Add TUI, resolve #19, #17, #16 (#21)

4 files changed, 307 insertions, 0 deletions

diff --git a/src/command/event.rs b/src/command/event.rs
new file mode 100644
index 00000000..b205be70
--- /dev/null
+++ b/src/command/event.rs
@@ -0,0 +1,68 @@
+use std::sync::mpsc;
+use std::thread;
+use std::time::Duration;
+
+use termion::event::Key;
+use termion::input::TermRead;
+
+pub enum Event<I> {
+    Input(I),
+    Tick,
+}
+
+/// A small event handler that wrap termion input and tick events. Each event
+/// type is handled in its own thread and returned to a common `Receiver`
+pub struct Events {
+    rx: mpsc::Receiver<Event<Key>>,
+}
+
+#[derive(Debug, Clone, Copy)]
+pub struct Config {
+    pub exit_key: Key,
+    pub tick_rate: Duration,
+}
+
+impl Default for Config {
+    fn default() -> Config {
+        Config {
+            exit_key: Key::Char('q'),
+            tick_rate: Duration::from_millis(250),
+        }
+    }
+}
+
+impl Events {
+    pub fn new() -> Events {
+        Events::with_config(Config::default())
+    }
+
+    pub fn with_config(config: Config) -> Events {
+        let (tx, rx) = mpsc::channel();
+
+        {
+            let tx = tx.clone();
+            thread::spawn(move || {
+                let tty = termion::get_tty().expect("Could not find tty");
+                for key in tty.keys().flatten() {
+                    if let Err(err) = tx.send(Event::Input(key)) {
+                        eprintln!("{}", err);
+                        return;
+                    }
+                }
+            })
+        };
+
+        thread::spawn(move || loop {
+            if tx.send(Event::Tick).is_err() {
+                break;
+            }
+            thread::sleep(config.tick_rate);
+        });
+
+        Events { rx }
+    }
+
+    pub fn next(&self) -> Result<Event<Key>, mpsc::RecvError> {
+        self.rx.recv()
+    }
+}
diff --git a/src/command/history.rs b/src/command/history.rs
index bd440163..af8aef7d 100644
--- a/src/command/history.rs
+++ b/src/command/history.rs
@@ -35,6 +35,12 @@ pub enum Cmd {
         #[structopt(long, short)]
         session: bool,
     },
+
+    #[structopt(
+        about="search for a command",
+        aliases=&["se", "sea", "sear", "searc"],
+    )]
+    Search { query: Vec<String> },
 }
 
 fn print_list(h: &[History]) {
@@ -102,6 +108,13 @@ impl Cmd {
 
                 Ok(())
             }
+
+            Self::Search { query } => {
+                let history = db.prefix_search(&query.join(""))?;
+                print_list(&history);
+
+                Ok(())
+            }
         }
     }
 }
diff --git a/src/command/mod.rs b/src/command/mod.rs
index c74b138f..3ebb92e0 100644
--- a/src/command/mod.rs
+++ b/src/command/mod.rs
@@ -5,9 +5,11 @@ use uuid::Uuid;
 use crate::local::database::Database;
 use crate::settings::Settings;
 
+mod event;
 mod history;
 mod import;
 mod init;
+mod search;
 mod server;
 mod stats;
 
@@ -33,6 +35,9 @@ pub enum AtuinCmd {
 
     #[structopt(about = "generates a UUID")]
     Uuid,
+
+    #[structopt(about = "interactive history search")]
+    Search { query: Vec<String> },
 }
 
 pub fn uuid_v4() -> String {
@@ -47,6 +52,7 @@ impl AtuinCmd {
             Self::Server(server) => server.run(),
             Self::Stats(stats) => stats.run(db, settings),
             Self::Init => init::init(),
+            Self::Search { query } => search::run(&query, db),
 
