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|
use crate::shell::prelude::*;
use tokio::io::AsyncBufReadExt as _;
use pest::Parser as _;
#[derive(pest_derive::Parser)]
#[grammar = "history.pest"]
struct HistoryLine;
pub struct History {
entries: std::sync::Arc<std::sync::Mutex<Vec<Entry>>>,
}
impl History {
pub fn new() -> Self {
let entries = std::sync::Arc::new(std::sync::Mutex::new(vec![]));
tokio::spawn(Self::task(std::sync::Arc::clone(&entries)));
Self { entries }
}
pub fn entry_count(&self) -> usize {
self.entries.lock().unwrap().len()
}
async fn task(entries: std::sync::Arc<std::sync::Mutex<Vec<Entry>>>) {
// TODO: we should actually read this in reverse order, because we
// want to populate the most recent entries first
let mut stream = tokio_stream::wrappers::LinesStream::new(
tokio::io::BufReader::new(
tokio::fs::File::open(crate::dirs::history_file())
.await
.unwrap(),
)
.lines(),
);
while let Some(line) = stream.next().await {
let line = if let Ok(line) = line {
line
} else {
continue;
};
let entry = if let Ok(entry) = line.parse() {
entry
} else {
continue;
};
entries.lock().unwrap().push(entry);
}
}
}
pub struct Entry {
cmdline: String,
start_time: Option<time::OffsetDateTime>,
duration: Option<std::time::Duration>,
}
impl Entry {
pub fn render(
&self,
out: &mut impl textmode::Textmode,
offset: time::UtcOffset,
) {
let size = out.screen().size();
let mut time = "".to_string();
if let Some(duration) = self.duration {
time.push_str(&crate::format::duration(duration));
}
if let Some(start_time) = self.start_time {
time.push_str(&crate::format::time(start_time.to_offset(offset)));
}
out.write_str(" $ ");
let start = usize::from(out.screen().cursor_position().1);
let end = usize::from(size.1) - time.len() - 2;
let max_len = end - start;
let cmd = if self.cmdline.len() > max_len {
&self.cmdline[..(max_len - 4)]
} else {
&self.cmdline
};
out.write_str(cmd);
if self.cmdline.len() > max_len {
out.write_str(" ");
out.set_fgcolor(textmode::color::BLUE);
out.write_str("...");
}
out.reset_attributes();
out.set_bgcolor(textmode::Color::Rgb(0x20, 0x20, 0x20));
let cur_pos = out.screen().cursor_position();
out.write_str(&" ".repeat(
usize::from(size.1) - time.len() - 1 - usize::from(cur_pos.1),
));
out.write_str(&time);
out.write_str(" ");
out.reset_attributes();
}
pub fn cmd(&self) -> &str {
&self.cmdline
}
}
impl std::str::FromStr for Entry {
type Err = anyhow::Error;
fn from_str(line: &str) -> std::result::Result<Self, Self::Err> {
let mut parsed =
HistoryLine::parse(Rule::line, line).map_err(|e| anyhow!(e))?;
let line = parsed.next().unwrap();
assert!(matches!(line.as_rule(), Rule::line));
let mut start_time = None;
let mut duration = None;
let mut cmdline = None;
for part in line.into_inner() {
match part.as_rule() {
Rule::time => {
start_time =
Some(time::OffsetDateTime::from_unix_timestamp(
part.as_str().parse()?,
)?);
}
Rule::duration => {
if part.as_str() == "0" {
continue;
}
let mut dur_parts = part.as_str().split('.');
let secs: u64 = dur_parts.next().unwrap().parse()?;
let nsec_str = dur_parts.next().unwrap_or("0");
let nsec_str = &nsec_str[..9.min(nsec_str.len())];
let nsecs: u64 = nsec_str.parse()?;
duration = Some(std::time::Duration::from_nanos(
secs * 1_000_000_000
+ nsecs
* (10u64.pow(
(9 - nsec_str.len()).try_into().unwrap(),
)),
));
}
Rule::command => {
cmdline = Some(part.as_str().to_string());
}
Rule::line => unreachable!(),
Rule::EOI => break,
}
}
Ok(Self {
cmdline: cmdline.unwrap(),
start_time,
duration,
})
}
}
#[test]
fn test_parse() {
let entry: Entry =
": 1646779848:1234.56;vim ~/.zsh_history".parse().unwrap();
assert_eq!(entry.cmdline, "vim ~/.zsh_history");
assert_eq!(
entry.duration,
Some(std::time::Duration::from_nanos(1_234_560_000_000))
);
assert_eq!(
entry.start_time,
Some(time::macros::datetime!(2022-03-08 22:50:48).assume_utc())
);
let entry: Entry = ": 1646779848:1;vim ~/.zsh_history".parse().unwrap();
assert_eq!(entry.cmdline, "vim ~/.zsh_history");
assert_eq!(entry.duration, Some(std::time::Duration::from_secs(1)));
assert_eq!(
entry.start_time,
Some(time::macros::datetime!(2022-03-08 22:50:48).assume_utc())
);
let entry: Entry = "vim ~/.zsh_history".parse().unwrap();
assert_eq!(entry.cmdline, "vim ~/.zsh_history");
assert_eq!(entry.duration, None);
assert_eq!(entry.start_time, None);
}
|
