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|
//! broot's app is mainly a stack of AppState.
//! Commands parsed from the input are submitted to the current
//! appstate, which replies with a stateCmdResult which may
//! be
//! - a transition to a new state
//! - a pop to get back to the previous one
//! - an operation which keeps the state
//! - a request to quit broot
//! - a request to launch an executable (thus leaving broot)
use crossterm::TerminalInput;
use std::io::{self, Write};
use std::result::Result;
use std::sync::atomic::{AtomicUsize, Ordering};
use std::sync::{mpsc, Arc};
use std::thread;
use crate::app_context::AppContext;
use crate::browser_states::BrowserState;
use crate::command_parsing::parse_command_sequence;
use crate::commands::Command;
use crate::event::{Event, EventSource};
use crate::errors::ProgramError;
use crate::errors::TreeBuildError;
use crate::external::Launchable;
use crate::input::Input;
use crate::screens::Screen;
use crate::skin::Skin;
use crate::spinner::Spinner;
use crate::status::Status;
use crate::task_sync::TaskLifetime;
/// Result of applying a command to a state
pub enum AppStateCmdResult {
Quit,
Keep,
Launch(Launchable),
DisplayError(String),
NewState(Box<dyn AppState>, Command),
PopStateAndReapply, // the state asks the command be executed on a previous state
PopState,
RefreshState,
}
impl AppStateCmdResult {
pub fn verb_not_found(text: &str) -> AppStateCmdResult {
AppStateCmdResult::DisplayError(format!("verb not found: {:?}", &text))
}
pub fn from_optional_state(
os: Result<Option<BrowserState>, TreeBuildError>,
cmd: Command,
) -> AppStateCmdResult {
match os {
Ok(Some(os)) => AppStateCmdResult::NewState(Box::new(os), cmd),
Ok(None) => AppStateCmdResult::Keep,
Err(e) => AppStateCmdResult::DisplayError(e.to_string()),
}
}
}
/// a whole application state, stackable to allow reverting
/// to a previous one
pub trait AppState {
fn apply(
&mut self,
cmd: &mut Command,
screen: &mut Screen,
con: &AppContext,
) -> io::Result<AppStateCmdResult>;
fn refresh(&mut self, screen: &Screen, con: &AppContext) -> Command;
fn has_pending_tasks(&self) -> bool;
fn do_pending_task(&mut self, screen: &mut Screen, tl: &TaskLifetime);
fn display(&mut self, screen: &mut Screen, con: &AppContext) -> io::Result<()>;
fn write_status(&self, screen: &mut Screen, cmd: &Command, con: &AppContext) -> io::Result<()>;
fn write_flags(&self, screen: &mut Screen, con: &AppContext) -> io::Result<()>;
}
pub struct App {
states: Vec<Box<dyn AppState>>, // stack: the last one is current
quitting: bool,
launch_at_end: Option<Launchable>, // what must be launched after end
}
impl App {
pub fn new() -> App {
App {
states: Vec::new(),
quitting: false,
launch_at_end: None,
}
}
pub fn push(&mut self, new_state: Box<dyn AppState>) {
self.states.push(new_state);
}
fn mut_state(&mut self) -> &mut Box<dyn AppState> {
match self.states.last_mut() {
Some(s) => s,
None => {
panic!("No path has been pushed");
}
}
}
fn state(&self) -> &Box<dyn AppState> {
match self.states.last() {
Some(s) => s,
None => {
panic!("No path has been pushed");
}
}
}
/// execute all the pending tasks until there's none remaining or
/// the allowed lifetime is expired (usually when the user typed a new key)
fn do_pending_tasks(
&mut self,
cmd: &Command,
screen: &mut Screen,
con: &AppContext,
tl: TaskLifetime,
) -> io::Result<()> {
let has_task = self.state().has_pending_tasks();
if has_task {
loop {
self.mut_state().display(screen, con)?;
self.state().write_status(screen, &cmd, con)?;
screen.write_spinner(true)?;
if tl.is_expired() {
break;
}
self.mut_state().do_pending_task(screen, &tl);
if !self.state().has_pending_tasks() {
break;
}
}
screen.write_spinner(false)?;
}
self.mut_state().display(screen, con)?;
self.mut_state().write_status(screen, &cmd, con)?;
Ok(())
}
/// apply a command, and returns a command, which may be the same (modified or not)
/// or a new one.
/// This normally mutates self
fn apply_command(
&mut self,
cmd: Command,
screen: &mut Screen,
con: &AppContext,
) -> io::Result<Command> {
let mut cmd = cmd;
debug!("action: {:?}", &cmd.action);
screen.read_size(con)?;
screen.write_input(&cmd)?;
self.state().write_flags(screen, con)?;
screen.write_spinner(false)?;
match self.mut_state().apply(&mut cmd, screen, con)? {
AppStateCmdResult::Quit => {
debug!("cmd result quit");
self.quitting = true;
}
AppStateCmdResult::Launch(launchable) => {
self.launch_at_end = Some(launchable);
self.quitting = true;
}
AppStateCmdResult::NewState(boxed_state, new_cmd) => {
self.push(boxed_state);
cmd = new_cmd;
self.state().write_status(screen, &cmd, con)?;
}
AppStateCmdResult::RefreshState => {
cmd = self.mut_state().refresh(screen, con);
}
AppStateCmdResult::PopState => {
if self.states.len() == 1 {
debug!("quitting on last pop state");
self.quitting = true;
} else {
self.states.pop();
cmd = self.mut_state().refresh(screen, con);
self.state().write_status(screen, &cmd, con)?;
}
}
AppStateCmdResult::PopStateAndReapply => {
if self.states.len() == 1 {
debug!("quitting on last pop state");
self.quitting = true;
} else {
self.states.pop();
debug!("about to reapply {:?}", &cmd);
return self.apply_command(cmd, screen, con);
}
}
AppStateCmdResult::DisplayError(txt) => {
screen.write_status_err(&txt)?;
}
AppStateCmdResult::Keep => {
self.state().write_status(screen, &cmd, con)?;
}
}
screen.write_input(&cmd)?;
self.state().write_flags(screen, con)?;
Ok(cmd)
}
/// This is the main loop of the application
pub fn run(mut self, con: &AppContext, skin: Skin) -> Result<Option<Launchable>, ProgramError> {
let mut screen = Screen::new(con, skin)?;
// create the initial state
if let Some(bs) = BrowserState::new(
con.launch_args.root.clone(),
con.launch_args.tree_options.clone(),
&screen,
&TaskLifetime::unlimited(),
)? {
self.push(Box::new(bs));
} else {
unreachable!();
}
let mut cmd = Command::new();
// if some commands were passed to the application
// we execute them before even starting listening for events
if let Some(unparsed_commands) = &con.launch_args.commands {
let commands = parse_command_sequence(unparsed_commands, con)?;
for arg_cmd in &commands {
cmd = (*arg_cmd).clone();
cmd = self.apply_command(cmd, &mut screen, con)?;
self.do_pending_tasks(&cmd, &
|