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use std::{
fs,
io::{self, ErrorKind},
path::{Path, PathBuf},
};
use clap::Parser;
use color_eyre::eyre::{bail, eyre, Context, Result};
use hittekaart::{
gpx::{self, Compression},
renderer,
};
use indicatif::{MultiProgress, ProgressBar, ProgressDrawTarget, ProgressStyle};
use is_terminal::IsTerminal;
use rayon::ThreadPoolBuilder;
#[derive(Parser, Debug, Clone)]
#[command(author, version, about)]
struct Args {
/// The GPX files to parse.
#[arg(required = true)]
files: Vec<PathBuf>,
/// Minimum zoom level to generate tiles for.
#[arg(long, default_value_t = 0)]
min_zoom: u32,
/// Maximum zoom level to generate tiles for.
#[arg(long, default_value_t = 19)]
max_zoom: u32,
/// Number of threads to use. Set to 0 to use all available CPU cores.
#[arg(long, short, default_value_t = 0)]
threads: usize,
/// The output directory. Will be created if it does not exist.
#[arg(long, short, default_value = "tiles")]
output_directory: PathBuf,
}
fn main() -> Result<()> {
color_eyre::install()?;
let args = Args::parse();
if args.max_zoom < args.min_zoom {
bail!("Max zoom cannot be smaller than min zoom!");
}
ThreadPoolBuilder::new()
.num_threads(args.threads)
.build_global()?;
let progress_style =
ProgressStyle::with_template("[{elapsed}] {prefix:.cyan} {wide_bar} {pos:.green}/{len}")?;
let zoom_style =
ProgressStyle::with_template("[{elapsed}] {prefix:.yellow} {wide_bar} {pos:.green}/{len}")?;
let use_progress_bars = io::stdout().is_terminal();
let make_bar = |len| {
if use_progress_bars {
ProgressBar::new(len)
} else {
ProgressBar::hidden()
}
};
let bar = make_bar(args.files.len().try_into().unwrap()).with_style(progress_style.clone());
bar.set_prefix("Reading GPX files");
let mut tracks = Vec::new();
for file in &args.files {
let compression = Compression::suggest_from_path(file)
.ok_or_else(|| eyre!("Could not determine format for {file:?}"))?;
let data = gpx::extract_from_file(file, compression)?;
tracks.push(data);
bar.inc(1);
}
bar.finish();
ensure_output_directory(&args.output_directory)?;
let multibar = MultiProgress::new();
if !use_progress_bars {
multibar.set_draw_target(ProgressDrawTarget::hidden())
}
let zoom_bar = make_bar((args.max_zoom - args.min_zoom + 1).into()).with_style(zoom_style);
multibar.add(zoom_bar.clone());
zoom_bar.set_prefix("Zoom levels");
for zoom in args.min_zoom..=args.max_zoom {
let bar = make_bar(tracks.len().try_into().unwrap()).with_style(progress_style.clone());
multibar.insert_from_back(1, bar.clone());
bar.set_prefix("Rendering heat zones");
let counter =
renderer::render_heatcounter(zoom, &tracks, |x| bar.inc(x.try_into().unwrap()));
bar.finish();
multibar.remove(&bar);
let target = [&args.output_directory, &zoom.to_string().into()]
.iter()
.collect::<PathBuf>();
fs::create_dir(&target)?;
let bar =
make_bar(counter.tile_count().try_into().unwrap()).with_style(progress_style.clone());
multibar.insert_from_back(1, bar.clone());
bar.set_prefix("Saving heat tiles");
renderer::lazy_colorization(counter, &target, |x| bar.inc(x.try_into().unwrap()))?;
bar.finish();
multibar.remove(&bar);
zoom_bar.inc(1);
}
zoom_bar.finish();
Ok(())
}
fn ensure_output_directory<P: AsRef<Path>>(path: P) -> Result<()> {
let path = path.as_ref();
let metadata = fs::metadata(path);
match metadata {
Err(e) if e.kind() == ErrorKind::NotFound => {
let parent = path.parent().unwrap_or_else(|| Path::new("/"));
fs::create_dir(path)
.context(format!("Could not create output directory at {parent:?}"))?
}
Err(e) => Err(e).context("Error while checking output directory")?,
Ok(m) if m.is_dir() => (),
Ok(_) => bail!("Output directory is not a directory"),
}
Ok(())
}
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