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//! lower-level access to filters which are applied to create working tree checkouts or to 'clean' working tree contents for storage in git.
use std::borrow::Cow;
pub use gix_filter as plumbing;
use gix_odb::{Find, FindExt};
use crate::{
bstr::BStr,
config::{
cache::util::{ApplyLeniency, ApplyLeniencyDefaultValue},
tree::Core,
},
Repository,
};
///
pub mod pipeline {
///
pub mod options {
use crate::{bstr::BString, config};
/// The error returned by [Pipeline::options()][crate::filter::Pipeline::options()].
#[derive(Debug, thiserror::Error)]
#[allow(missing_docs)]
pub enum Error {
#[error(transparent)]
CheckRoundTripEncodings(#[from] config::encoding::Error),
#[error(transparent)]
SafeCrlf(#[from] config::key::GenericErrorWithValue),
#[error("Could not interpret 'filter.{name}.required' configuration")]
Driver {
name: BString,
source: gix_config::value::Error,
},
}
}
///
pub mod convert_to_git {
/// The error returned by [Pipeline::convert_to_git()][crate::filter::Pipeline::convert_to_git()].
#[derive(Debug, thiserror::Error)]
#[allow(missing_docs)]
pub enum Error {
#[error("Failed to prime attributes to the path at which the data resides")]
WorktreeCacheAtPath(#[from] std::io::Error),
#[error(transparent)]
Convert(#[from] gix_filter::pipeline::convert::to_git::Error),
}
}
///
pub mod convert_to_worktree {
/// The error returned by [Pipeline::convert_to_worktree()][crate::filter::Pipeline::convert_to_worktree()].
#[derive(Debug, thiserror::Error)]
#[allow(missing_docs)]
pub enum Error {
#[error("Failed to prime attributes to the path at which the data resides")]
WorktreeCacheAtPath(#[from] std::io::Error),
#[error(transparent)]
Convert(#[from] gix_filter::pipeline::convert::to_worktree::Error),
}
}
}
/// A git pipeline for transforming data *to-git* and *to-worktree*, based
/// [on git configuration and attributes](https://git-scm.com/docs/gitattributes).
#[derive(Clone)]
pub struct Pipeline<'repo> {
inner: gix_filter::Pipeline,
cache: gix_worktree::Cache,
repo: &'repo Repository,
}
/// Lifecycle
impl<'repo> Pipeline<'repo> {
/// Extract options from `repo` that are needed to properly drive a standard git filter pipeline.
pub fn options(repo: &'repo Repository) -> Result<gix_filter::pipeline::Options, pipeline::options::Error> {
let config = &repo.config.resolved;
let encodings =
Core::CHECK_ROUND_TRIP_ENCODING.try_into_encodings(config.string_by_key("core.checkRoundtripEncoding"))?;
let safe_crlf = config
.string_by_key("core.safecrlf")
.map(|value| Core::SAFE_CRLF.try_into_safecrlf(value))
.transpose()
.map(Option::unwrap_or_default)
.with_lenient_default_value(
repo.config.lenient_config,
// in lenient mode, we prefer the safe option, instead of just (trying) to output warnings.
gix_filter::pipeline::CrlfRoundTripCheck::Fail,
)?;
let auto_crlf = config
.string_by_key("core.autocrlf")
.map(|value| Core::AUTO_CRLF.try_into_autocrlf(value))
.transpose()
.with_leniency(repo.config.lenient_config)?
.unwrap_or_default();
let eol = config
.string_by_key("core.eol")
.map(|value| Core::EOL.try_into_eol(value))
.transpose()?;
let drivers = extract_drivers(repo)?;
Ok(gix_filter::pipeline::Options {
drivers,
eol_config: gix_filter::eol::Configuration { auto_crlf, eol },
encodings_with_roundtrip_check: encodings,
crlf_roundtrip_check: safe_crlf,
object_hash: repo.object_hash(),
})
}
/// Create a new instance by extracting all necessary information and configuration from a `repo` along with `cache` for accessing
/// attributes. The `index` is used for some filters which may access it under very specific circumstances.
pub fn new(repo: &'repo Repository, cache: gix_worktree::Cache) -> Result<Self, pipeline::options::Error> {
let pipeline = gix_filter::Pipeline::new(cache.attributes_collection(), Self::options(repo)?);
Ok(Pipeline {
inner: pipeline,
cache,
repo,
})
}
/// Detach the repository and obtain the individual functional parts.
pub fn into_parts(self) -> (gix_filter::Pipeline, gix_worktree::Cache) {
(self.inner, self.cache)
}
}
/// Conversions
impl<'repo> Pipeline<'repo> {
/// Convert a `src` stream (to be found at `rela_path`, a repo-relative path) to a representation suitable for storage in `git`
/// by using all attributes at `rela_path` and configuration of the repository to know exactly which filters apply.
