wsb 0.275.7622

//! Every local path a manifest declares, and whether it still names anything.
//!
//! A manifest that depends on a sibling by path is making a claim about where
//! it sits in a tree — `../capdag/capdag-rs`, `file:../floom-uikit`,
//! `.package(path: "../../MacFabricLoomSDK")`. The claim is a count of `..`,
//! and the count is right until a repository moves.
//!
//! When one does, nothing says so. The manifest still parses, the file still
//! reads, and the failure arrives later and somewhere else: a build that
//! cannot resolve a dependency, an `ENOENT: stat` from a package manager
//! chasing a symlink into a directory that is not there, a language server
//! that silently stops resolving a package. Every one of those is hours from
//! its cause.
//!
//! So the claims are checked. This is the whole class, in one pass, over every
//! manifest kind this workspace uses — and it is part of `wsb check`, because
//! a path that no longer resolves is exactly what worktree integrity means.

use crate::prelude::*;
use std::path::{Path, PathBuf};

/// One declared path that names nothing.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Broken {
    /// The manifest making the claim, workspace-relative.
    pub manifest: String,
    /// What kind of declaration it is, for a reader who has to fix it.
    pub kind: &'static str,
    /// The path as written.
    pub declared: String,
    /// Where that resolves to, which is what does not exist.
    pub resolves_to: String,
}

/// Directories that hold other people's trees, or output.
fn skipped(name: &str) -> bool {
    matches!(
        name,
        "node_modules"
            | "target"
            | ".build"
            | ".git"
            | ".wsb"
            | "dist"
            | "out"
            | "build"
            | "DerivedData"
            | "vendor"
            | "__pycache__"
            | ".venv"
            | "retired_by_wsb"
            | "Pods"
    )
}

/// Every manifest under `root`, by file name.
fn manifests(root: &Path) -> Vec<PathBuf> {
    let mut found = Vec::new();
    let mut stack = vec![root.to_path_buf()];
    while let Some(dir) = stack.pop() {
        let Ok(entries) = std::fs::read_dir(&dir) else {
            continue;
        };
        for entry in entries.flatten() {
            let path = entry.path();
            let Some(name) = path.file_name().and_then(|n| n.to_str()) else {
                continue;
            };
            if path.is_dir() {
                if !skipped(name) {
                    stack.push(path);
                }
                continue;
            }
            let by_name = matches!(
                name,
                "Cargo.toml" | "Package.swift" | "package.json" | "package-lock.json"
            );
            let by_extension = path
                .extension()
                .and_then(|e| e.to_str())
                .is_some_and(|ext| matches!(ext, "pbxproj" | "xcscheme" | "xcconfig"));
            if by_name || by_extension {
                found.push(path);
            }
        }
    }
    found.sort();
    found
}

/// Check every declared local path in the worktree.
///
/// Relative paths only: an absolute one is a claim about a machine rather than
/// about this tree, and one that is wrong is wrong for a different reason.
pub fn check(root: &Path) -> Vec<Broken> {
    let mut broken = Vec::new();
    for manifest in manifests(root) {
        let Ok(text) = std::fs::read_to_string(&manifest) else {
            continue;
        };
        let base = manifest.parent().unwrap_or(root);
        let name = manifest
            .file_name()
            .and_then(|n| n.to_str())
            .unwrap_or_default();

        let declared: Vec<(&'static str, String)> = match name {
            "Cargo.toml" => quoted_after(&text, "path", "cargo path dependency"),
            "Package.swift" => swift_paths(&text),
            "package.json" => json_file_deps(&text),
            "package-lock.json" => lock_links(&text),
            _ => Vec::new(),
        };

        for (kind, path) in declared {
            if !path.starts_with('.') {
                continue;
            }
            let target = normalize(&base.join(&path));
            if target.exists() {
                continue;
            }
            broken.push(Broken {
                manifest: relative(&manifest, root),
                kind,
                declared: path,
                resolves_to: relative(&target, root),
            });
        }
    }
    broken
}

