MeiliSearch/examples/query-database.rs

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Rust
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use std::io::{self, Write};
use std::path::PathBuf;
use std::error::Error;
use termcolor::{Color, ColorChoice, ColorSpec, StandardStream, WriteColor};
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use serde_derive::{Serialize, Deserialize};
use structopt::StructOpt;
use meilidb::database::Database;
use meilidb::Match;
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#[derive(Debug, StructOpt)]
pub struct Opt {
/// The destination where the database must be created
#[structopt(parse(from_os_str))]
pub database_path: PathBuf,
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/// The number of returned results
#[structopt(short = "n", long = "number-results", default_value = "10")]
pub number_results: usize,
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}
#[derive(Debug, Serialize, Deserialize)]
struct Document {
id: String,
title: String,
description: String,
image: String,
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}
fn display_highlights(text: &str, ranges: &[usize]) -> io::Result<()> {
let mut stdout = StandardStream::stdout(ColorChoice::Always);
let mut highlighted = false;
for range in ranges.windows(2) {
let [start, end] = match range { [start, end] => [*start, *end], _ => unreachable!() };
if highlighted {
stdout.set_color(ColorSpec::new().set_fg(Some(Color::Yellow)))?;
}
write!(&mut stdout, "{}", &text[start..end])?;
stdout.reset()?;
highlighted = !highlighted;
}
Ok(())
}
fn create_highlight_areas(text: &str, matches: &[Match], attribute: u16) -> Vec<usize> {
let mut title_areas = Vec::new();
title_areas.push(0);
for match_ in matches {
if match_.attribute.attribute() == attribute {
let word_area = match_.word_area;
let byte_index = word_area.byte_index() as usize;
let length = word_area.length() as usize;
title_areas.push(byte_index);
title_areas.push(byte_index + length);
}
}
title_areas.push(text.len());
title_areas
}
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fn main() -> Result<(), Box<Error>> {
let opt = Opt::from_args();
let (elapsed, result) = elapsed::measure_time(|| Database::open(&opt.database_path));
let database = result?;
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println!("database prepared for you in {}", elapsed);
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let mut buffer = String::new();
let input = io::stdin();
loop {
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print!("Searching for: ");
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io::stdout().flush()?;
if input.read_line(&mut buffer)? == 0 { break }
let query = buffer.trim_end_matches('\n');
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let view = database.view();
let (elapsed, documents) = elapsed::measure_time(|| {
let builder = view.query_builder().unwrap();
builder.query(query, 0..opt.number_results)
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});
let number_of_documents = documents.len();
for doc in documents {
match view.document_by_id::<Document>(doc.id) {
Ok(document) => {
print!("title: ");
let title_areas = create_highlight_areas(&document.title, &doc.matches, 1);
display_highlights(&document.title, &title_areas)?;
println!();
print!("description: ");
let description_areas = create_highlight_areas(&document.description, &doc.matches, 2);
display_highlights(&document.description, &description_areas)?;
println!();
},
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Err(e) => eprintln!("{}", e),
}
}
println!("Found {} results in {}", number_of_documents, elapsed);
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buffer.clear();
}
Ok(())
}