trunk 0.7.1

Build, bundle & ship your Rust WASM application to the web.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84

//! Sass/Scss asset pipeline.

use std::path::PathBuf;
use std::sync::Arc;

use anyhow::{anyhow, Context, Result};
use async_std::fs;
use async_std::task::{spawn, spawn_blocking, JoinHandle};
use indicatif::ProgressBar;
use nipper::{Document, Selection};

use super::ATTR_HREF;
use super::{AssetFile, HashedFileOutput, TrunkLinkPipelineOutput};
use crate::config::RtcBuild;

/// A sass/scss asset pipeline.
pub struct Sass {
    /// The ID of this pipeline's source HTML element.
    id: usize,
    /// Runtime build config.
    cfg: Arc<RtcBuild>,
    /// The progress bar to use for this pipeline.
    progress: ProgressBar,
    /// The asset file being processed.
    asset: AssetFile,
}

impl Sass {
    pub const TYPE_SASS: &'static str = "sass";
    pub const TYPE_SCSS: &'static str = "scss";

    pub async fn new(cfg: Arc<RtcBuild>, progress: ProgressBar, html_dir: Arc<PathBuf>, el: Selection<'_>, id: usize) -> Result<Self> {
        // Build the path to the target asset.
        let href_attr = el
            .attr(ATTR_HREF)
            .ok_or_else(|| anyhow!("required attr `href` missing for <link data-trunk .../> element: {}", el.html()))?;
        let mut path = PathBuf::new();
        path.extend(href_attr.as_ref().split('/'));
        let asset = AssetFile::new(&html_dir, path).await?;
        Ok(Self { id, cfg, progress, asset })
    }

    /// Spawn the pipeline for this asset type.
    pub fn spawn(self) -> JoinHandle<Result<TrunkLinkPipelineOutput>> {
        spawn(async move {
            // Compile the target SASS/SCSS file.
            let path_str = self.asset.path.to_string_lossy().to_string();
            let mut opts = sass_rs::Options::default();
            if self.cfg.release {
                opts.output_style = sass_rs::OutputStyle::Compressed;
            }
            let css = spawn_blocking(move || sass_rs::compile_file(&path_str, opts)).await.map_err(|err| {
                self.progress.println(err);
                anyhow!("error compiling sass for {:?}", &self.asset.path)
            })?;

            // Hash the contents to generate a file name, and then write the contents to the dist dir.
            let hash = seahash::hash(css.as_bytes());
            let file_name = format!("{}-{:x}.css", &self.asset.file_stem.to_string_lossy(), hash);
            let file_path = self.cfg.dist.join(&file_name);
            fs::write(&file_path, css).await.context("error writing SASS pipeline output")?;
            Ok(TrunkLinkPipelineOutput::Sass(SassOutput {
                id: self.id,
                file: HashedFileOutput { hash, file_path, file_name },
            }))
        })
    }
}

/// The output of a sass/scss build pipeline.
pub struct SassOutput {
    /// The ID of this pipeline.
    pub id: usize,
    /// Data on the finalized output file.
    pub file: HashedFileOutput,
}

impl SassOutput {
    pub async fn finalize(self, dom: &mut Document) -> Result<()> {
        dom.select(&super::trunk_id_selector(self.id))
            .replace_with_html(format!(r#"<link rel="stylesheet" href="{}"/>"#, self.file.file_name));
        Ok(())
    }
}