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|
use crate::{
db, deck,
model::{DbEntry, Line, Question},
};
use anyhow::Result;
use rusqlite::Connection;
use std::collections::HashSet;
pub fn run(conn: &mut Connection, deck_path: &str) -> Result<()> {
let db_entries = db::all(conn)?;
let lines = deck::read(deck_path)?;
let Diff {
new,
deleted,
undeleted,
} = diff(db_entries, lines);
db::insert(conn, &new)?;
db::delete(conn, &deleted)?;
db::undelete(conn, &undeleted)?;
Ok(())
}
struct Diff {
pub new: Vec<Question>,
pub deleted: Vec<Question>,
pub undeleted: Vec<Question>,
}
fn diff(db_entries: Vec<DbEntry>, lines: Vec<Line>) -> Diff {
let mut file_questions: HashSet<Question> = HashSet::new();
let mut db_questions_not_deleted: HashSet<Question> = HashSet::new();
let mut db_questions_deleted: HashSet<Question> = HashSet::new();
for Line { part_1, part_2 } in lines {
for question in part_1.clone() {
let mut responses = part_2.clone();
responses.sort();
file_questions.insert(Question {
question,
responses,
});
}
for question in part_2 {
let mut responses = part_1.clone();
responses.sort();
file_questions.insert(Question {
question,
responses,
});
}
}
for DbEntry {
question,
mut responses,
deleted,
} in db_entries
{
responses.sort();
if deleted.is_some() {
db_questions_deleted.insert(Question {
question,
responses,
});
} else {
db_questions_not_deleted.insert(Question {
question,
responses,
});
}
}
let new = file_questions
.difference(&db_questions_not_deleted)
.cloned()
.collect::<HashSet<Question>>()
.difference(&db_questions_deleted)
.cloned()
.collect();
let deleted = db_questions_not_deleted
.difference(&file_questions)
.cloned()
.collect();
let undeleted = file_questions
.intersection(&db_questions_deleted)
.cloned()
.collect();
Diff {
new,
deleted,
undeleted,
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn sync() {
let db_entries = vec![
DbEntry {
question: "A".to_string(),
responses: vec!["A".to_string()],
deleted: None,
},
DbEntry {
question: "B".to_string(),
responses: vec!["B".to_string()],
deleted: None,
},
DbEntry {
question: "C".to_string(),
responses: vec!["C".to_string()],
deleted: Some(0),
},
DbEntry {
question: "D".to_string(),
responses: vec!["D".to_string()],
deleted: Some(0),
},
];
let lines = vec![
Line {
part_1: vec!["A".to_string()],
part_2: vec!["A".to_string()],
},
Line {
part_1: vec!["C".to_string()],
part_2: vec!["C".to_string()],
},
Line {
part_1: vec!["E".to_string()],
part_2: vec!["E".to_string()],
},
];
let Res {
new,
deleted,
undeleted,
} = sync(db_entries, lines);
assert_eq!(
new,
vec!(Question {
question: "E".to_string(),
responses: vec!("E".to_string())
})
);
assert_eq!(
deleted,
vec!(Question {
question: "B".to_string(),
responses: vec!("B".to_string())
})
);
assert_eq!(
undeleted,
vec!(Question {
question: "C".to_string(),
responses: vec!("C".to_string())
})
);
}
}
|
