mirror of
https://github.com/rust-lang/rustlings.git
synced 2024-12-26 00:00:03 +03:00
472 lines
16 KiB
Rust
472 lines
16 KiB
Rust
use anyhow::{bail, Context, Result};
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use crossterm::style::Stylize;
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use serde::Deserialize;
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use std::{
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fs::{self, File},
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io::{Read, StdoutLock, Write},
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path::{Path, PathBuf},
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process::{Command, Stdio},
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};
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use crate::{
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clear_terminal,
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embedded::EMBEDDED_FILES,
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exercise::{Exercise, OUTPUT_CAPACITY},
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info_file::ExerciseInfo,
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DEBUG_PROFILE,
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};
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const STATE_FILE_NAME: &str = ".rustlings-state.txt";
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const BAD_INDEX_ERR: &str = "The current exercise index is higher than the number of exercises";
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#[must_use]
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pub enum ExercisesProgress {
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AllDone,
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Pending,
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}
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pub enum StateFileStatus {
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Read,
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NotRead,
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}
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// Parses parts of the output of `cargo metadata`.
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#[derive(Deserialize)]
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struct CargoMetadata {
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target_directory: PathBuf,
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}
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pub struct AppState {
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current_exercise_ind: usize,
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exercises: Vec<Exercise>,
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// Caches the number of done exercises to avoid iterating over all exercises every time.
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n_done: u16,
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final_message: String,
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// Preallocated buffer for reading and writing the state file.
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file_buf: Vec<u8>,
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official_exercises: bool,
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// Cargo's target directory.
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target_dir: PathBuf,
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}
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impl AppState {
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// Update the app state from the state file.
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fn update_from_file(&mut self) -> StateFileStatus {
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self.file_buf.clear();
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self.n_done = 0;
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if File::open(STATE_FILE_NAME)
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.and_then(|mut file| file.read_to_end(&mut self.file_buf))
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.is_err()
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{
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return StateFileStatus::NotRead;
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}
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// See `Self::write` for more information about the file format.
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let mut lines = self.file_buf.split(|c| *c == b'\n').skip(2);
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let Some(current_exercise_name) = lines.next() else {
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return StateFileStatus::NotRead;
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};
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if current_exercise_name.is_empty() || lines.next().is_none() {
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return StateFileStatus::NotRead;
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}
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let mut done_exercises = hashbrown::HashSet::with_capacity(self.exercises.len());
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for done_exerise_name in lines {
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if done_exerise_name.is_empty() {
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break;
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}
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done_exercises.insert(done_exerise_name);
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}
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for (ind, exercise) in self.exercises.iter_mut().enumerate() {
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if done_exercises.contains(exercise.name.as_bytes()) {
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exercise.done = true;
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self.n_done += 1;
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}
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if exercise.name.as_bytes() == current_exercise_name {
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self.current_exercise_ind = ind;
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}
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}
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StateFileStatus::Read
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}
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pub fn new(
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exercise_infos: Vec<ExerciseInfo>,
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final_message: String,
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) -> Result<(Self, StateFileStatus)> {
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// Get the target directory from Cargo.
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let metadata_output = Command::new("cargo")
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.arg("metadata")
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.arg("-q")
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.arg("--format-version")
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.arg("1")
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.arg("--no-deps")
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.stdin(Stdio::null())
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.stderr(Stdio::inherit())
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.output()
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.context(CARGO_METADATA_ERR)?
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.stdout;
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let target_dir = serde_json::de::from_slice::<CargoMetadata>(&metadata_output)
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.context(
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"Failed to read the field `target_directory` from the `cargo metadata` output",
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)?
