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mo8it 2024-08-25 19:24:12 +02:00
parent fd2a8c01cb
commit 5f4875e2ba
2 changed files with 135 additions and 103 deletions
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8
src/list.rs
View file

@ -59,9 +59,7 @@ fn handle_list(app_state: &mut AppState, stdout: &mut StdoutLock) -> Result<()>
list_state.message.push_str(message);
}
KeyCode::Char('r') => {
list_state.reset_selected()?;
}
KeyCode::Char('r') => list_state.reset_selected()?,
KeyCode::Char('c') => {
if list_state.selected_to_current_exercise()? {
return Ok(());
@ -77,9 +75,7 @@ fn handle_list(app_state: &mut AppState, stdout: &mut StdoutLock) -> Result<()>
MouseEventKind::ScrollUp => list_state.select_previous(),
_ => continue,
},
Event::Resize(width, height) => {
list_state.set_term_size(width, height);
}
Event::Resize(width, height) => list_state.set_term_size(width, height),
// Ignore
Event::FocusGained | Event::FocusLost => continue,
}

224
src/list/state.rs
View file

@ -15,20 +15,21 @@ use crate::{app_state::AppState, exercise::Exercise, term::progress_bar, MAX_EXE
// +1 for padding.
const SPACE: &[u8] = &[b' '; MAX_EXERCISE_NAME_LEN + 1];
fn next_ln<const CLEAR_LAST_CHAR: bool>(stdout: &mut StdoutLock) -> io::Result<()> {
if CLEAR_LAST_CHAR {
// Avoids having the last written char as the last displayed one when
// the written width is higher than the terminal width.
// Happens on the Gnome terminal for example.
stdout.write_all(b" ")?;
}
fn next_ln(stdout: &mut StdoutLock) -> io::Result<()> {
stdout
.queue(Clear(ClearType::UntilNewLine))?
.queue(MoveToNextLine(1))?;
Ok(())
}
// Avoids having the last written char as the last displayed one when the
// written width is higher than the terminal width.
// Happens on the Gnome terminal for example.
fn next_ln_overwrite(stdout: &mut StdoutLock) -> io::Result<()> {
stdout.write_all(b" ")?;
next_ln(stdout)
}
#[derive(Copy, Clone, PartialEq, Eq)]
pub enum Filter {
Done,
@ -37,65 +38,111 @@ pub enum Filter {
}
pub struct ListState<'a> {
/// Footer message to be displayed if not empty.
pub message: String,
filter: Filter,
app_state: &'a mut AppState,
n_rows_with_filter: usize,
name_col_width: usize,
offset: usize,
selected: Option<usize>,
filter: Filter,
n_rows_with_filter: usize,
/// Selected row out of the displayed ones.
selected_row: Option<usize>,
term_width: u16,
term_height: u16,
separator: Vec<u8>,
separator_line: Vec<u8>,
narrow_term: bool,
show_footer: bool,
max_n_rows_to_display: usize,
scroll_padding: usize,
row_offset: usize,
}
impl<'a> ListState<'a> {
pub fn new(app_state: &'a mut AppState, stdout: &mut StdoutLock) -> io::Result<Self> {
let (term_width, term_height) = terminal::size()?;
stdout.queue(Clear(ClearType::All))?;
let name_col_title_len = 4;
let name_col_width = app_state
.exercises()
.iter()
.map(|exercise| exercise.name.len())
.max()
.map_or(4, |max| max.max(4));
.map_or(name_col_title_len, |max| max.max(name_col_title_len));
let filter = Filter::None;
let n_rows_with_filter = app_state.exercises().len();
let selected = app_state.current_exercise_ind();
let selected = Some(app_state.current_exercise_ind());
let mut slf = Self {
message: String::with_capacity(128),
filter: Filter::None,
app_state,
