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use crate::shell::prelude::*;
mod entry;
pub use entry::{Entry, ExitInfo};
mod pty;
pub struct History {
size: (u16, u16),
entries: Vec<Entry>,
scroll_pos: usize,
}
impl History {
pub fn new() -> Self {
Self {
size: (24, 80),
entries: vec![],
scroll_pos: 0,
}
}
pub fn render(
&self,
out: &mut impl textmode::Textmode,
repl_lines: usize,
focus: Option<usize>,
scrolling: bool,
offset: time::UtcOffset,
) {
let mut cursor = None;
for (idx, used_lines, mut vt) in
self.visible(repl_lines, focus, scrolling).rev()
{
let focused = focus.map_or(false, |focus| idx == focus);
out.move_to(
(usize::from(self.size.0) - used_lines).try_into().unwrap(),
0,
);
self.entries[idx].render(
out,
self.entry_count(),
&mut *vt,
focused,
scrolling,
offset,
);
if focused && !scrolling {
cursor = Some((
out.screen().cursor_position(),
out.screen().hide_cursor(),
));
}
}
if let Some((pos, hide)) = cursor {
out.move_to(pos.0, pos.1);
out.hide_cursor(hide);
}
}
pub fn entry(&self, idx: usize) -> &Entry {
&self.entries[idx]
}
pub fn entry_mut(&mut self, idx: usize) -> &mut Entry {
&mut self.entries[idx]
}
pub fn resize(&mut self, size: (u16, u16)) {
self.size = size;
for entry in &self.entries {
entry.resize(size);
}
}
pub fn run(
&mut self,
cmdline: String,
env: Env,
event_w: crate::shell::event::Writer,
) {
self.entries
.push(Entry::new(cmdline, env, self.size, event_w).unwrap());
}
pub fn entry_count(&self) -> usize {
self.entries.len()
}
pub fn make_focus_visible(
&mut self,
repl_lines: usize,
focus: Option<usize>,
scrolling: bool,
) {
if self.entries.is_empty() || focus.is_none() {
return;
}
let focus = focus.unwrap();
let mut done = false;
while focus
< self
.visible(repl_lines, Some(focus), scrolling)
.map(|(idx, ..)| idx)
.next()
.unwrap()
{
self.scroll_pos += 1;
done = true;
}
if done {
return;
}
while focus
> self
.visible(repl_lines, Some(focus), scrolling)
.map(|(idx, ..)| idx)
.last()
.unwrap()
{
self.scroll_pos -= 1;
}
}
pub async fn save(&self) {
// TODO: we'll probably want some amount of flock or something here
let mut fh = tokio::fs::OpenOptions::new()
.append(true)
.open(crate::dirs::history_file())
.await
.unwrap();
for entry in &self.entries {
fh.write_all(
format!(
": {}:0;{}\n",
entry.start_time().unix_timestamp(),
entry.cmd()
)
.as_bytes(),
)
.await
.unwrap();
}
}
fn visible(
&self,
repl_lines: usize,
focus: Option<usize>,
scrolling: bool,
) -> VisibleEntries {
let mut iter = VisibleEntries::new();
let mut used_lines = repl_lines;
for (idx, entry) in
self.entries.iter().enumerate().rev().skip(self.scroll_pos)
{
let focused = focus.map_or(false, |focus| idx == focus);
used_lines +=
entry.lines(self.entry_count(), focused && !scrolling);
if used_lines > usize::from(self.size.0) {
break;
}
iter.add(idx, used_lines, entry.lock_vt());
}
iter
}
}
struct VisibleEntries<'a> {
entries: std::collections::VecDeque<(
usize,
usize,
std::sync::MutexGuard<'a, pty::Vt>,
)>,
}
impl<'a> VisibleEntries<'a> {
fn new() -> Self {
Self {
entries: std::collections::VecDeque::new(),
}
}
fn add(
&mut self,
idx: usize,
offset: usize,
vt: std::sync::MutexGuard<'a, pty::Vt>,
) {
// push_front because we are adding them in reverse order
self.entries.push_front((idx, offset, vt));
}
}
impl<'a> std::iter::Iterator for VisibleEntries<'a> {
type Item = (usize, usize, std::sync::MutexGuard<'a, pty::Vt>);
fn next(&mut self) -> Option<Self::Item> {
self.entries.pop_front()
}
}
impl<'a> std::iter::DoubleEndedIterator for VisibleEntries<'a> {
fn next_back(&mut self) -> Option<Self::Item> {
self.entries.pop_back()
}
}
|
