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use std::io;
use rusqlite;
use crate::db;
use crate::ed;
use crate::error;
use crate::user;
// Executes the sql statement that inserts a new post
// Broken off for unit testing.
pub fn exec_new(stmt: &mut rusqlite::Statement, title: &str, body: &str) -> error::Result<()> {
stmt.execute_named(&[
(":title", &title),
(":author", &*user::NAME),
(":body", &body),
])?;
Ok(())
}
// Make sure nobody encodes narsty characters
// into a message to negatively affect other
// users
fn str_to_utf8(str: &str) -> String {
str.chars()
.map(|c| {
let mut buf = [0; 4];
c.encode_utf8(&mut buf).to_string()
})
.collect::<String>()
}
// First handler for creating a new post.
pub fn create(db: &db::Conn) -> error::Result<()> {
let mut stmt = db
.conn
.prepare("INSERT INTO posts (title, author, body) VALUES (:title, :author, :body)")?;
println!();
println!("Title of the new post: ");
let mut title = String::new();
io::stdin().read_line(&mut title)?;
let title = str_to_utf8(title.trim());
let title = if title.len() > 30 {
&title[..30]
} else {
&title
};
println!();
let body = str_to_utf8(&ed::call());
let body = if body.len() > 500 {
&body[..500]
} else {
&body
};
exec_new(&mut stmt, title, body)?;
println!();
Ok(())
}
// Shows the most recent posts.
pub fn display(db: &db::Conn) -> error::Result<()> {
let mut stmt = db.conn.prepare("SELECT * FROM posts")?;
let out = stmt.query_map(rusqlite::NO_PARAMS, |row| {
let id: u32 = row.get(0)?;
let title: String = row.get(1)?;
let author: String = row.get(2)?;
let body: String = row.get(3)?;
Ok(db::Post {
id,
title,
author,
body,
})
})?;
let mut postvec = Vec::new();
out.for_each(|row| {
if let Ok(post) = row {
postvec.push(format!(
"{}. {} -> by {}\n{}\n",
post.id, post.title, post.author, post.body
));
}
});
for (i, e) in postvec.iter().enumerate() {
if (postvec.len() > 14 && i >= postvec.len() - 15) || postvec.len() < 15 {
print!("{}", e);
}
}
Ok(())
}
// First handler to update posts.
pub fn update_handler(db: &db::Conn, id: u32) -> error::Result<()> {
let id_num_in = if id == 0 {
println!();
println!("ID number of your post to edit?");
let mut id_num_in = String::new();
io::stdin().read_line(&mut id_num_in)?;
id_num_in.trim().parse()?
} else {
id
};
let mut get_stmt = db.conn.prepare("SELECT * FROM posts WHERE id = :id")?;
let row = get_stmt.query_row_named(&[(":id", &id_num_in)], |row| {
let title: String = row.get(1)?;
let author = row.get(2)?;
let body = row.get(3)?;
Ok(vec![title, author, body])
})?;
if *user::NAME != row[1] {
println!();
println!("Username mismatch - can't update_handler post!");
return Ok(());
}
let mut new_title = String::new();
let mut new_body = String::new();
println!("Updating post {}", id_num_in);
println!();
println!("Title: {}\n\nBody: {}", row[0], row[2]);
println!();
println!("Enter new title:");
io::stdin().read_line(&mut new_title)?;
println!();
println!("Enter new body:");
io::stdin().read_line(&mut new_body)?;
println!();
update(&new_title, &new_body, id_num_in, &db)?;
Ok(())
}
// Allows editing of posts - called by main::update
pub fn update(new_title: &str, new_body: &str, id_num_in: u32, db: &db::Conn) -> error::Result<()> {
let new_title = new_title.trim();
let new_body = new_body.trim();
let title_stmt = format!("UPDATE posts SET title = :title WHERE id = {}", id_num_in);
let mut stmt = db.conn.prepare(&title_stmt)?;
stmt.execute_named(&[(":title", &new_title)])?;
let body_stmt = format!("UPDATE posts SET body = :body WHERE id = {}", id_num_in);
let mut stmt = db.conn.prepare(&body_stmt)?;
stmt.execute_named(&[(":body", &new_body)])?;
Ok(())
}
// Helper to just run a sql statement.
pub fn exec_stmt_no_params(stmt: &mut rusqlite::Statement) -> error::Result<()> {
stmt.execute(rusqlite::NO_PARAMS)?;
Ok(())
}
// First handler to remove a post
pub fn delete_handler(db: &db::Conn, id: u32) -> error::Result<()> {
let id_num_in: u32 = if id == 0 {
println!();
println!("ID of the post to delete?");
let mut id_num_in = String::new();
io::stdin().read_line(&mut id_num_in)?;
id_num_in.trim().parse()?
} else {
id
};
let del_stmt = format!("DELETE FROM posts WHERE id = {}", id_num_in);
let get_stmt = format!("SELECT * FROM posts WHERE id = {}", id_num_in);
let mut get_stmt = db.conn.prepare(&get_stmt)?;
let mut del_stmt = db.conn.prepare(&del_stmt)?;
let user_in_post: String = get_stmt.query_row(rusqlite::NO_PARAMS, |row| row.get(2))?;
if *user::NAME != user_in_post {
println!();
println!("Users don't match. Can't delete!");
println!();
return Ok(());
}
exec_stmt_no_params(&mut del_stmt)?;
Ok(())
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn post_new() {
let db = db::Conn::init("/tmp/clinte.db");
let db = db::Conn { conn: db };
let mut stmt = db
.conn
.prepare("INSERT INTO posts (title, author, body) VALUES (:title, :author, :body)")
.unwrap();
let title = String::from("TEST TITLE");
exec_new(&mut stmt, &title, "TEST BODY").unwrap();
update("NEW TITLE", "TEST BODY", 1, &db).unwrap();
let mut stmt = db
.conn
.prepare("SELECT * FROM posts WHERE title = :title")
.unwrap();
let title = String::from("NEW TITLE");
let out: String = stmt
.query_row_named(&[(":title", &title)], |row| row.get::<usize, String>(1))
.unwrap();
assert_eq!("NEW TITLE", &out);
}
}
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