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|
use anyhow::Result;
use crossterm::{
style::Stylize,
terminal::{size, Clear, ClearType},
ExecutableCommand,
};
use std::{
io::{self, StdoutLock, Write},
process::Output,
};
use crate::{
app_state::{AppState, ExercisesProgress},
progress_bar::progress_bar,
};
pub struct WatchState<'a> {
writer: StdoutLock<'a>,
app_state: &'a mut AppState,
stdout: Option<Vec<u8>>,
stderr: Option<Vec<u8>>,
show_hint: bool,
show_done: bool,
}
impl<'a> WatchState<'a> {
pub fn new(app_state: &'a mut AppState) -> Self {
let writer = io::stdout().lock();
Self {
writer,
app_state,
stdout: None,
stderr: None,
show_hint: false,
show_done: false,
}
}
#[inline]
pub fn into_writer(self) -> StdoutLock<'a> {
self.writer
}
pub fn run_current_exercise(&mut self) -> Result<()> {
self.show_hint = false;
let output = self.app_state.current_exercise().run()?;
self.stdout = Some(output.stdout);
if output.status.success() {
self.stderr = None;
self.show_done = true;
} else {
self.app_state
.set_pending(self.app_state.current_exercise_ind())?;
self.stderr = Some(output.stderr);
self.show_done = false;
}
self.render()
}
pub fn run_exercise_with_ind(&mut self, exercise_ind: usize) -> Result<()> {
self.app_state.set_current_exercise_ind(exercise_ind)?;
self.run_current_exercise()
}
pub fn next_exercise(&mut self) -> Result<ExercisesProgress> {
if !self.show_done {
self.writer
.write_all(b"The current exercise isn't done yet\n")?;
self.show_prompt()?;
return Ok(ExercisesProgress::Pending);
}
self.app_state.done_current_exercise(&mut self.writer)
}
fn show_prompt(&mut self) -> io::Result<()> {
self.writer.write_all(b"\n")?;
if self.show_done {
self.writer.write_fmt(format_args!("{}ext/", 'n'.bold()))?;
}
if !self.show_hint {
self.writer.write_fmt(format_args!("{}int/", 'h'.bold()))?;
}
self.writer
.write_fmt(format_args!("{}ist/{}uit? ", 'l'.bold(), 'q'.bold()))?;
self.writer.flush()
}
pub fn render(&mut self) -> Result<()> {
// Prevent having the first line shifted.
self.writer.write_all(b"\n")?;
self.writer.execute(Clear(ClearType::All))?;
if let Some(stdout) = &self.stdout {
self.writer.write_all(stdout)?;
self.writer.write_all(b"\n")?;
}
if let Some(stderr) = &self.stderr {
self.writer.write_all(stderr)?;
self.writer.write_all(b"\n")?;
}
self.writer.write_all(b"\n")?;
if self.show_hint {
self.writer.write_fmt(format_args!(
"{}\n{}\n\n",
"Hint".bold().cyan().underlined(),
self.app_state.current_exercise().hint,
))?;
}
if self.show_done {
self.writer.write_fmt(format_args!(
"{}\n\n",
"Exercise done ✓
When you are done experimenting, enter `n` or `next` to go to the next exercise 🦀"
.bold()
.green(),
))?;
}
let line_width = size()?.0;
let progress_bar = progress_bar(
self.app_state.n_done(),
self.app_state.exercises().len() as u16,
line_width,
)?;
self.writer.write_fmt(format_args!(
"{progress_bar}Current exercise: {}\n",
self.app_state
.current_exercise()
.path
.to_string_lossy()
.bold(),
))?;
self.show_prompt()?;
Ok(())
}
pub fn show_hint(&mut self) -> Result<()> {
self.show_hint = true;
self.render()
}
pub fn handle_invalid_cmd(&mut self, cmd: &str) -> io::Result<()> {
self.writer.write_all(b"Invalid command: ")?;
self.writer.write_all(cmd.as_bytes())?;
if cmd.len() > 1 {
self.writer
.write_all(b" (confusing input can occur after resizing the terminal)")?;
}
self.writer.write_all(b"\n")?;
self.show_prompt()
}
}
|
