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use std::path;
use std::process::{Command, Output};
use std::thread;
use std::time;
use ratatui::layout::Rect;
use crate::context::AppContext;
use crate::event::AppEvent;
use crate::ui::{views, AppBackend};
pub enum PreviewFileState {
Loading,
Error { message: String },
Success { data: FilePreview },
}
#[derive(Clone, Debug)]
pub struct FilePreview {
pub status: std::process::ExitStatus,
pub output: String,
pub index: usize,
pub modified: time::SystemTime,
}
impl std::convert::From<Output> for FilePreview {
fn from(output: Output) -> Self {
let s = String::from_utf8_lossy(&output.stdout).to_string();
let s2 = s.replace('\t', " ");
let status = output.status;
let modified = time::SystemTime::now();
Self {
status,
output: s2,
modified,
index: 0,
}
}
}
pub struct Background {}
impl Background {
pub fn preview_path_with_script(
context: &mut AppContext,
backend: &mut AppBackend,
path: path::PathBuf,
) {
let preview_options = context.config_ref().preview_options_ref();
if let Some(script) = preview_options.preview_script.as_ref() {
if let Ok(area) = backend.terminal_ref().size() {
let area = Rect {
y: area.top() + 1,
height: area.height - 2,
..area
};
let config = context.config_ref();
let display_options = config.display_options_ref();
let constraints = &display_options.default_layout;
let layout = if display_options.show_borders() {
views::calculate_layout_with_borders(area, constraints)
} else {
views::calculate_layout(area, constraints)
};
let layout_rect = layout[2];
let preview_width = layout_rect.width;
let preview_height = layout_rect.height;
if preview_width == 0 || preview_height == 0 {
return;
}
let script = script.clone();
let event_tx = context.clone_event_tx();
context
.preview_context_mut()
.previews_mut()
.insert(path.clone(), PreviewFileState::Loading);
let _ = thread::spawn(move || {
let file_full_path = path.as_path();
let res = Command::new(script)
.arg("--path")
.arg(file_full_path)
.arg("--preview-width")
.arg(preview_width.to_string())
.arg("--preview-height")
.arg(preview_height.to_string())
.output();
match res {
Ok(output) => {
let preview = FilePreview::from(output);
let res = AppEvent::PreviewFile {
path,
res: Box::new(Ok(preview)),
};
let _ = event_tx.send(res);
}
Err(e) => {
let res = AppEvent::PreviewFile {
path,
res: Box::new(Err(e)),
};
let _ = event_tx.send(res);
}
}
});
}
}
}
}
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