, create_dir_all}; /// # use poke_a_mango::ops::Leader; /// # use std::env::temp_dir; /// let tf = temp_dir().join("poke-a-mango-doctest").join("ops-Leader-0"); /// create_dir_all(&tf).unwrap(); /// /// let tf = tf.join("leaderboard.toml"); /// File::create(&tf).unwrap(); /// /// let mut leaders = Leader::read(&tf).unwrap(); /// assert!(leaders.is_empty()); /// leaders.push(Leader::now("nabijaczleweli".to_string(), 105)); /// assert_eq!(Leader::write(leaders, &tf), Ok(())); /// ``` /// /// This could alternatively be done with `Leader::append()`. #[derive(Debug, Clone, Hash, PartialEq, Eq, RustcEncodable, RustcDecodable)] pub struct Leader { /// Name the user entered when prompted. pub name: String, /// Time the score was achieved. pub time: DateTime<FixedOffset>, /// User's score. pub score: u64, } #[derive(Debug, Clone, Hash, PartialEq, Eq, RustcEncodable, RustcDecodable)] struct LeaderForSerialisation { name: String, time: String, score: u64, } #[derive(Debug, Clone, Hash, PartialEq, Eq, RustcEncodable, RustcDecodable)] struct Leaders { leader: Vec<LeaderForSerialisation>, } impl Leader { /// Create a new leaderboard entry with `time` set to now. /// /// # Examples /// /// ``` /// # use poke_a_mango::ops::Leader; /// let ldr = Leader::now("nabijaczleweli".to_string(), 36); /// assert_eq!(ldr.name, "nabijaczleweli"); /// assert_eq!(ldr.score, 36); /// ``` pub fn now(name: String, score: u64) -> Leader { let now = Local::now(); Leader { name: name, time: now.with_timezone(now.offset()), score: score, } } /// Read leaderboard from the specified file. /// /// If the specified file doesn't exist an empty leaderboard is returned. /// /// # Examples /// /// ``` /// # use std::fs::{File, create_dir_all}; /// # use poke_a_mango::ops::Leader; /// # use std::env::temp_dir; /// let tf = temp_dir().join("poke-a-mango-doctest").join("ops-Leader-read-0"); /// create_dir_all(&tf).unwrap(); /// /// let tf = tf.join("leaderboard.toml"); /// File::create(&tf).unwrap(); /// /// assert_eq!(Leader::read(&tf), Ok(vec![])); /// ``` pub fn read(p: &Path) -> Result<Vec<Leader>, Error> { if p.exists() { let queued_leaders: Leaders = try!(read_toml_file(p, "leaderboard")); Ok(Result::from_iter(queued_leaders.leader.into_iter().map(|qts| qts.into()).collect::<Vec<_>>()).unwrap()) } else { Ok(vec![]) } } /// Save leaderboard to the specified file. /// /// # Examples /// /// ``` /// # extern crate poke_a_mango; /// # extern crate chrono; /// # use std::fs::{File, create_dir_all}; /// # use self::chrono::{Duration, Local}; /// # use self::poke_a_mango::ops::Leader; /// # use std::env::temp_dir; /// # fn main() { /// let tf = temp_dir().join("poke-a-mango-doctest").join("ops-Leader-write-0"); /// create_dir_all(&tf).unwrap(); /// /// Leader::write(vec![Leader::now("nabijaczleweli".to_string(), 105), /// Leader::now("skorezore".to_string(), 51)], /// &tf.join("leaderboard.toml")) /// .unwrap(); /// # } /// ``` pub fn write(queued_leaders: Vec<Leader>, p: &Path) -> Result<(), Error> { write_toml_file(&Leaders { leader: queued_leaders.into_iter().map(LeaderForSerialisation::from).collect() }, p, "leaderboard") } /// Append the specified leader to the leaderboard file at the specified path. /// /// This is equivalent to reading it, appending the leader, properly sorting and writing it back. /// /// # Examples /// /// ``` /// # extern crate poke_a_mango; /// # extern crate chrono; /// # use std::fs::{File, create_dir_all}; /// # use self::chrono::{Duration, Local}; /// # use self::poke_a_mango::ops::Leader; /// # use std::env::temp_dir; /// # fn main() { /// let tf = temp_dir().join("poke-a-mango-doctest").join("ops-Leader-append-0"); /// create_dir_all(&tf).unwrap(); /// /// assert_eq!(Leader::append(Leader::now("nabijaczleweli".to_string(), 105), &tf.join("leaderboard.toml")), Ok(())); /// # } /// ``` pub fn append(ldr: Leader, p: &Path) -> Result<(), Error> { let mut leaderboard = try!(Leader::read(p)); leaderboard.push(ldr); leaderboard.sort(); leaderboard.reverse(); try!(Leader::write(leaderboard, p)); Ok(()) } } impl Ord for Leader { fn cmp(&self, other: &Self) -> Ordering { self.score.cmp(&other.score) } } impl PartialOrd for Leader { fn partial_cmp(&self, other: &Self) -> Option<Ordering> { self.score.partial_cmp(&other.score) } } impl From<Leader> for LeaderForSerialisation { fn from(qt: Leader) -> LeaderForSerialisation { LeaderForSerialisation { name: qt.name, time: qt.time.to_rfc3339(), score: qt.score, } } } impl Into<Result<Leader, ParseError>> for LeaderForSerialisation { fn into(self) -> Result<Leader, ParseError> { Ok(Leader { name: self.name, time: try!(DateTime::parse_from_rfc3339(&self.time)), score: self.score, }) } }