/// `index` is used in particularly rare cases where the CRLF filter in auto-mode tries to determine whether or not to apply itself,
/// and it should match the state used when [instantiating this instance][Self::new()].
/// Note that the return-type implements [`std::io::Read`].
pub fn convert_to_git<R>(
&mut self,
src: R,
rela_path: &std::path::Path,
index: &gix_index::State,
) -> Result<gix_filter::pipeline::convert::ToGitOutcome<'_, R>, pipeline::convert_to_git::Error>
where
R: std::io::Read,
{
let entry = self
.cache
.at_path(rela_path, Some(false), |id, buf| self.repo.objects.find_blob(id, buf))?;
Ok(self.inner.convert_to_git(
src,
rela_path,
|_, attrs| {
entry.matching_attributes(attrs);
},
|rela_path, buf| -> Result<_, crate::object::find::Error> {
let entry = match index.entry_by_path(rela_path) {
None => return Ok(None),
Some(entry) => entry,
};
let obj = self.repo.objects.try_find(entry.id, buf)?;
Ok(obj.filter(|obj| obj.kind == gix_object::Kind::Blob).map(|_| ()))
},
)?)
}
/// Convert a `src` buffer located at `rela_path` (in the index) from what's in `git` to the worktree representation.
/// This method will obtain all attributes and configuration necessary to know exactly which filters to apply.
/// Note that the return-type implements [`std::io::Read`].
///
/// Use `can_delay` to tell driver processes that they may delay the return of data. Doing this will require the caller to specifically
/// handle delayed files by keeping state and using [`Self::into_parts()`] to get access to the driver state to follow the delayed-files
/// protocol. For simplicity, most will want to disallow delayed processing.
pub fn convert_to_worktree<'input>(
&mut self,
src: &'input [u8],
rela_path: &BStr,
can_delay: gix_filter::driver::apply::Delay,
) -> Result<gix_filter::pipeline::convert::ToWorktreeOutcome<'input, '_>, pipeline::convert_to_worktree::Error>
{
let entry = self
.cache
.at_entry(rela_path, Some(false), |id, buf| self.repo.objects.find_blob(id, buf))?;
Ok(self.inner.convert_to_worktree(
src,
rela_path,
|_, attrs| {
entry.matching_attributes(attrs);
},
can_delay,
)?)
}
/// Retrieve the static context that is made available to the process filters.
///
/// The context set here is relevant for the [`convert_to_git()`][Self::convert_to_git()] and
/// [`convert_to_worktree()`][Self::convert_to_worktree()] methods.
pub fn driver_context_mut(&mut self) -> &mut gix_filter::pipeline::Context {
self.inner.driver_context_mut()
}
}
/// Obtain a list of all configured driver, but ignore those in sections that we don't trust enough.
fn extract_drivers(repo: &Repository) -> Result<Vec<gix_filter::Driver>, pipeline::options::Error> {
Ok(match repo.config.resolved.sections_by_name("filter") {
None => Vec::new(),
Some(sections) => sections
.filter(|s| repo.filter_config_section()(s.meta()))
.filter_map(|s| {
s.header().subsection_name().map(|name| {
Ok(gix_filter::Driver {
name: name.to_owned(),
clean: s.value("clean").map(Cow::into_owned),
smudge: s.value("smudge").map(Cow::into_owned),
process: s.value("process").map(Cow::into_owned),
required: s
.value("required")
.map(|value| gix_config::Boolean::try_from(value.as_ref()))
.transpose()
.map_err(|err| pipeline::options::Error::Driver {
name: name.to_owned(),
source: err,
})?
.unwrap_or_default()
.into(),
})
})
})
.collect::<Result<Vec<_>, pipeline::options::Error>>()?,
})
}