rust/hg-core/src/filepatterns.rs

44346:d42eea9a0494

// This software may be used and distributed according to the terms of the
// GNU General Public License version 2 or any later version.

//! Handling of Mercurial-specific patterns.

use crate::{utils::SliceExt, FastHashMap, PatternError};
use lazy_static::lazy_static;
use regex::bytes::{NoExpand, Regex};
use std::fs::File;
use std::io::Read;
use std::path::{Path, PathBuf};
use std::vec::Vec;

lazy_static! {
    static ref RE_ESCAPE: Vec<Vec<u8>> = {

    /// A regexp that needn't match the start of a name
    RelRegexp,
    /// A path relative to repository root, which is matched non-recursively
    /// (will not match subdirectories)
    RootFiles,
}

/// Transforms a glob pattern into a regex
fn glob_to_re(pat: &[u8]) -> Vec<u8> {
    let mut input = pat;

        b"rootfilesin:" => Ok(PatternSyntax::RootFiles),
        b"relglob:" => Ok(PatternSyntax::RelGlob),
        b"relre:" => Ok(PatternSyntax::RelRegexp),
        b"glob:" => Ok(PatternSyntax::Glob),
        b"rootglob:" => Ok(PatternSyntax::RootGlob),
        _ => Err(PatternError::UnsupportedSyntax(
            String::from_utf8_lossy(kind).to_string(),
        )),
    }
}

            }
        }
        PatternSyntax::Glob | PatternSyntax::RootGlob => {
            [glob_to_re(pattern).as_slice(), GLOB_SUFFIX].concat()
        }
    }
}

const GLOB_SPECIAL_CHARACTERS: [u8; 7] =
    [b'*', b'?', b'[', b']', b'{', b'}', b'\\'];

    let pattern = match syntax {
        PatternSyntax::RootGlob
        | PatternSyntax::Path
        | PatternSyntax::RelGlob
        | PatternSyntax::RootFiles => normalize_path_bytes(&pattern),
        _ => pattern.to_owned(),
    };
    if *syntax == PatternSyntax::RootGlob
        && !pattern.iter().any(|b| GLOB_SPECIAL_CHARACTERS.contains(b))
    {

    }
}

pub type PatternResult<T> = Result<T, PatternError>;

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

44347:2fe89bec8011

// This software may be used and distributed according to the terms of the
// GNU General Public License version 2 or any later version.

//! Handling of Mercurial-specific patterns.

use crate::{
    utils::{
        files::{canonical_path, get_bytes_from_path, get_path_from_bytes},
        hg_path::{path_to_hg_path_buf, HgPathBuf, HgPathError},
        SliceExt,
    },
    FastHashMap, PatternError,
};
use lazy_static::lazy_static;
use regex::bytes::{NoExpand, Regex};
use std::fs::File;
use std::io::Read;
use std::ops::Deref;
use std::path::{Path, PathBuf};
use std::vec::Vec;

lazy_static! {
    static ref RE_ESCAPE: Vec<Vec<u8>> = {

    /// A regexp that needn't match the start of a name
    RelRegexp,
    /// A path relative to repository root, which is matched non-recursively
    /// (will not match subdirectories)
    RootFiles,
    /// A file of patterns to read and include
    Include,
    /// A file of patterns to match against files under the same directory
    SubInclude,
}

/// Transforms a glob pattern into a regex
fn glob_to_re(pat: &[u8]) -> Vec<u8> {
    let mut input = pat;

        b"rootfilesin:" => Ok(PatternSyntax::RootFiles),
        b"relglob:" => Ok(PatternSyntax::RelGlob),
        b"relre:" => Ok(PatternSyntax::RelRegexp),
        b"glob:" => Ok(PatternSyntax::Glob),
        b"rootglob:" => Ok(PatternSyntax::RootGlob),
        b"include:" => Ok(PatternSyntax::Include),
        b"subinclude:" => Ok(PatternSyntax::SubInclude),
        _ => Err(PatternError::UnsupportedSyntax(
            String::from_utf8_lossy(kind).to_string(),
        )),
    }
}

