annotate rust/hg-cpython/src/dirstate/status.rs @ 47890:3853e6ee160d

dirstatemap: replace `removefile` by an explicit `entry.set_untracked()`

All the other caller goes through `reset_state`, so we can safely have an
explicit method on `DirstateItem` object.
This means that all the logic to preserve the previous state (from p2, merged,
etc) is now properly encapsulated within the DirstateItem. This pave the way to
using different storage for these information.

Differential Revision: https://phab.mercurial-scm.org/D11315

// status.rs
//
// Copyright 2019, Raphaël Gomès <[e-mail]>
//
// This software may be used and distributed according to the terms of the
// GNU General Public License version 2 or any later version.

//! Bindings for the `hg::status` module provided by the
//! `hg-core` crate. From Python, this will be seen as
//! `rustext.dirstate.status`.

use crate::{dirstate::DirstateMap, exceptions::FallbackError};
use cpython::exc::OSError;
use cpython::{
    exc::ValueError, ObjectProtocol, PyBytes, PyErr, PyList, PyObject,
    PyResult, PyTuple, Python, PythonObject, ToPyObject,
};
use hg::{
    matchers::{AlwaysMatcher, FileMatcher, IncludeMatcher},
    parse_pattern_syntax,
    utils::{
        files::{get_bytes_from_path, get_path_from_bytes},
        hg_path::{HgPath, HgPathBuf},
    },
    BadMatch, DirstateStatus, IgnorePattern, PatternFileWarning, StatusError,
    StatusOptions,
};
use std::borrow::Borrow;

/// This will be useless once trait impls for collection are added to `PyBytes`
/// upstream.
fn collect_pybytes_list(
    py: Python,
    collection: &[impl AsRef<HgPath>],
) -> PyList {
    let list = PyList::new(py, &[]);

    for path in collection.iter() {
        list.append(
            py,
            PyBytes::new(py, path.as_ref().as_bytes()).into_object(),
        )
    }

    list
}

fn collect_bad_matches(
    py: Python,
    collection: &[(impl AsRef<HgPath>, BadMatch)],
) -> PyResult<PyList> {
    let list = PyList::new(py, &[]);

    let os = py.import("os")?;
    let get_error_message = |code: i32| -> PyResult<_> {
        os.call(
            py,
            "strerror",
            PyTuple::new(py, &[code.to_py_object(py).into_object()]),
            None,
        )
    };

    for (path, bad_match) in collection.iter() {
        let message = match bad_match {
            BadMatch::OsError(code) => get_error_message(*code)?,
            BadMatch::BadType(bad_type) => format!(
                "unsupported file type (type is {})",
                bad_type.to_string()
            )
            .to_py_object(py)
            .into_object(),
        };
        list.append(
            py,
            (PyBytes::new(py, path.as_ref().as_bytes()), message)
                .to_py_object(py)
                .into_object(),
        )
    }

    Ok(list)
}

fn handle_fallback(py: Python, err: StatusError) -> PyErr {
    match err {
        StatusError::Pattern(e) => {
            let as_string = e.to_string();
            log::trace!("Rust status fallback: `{}`", &as_string);

            PyErr::new::<FallbackError, _>(py, &as_string)
        }
        StatusError::IO(e) => PyErr::new::<OSError, _>(py, e.to_string()),
        e => PyErr::new::<ValueError, _>(py, e.to_string()),
    }
}

pub fn status_wrapper(
    py: Python,
    dmap: DirstateMap,
    matcher: PyObject,
    root_dir: PyObject,
    ignore_files: PyList,
    check_exec: bool,
    last_normal_time: i64,
    list_clean: bool,
    list_ignored: bool,
    list_unknown: bool,
    collect_traversed_dirs: bool,
) -> PyResult<PyTuple> {
    let bytes = root_dir.extract::<PyBytes>(py)?;
    let root_dir = get_path_from_bytes(bytes.data(py));

    let dmap: DirstateMap = dmap.to_py_object(py);
    let mut dmap = dmap.get_inner_mut(py);

    let ignore_files: PyResult<Vec<_>> = ignore_files
        .iter(py)
        .map(|b| {
            let file = b.extract::<PyBytes>(py)?;
            Ok(get_path_from_bytes(file.data(py)).to_owned())
        })
        .collect();
    let ignore_files = ignore_files?;

    match matcher.get_type(py).name(py).borrow() {
        "alwaysmatcher" => {
            let matcher = AlwaysMatcher;
            let (status_res, warnings) = dmap
                .status(
                    &matcher,
                    root_dir.to_path_buf(),
                    ignore_files,
                    StatusOptions {
                        check_exec,
                        last_normal_time,
                        list_clean,
                        list_ignored,
                        list_unknown,
                        collect_traversed_dirs,
                    },
                )
                .map_err(|e| handle_fallback(py, e))?;
            build_response(py, status_res, warnings)
        }
        "exactmatcher" => {
            let files = matcher.call_method(
                py,
                "files",
                PyTuple::new(py, &[]),
                None,
            )?;
            let files: PyList = files.cast_into(py)?;
            let files: PyResult<Vec<HgPathBuf>> = files
                .iter(py)
                .map(|f| {
                    Ok(HgPathBuf::from_bytes(
                        f.extract::<PyBytes>(py)?.data(py),
                    ))
                })
                .collect();

