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use {
crate::{
display::{CropWriter, SPACE_FILLING, Screen, W},
errors::ProgramError,
skin::PanelSkin,
},
char_reader::CharReader,
crossterm::{
cursor,
QueueableCommand,
},
std::{
fs::File,
path::PathBuf,
},
termimad::{Area},
};
/// a (light) display for a file declaring a size 0,
/// as happens for many system "files", for example in /proc
pub struct ZeroLenFileView {
path: PathBuf,
}
impl ZeroLenFileView {
pub fn new(path: PathBuf) -> Self {
Self {
path,
}
}
pub fn display(
&mut self,
w: &mut W,
_screen: Screen,
panel_skin: &PanelSkin,
area: &Area,
) -> Result<(), ProgramError> {
let styles = &panel_skin.styles;
let line_count = area.height as usize;
let file = File::open(&self.path)?;
let mut reader = CharReader::new(file);
// line_len here is in chars, and we crop in cols, but it's OK because both
// are usually identical for system files and we crop later anyway
let line_len = area.width as usize;
for y in 0..line_count {
w.queue(cursor::MoveTo(area.left, y as u16 + area.top))?;
let mut cw = CropWriter::new(w, area.width as usize);
let cw = &mut cw;
if let Some(line) = reader.next_line(line_len, 15_000)? {
cw.queue_str(&styles.default, &line)?;
}
cw.fill(&styles.default, &SPACE_FILLING)?;
}
Ok(())
}
}
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