/// `path = "…"` — Cargo's spelling, and pyproject's.
fn quoted_after(text: &str, key: &str, kind: &'static str) -> Vec<(&'static str, String)> {
    let mut found = Vec::new();
    for line in text.lines() {
        let trimmed = line.trim_start();
        if trimmed.starts_with('#') {
            continue;
        }
        // Both `path = "…"` on its own line and `{ path = "…" }` inline.
        let mut rest = trimmed;
        while let Some(at) = rest.find(key) {
            rest = &rest[at + key.len()..];
            let after = rest.trim_start();
            let Some(after) = after.strip_prefix('=') else {
                continue;
            };
            let after = after.trim_start();
            if let Some(value) = quoted(after) {
                found.push((kind, value));
            }
        }
    }
    found
}

/// `.package(path: "…")` and `path: "…"` in a Swift manifest.
fn swift_paths(text: &str) -> Vec<(&'static str, String)> {
    let mut found = Vec::new();
    for line in text.lines() {
        let trimmed = line.trim_start();
        if trimmed.starts_with("//") {
            continue;
        }
        let mut rest = trimmed;
        while let Some(at) = rest.find("path:") {
            rest = &rest["path:".len() + at..];
            if let Some(value) = quoted(rest.trim_start()) {
                found.push(("swift package path", value));
            }
        }
    }
    found
}

/// `"name": "file:…"` in any dependency section.
fn json_file_deps(text: &str) -> Vec<(&'static str, String)> {
    let Ok(value) = serde_json::from_str::<serde_json::Value>(text) else {
        return Vec::new();
    };
    let mut found = Vec::new();
    for section in [
        "dependencies",
        "devDependencies",
        "optionalDependencies",
        "peerDependencies",
    ] {
        let Some(table) = value.get(section).and_then(serde_json::Value::as_object) else {
            continue;
        };
        for spec in table.values().filter_map(serde_json::Value::as_str) {
            if let Some(path) = spec
                .strip_prefix("file:")
                .or_else(|| spec.strip_prefix("link:"))
            {
                found.push(("npm file: dependency", path.to_string()));
            }
        }
    }
    found
}

/// A lockfile's linked packages — the copy of the claim that npm actually acts
/// on, and the one that goes stale without the manifest changing at all.
fn lock_links(text: &str) -> Vec<(&'static str, String)> {
    let Ok(value) = serde_json::from_str::<serde_json::Value>(text) else {
        return Vec::new();
    };
    let Some(packages) = value.get("packages").and_then(serde_json::Value::as_object) else {
        return Vec::new();
    };
    let mut found = Vec::new();
    for (key, entry) in packages {
        if key.starts_with("..") {
            found.push(("lockfile package", key.clone()));
        }
        if let Some(resolved) = entry.get("resolved").and_then(serde_json::Value::as_str) {
            if resolved.starts_with("..") {
                found.push(("lockfile link", resolved.to_string()));
            }
        }
    }
    found
}

/// The contents of the first double-quoted string.
fn quoted(text: &str) -> Option<String> {
    let rest = text.strip_prefix('"')?;
    let end = rest.find('"')?;
    Some(rest[..end].to_string())
}

/// `a/b/../c` → `a/c`, without touching the filesystem: the point is to report
/// where a path POINTS, including when nothing is there.
fn normalize(path: &Path) -> PathBuf {
    let mut out = PathBuf::new();
    for part in path.components() {
        match part {
            std::path::Component::ParentDir => {
                out.pop();
            }
            std::path::Component::CurDir => {}
            other => out.push(other.as_os_str()),
        }
    }
    out
}

fn relative(path: &Path, root: &Path) -> String {
    crate::platform::slash_path(path.strip_prefix(root).unwrap_or(path))
}