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.target_directory;
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let exercises = exercise_infos
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.into_iter()
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.map(Exercise::from)
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.collect::<Vec<_>>();
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let mut slf = Self {
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current_exercise_ind: 0,
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exercises,
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n_done: 0,
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final_message,
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file_buf: Vec::with_capacity(2048),
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official_exercises: !Path::new("info.toml").exists(),
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target_dir,
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};
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let state_file_status = slf.update_from_file();
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Ok((slf, state_file_status))
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}
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#[inline]
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pub fn current_exercise_ind(&self) -> usize {
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self.current_exercise_ind
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}
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#[inline]
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pub fn exercises(&self) -> &[Exercise] {
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&self.exercises
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}
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#[inline]
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pub fn n_done(&self) -> u16 {
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self.n_done
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}
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#[inline]
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pub fn current_exercise(&self) -> &Exercise {
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&self.exercises[self.current_exercise_ind]
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}
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#[inline]
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pub fn target_dir(&self) -> &Path {
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&self.target_dir
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}
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// Write the state file.
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// The file's format is very simple:
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// - The first line is a comment.
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// - The second line is an empty line.
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// - The third line is the name of the current exercise. It must end with `\n` even if there
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// are no done exercises.
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// - The fourth line is an empty line.
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// - All remaining lines are the names of done exercises.
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fn write(&mut self) -> Result<()> {
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self.file_buf.clear();
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self.file_buf
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.extend_from_slice(b"DON'T EDIT THIS FILE!\n\n");
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self.file_buf
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.extend_from_slice(self.current_exercise().name.as_bytes());
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self.file_buf.push(b'\n');
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for exercise in &self.exercises {
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if exercise.done {
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self.file_buf.push(b'\n');
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self.file_buf.extend_from_slice(exercise.name.as_bytes());
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}
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}
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fs::write(STATE_FILE_NAME, &self.file_buf)
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.with_context(|| format!("Failed to write the state file {STATE_FILE_NAME}"))?;
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Ok(())
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}
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pub fn set_current_exercise_ind(&mut self, exercise_ind: usize) -> Result<()> {
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if exercise_ind >= self.exercises.len() {
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bail!(BAD_INDEX_ERR);
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}
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self.current_exercise_ind = exercise_ind;
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self.write()
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}
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pub fn set_current_exercise_by_name(&mut self, name: &str) -> Result<()> {
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// O(N) is fine since this method is used only once until the program exits.
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// Building a hashmap would have more overhead.
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self.current_exercise_ind = self
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.exercises
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.iter()
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.position(|exercise| exercise.name == name)
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.with_context(|| format!("No exercise found for '{name}'!"))?;
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self.write()
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}
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pub fn set_pending(&mut self, exercise_ind: usize) -> Result<()> {
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let exercise = self
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.exercises
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.get_mut(exercise_ind)
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.context(BAD_INDEX_ERR)?;
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if exercise.done {
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exercise.done = false;
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self.n_done -= 1;
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self.write()?;
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}
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Ok(())
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}
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// Official exercises: Dump the original file from the binary.
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// Third-party exercises: Reset the exercise file with `git stash`.
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fn reset(&self, exercise_ind: usize, path: &str) -> Result<()> {
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if self.official_exercises {
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return EMBEDDED_FILES
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.write_exercise_to_disk(exercise_ind, path)
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.with_context(|| format!("Failed to reset the exercise {path}"));
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}
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let output = Command::new("git")
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.arg("stash")
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.arg("push")
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.arg("--")
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.arg(path)
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.stdin(Stdio::null())
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.stdout(Stdio::null())
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.output()
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.with_context(|| format!("Failed to run `git stash push -- {path}`"))?;
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if !output.status.success() {
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bail!(
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"`git stash push -- {path}` didn't run successfully: {}",
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String::from_utf8_lossy(&output.stderr),
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);
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}
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Ok(())
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}
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pub fn reset_current_exercise(&mut self) -> Result<&'static str> {
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self.set_pending(self.current_exercise_ind)?;
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let exercise = self.current_exercise();
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self.reset(self.current_exercise_ind, exercise.path)?;
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Ok(exercise.path)
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}
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pub fn reset_exercise_by_ind(&mut self, exercise_ind: usize) -> Result<&'static str> {
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if exercise_ind >= self.exercises.len() {
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bail!(BAD_INDEX_ERR);
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}
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self.set_pending(exercise_ind)?;
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let exercise = &self.exercises[exercise_ind];
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self.reset(exercise_ind, exercise.path)?;
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Ok(exercise.path)
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}
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// Return the index of the next pending exercise or `None` if all exercises are done.
