semora-cli 0.8.0

//! `semora push`: publish a file or folder.

use std::collections::BTreeMap;
use std::path::Path;

use anyhow::{Context, bail};
use semora_proto::PushResponse;
use serde_json::{Map, Value};

use crate::args::PushArgs;
use crate::bundle;
use crate::checkout::{self, Record};
use crate::client::{Client, PushQuery, encode_path};
use crate::project_link::{self, Link};
use crate::remember::{self, Memo};
use crate::{Ctx, docref, exit, output};

/// What to send for `path`: body, content type, single-file name, warnings.
pub struct Payload {
    pub body: Vec<u8>,
    pub content_type: &'static str,
    pub filename: Option<String>,
    /// The sha256 of each file sent, by its path in the pushed folder (`""` for a single file).
    pub hashes: BTreeMap<String, String>,
}

pub fn payload(path: &Path) -> anyhow::Result<Payload> {
    let meta =
        std::fs::metadata(path).with_context(|| format!("cannot read {}", path.display()))?;
    if meta.is_dir() {
        let packed = bundle::pack_dir(path)?;
        for (p, why) in &packed.skipped {
            output::warn(format!("skipped {p} ({why})"));
        }
        if packed.files.is_empty() {
            bail!("{} has no files Semora can serve", path.display());
        }
        if !packed.files.iter().any(|f| bundle::is_page(f)) {
            bail!("{} has no Markdown or HTML page", path.display());
        }
        return Ok(Payload {
            body: packed.tar,
            content_type: "application/x-tar",
            filename: None,
            hashes: packed.hashes,
        });
    }
    let name = path
        .file_name()
        .map(|n| n.to_string_lossy().into_owned())
        .unwrap_or_default();
    let lower = name.to_ascii_lowercase();
    let content_type = if lower.ends_with(".md") || lower.ends_with(".markdown") {
        "text/markdown; charset=utf-8"
    } else if lower.ends_with(".html") || lower.ends_with(".htm") {
        "text/html; charset=utf-8"
    } else {
        bail!("{name}: push a .md or .html file, or a folder");
    };
    let body = std::fs::read(path).with_context(|| format!("reading {}", path.display()))?;
    if content_type.starts_with("text/markdown") {
        let links = bundle::local_page_links(&String::from_utf8_lossy(&body));
        if !links.is_empty() {
            output::warn(format!(
                "{name} links to local pages ({}); push the folder to publish them together as a bundle",
                links.join(", ")
            ));
        }
    }
    Ok(Payload {
        hashes: [(String::new(), checkout::sha256(&body))].into(),
        body,
        content_type,
        filename: Some(name),
    })
}

/// `key=value` pairs; values that parse as JSON scalars keep their type.
pub fn parse_meta(pairs: &[String]) -> anyhow::Result<Option<String>> {
    if pairs.is_empty() {
        return Ok(None);
    }
    let mut m = Map::new();
    for p in pairs {
        let (k, v) = p
            .split_once('=')
            .with_context(|| format!("--meta `{p}` must be key=value"))?;
        let value = match serde_json::from_str::<Value>(v) {
            Ok(j @ (Value::Number(_) | Value::Bool(_) | Value::Null)) => j,
            _ => Value::String(v.to_string()),
        };
        m.insert(k.trim().to_string(), value);
    }
    Ok(Some(Value::Object(m).to_string()))
}

pub fn tags(args_tags: &[String], defaults: &[String]) -> Option<String> {
    let all: Vec<String> = args_tags
        .iter()
        .flat_map(|t| t.split(','))
        .chain(defaults.iter().map(String::as_str))
        .map(str::trim)
        .filter(|t| !t.is_empty())
        .map(str::to_string)
        .collect();
    (!all.is_empty()).then(|| all.join(","))
}

/// One line when `--id` or `--new` pushes outside the project that holds `path`.
pub fn note_outside_project(path: &Path, id: Option<&str>, new: bool) {
    if id.is_none() && !new {
        return;
    }
    let Ok(Some(link)) = project_link::find(path) else {
        return;
    };
    if id.is_some() {
        eprintln!(
            "note: --id pushes to that document directly, not into project {}.",
            link.slug
        );
    } else {
        eprintln!(
            "note: --new makes a document outside project {}.",
            link.slug
        );
    }
}

/// Adds a command's own way out of a `.semora` for another server: `flags` is `--id or --new`
/// for push, `--id` for watch. Other errors pass through.
pub fn hint_outside_project(err: anyhow::Error, flags: &str) -> anyhow::Error {
    if err.downcast_ref::<project_link::OtherServer>().is_some() {
        anyhow::anyhow!("{err} Or use {flags} to push outside the project.")
    } else {
        err
    }
}

/// An old server ignores the project parameters and makes a plain document.
pub fn check_filed(resp: &PushResponse, slug: &str) -> anyhow::Result<()> {
    if resp.project.is_none() {
        bail!(
            "the server did not file this under project `{slug}`; it may be older than this CLI. Update the server."
        );
    }
    Ok(())
}