/// An absolute path, committed, under somebody's home directory.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct HomeRooted {
    pub manifest: String,
    pub line: usize,
    pub path: String,
}

/// Absolute paths into a home directory, in files the repository carries.
///
/// A relative path can be wrong after a move; an absolute one under `/Users/x`
/// or `/home/x` is wrong for everybody except x, and stays wrong. It is not a
/// configuration — it is one machine's layout, committed.
///
/// This is what an Xcode legacy target's `buildToolPath` was: the full path to
/// a script in one developer's checkout, which stopped resolving on that
/// developer's own machine the day the client moved into the app superrepo,
/// and had never resolved on anybody else's.
///
/// Only files git TRACKS are considered. A machine-local `.wsb/state.json`
/// records absolute paths because that is exactly its job.
pub fn home_rooted(root: &Path) -> Vec<HomeRooted> {
    // `/Users/<name>/` and `/home/<name>/` — a home directory with something
    // in it. `/Users/Shared` and a bare `/home` are not one person's.
    let pattern = regex_lite_home();
    let mut found = Vec::new();
    for manifest in manifests(root) {
        let relative_path = relative(&manifest, root);
        if !tracked(&manifest) {
            continue;
        }
        let Ok(text) = std::fs::read_to_string(&manifest) else {
            continue;
        };
        for (number, line) in text.lines().enumerate() {
            for hit in pattern(line) {
                found.push(HomeRooted {
                    manifest: relative_path.clone(),
                    line: number + 1,
                    path: hit,
                });
            }
        }
    }
    found
}

/// Whether git has this file. An untracked one is somebody's own state.
///
/// Asked of the repository the file is IN. A superproject's git answers "not
/// tracked" for every file inside a submodule, which would silently excuse the
/// whole worktree from this check.
fn tracked(file: &Path) -> bool {
    let Some(repository) = repository_of(file) else {
        return false;
    };
    let Ok(relative_path) = file.strip_prefix(&repository) else {
        return false;
    };
    crate::git_backend::git_command()
        .arg("-C")
        .arg(&repository)
        .args(["ls-files", "--error-unmatch"])
        .arg(relative_path)
        .stdout(std::process::Stdio::null())
        .stderr(std::process::Stdio::null())
        .status()
        .map(|status| status.success())
        .unwrap_or(false)
}

/// The nearest enclosing repository — the one whose git knows this file.
fn repository_of(file: &Path) -> Option<PathBuf> {
    let mut at = file.parent()?;
    loop {
        // A submodule's `.git` is a FILE pointing at the real directory, so
        // existence is the test rather than being a directory.
        if at.join(".git").exists() {
            return Some(at.to_path_buf());
        }
        at = at.parent()?;
    }
}

/// Every `/Users/<name>/…` or `/home/<name>/…` in one line.
///
/// Hand-rolled rather than a regular expression: this crate has no regex
/// dependency, and the shape is two literals and a scan.
fn regex_lite_home() -> impl Fn(&str) -> Vec<String> {
    |line: &str| {
        let mut found = Vec::new();
        for prefix in ["/Users/", "/home/"] {
            let mut rest = line;
            while let Some(at) = rest.find(prefix) {
                let tail = &rest[at..];
                let end = tail
                    .find(|c: char| c.is_whitespace() || c == '"' || c == ';' || c == '\'')
                    .unwrap_or(tail.len());
                let path = &tail[..end];
                // A home directory with a name and something under it:
                // `/Users/x/y`, not `/Users` or `/home/`.
                let parts: Vec<&str> = path.trim_end_matches('/').split('/').collect();
                if parts.len() > 3 && !parts[2].is_empty() {
                    found.push(path.to_string());
                }
                rest = &tail[end.max(1)..];
            }
        }
        found
    }
}

/// A source file the repository does not have.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Hidden {
    /// The file, worktree-relative.
    pub path: String,
    /// The ignore rule that hides it, as `git check-ignore -v` states it.
    pub rule: String,
}