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fn next_pending_exercise_ind(&self) -> Option<usize> {
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if self.current_exercise_ind == self.exercises.len() - 1 {
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// The last exercise is done.
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// Search for exercises not done from the start.
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return self.exercises[..self.current_exercise_ind]
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.iter()
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.position(|exercise| !exercise.done);
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}
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// The done exercise isn't the last one.
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// Search for a pending exercise after the current one and then from the start.
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match self.exercises[self.current_exercise_ind + 1..]
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.iter()
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.position(|exercise| !exercise.done)
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{
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Some(ind) => Some(self.current_exercise_ind + 1 + ind),
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None => self.exercises[..self.current_exercise_ind]
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.iter()
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.position(|exercise| !exercise.done),
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}
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}
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// Official exercises: Dump the solution file form the binary and return its path.
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// Third-party exercises: Check if a solution file exists and return its path in that case.
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pub fn current_solution_path(&self) -> Result<Option<String>> {
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if DEBUG_PROFILE {
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return Ok(None);
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}
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let current_exercise = self.current_exercise();
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if self.official_exercises {
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EMBEDDED_FILES
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.write_solution_to_disk(self.current_exercise_ind, current_exercise.name)
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.map(Some)
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} else {
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let solution_path = if let Some(dir) = current_exercise.dir {
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format!("solutions/{dir}/{}.rs", current_exercise.name)
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} else {
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format!("solutions/{}.rs", current_exercise.name)
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};
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if Path::new(&solution_path).exists() {
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return Ok(Some(solution_path));
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}
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Ok(None)
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}
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}
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// Mark the current exercise as done and move on to the next pending exercise if one exists.
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// If all exercises are marked as done, run all of them to make sure that they are actually
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// done. If an exercise which is marked as done fails, mark it as pending and continue on it.
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pub fn done_current_exercise(&mut self, writer: &mut StdoutLock) -> Result<ExercisesProgress> {
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let exercise = &mut self.exercises[self.current_exercise_ind];
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if !exercise.done {
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exercise.done = true;
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self.n_done += 1;
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}
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if let Some(ind) = self.next_pending_exercise_ind() {
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self.set_current_exercise_ind(ind)?;
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return Ok(ExercisesProgress::Pending);
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}
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writer.write_all(RERUNNING_ALL_EXERCISES_MSG)?;
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let mut output = Vec::with_capacity(OUTPUT_CAPACITY);
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for (exercise_ind, exercise) in self.exercises().iter().enumerate() {
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write!(writer, "Running {exercise} ... ")?;
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writer.flush()?;
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let success = exercise.run(&mut output, &self.target_dir)?;
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if !success {
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writeln!(writer, "{}\n", "FAILED".red())?;
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self.current_exercise_ind = exercise_ind;
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// No check if the exercise is done before setting it to pending
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// because no pending exercise was found.
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self.exercises[exercise_ind].done = false;
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self.n_done -= 1;
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self.write()?;
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return Ok(ExercisesProgress::Pending);
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}
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writeln!(writer, "{}", "ok".green())?;
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}
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clear_terminal(writer)?;
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writer.write_all(FENISH_LINE.as_bytes())?;
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let final_message = self.final_message.trim();
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if !final_message.is_empty() {
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writer.write_all(final_message.as_bytes())?;
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writer.write_all(b"\n")?;
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}
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Ok(ExercisesProgress::AllDone)
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}
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}
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const CARGO_METADATA_ERR: &str = "Failed to run the command `cargo metadata …`
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Did you already install Rust?
