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use std::path::Path;
use ignore::{self, DirEntry};
use log;
/// A configuration for describing how subjects should be built.
#[derive(Clone, Debug)]
struct Config {
strip_dot_prefix: bool,
}
impl Default for Config {
fn default() -> Config {
Config { strip_dot_prefix: false }
}
}
/// A builder for constructing things to search over.
#[derive(Clone, Debug)]
pub struct SubjectBuilder {
config: Config,
}
impl SubjectBuilder {
/// Return a new subject builder with a default configuration.
pub fn new() -> SubjectBuilder {
SubjectBuilder { config: Config::default() }
}
/// Create a new subject from a possibly missing directory entry.
///
/// If the directory entry isn't present, then the corresponding error is
/// logged if messages have been configured. Otherwise, if the subject is
/// deemed searchable, then it is returned.
pub fn build_from_result(
&self,
result: Result<DirEntry, ignore::Error>,
) -> Option<Subject> {
match result {
Ok(dent) => self.build(dent),
Err(err) => {
err_message!("{}", err);
None
}
}
}
/// Create a new subject using this builder's configuration.
///
/// If a subject could not be created or should otherwise not be searched,
/// then this returns `None` after emitting any relevant log messages.
pub fn build(&self, dent: DirEntry) -> Option<Subject> {
let subj =
Subject { dent, strip_dot_prefix: self.config.strip_dot_prefix };
if let Some(ignore_err) = subj.dent.error() {
ignore_message!("{}", ignore_err);
}
// If this entry was explicitly provided by an end user, then we always
// want to search it.
if subj.is_explicit() {
return Some(subj);
}
// At this point, we only want to search something if it's explicitly a
// file. This omits symlinks. (If ripgrep was configured to follow
// symlinks, then they have already been followed by the directory
// traversal.)
if subj.is_file() {
return Some(subj);
}
// We got nothing. Emit a debug message, but only if this isn't a
// directory. Otherwise, emitting messages for directories is just
// noisy.
if !subj.is_dir() {
log::debug!(
"ignoring {}: failed to pass subject filter: \
file type: {:?}, metadata: {:?}",
subj.dent.path().display(),
subj.dent.file_type(),
subj.dent.metadata()
);
}
None
}
/// When enabled, if the subject's file path starts with `./` then it is
/// stripped.
///
/// This is useful when implicitly searching the current working directory.
pub fn strip_dot_prefix(&mut self, yes: bool) -> &mut SubjectBuilder {
self.config.strip_dot_prefix = yes;
self
}
}
/// A subject is a thing we want to search. Generally, a subject is either a
/// file or stdin.
#[derive(Clone, Debug)]
pub struct Subject {
dent: DirEntry,
strip_dot_prefix: bool,
}
impl Subject {
/// Return the file path corresponding to this subject.
///
/// If this subject corresponds to stdin, then a special `<stdin>` path
/// is returned instead.
pub fn path(&self) -> &Path {
if self.strip_dot_prefix && self.dent.path().starts_with("./") {
self.dent.path().strip_prefix("./").unwrap()
} else {
self.dent.path()
}
}
/// Returns true if and only if this entry corresponds to stdin.
pub fn is_stdin(&self) -> bool {
self.dent.is_stdin()
}
/// Returns true if and only if this entry corresponds to a subject to
/// search that was explicitly supplied by an end user.
///
/// Generally, this corresponds to either stdin or an explicit file path
/// argument. e.g., in `rg foo some-file ./some-dir/`, `some-file` is
/// an explicit subject, but, e.g., `./some-dir/some-other-file` is not.
///
/// However, note that ripgrep does not see through shell globbing. e.g.,
/// in `rg foo ./some-dir/*`, `./some-dir/some-other-file` will be treated
/// as an explicit subject.
pub fn is_explicit(&self) -> bool {
// stdin is obvious. When an entry has a depth of 0, that means it
// was explicitly provided to our directory iterator, which means it
// was in turn explicitly provided by the end user. The !is_dir check
// means that we want to search files even if their symlinks, again,
// because they were explicitly provided. (And we never want to try
// to search a directory.)
self.is_stdin() || (self.dent.depth() == 0 && !self.is_dir())
}
/// Returns true if and only if this subject points to a directory after
/// following symbolic links.
fn is_dir(&self) -> bool {
let ft = match self.dent.file_type() {
None => return false,
Some(ft) => ft,
};
if ft.is_dir() {
return true;
}
// If this is a symlink, then we want to follow it to determine
// whether it's a directory or not.
self.dent.path_is_symlink() && self.dent.path().is_dir()
}
/// Returns true if and only if this subject points to a file.
fn is_file(&self) -> bool {
self.dent.file_type().map_or(false, |ft| ft.is_file())
}
}
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