/// Source files git is ignoring.
///
/// The other half of "does the tree contain what the build reads". An ignore
/// pattern meant for output — `logs/`, `build/`, `dist/` — is unanchored
/// unless it is written with a leading slash, so it matches a directory of
/// that name at ANY depth. A source directory that happens to share the name
/// is then invisible: `git status` reports a clean tree, `git add -A` adds
/// nothing, `commit -a` records the deletions around it and none of it, and
/// the loss is discovered on another machine as a module that does not exist.
///
/// That is not hypothetical. `src/logs/` — the module that implements this
/// logging — was swallowed by a bare `logs/`, and the next machine to pull
/// could not compile.
///
/// Asked of git rather than of the patterns: `check-ignore` is the authority
/// on what git will do, and re-implementing pattern matching would produce a
/// second opinion that is wrong in exactly the cases that matter.
pub fn hidden_source(root: &Path) -> Vec<Hidden> {
    // EVERY repository, not just the outermost one. `git ls-files` answers
    // only about the repository it is run in, and a superproject's git knows
    // nothing about the files inside its submodules — which is nearly every
    // file here. Asked only at the top, this check reported a clean worktree
    // by looking at a fraction of it.
    let mut found = Vec::new();
    for repository in crate::catalogue::scan::repositories(root) {
        for mut hidden in hidden_source_in(&repository) {
            // Named from the worktree, so a report says where to look.
            if let Ok(prefix) = repository.strip_prefix(root) {
                if !prefix.as_os_str().is_empty() {
                    hidden.path = format!("{}/{}", crate::platform::slash_path(prefix), hidden.path);
                }
            }
            found.push(hidden);
        }
    }
    found
}

/// The same question, of one repository.
fn hidden_source_in(root: &Path) -> Vec<Hidden> {
    const SOURCE: [&str; 9] = ["rs", "swift", "go", "py", "ts", "tsx", "svelte", "proto", "sql"];
    // Directories that hold output or other people's trees. A source file
    // under one of these is ignored on purpose.
    const OUTPUT: [&str; 14] = [
        "node_modules", "target", ".build", "dist", "out", "build", "DerivedData",
        "__pycache__", ".venv", "vendor", "generated", "Generated", ".scrap",
        "coverage",
    ];

    // Through the one git constructor in this crate: it strips the repository
    // scoping a parent may have inherited — a check that read ANOTHER
    // repository's ignore rules would report confidently about the wrong tree
    // — and packages the subprocess into the run's output like every other.
    let listed = crate::git_backend::git_command()
        .arg("-C")
        .arg(root)
        .args(["ls-files", "--others", "--ignored", "--exclude-standard"])
        .output();
    let Ok(listed) = listed else {
        return Vec::new();
    };
    if !listed.status.success() {
        return Vec::new();
    }

    let mut hidden = Vec::new();
    for line in String::from_utf8_lossy(&listed.stdout).lines() {
        let path = Path::new(line);
        let is_source = path
            .extension()
            .and_then(|e| e.to_str())
            .is_some_and(|ext| SOURCE.contains(&ext));
        if !is_source {
            continue;
        }
        if path
            .components()
            .filter_map(|c| c.as_os_str().to_str())
            .any(|part| OUTPUT.contains(&part) || part.starts_with("dist-"))
        {
            continue;
        }
        // Which rule hides it, so the report says what to change.
        let rule = crate::git_backend::git_command()
            .arg("-C")
            .arg(root)
            .args(["check-ignore", "-v", line])
            .output()
            .ok()
            .map(|out| String::from_utf8_lossy(&out.stdout).trim().to_string())
            .filter(|text| !text.is_empty())
            .unwrap_or_else(|| "an ignore rule".to_string());
        hidden.push(Hidden {
            path: line.to_string(),
            rule,
        });
    }
    hidden
}

#[cfg(test)]
#[path = "local_paths_tests.rs"]
mod tests;