/// A push the server refused because someone pushed after the revision this checkout has.
fn stale_push(
    client: &Client,
    link: &Link,
    key: &str,
    path: &Path,
    bundle: bool,
    err: &anyhow::Error,
) -> anyhow::Error {
    let shown = path.display();
    let url = client.url(&format!("/p/{}/{}", link.slug, encode_path(key)));
    let get = if bundle {
        format!("`semora show {url}` lists its files, `semora get {url} FILE` prints one")
    } else {
        format!("`semora get {url}` prints it")
    };
    exit::stale(format!(
        "{}. It changed on the server after this folder last pulled or pushed it. Merge the server's copy into {shown} ({get}) and push again with --force, or run `semora pull --force {shown}` to take the server's copy and drop your changes.",
        exit::message_of(err)
    ))
}

/// A push by key: the server updates the document at `key` in the project, or makes one. When
/// this checkout has a record of the document, the push names that revision, and the server
/// refuses it if someone pushed since; `force` leaves the revision out.
#[allow(clippy::too_many_arguments)]
async fn push_keyed(
    ctx: &Ctx,
    client: &Client,
    path: &Path,
    link: &Link,
    key: &str,
    p: Payload,
    mut q: PushQuery,
    force: bool,
) -> anyhow::Result<PushResponse> {
    let server = client.origin();
    q.project = Some(link.slug.clone());
    q.path = Some(key.to_string());
    q.origin = Some(project_link::origin_for(path));
    // An older document remembered for this path is carried into the project.
    q.adopt = remember::load(&ctx.settings.config_dir, path)
        .filter(|m| m.server == server)
        .map(|m| m.id);
    let known = if force {
        None
    } else {
        checkout::load(link)?.remove(key)
    };
    let if_match = known.map(|r| {
        q.base = Some(r.id);
        r.rev
    });
    let files: BTreeMap<String, String> = p
        .hashes
        .iter()
        .map(|(rel, hash)| {
            let local = if rel.is_empty() {
                key.to_string()
            } else {
                format!("{key}/{rel}")
            };
            (local, hash.clone())
        })
        .collect();
    let bundle = p.filename.is_none();
    let resp = match client
        .push(None, p.body, p.content_type, &q, if_match)
        .await
    {
        Ok(r) => r,
        Err(e) if exit::is_stale(&e) => {
            return Err(stale_push(client, link, key, path, bundle, &e));
        }
        Err(e) if exit::is_not_found(&e) => {
            return Err(exit::not_found(format!(
                "project `{}` was not found on {server}. Run `semora project init` to create it again, or you may no longer have access to this project.",
                link.slug
            )));
        }
        Err(e) if exit::is_conflict(&e) => bail!(
            "the server could not file this path in project `{}`: another push got there first, or you may no longer have access to this project. Try again.",
            link.slug
        ),
        Err(e) => return Err(e),
    };
    check_filed(&resp, &link.slug)?;
    let record = Record {
        id: resp.id.clone(),
        rev: resp.rev,
        kind: resp.kind,
        files,
    };
    if let Err(e) = checkout::update(link, |r| r.insert(key.to_string(), record)) {
        output::warn(format!(
            "could not record the pushed revision, so the next push of {key} can't check for newer ones: {e:#}"
        ));
    }
    Ok(resp)
}

/// Pushes `path`. Inside a project (a `.semora` above it) it goes by key, unless `--id` or
/// `--new` says otherwise; outside one it replaces the explicit or remembered document.
/// `force` pushes by key even when the server has a newer revision than this checkout.
pub async fn push_path(
    ctx: &Ctx,
    client: &Client,
    path: &Path,
    explicit_id: Option<&str>,
    force_new: bool,
    force: bool,
    query: &PushQuery,
) -> anyhow::Result<PushResponse> {
    // Decided before anything is read or packed, so a refusal costs nothing.
    let keyed = if explicit_id.is_none() && !force_new {
        match project_link::find(path)? {
            Some(link) => {
                link.check_server(client)?;
                let key = link.relative_path(path)?;
                Some((link, key))
            }
            None => None,
        }
    } else {
        None
    };
    let p = payload(path)?;
    let mut q = query.clone();
    q.filename = p.filename.clone();
    if let Some((link, key)) = &keyed {
        return push_keyed(ctx, client, path, link, key, p, q, force).await;
    }
    let server = client.origin();
    let config_dir = &ctx.settings.config_dir;
    let remembered = if force_new || explicit_id.is_some() {
        None
    } else {
        remember::load(config_dir, path)
            .filter(|m| m.server == server)
            .map(|m| m.id)
    };
    let explicit = match explicit_id {
        Some(s) => Some(docref::resolve(client, s).await?),
        None => None,
    };
    let target = explicit.clone().or(remembered.clone());
    let resp = match target {
        Some(id) => match client
            .push(Some(&id), p.body.clone(), p.content_type, &q, None)
            .await
        {
            Ok(r) => r,
            Err(e) if exit::is_not_found(&e) && explicit.is_none() => {
                output::warn(format!(
                    "the remembered document {id} is gone; pushing a new document"
                ));
                client.push(None, p.body, p.content_type, &q, None).await?
            }
            Err(e) => return Err(e),
        },
        None => client.push(None, p.body, p.content_type, &q, None).await?,
    };
    let memo = Memo {
        id: resp.id.clone(),
        server,
    };
    if let Err(e) = remember::save(config_dir, path, &memo) {
        output::warn(format!("could not remember the document id: {e:#}"));
    }
    Ok(resp)
}

