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use std::collections::HashMap;
use std::error::Error;
use std::path::{self, PathBuf};
use std::process::{Command, Stdio};
use std::sync::mpsc::{self, Sender};
use std::sync::Mutex;
use std::{io, thread};
use ratatui::layout::Rect;
use ratatui_image::picker::Picker;
use ratatui_image::protocol::Protocol;
use ratatui_image::Resize;
use crate::config::clean::app::AppConfig;
use crate::event::{AppEvent, PreviewData};
use crate::lazy_static;
use crate::preview::preview_file::{FilePreview, PreviewFileState};
use crate::ui::{views, AppBackend};
use crate::AppContext;
lazy_static! {
static ref GUARD: Mutex<()> = Mutex::new(());
}
type FilePreviewMetadata = HashMap<path::PathBuf, PreviewFileState>;
pub struct PreviewContext {
previews: FilePreviewMetadata,
image_preview: Option<(PathBuf, Box<dyn Protocol>)>,
sender_script: Sender<(PathBuf, Rect)>,
sender_image: Option<Sender<(PathBuf, Rect)>>,
event_ts: Sender<AppEvent>,
}
impl PreviewContext {
pub fn new(
picker: Option<Picker>,
script: Option<PathBuf>,
event_ts: Sender<AppEvent>,
) -> PreviewContext {
let (sender_script, receiver) = mpsc::channel::<(PathBuf, Rect)>();
let thread_script_event_ts = event_ts.clone();
thread::spawn(move || {
for (path, rect) in receiver {
if let Some(ref script) = script {
PreviewContext::spawn_command(
path.clone(),
script.to_path_buf(),
rect,
thread_script_event_ts.clone(),
);
}
}
});
let (sender_image, receiver) = mpsc::channel::<(PathBuf, Rect)>();
let sender_image = picker.map(|mut picker| {
let thread_image_event_ts = event_ts.clone();
thread::spawn(move || loop {
// Get last, or block for next.
if let Some((path, rect)) = receiver
.try_iter()
.last()
.or_else(|| receiver.iter().next())
{
let proto = image::io::Reader::open(path.as_path())
.and_then(|reader| reader.decode().map_err(Self::map_io_err))
.and_then(|dyn_img| {
picker
.new_protocol(dyn_img, rect, Resize::Fit)
.map_err(|err| {
io::Error::new(io::ErrorKind::Other, format!("{err}"))
})
});
if let Ok(proto) = proto {
let ev = AppEvent::PreviewFile {
path,
res: Ok(PreviewData::Image(proto)),
};
let _ = thread_image_event_ts.send(ev);
}
} else {
// Closed.
return;
}
});
sender_image
});
PreviewContext {
previews: HashMap::new(),
image_preview: None,
sender_script,
sender_image,
event_ts,
}
}
fn spawn_command(
path: PathBuf,
script: PathBuf,
rect: Rect,
thread_event_ts: Sender<AppEvent>,
) {
let output = Command::new(script)
.stdout(Stdio::piped())
.stderr(Stdio::null())
.arg("--path")
.arg(path.as_path())
.arg("--preview-width")
.arg(rect.width.to_string())
.arg("--preview-height")
.arg(rect.height.to_string())
.output();
let res = match output {
Ok(output) => {
if output.status.success() {
let preview = FilePreview::from(output);
AppEvent::PreviewFile {
path,
res: Ok(PreviewData::Script(Box::new(preview))),
}
} else {
AppEvent::PreviewFile {
path,
res: Err(io::Error::new(io::ErrorKind::Other, "nonzero status")),
}
}
}
Err(err) => AppEvent::PreviewFile {
path,
res: Err(io::Error::new(io::ErrorKind::Other, format!("{err}"))),
},
};
let _ = thread_event_ts.send(res);
}
pub fn previews_ref(&self) -> &FilePreviewMetadata {
&self.previews
}
pub fn previews_mut(&mut self) -> &mut FilePreviewMetadata {
&mut self.previews
}
pub fn image_preview_ref(&self, other: &path::Path) -> Option<&dyn Protocol> {
match &self.image_preview {
Some((path, protocol)) if path == other => Some(protocol.as_ref()),
_ => None,
}
}
pub fn set_image_preview(&mut self, preview: Option<(path::PathBuf, Box<dyn Protocol>)>) {
self.image_preview = preview;
}
pub fn load_preview_script(
&self,
context: &AppContext,
backend: &AppBackend,
path: path::PathBuf,
) {
if let Err(err) = Self::backend_rect(context.config_ref(), backend).and_then(|rect| {
self.sender_script
.send((path.clone(), rect))
.map_err(Self::map_io_err)
}) {
let ev = AppEvent::PreviewFile {
path,
res: Err(err),
};
let _ = self.event_ts.send(ev);
}
}
pub fn load_preview_image(
&self,
context: &AppContext,
backend: &AppBackend,
path: path::PathBuf,
) {
if let Some(sender) = &self.sender_image {
if let Err(err) = Self::backend_rect(context.config_ref(), backend)
.and_then(|rect| sender.send((path.clone(), rect)).map_err(Self::map_io_err))
{
let ev = AppEvent::PreviewFile {
path,
res: Err(err),
};
let _ = self.event_ts.send(ev);
}
}
}
fn backend_rect(config: &AppConfig, backend: &AppBackend) -> io::Result<Rect> {
let area = backend.terminal_ref().size()?;
let area = Rect {
y: area.top() + 1,
height: area.height - 2,
..area
};
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)
};
Ok(layout[2])
}
#[inline]
fn map_io_err(err: impl Error) -> io::Error {
io::Error::new(io::ErrorKind::Other, format!("{err}"))
}
}
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