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|
use anyhow::{Context, Result};
use crossterm::{
style::{Attribute, ContentStyle, Stylize},
terminal::{size, Clear, ClearType},
ExecutableCommand,
};
use std::{
fmt::Write as _,
io::{self, StdoutLock, Write as _},
};
use crate::{
exercise::{Exercise, State},
progress_bar::progress_bar,
state_file::StateFile,
};
pub struct WatchState<'a> {
writer: StdoutLock<'a>,
exercises: &'static [Exercise],
exercise: &'static Exercise,
current_exercise_ind: usize,
progress: u16,
stdout: Option<Vec<u8>>,
stderr: Option<Vec<u8>>,
message: Option<String>,
prompt: Vec<u8>,
}
impl<'a> WatchState<'a> {
pub fn new(state_file: &StateFile, exercises: &'static [Exercise]) -> Self {
let current_exercise_ind = state_file.next_exercise_ind();
let progress = state_file.progress().iter().filter(|done| **done).count() as u16;
let exercise = &exercises[current_exercise_ind];
let writer = io::stdout().lock();
let prompt = format!(
"\n\n{}int/{}lear/{}ist/{}uit? ",
"h".bold(),
"c".bold(),
"l".bold(),
"q".bold(),
)
.into_bytes();
Self {
writer,
exercises,
exercise,
current_exercise_ind,
progress,
stdout: None,
stderr: None,
message: None,
prompt,
}
}
#[inline]
pub fn into_writer(self) -> StdoutLock<'a> {
self.writer
}
pub fn run_exercise(&mut self) -> Result<bool> {
let output = self.exercise.run()?;
self.stdout = Some(output.stdout);
if !output.status.success() {
self.stderr = Some(output.stderr);
return Ok(false);
}
self.stderr = None;
if let State::Pending(context) = self.exercise.state()? {
let mut message = format!(
"
You can keep working on this exercise or jump into the next one by removing the {} comment:
",
"`I AM NOT DONE`".bold(),
);
for context_line in context {
let formatted_line = if context_line.important {
context_line.line.bold()
} else {
context_line.line.stylize()
};
writeln!(
message,
"{:>2} {} {}",
ContentStyle {
foreground_color: Some(crossterm::style::Color::Blue),
background_color: None,
underline_color: None,
attributes: Attribute::Bold.into()
}
.apply(context_line.number),
"|".blue(),
formatted_line,
)?;
}
self.message = Some(message);
return Ok(false);
}
Ok(true)
}
pub fn run_exercise_with_ind(&mut self, exercise_ind: usize) -> Result<bool> {
self.exercise = self
.exercises
.get(exercise_ind)
.context("Invalid exercise index")?;
self.current_exercise_ind = exercise_ind;
self.run_exercise()
}
pub fn show_prompt(&mut self) -> io::Result<()> {
self.writer.write_all(&self.prompt)?;
self.writer.flush()
}
pub fn render(&mut self) -> Result<()> {
// Prevent having the first line shifted after clearing because of the prompt.
self.writer.write_all(b"\n")?;
self.writer.execute(Clear(ClearType::All))?;
if let Some(stdout) = &self.stdout {
self.writer.write_all(stdout)?;
}
if let Some(stderr) = &self.stderr {
self.writer.write_all(stderr)?;
}
if let Some(message) = &self.message {
self.writer.write_all(message.as_bytes())?;
}
self.writer.write_all(b"\n")?;
let line_width = size()?.0;
let progress_bar = progress_bar(self.progress, self.exercises.len() as u16, line_width)?;
self.writer.write_all(progress_bar.as_bytes())?;
self.show_prompt()?;
Ok(())
}
pub fn show_hint(&mut self) -> io::Result<()> {
self.writer.write_all(self.exercise.hint.as_bytes())?;
self.show_prompt()
}
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.show_prompt()
}
}
|