             Self::Uuid => {
                 println!("{}", uuid_v4());
diff --git a/src/command/search.rs b/src/command/search.rs
new file mode 100644
index 00000000..d51e29ef
--- /dev/null
+++ b/src/command/search.rs
@@ -0,0 +1,220 @@
+use eyre::Result;
+use itertools::Itertools;
+use std::io::stdout;
+use termion::{event::Key, input::MouseTerminal, raw::IntoRawMode, screen::AlternateScreen};
+use tui::{
+    backend::TermionBackend,
+    layout::{Alignment, Constraint, Corner, Direction, Layout},
+    style::{Color, Modifier, Style},
+    text::{Span, Spans, Text},
+    widgets::{Block, Borders, List, ListItem, ListState, Paragraph},
+    Terminal,
+};
+use unicode_width::UnicodeWidthStr;
+
+use crate::command::event::{Event, Events};
+use crate::local::database::Database;
+use crate::local::history::History;
+
+const VERSION: &str = env!("CARGO_PKG_VERSION");
+
+struct State {
+    input: String,
+
+    results: Vec<History>,
+
+    results_state: ListState,
+}
+
+fn query_results(app: &mut State, db: &mut impl Database) {
+    let results = match app.input.as_str() {
+        "" => db.list(),
+        i => db.prefix_search(i),
+    };
+
+    if let Ok(results) = results {
+        app.results = results.into_iter().rev().unique().collect();
+    }
+
+    if app.results.is_empty() {
+        app.results_state.select(None);
+    } else {
+        app.results_state.select(Some(0));
+    }
+}
+
+fn key_handler(input: Key, db: &mut impl Database, app: &mut State) -> Option<String> {
+    match input {
+        Key::Esc | Key::Char('\n') => {
+            let i = app.results_state.selected().unwrap_or(0);
+
+            return Some(app.results.get(i).unwrap().command.clone());
+        }
+        Key::Char(c) => {
+            app.input.push(c);
+            query_results(app, db);
+        }
+        Key::Backspace => {
+            app.input.pop();
+            query_results(app, db);
+        }
+        Key::Down => {
+            let i = match app.results_state.selected() {
+                Some(i) => {
+                    if i == 0 {
+                        0
+                    } else {
+                        i - 1
+                    }
+                }
+                None => 0,
+            };
+            app.results_state.select(Some(i));
+        }
+        Key::Up => {
+            let i = match app.results_state.selected() {
+                Some(i) => {
+                    if i >= app.results.len() - 1 {
+                        app.results.len() - 1
+                    } else {
+                        i + 1
+                    }
+                }
+                None => 0,
+            };
+            app.results_state.select(Some(i));
+        }
+        _ => {}
+    };
+
+    None
+}
+
+// this is a big blob of horrible! clean it up!
+// for now, it works. But it'd be great if it were more easily readable, and
+// modular. I'd like to add some more stats and stuff at some point
+#[allow(clippy::clippy::cast_possible_truncation)]
+fn select_history(query: &[String], db: &mut impl Database) -> Result<String> {
+    let stdout = stdout().into_raw_mode()?;
+    let stdout = MouseTerminal::from(stdout);
+    let stdout = AlternateScreen::from(stdout);
+    let backend = TermionBackend::new(stdout);
+    let mut terminal = Terminal::new(backend)?;
+
+    // Setup event handlers
+    let events = Events::new();
+
+    let mut app = State {
+        input: query.join(" "),
+        results: Vec::new(),
+        results_state: ListState::default(),
+    };
+
+    query_results(&mut app, db);
+
+    loop {
+        // Handle input
+        if let Event::Input(input) = events.next()? {
+            if let Some(output) = key_handler(input, db, &mut app) {
+                return Ok(output);
+            }
+        }
+
+        terminal.draw(|f| {
+            let chunks = Layout::default()
+                .direction(Direction::Vertical)
+                .margin(1)
+                .constraints(
+                    [
+                        Constraint::Length(2),
+                        Constraint::Min(1),
+                        Constraint::Length(3),
+                    ]
+                    .as_ref(),
+                )
+                .split(f.size());
+
+            let top_chunks = Layout::default()
+                .direction(Direction::Horizontal)
+                .constraints([Constraint::Percentage(50), Constraint::Percentage(50)].as_ref())
+                .split(chunks[0]);
+
+            let top_left_chunks = Layout::default()
+                .direction(Direction::Vertical)
+                .constraints([Constraint::Length(1), Constraint::Length(1)].as_ref())
+                .split(top_chunks[0]);
+
+            let top_right_chunks = Layout::default()
+                .direction(Direction::Vertical)
+                .constraints([Constraint::Length(1), Constraint::Length(1)].as_ref())
+                .split(top_chunks[1]);
+
+            let title = Paragraph::new(Text::from(Span::styled(
+                format!("A'tuin v{}", VERSION),
+                Style::default().add_modifier(Modifier::BOLD),
+            )));
+
+            let help = vec![
+                Span::raw("Press "),
+                Span::styled("Esc", Style::default().add_modifier(Modifier::BOLD)),
+                Span::raw(" to exit."),
+            ];
+
+            let help = Text::from(Spans::from(help));
+            let help = Paragraph::new(help);
+
+            let input = Paragraph::new(app.input.as_ref())
+                .block(Block::default().borders(Borders::ALL).title("Search"));
+
+            let results: Vec<ListItem> = app
+                .results
+                .iter()
+                .enumerate()
+                .map(|(i, m)| {
+                    let mut content = Span::raw(m.command.to_string());
+
+                    if let Some(selected) = app.results_state.selected() {
+                        if selected == i {
+                            content.style =
+                                Style::default().fg(Color::Red).add_modifier(Modifier::BOLD);
+                        }
+                    }
+
+                    ListItem::new(content)
+                })
+                .collect();
+
+            let results = List::new(results)
+                .block(Block::default().borders(Borders::ALL).title("History"))
+                .start_corner(Corner::BottomLeft)
+                .highlight_symbol(">> ");
+
+            let stats = Paragraph::new(Text::from(Span::raw(format!(
+                "history count: {}",
+                db.history_count().unwrap()
+            ))))
+            .alignment(Alignment::Right);
+
+            f.render_widget(title, top_left_chunks[0]);
+            f.render_widget(help, top_left_chunks[1]);
+
+            f.render_widget(stats, top_right_chunks[0]);
+            f.render_stateful_widget(results, chunks[1], &mut app.results_state);
+            f.render_widget(input, chunks[2]);
+
+            f.set_cursor(
+                // Put cursor past the end of the input text
+                chunks[2].x + app.input.width() as u16 + 1,
+                // Move one line down, from the border to the input line
+                chunks[2].y + 1,
+            );
+        })?;
+    }
+}
+
+pub fn run(query: &[String], db: &mut impl Database) -> Result<()> {
+    let item = select_history(query, db)?;
+    eprintln!("{}", item);
+
+    Ok(())
+}