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use anyhow::Result;
use crossterm::{
style::{
Attribute, Attributes, Color, ResetColor, SetAttribute, SetAttributes, SetForegroundColor,
},
terminal, QueueableCommand,
};
use std::io::{self, StdoutLock, Write};
use crate::{
app_state::{AppState, ExercisesProgress},
clear_terminal,
exercise::{solution_link_line, RunnableExercise, OUTPUT_CAPACITY},
term::progress_bar,
};
#[derive(PartialEq, Eq)]
enum DoneStatus {
DoneWithSolution(String),
DoneWithoutSolution,
Pending,
}
pub struct WatchState<'a> {
app_state: &'a mut AppState,
output: Vec<u8>,
show_hint: bool,
done_status: DoneStatus,
manual_run: bool,
}
impl<'a> WatchState<'a> {
pub fn new(app_state: &'a mut AppState, manual_run: bool) -> Self {
Self {
app_state,
output: Vec::with_capacity(OUTPUT_CAPACITY),
show_hint: false,
done_status: DoneStatus::Pending,
manual_run,
}
}
pub fn run_current_exercise(&mut self, stdout: &mut StdoutLock) -> Result<()> {
self.show_hint = false;
writeln!(
stdout,
"\nChecking the exercise `{}`. Please wait…",
self.app_state.current_exercise().name,
)?;
let success = self
.app_state
.current_exercise()
.run_exercise(Some(&mut self.output), self.app_state.cmd_runner())?;
self.output.push(b'\n');
if success {
self.done_status =
if let Some(solution_path) = self.app_state.current_solution_path()? {
DoneStatus::DoneWithSolution(solution_path)
} else {
DoneStatus::DoneWithoutSolution
};
} else {
self.app_state
.set_pending(self.app_state.current_exercise_ind())?;
self.done_status = DoneStatus::Pending;
}
self.render(stdout)?;
Ok(())
}
pub fn handle_file_change(
&mut self,
exercise_ind: usize,
stdout: &mut StdoutLock,
) -> Result<()> {
// Don't skip exercises on file changes to avoid confusion from missing exercises.
// Skipping exercises must be explicit in the interactive list.
// But going back to an earlier exercise on file change is fine.
if self.app_state.current_exercise_ind() < exercise_ind {
return Ok(());
}
self.app_state.set_current_exercise_ind(exercise_ind)?;
self.run_current_exercise(stdout)
}
/// Move on to the next exercise if the current one is done.
pub fn next_exercise(&mut self, stdout: &mut StdoutLock) -> Result<ExercisesProgress> {
if self.done_status == DoneStatus::Pending {
return Ok(ExercisesProgress::CurrentPending);
}
self.app_state.done_current_exercise(stdout)
}
fn show_prompt(&self, stdout: &mut StdoutLock) -> io::Result<()> {
if self.manual_run {
stdout.queue(SetAttribute(Attribute::Bold))?;
stdout.write_all(b"r")?;
stdout.queue(ResetColor)?;
stdout.write_all(b":run / ")?;
}
if self.done_status != DoneStatus::Pending {
stdout.queue(SetAttribute(Attribute::Bold))?;
stdout.write_all(b"n")?;
stdout.queue(ResetColor)?;
stdout.write_all(b":")?;
stdout.queue(SetAttribute(Attribute::Underlined))?;
stdout.write_all(b"next")?;
stdout.queue(ResetColor)?;
stdout.write_all(b" / ")?;
}
if !self.show_hint {
stdout.queue(SetAttribute(Attribute::Bold))?;
stdout.write_all(b"h")?;
stdout.queue(ResetColor)?;
stdout.write_all(b":hint / ")?;
}
stdout.queue(SetAttribute(Attribute::Bold))?;
stdout.write_all(b"l")?;
stdout.queue(ResetColor)?;
stdout.write_all(b":list / ")?;
stdout.queue(SetAttribute(Attribute::Bold))?;
stdout.write_all(b"q")?;
stdout.queue(ResetColor)?;
stdout.write_all(b":quit ? ")?;
stdout.flush()
}
pub fn render(&self, stdout: &mut StdoutLock) -> io::Result<()> {
// Prevent having the first line shifted if clearing wasn't successful.
stdout.write_all(b"\n")?;
clear_terminal(stdout)?;
stdout.write_all(&self.output)?;
if self.show_hint {
stdout
.queue(SetAttributes(
Attributes::from(Attribute::Bold).with(Attribute::Underlined),
))?
.queue(SetForegroundColor(Color::Cyan))?;
stdout.write_all(b"Hint")?;
stdout.queue(ResetColor)?;
stdout.write_all(b"\n")?;
stdout.write_all(self.app_state.current_exercise().hint.as_bytes())?;
stdout.write_all(b"\n\n")?;
}
if self.done_status != DoneStatus::Pending {
stdout
.queue(SetAttribute(Attribute::Bold))?
.queue(SetForegroundColor(Color::Green))?;
stdout.write_all("Exercise done ✓".as_bytes())?;
stdout.queue(ResetColor)?;
stdout.write_all(b"\n")?;
if let DoneStatus::DoneWithSolution(solution_path) = &self.done_status {
solution_link_line(stdout, solution_path)?;
}
stdout.write_all(
"When done experimenting, enter `n` to move on to the next exercise 🦀\n\n"
.as_bytes(),
)?;
}
let line_width = terminal::size()?.0;
progress_bar(
stdout,
self.app_state.n_done(),
self.app_state.exercises().len() as u16,
line_width,
)?;
stdout.write_all(b"\nCurrent exercise: ")?;
self.app_state
.current_exercise()
.terminal_file_link(stdout)?;
stdout.write_all(b"\n\n")?;
self.show_prompt(stdout)?;
Ok(())
}
pub fn show_hint(&mut self, stdout: &mut StdoutLock) -> io::Result<()> {
if !self.show_hint {
self.show_hint = true;
self.render(stdout)?;
}
Ok(())
}
}
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