n_rows_with_filter,
name_col_width,
offset: selected.saturating_sub(10),
selected: Some(selected),
term_width,
term_height,
separator: "─".as_bytes().repeat(term_width as usize),
filter,
n_rows_with_filter,
selected_row: selected,
// Set by `set_term_size`
term_width: 0,
term_height: 0,
separator_line: Vec::new(),
narrow_term: false,
show_footer: true,
max_n_rows_to_display: 0,
scroll_padding: 0,
// Updated by `draw`
row_offset: 0,
};
let (width, height) = terminal::size()?;
slf.set_term_size(width, height);
slf.draw(stdout)?;
Ok(slf)
}
pub fn set_term_size(&mut self, width: u16, height: u16) {
self.term_width = width;
self.term_height = height;
self.separator_line = "─".as_bytes().repeat(width as usize);
self.narrow_term = width < 95 && self.selected_row.is_some();
self.show_footer = height > 6;
self.max_n_rows_to_display =
(height - 1 - u16::from(self.show_footer) * (4 + u16::from(self.narrow_term))) as usize;
self.scroll_padding = (self.max_n_rows_to_display / 4).min(5);
}
fn update_offset(&mut self) {
let Some(selected) = self.selected_row else {
return;
};
let min_offset = (selected + self.scroll_padding)
.saturating_sub(self.max_n_rows_to_display.saturating_sub(1));
let max_offset = selected.saturating_sub(self.scroll_padding);
let global_max_offset = self
.n_rows_with_filter
.saturating_sub(self.max_n_rows_to_display);
self.row_offset = self
.row_offset
.max(min_offset)
.min(max_offset)
.min(global_max_offset);
}
fn draw_rows(
&self,
stdout: &mut StdoutLock,
max_n_rows_to_display: usize,
filtered_exercises: impl Iterator<Item = (usize, &'a Exercise)>,
) -> io::Result<usize> {
let current_exercise_ind = self.app_state.current_exercise_ind();
let mut n_displayed_rows = 0;
for (exercise_ind, exercise) in filtered_exercises
.skip(self.offset)
.take(max_n_rows_to_display)
.skip(self.row_offset)
.take(self.max_n_rows_to_display)
{
if self.selected == Some(n_displayed_rows) {
if self.selected_row == Some(self.row_offset + n_displayed_rows) {
stdout.queue(SetBackgroundColor(Color::Rgb {
r: 50,
g: 50,
@ -128,7 +175,7 @@ impl<'a> ListState<'a> {
stdout.write_all(exercise.path.as_bytes())?;
next_ln::<true>(stdout)?;
next_ln_overwrite(stdout)?;
stdout.queue(ResetColor)?;
n_displayed_rows += 1;
}
@ -147,36 +194,27 @@ impl<'a> ListState<'a> {
stdout.write_all(b" Current State Name")?;
stdout.write_all(&SPACE[..self.name_col_width - 2])?;
stdout.write_all(b"Path")?;
next_ln::<true>(stdout)?;
next_ln_overwrite(stdout)?;
let narrow = self.term_width < 95;
let show_footer = self.term_height > 6;
let max_n_rows_to_display =
(self.term_height - 1 - u16::from(show_footer) * (4 + u16::from(narrow))) as usize;
self.update_offset();
// Rows
let iter = self.app_state.exercises().iter().enumerate();
let n_displayed_rows = match self.filter {
Filter::Done => self.draw_rows(
stdout,
max_n_rows_to_display,
iter.filter(|(_, exercise)| exercise.done),
)?,
Filter::Pending => self.draw_rows(
stdout,
max_n_rows_to_display,
iter.filter(|(_, exercise)| !exercise.done),
)?,
Filter::None => self.draw_rows(stdout, max_n_rows_to_display, iter)?,
Filter::Done => self.draw_rows(stdout, iter.filter(|(_, exercise)| exercise.done))?,
Filter::Pending => {
self.draw_rows(stdout, iter.filter(|(_, exercise)| !exercise.done))?