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Try running `cargo --version` to diagnose the problem.";
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const RERUNNING_ALL_EXERCISES_MSG: &[u8] = b"
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All exercises seem to be done.
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Recompiling and running all exercises to make sure that all of them are actually done.
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";
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const FENISH_LINE: &str = "+----------------------------------------------------+
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| You made it to the Fe-nish line! |
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+-------------------------- ------------------------+
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\\/\x1b[31m
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▒▒ ▒▒▒▒▒▒▒▒ ▒▒▒▒▒▒▒▒ ▒▒
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▒▒▒▒ ▒▒ ▒▒ ▒▒ ▒▒ ▒▒ ▒▒ ▒▒▒▒
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▒▒▒▒ ▒▒ ▒▒ ▒▒ ▒▒ ▒▒ ▒▒▒▒
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░░▒▒▒▒░░▒▒ ▒▒ ▒▒ ▒▒ ▒▒░░▒▒▒▒
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▓▓▓▓▓▓▓▓ ▓▓ ▓▓██ ▓▓ ▓▓██ ▓▓ ▓▓▓▓▓▓▓▓
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▒▒▒▒ ▒▒ ████ ▒▒ ████ ▒▒░░ ▒▒▒▒
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▒▒ ▒▒▒▒▒▒ ▒▒▒▒▒▒ ▒▒▒▒▒▒ ▒▒
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▒▒▒▒▒▒▒▒▒▒▓▓▓▓▓▓▒▒▒▒▒▒▒▒▓▓▓▓▓▓▒▒▒▒▒▒▒▒
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▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
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▒▒▒▒▒▒▒▒▒▒██▒▒▒▒▒▒██▒▒▒▒▒▒▒▒▒▒
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▒▒ ▒▒▒▒▒▒▒▒▒▒██████▒▒▒▒▒▒▒▒▒▒ ▒▒
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▒▒ ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒ ▒▒
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▒▒ ▒▒ ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒ ▒▒ ▒▒
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▒▒ ▒▒ ▒▒ ▒▒ ▒▒ ▒▒
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▒▒ ▒▒ ▒▒ ▒▒\x1b[0m
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";
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#[cfg(test)]
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mod tests {
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use super::*;
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fn dummy_exercise() -> Exercise {
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Exercise {
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dir: None,
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name: "0",
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path: "exercises/0.rs",
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test: false,
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strict_clippy: false,
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hint: String::new(),
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done: false,
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}
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}
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#[test]
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fn next_pending_exercise() {
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let mut app_state = AppState {
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current_exercise_ind: 0,
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exercises: vec![dummy_exercise(), dummy_exercise(), dummy_exercise()],
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n_done: 0,
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final_message: String::new(),
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file_buf: Vec::new(),
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official_exercises: true,
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target_dir: PathBuf::new(),
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};
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let mut assert = |done: [bool; 3], expected: [Option<usize>; 3]| {
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for (exercise, done) in app_state.exercises.iter_mut().zip(done) {
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exercise.done = done;
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}
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for (ind, expected) in expected.into_iter().enumerate() {
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app_state.current_exercise_ind = ind;
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assert_eq!(
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app_state.next_pending_exercise_ind(),
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expected,
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"done={done:?}, ind={ind}",
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);
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}
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};
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assert([true, true, true], [None, None, None]);
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assert([false, false, false], [Some(1), Some(2), Some(0)]);
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assert([false, true, true], [None, Some(0), Some(0)]);
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assert([true, false, true], [Some(1), None, Some(1)]);
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assert([true, true, false], [Some(2), Some(2), None]);
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assert([true, false, false], [Some(1), Some(2), Some(1)]);
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assert([false, true, false], [Some(2), Some(2), Some(0)]);
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assert([false, false, true], [Some(1), Some(0), Some(0)]);
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}
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}
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