ssg 0.0.46

A secure-by-default static site generator built in Rust. WCAG 2.2 AA validation, CSP/SRI hardening, native JS/CSS minification, automated CycloneDX SBOM, local LLM content pipeline, WebAssembly target, interactive islands, streaming compilation for 100K+ pages, 28-locale i18n, and one-command deployment.
Documentation 
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// Copyright © 2023 - 2026 Static Site Generator (SSG). All rights reserved.
// SPDX-License-Identifier: Apache-2.0 OR MIT

//! Vector-search artifact emitter (issue #545).
//!
//! Walks the compiled site for HTML files, runs the `ssg-search`
//! encoder over each page's visible text, and writes the four-file
//! WASM-loadable bundle to `<site>/search/`:
//!
//!   - `embeddings.bin`  — pre-normalised f32 vectors, little-endian.
//!   - `manifest.json`   — row index → `{url, title, excerpt}` map.
//!   - `model.bin`       — encoder weights / config (with magic header).
//!   - `tokenizer.bin`   — tokeniser config (with magic header).
//!
//! Intended to run **alongside** [`crate::search::SearchPlugin`]
//! (which is a separate keystroke-based lexical search). The two
//! coexist — `search-index.json` powers the modal autocomplete,
//! `search/embeddings.bin` powers the semantic ranked results
//! returned by the WASM engine.
//!
//! ## Why a separate plugin
//!
//! The vector bundle is large (one f32 per dim per doc) so it ships
//! to the browser separately and lazily — never inlined into HTML —
//! and the worker fetches it the first time the user types. The
//! existing `SearchPlugin` is on every page; this plugin is opt-in
//! via [`crate::plugin::PluginManager::register`].

use crate::error::{PathErrorExt, SsgError};
use crate::plugin::{Plugin, PluginContext};
use crate::search::SearchIndex;
use ssg_search::{
    paths::{EMBEDDINGS_FILE, MANIFEST_FILE, MODEL_FILE, TOKENIZER_FILE},
    ArtifactsBuilder,
};
use std::fs;

/// Short excerpt length in characters — fits a single search-result
/// snippet line in typical layouts.
const EXCERPT_CHARS: usize = 160;

/// Plugin that builds the `<site>/search/` vector bundle.
///
/// # Examples
///
/// ```
/// use ssg::plugin::Plugin;
/// use ssg::search_index::VectorSearchPlugin;
/// assert_eq!(VectorSearchPlugin.name(), "vector-search");
/// ```
#[derive(Debug, Clone, Copy, Default)]
pub struct VectorSearchPlugin;

impl Plugin for VectorSearchPlugin {
    fn name(&self) -> &'static str {
        "vector-search"
    }

    fn after_compile(&self, ctx: &PluginContext) -> Result<(), SsgError> {
        if !ctx.site_dir.exists() {
            return Ok(());
        }
        if ctx.dry_run {
            return Ok(());
        }

        // Re-use SearchIndex's HTML-walking logic so we get title +
        // body text via lol_html (same filters that exclude
        // <script>/<style>/<nav>/<footer>/<head>).
        let index = SearchIndex::build(&ctx.site_dir)?;
        if index.is_empty() {
            return Ok(());
        }

        let mut builder = ArtifactsBuilder::default();
        for e in &index.entries {
            let excerpt = truncate_chars(&e.content, EXCERPT_CHARS);
            let _ = builder.add_doc(ssg_search::artifacts::InputDoc {
                url: e.url.clone(),
                title: e.title.clone(),
                body: format!("{}\n{}", e.title, e.content),
                excerpt,
            });
        }

        let artifacts = builder.build();

        // Materialise the four files under <site>/search/.
        let dir = ctx.site_dir.join("search");
        fs::create_dir_all(&dir).with_path(&dir)?;

        let emb_path = dir.join(EMBEDDINGS_FILE);
        fs::write(&emb_path, &artifacts.embeddings).with_path(&emb_path)?;

        let man_path = dir.join(MANIFEST_FILE);
        fs::write(&man_path, &artifacts.manifest_json).with_path(&man_path)?;

        let model_path = dir.join(MODEL_FILE);
        fs::write(&model_path, &artifacts.model).with_path(&model_path)?;

        let tok_path = dir.join(TOKENIZER_FILE);
        fs::write(&tok_path, &artifacts.tokenizer).with_path(&tok_path)?;

        log::info!(
            "[vector-search] Wrote {} docs ({} bytes embeddings) to {}",
            artifacts.count(),
            artifacts.embeddings.len(),
            dir.display()
        );
        Ok(())
    }
}

/// Returns the first `max_chars` Unicode scalar values of `s`. (Plain
/// `s[..max]` slicing on bytes would split multibyte sequences.)
fn truncate_chars(s: &str, max_chars: usize) -> String {
    if s.chars().count() <= max_chars {
        return s.to_string();
    }
    s.chars().take(max_chars).collect()
}