            let files = files?;
            let matcher = FileMatcher::new(files.as_ref())
                .map_err(|e| PyErr::new::<ValueError, _>(py, e.to_string()))?;
            let (status_res, warnings) = dmap
                .status(
                    &matcher,
                    root_dir.to_path_buf(),
                    ignore_files,
                    StatusOptions {
                        check_exec,
                        last_normal_time,
                        list_clean,
                        list_ignored,
                        list_unknown,
                        collect_traversed_dirs,
                    },
                )
                .map_err(|e| handle_fallback(py, e))?;
            build_response(py, status_res, warnings)
        }
        "includematcher" => {
            // Get the patterns from Python even though most of them are
            // redundant with those we will parse later on, as they include
            // those passed from the command line.
            let ignore_patterns: PyResult<Vec<_>> = matcher
                .getattr(py, "_kindpats")?
                .iter(py)?
                .map(|k| {
                    let k = k?;
                    let syntax = parse_pattern_syntax(
                        &[
                            k.get_item(py, 0)?
                                .extract::<PyBytes>(py)?
                                .data(py),
                            &b":"[..],
                        ]
                        .concat(),
                    )
                    .map_err(|e| {
                        handle_fallback(py, StatusError::Pattern(e))
                    })?;
                    let pattern = k.get_item(py, 1)?.extract::<PyBytes>(py)?;
                    let pattern = pattern.data(py);
                    let source = k.get_item(py, 2)?.extract::<PyBytes>(py)?;
                    let source = get_path_from_bytes(source.data(py));
                    let new = IgnorePattern::new(syntax, pattern, source);
                    Ok(new)
                })
                .collect();

            let ignore_patterns = ignore_patterns?;

            let matcher = IncludeMatcher::new(ignore_patterns)
                .map_err(|e| handle_fallback(py, e.into()))?;

            let (status_res, warnings) = dmap
                .status(
                    &matcher,
                    root_dir.to_path_buf(),
                    ignore_files,
                    StatusOptions {
                        check_exec,
                        last_normal_time,
                        list_clean,
                        list_ignored,
                        list_unknown,
                        collect_traversed_dirs,
                    },
                )
                .map_err(|e| handle_fallback(py, e))?;

            build_response(py, status_res, warnings)
        }
        e => Err(PyErr::new::<ValueError, _>(
            py,
            format!("Unsupported matcher {}", e),
        )),
    }
}

fn build_response(
    py: Python,
    status_res: DirstateStatus,
    warnings: Vec<PatternFileWarning>,
) -> PyResult<PyTuple> {
    let modified = collect_pybytes_list(py, status_res.modified.as_ref());
    let added = collect_pybytes_list(py, status_res.added.as_ref());
    let removed = collect_pybytes_list(py, status_res.removed.as_ref());
    let deleted = collect_pybytes_list(py, status_res.deleted.as_ref());
    let clean = collect_pybytes_list(py, status_res.clean.as_ref());
    let ignored = collect_pybytes_list(py, status_res.ignored.as_ref());
    let unknown = collect_pybytes_list(py, status_res.unknown.as_ref());
    let unsure = collect_pybytes_list(py, status_res.unsure.as_ref());
    let bad = collect_bad_matches(py, status_res.bad.as_ref())?;
    let traversed = collect_pybytes_list(py, status_res.traversed.as_ref());
    let dirty = status_res.dirty.to_py_object(py);
    let py_warnings = PyList::new(py, &[]);
    for warning in warnings.iter() {
        // We use duck-typing on the Python side for dispatch, good enough for
        // now.
        match warning {
            PatternFileWarning::InvalidSyntax(file, syn) => {
                py_warnings.append(
                    py,
                    (
                        PyBytes::new(py, &get_bytes_from_path(&file)),
                        PyBytes::new(py, syn),
                    )
                        .to_py_object(py)
                        .into_object(),
                );
            }
            PatternFileWarning::NoSuchFile(file) => py_warnings.append(
                py,
                PyBytes::new(py, &get_bytes_from_path(&file)).into_object(),
            ),
        }
    }

    Ok(PyTuple::new(
        py,
        &[
            unsure.into_object(),
            modified.into_object(),
            added.into_object(),
            removed.into_object(),
            deleted.into_object(),
            clean.into_object(),
            ignored.into_object(),
            unknown.into_object(),
            py_warnings.into_object(),
            bad.into_object(),
            traversed.into_object(),
            dirty.into_object(),
        ][..],
    ))
}