            }
        }
        PatternSyntax::Glob | PatternSyntax::RootGlob => {
            [glob_to_re(pattern).as_slice(), GLOB_SUFFIX].concat()
        }
        PatternSyntax::Include | PatternSyntax::SubInclude => unreachable!(),
    }
}

const GLOB_SPECIAL_CHARACTERS: [u8; 7] =
    [b'*', b'?', b'[', b']', b'{', b'}', b'\\'];

    let pattern = match syntax {
        PatternSyntax::RootGlob
        | PatternSyntax::Path
        | PatternSyntax::RelGlob
        | PatternSyntax::RootFiles => normalize_path_bytes(&pattern),
        PatternSyntax::Include | PatternSyntax::SubInclude => {
            return Err(PatternError::NonRegexPattern(entry.clone()))
        }
        _ => pattern.to_owned(),
    };
    if *syntax == PatternSyntax::RootGlob
        && !pattern.iter().any(|b| GLOB_SPECIAL_CHARACTERS.contains(b))
    {

    }
}

pub type PatternResult<T> = Result<T, PatternError>;

/// Wrapper for `read_pattern_file` that also recursively expands `include:`
/// patterns.
///
/// `subinclude:` is not treated as a special pattern here: unraveling them
/// needs to occur in the "ignore" phase.
pub fn get_patterns_from_file(
    pattern_file: impl AsRef<Path>,
    root_dir: impl AsRef<Path>,
) -> PatternResult<(Vec<IgnorePattern>, Vec<PatternFileWarning>)> {
    let (patterns, mut warnings) = read_pattern_file(&pattern_file, true)?;
    let patterns = patterns
        .into_iter()
        .flat_map(|entry| -> PatternResult<_> {
            let IgnorePattern {
                syntax,
                pattern,
                source: _,
            } = &entry;
            Ok(match syntax {
                PatternSyntax::Include => {
                    let inner_include =
                        root_dir.as_ref().join(get_path_from_bytes(&pattern));
                    let (inner_pats, inner_warnings) = get_patterns_from_file(
                        &inner_include,
                        root_dir.as_ref(),
                    )?;
                    warnings.extend(inner_warnings);
                    inner_pats
                }
                _ => vec![entry],
            })
        })
        .flatten()
        .collect();

    Ok((patterns, warnings))
}

/// Holds all the information needed to handle a `subinclude:` pattern.
pub struct SubInclude {
    /// Will be used for repository (hg) paths that start with this prefix.
    /// It is relative to the current working directory, so comparing against
    /// repository paths is painless.
    pub prefix: HgPathBuf,
    /// The file itself, containing the patterns
    pub path: PathBuf,
    /// Folder in the filesystem where this it applies
    pub root: PathBuf,
}

impl SubInclude {
    pub fn new(
        root_dir: impl AsRef<Path>,
        pattern: &[u8],
        source: impl AsRef<Path>,
    ) -> Result<SubInclude, HgPathError> {
        let normalized_source =
            normalize_path_bytes(&get_bytes_from_path(source));

        let source_root = get_path_from_bytes(&normalized_source);
        let source_root = source_root.parent().unwrap_or(source_root.deref());

        let path = source_root.join(get_path_from_bytes(pattern));
        let new_root = path.parent().unwrap_or(path.deref());

        let prefix = canonical_path(&root_dir, &root_dir, new_root)?;

        Ok(Self {
            prefix: path_to_hg_path_buf(prefix).and_then(|mut p| {
                if !p.is_empty() {
                    p.push(b'/');
                }
                Ok(p)
            })?,
            path: path.to_owned(),
            root: new_root.to_owned(),
        })
    }
}

/// Separate and pre-process subincludes from other patterns for the "ignore"
/// phase.
pub fn filter_subincludes(
    ignore_patterns: &[IgnorePattern],
    root_dir: impl AsRef<Path>,
) -> Result<(Vec<SubInclude>, Vec<&IgnorePattern>), HgPathError> {
    let mut subincludes = vec![];
    let mut others = vec![];

    for ignore_pattern in ignore_patterns.iter() {
        let IgnorePattern {
            syntax,
            pattern,
            source,
        } = ignore_pattern;
        if *syntax == PatternSyntax::SubInclude {
            subincludes.push(SubInclude::new(&root_dir, pattern, &source)?);
        } else {
            others.push(ignore_pattern)
        }
    }
    Ok((subincludes, others))
}

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