// workflow step: enrich — auto-generate an excerpt (if missing) and a reading
// time, and write them back onto the post. Runs in PARALLEL with `seo`.
let b = ctx.request.body;
let posts = docs::collection("posts");
let post = posts.get(b.post_id);
let d = post.data;
let body = if d.body_md == () { "" } else { d.body_md };
let words = if body == "" { 0 } else { body.split(" ").len() };
let reading_time = (words / 200) + 1;

let excerpt = d.excerpt;
if excerpt == () || excerpt == "" {
    let parts = body.split(" ");
    let n = if parts.len() < 24 { parts.len() } else { 24 };
    let ex = "";
    for i in 0..n { ex += parts[i] + " "; }
    ex.trim();
    excerpt = ex + "…";
    d.excerpt = excerpt;
}
d.reading_time = reading_time;
posts.update(b.post_id, d);

#{ excerpt: excerpt, reading_time: reading_time }