/// One line on stderr when a push with a `--message` made no revision. A message belongs to a
/// revision, so an unchanged push has nowhere to keep it.
fn note_unrecorded_message(r: &PushResponse, message: Option<&str>) {
    if r.unchanged && message.is_some_and(|m| !m.trim().is_empty()) {
        eprintln!(
            "note: the content was unchanged, so no revision was made and the message was not recorded."
        );
    }
}

pub fn print_push(ctx: &Ctx, r: &PushResponse) {
    for b in &r.broken_links {
        output::warn(format!("broken link in {}: {}", b.from, b.href));
    }
    for w in &r.warnings {
        output::warn(w);
    }
    if ctx.json {
        output::json(r);
        return;
    }
    let files = if r.files == 1 {
        "1 file".to_string()
    } else {
        format!("{} files", r.files)
    };
    if r.unchanged {
        println!(
            "Nothing changed: \"{}\" stays at r{} · {} · {}",
            r.title, r.rev, r.kind, files
        );
    } else {
        println!(
            "Pushed \"{}\" · r{} · {} · {}",
            r.title, r.rev, r.kind, files
        );
    }
    if let Some(u) = &r.path_url {
        println!("  path  {u}");
    }
    println!("  url   {}", r.url);
    println!("  ws    {}", r.ws_url);
    println!("  wait  semora wait {}", r.id);
}

pub async fn run(ctx: &Ctx, args: PushArgs) -> anyhow::Result<i32> {
    let client = ctx.client()?;
    note_outside_project(&args.path, args.id.as_deref(), args.new);
    let query = PushQuery {
        title: args.title.clone(),
        tags: tags(&args.tags, &ctx.settings.default_tags),
        message: args.message.clone(),
        entry: args.entry.clone(),
        meta: parse_meta(&args.meta)?,
        ..Default::default()
    };
    let resp = push_path(
        ctx,
        &client,
        &args.path,
        args.id.as_deref(),
        args.new,
        args.force,
        &query,
    )
    .await
    .map_err(|e| hint_outside_project(e, "--id or --new"))?;
    note_unrecorded_message(&resp, args.message.as_deref());
    if args.wait {
        if !ctx.json {
            print_push(ctx, &resp);
        } else {
            // With --wait --json, stdout carries only the events.
            for b in &resp.broken_links {
                output::warn(format!("broken link in {}: {}", b.from, b.href));
            }
        }
        return crate::commands::wait::wait_for(ctx, &client, &resp.id, &args.wait_opts).await;
    }
    print_push(ctx, &resp);
    Ok(exit::OK)
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn meta_values_keep_scalar_types() {
        let m = parse_meta(&[
            "a=1".into(),
            "b=true".into(),
            "c=hello world".into(),
            "d=x=y".into(),
        ])
        .unwrap()
        .unwrap();
        let v: Value = serde_json::from_str(&m).unwrap();
        assert_eq!(
            v,
            serde_json::json!({"a": 1, "b": true, "c": "hello world", "d": "x=y"})
        );
        assert!(parse_meta(&["novalue".into()]).is_err());
        assert_eq!(parse_meta(&[]).unwrap(), None);
    }

    #[test]
    fn an_old_server_without_projects_is_reported() {
        let mut r = PushResponse {
            id: "k3F9xQ2mLp".into(),
            rev: 1,
            kind: semora_proto::DocKind::Md,
            url: "u".into(),
            ws_url: "w".into(),
            files: 1,
            title: "T".into(),
            unchanged: false,
            broken_links: vec![],
            warnings: vec![],
            project: None,
            path: None,
            path_url: None,
        };
        let err = check_filed(&r, "semora").unwrap_err().to_string();
        assert!(
            err.contains("older than this CLI") && err.contains("semora"),
            "{err}"
        );
        r.project = Some("semora".into());
        assert!(check_filed(&r, "semora").is_ok());
    }

    #[test]
    fn tags_merge_flags_and_defaults() {
        assert_eq!(
            tags(&["a,b".into(), "c".into()], &["proj".into()]).as_deref(),
            Some("a,b,c,proj")
        );
        assert_eq!(tags(&[], &[]), None);
    }
}