}
Filter::None => self.draw_rows(stdout, iter)?,
};
for _ in 0..max_n_rows_to_display - n_displayed_rows {
next_ln::<false>(stdout)?;
for _ in 0..self.max_n_rows_to_display - n_displayed_rows {
next_ln(stdout)?;
}
if show_footer {
stdout.write_all(&self.separator)?;
next_ln::<false>(stdout)?;
if self.show_footer {
stdout.write_all(&self.separator_line)?;
next_ln(stdout)?;
progress_bar(
stdout,
@ -184,21 +222,25 @@ impl<'a> ListState<'a> {
self.app_state.exercises().len() as u16,
self.term_width,
)?;
next_ln::<false>(stdout)?;
next_ln(stdout)?;
stdout.write_all(&self.separator)?;
next_ln::<false>(stdout)?;
stdout.write_all(&self.separator_line)?;
next_ln(stdout)?;
if self.message.is_empty() {
// Help footer
if self.selected_row.is_some() {
stdout.write_all(
"↓/j ↑/k home/g end/G │ <c>ontinue at │ <r>eset exercise │".as_bytes(),
"↓/j ↑/k home/g end/G | <c>ontinue at | <r>eset exercise".as_bytes(),
)?;
if narrow {
next_ln::<true>(stdout)?;
if self.narrow_term {
next_ln_overwrite(stdout)?;
stdout.write_all(b"filter ")?;
} else {
stdout.write_all(b" filter ")?;
stdout.write_all(b" | filter ")?;
}
} else {
stdout.write_all(b"filter ")?;
}
match self.filter {
@ -220,19 +262,19 @@ impl<'a> ListState<'a> {
}
Filter::None => stdout.write_all(b"<d>one/<p>ending")?,
}
stdout.write_all(" │ <q>uit list".as_bytes())?;
if narrow {
next_ln::<true>(stdout)?;
stdout.write_all(b" | <q>uit list")?;
if self.narrow_term {
next_ln_overwrite(stdout)?;
} else {
next_ln::<false>(stdout)?;
next_ln(stdout)?;
}
} else {
stdout.queue(SetForegroundColor(Color::Magenta))?;
stdout.write_all(self.message.as_bytes())?;
stdout.queue(ResetColor)?;
next_ln::<true>(stdout)?;
if narrow {
next_ln::<false>(stdout)?;
next_ln_overwrite(stdout)?;
if self.narrow_term {
next_ln(stdout)?;
}
}
}
@ -240,20 +282,8 @@ impl<'a> ListState<'a> {
stdout.queue(EndSynchronizedUpdate)?.flush()
}
pub fn set_term_size(&mut self, width: u16, height: u16) {
self.term_width = width;
self.term_height = height;
self.separator = "─".as_bytes().repeat(width as usize);
}
#[inline]
pub fn filter(&self) -> Filter {
self.filter
}
pub fn set_filter(&mut self, filter: Filter) {
self.filter = filter;
self.n_rows_with_filter = match filter {
fn update_rows(&mut self) {
self.n_rows_with_filter = match self.filter {
Filter::Done => self
.app_state
.exercises()
@ -270,42 +300,46 @@ impl<'a> ListState<'a> {
};
if self.n_rows_with_filter == 0 {
self.selected = None;
self.selected_row = None;
} else {
self.selected = Some(
self.selected
self.selected_row = Some(
self.selected_row
.map_or(0, |selected| selected.min(self.n_rows_with_filter - 1)),
);
}
}
#[inline]
pub fn filter(&self) -> Filter {
self.filter
}
pub fn set_filter(&mut self, filter: Filter) {
self.filter = filter;
self.update_rows();
}
pub fn select_next(&mut self) {
if self.n_rows_with_filter > 0 {
let next = self.selected.map_or(0, |selected| {
(selected + 1).min(self.n_rows_with_filter - 1)
});
self.selected = Some(next);
if let Some(selected) = self.selected_row {
self.selected_row = Some((selected + 1).min(self.n_rows_with_filter - 1));
}
}
pub fn select_previous(&mut self) {
if self.n_rows_with_filter > 0 {
let previous = self
.selected
.map_or(0, |selected| selected.saturating_sub(1));
self.selected = Some(previous);
if let Some(selected) = self.selected_row {
self.selected_row = Some(selected.saturating_sub(1));
}
}
pub fn select_first(&mut self) {
if self.n_rows_with_filter > 0 {
self.selected = Some(0);
self.selected_row = Some(0);
}
}
pub fn select_last(&mut self) {
if self.n_rows_with_filter > 0 {
self.selected = Some(self.n_rows_with_filter - 1);
self.selected_row = Some(self.n_rows_with_filter - 1);
}
}
@ -334,13 +368,14 @@ impl<'a> ListState<'a> {
}
pub fn reset_selected(&mut self) -> Result<()> {
let Some(selected) = self.selected else {
let Some(selected) = self.selected_row else {
self.message.push_str("Nothing selected to reset!");
return Ok(());
};
let exercise_ind = self.selected_to_exercise_ind(selected)?;
let exercise_path = self.app_state.reset_exercise_by_ind(exercise_ind)?;
self.update_rows();
write!(self.message, "The exercise {exercise_path} has been reset")?;
Ok(())
@ -348,13 +383,14 @@ impl<'a> ListState<'a> {
// Return `true` if there was something to select.
pub fn selected_to_current_exercise(&mut self) -> Result<bool> {
let Some(selected) = self.selected else {
let Some(selected) = self.selected_row else {
self.message.push_str("Nothing selected to continue at!");
return Ok(false);
};
let exercise_ind = self.selected_to_exercise_ind(selected)?;
self.app_state.set_current_exercise_ind(exercise_ind)?;
Ok(true)
}
}