#[cfg(test)]
#[allow(clippy::unwrap_used, clippy::expect_used)]
mod tests {
    use super::*;
    use std::path::Path;
    use tempfile::tempdir;

    fn ctx(p: &Path) -> PluginContext {
        PluginContext::new(p, p, p, p)
    }

    fn write_html(dir: &Path, name: &str, body: &str) {
        let p = dir.join(name);
        fs::write(
            &p,
            format!(
                "<!DOCTYPE html><html><head><title>{name}</title></head><body>{body}</body></html>"
            ),
        )
        .unwrap();
    }

    #[test]
    fn plugin_name() {
        assert_eq!(VectorSearchPlugin.name(), "vector-search");
    }

    #[test]
    fn plugin_is_noop_on_missing_dir() {
        let tmp = tempdir().unwrap();
        let missing = tmp.path().join("not-here");
        let c = ctx(&missing);
        VectorSearchPlugin.after_compile(&c).unwrap();
        assert!(!missing.exists());
    }

    #[test]
    fn plugin_is_noop_in_dry_run() {
        let tmp = tempdir().unwrap();
        write_html(tmp.path(), "page.html", "<p>hello</p>");
        let c = ctx(tmp.path()).with_dry_run(true);
        VectorSearchPlugin.after_compile(&c).unwrap();
        assert!(!tmp.path().join("search").exists());
    }

    #[test]
    fn plugin_is_noop_on_empty_corpus() {
        let tmp = tempdir().unwrap();
        let c = ctx(tmp.path());
        VectorSearchPlugin.after_compile(&c).unwrap();
        // No HTML → SearchIndex empty → no search/ dir is created.
        assert!(!tmp.path().join("search").exists());
    }

    #[test]
    fn plugin_emits_four_artifacts() {
        let tmp = tempdir().unwrap();
        write_html(
            tmp.path(),
            "a.html",
            "<p>rust webassembly compiles to portable browser modules</p>",
        );
        write_html(
            tmp.path(),
            "b.html",
            "<p>baking sourdough bread starter flour</p>",
        );
        let c = ctx(tmp.path());
        VectorSearchPlugin.after_compile(&c).unwrap();

        let dir = tmp.path().join("search");
        assert!(dir.exists());
        assert!(dir.join("embeddings.bin").exists());
        assert!(dir.join("manifest.json").exists());
        assert!(dir.join("model.bin").exists());
        assert!(dir.join("tokenizer.bin").exists());
    }

    #[test]
    fn embeddings_size_is_n_x_d_x_4() {
        let tmp = tempdir().unwrap();
        write_html(tmp.path(), "a.html", "<p>foo bar baz</p>");
        write_html(tmp.path(), "b.html", "<p>quux corge grault</p>");
        let c = ctx(tmp.path());
        VectorSearchPlugin.after_compile(&c).unwrap();
        let emb = fs::read(tmp.path().join("search/embeddings.bin")).unwrap();
        assert_eq!(emb.len(), 2 * 256 * 4);
    }

    #[test]
    fn manifest_has_one_entry_per_html() {
        let tmp = tempdir().unwrap();
        write_html(tmp.path(), "x.html", "<p>alpha</p>");
        write_html(tmp.path(), "y.html", "<p>beta</p>");
        let c = ctx(tmp.path());
        VectorSearchPlugin.after_compile(&c).unwrap();
        let json = fs::read_to_string(tmp.path().join("search/manifest.json"))
            .unwrap();
        let m: serde_json::Value = serde_json::from_str(&json).unwrap();
        assert_eq!(m["count"].as_u64().unwrap(), 2);
        assert_eq!(m["entries"].as_array().unwrap().len(), 2);
    }

    #[test]
    fn truncate_chars_respects_unicode_boundaries() {
        let s = "résumé café";
        let t = truncate_chars(s, 6);
        // 6 chars: "résumé" (no panic on multi-byte char)
        assert_eq!(t, "résumé");
    }

    #[test]
    fn truncate_chars_returns_full_string_when_short() {
        let s = "short";
        assert_eq!(truncate_chars(s, 100), "short");
    }

    #[test]
    fn embeddings_byte_identical_across_runs() {
        let tmp = tempdir().unwrap();
        write_html(
            tmp.path(),
            "a.html",
            "<p>identical content produces identical embeddings</p>",
        );
        let c = ctx(tmp.path());
        VectorSearchPlugin.after_compile(&c).unwrap();
        let first = fs::read(tmp.path().join("search/embeddings.bin")).unwrap();
        // Rebuild
        VectorSearchPlugin.after_compile(&c).unwrap();
        let second =
            fs::read(tmp.path().join("search/embeddings.bin")).unwrap();
        assert_eq!(first, second);
    }
}