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use anyhow::{bail, Result};
use arc_swap::ArcSwap;
use std::{path::Path, sync::Arc};
#[cfg(feature = "git")]
pub use git::Git;
#[cfg(not(feature = "git"))]
pub use Dummy as Git;
#[cfg(feature = "git")]
mod git;
mod diff;
pub use diff::{DiffHandle, Hunk};
pub trait DiffProvider {
/// Returns the data that a diff should be computed against
/// if this provider is used.
/// The data is returned as raw byte without any decoding or encoding performed
/// to ensure all file encodings are handled correctly.
fn get_diff_base(&self, file: &Path) -> Result<Vec<u8>>;
fn get_current_head_name(&self, file: &Path) -> Result<Arc<ArcSwap<Box<str>>>>;
}
#[doc(hidden)]
pub struct Dummy;
impl DiffProvider for Dummy {
fn get_diff_base(&self, _file: &Path) -> Result<Vec<u8>> {
bail!("helix was compiled without git support")
}
fn get_current_head_name(&self, _file: &Path) -> Result<Arc<ArcSwap<Box<str>>>> {
bail!("helix was compiled without git support")
}
}
pub struct DiffProviderRegistry {
providers: Vec<Box<dyn DiffProvider>>,
}
impl DiffProviderRegistry {
pub fn get_diff_base(&self, file: &Path) -> Option<Vec<u8>> {
self.providers
.iter()
.find_map(|provider| match provider.get_diff_base(file) {
Ok(res) => Some(res),
Err(err) => {
log::info!("{err:#?}");
log::info!("failed to open diff base for {}", file.display());
None
}
})
}
pub fn get_current_head_name(&self, file: &Path) -> Option<Arc<ArcSwap<Box<str>>>> {
self.providers
.iter()
.find_map(|provider| match provider.get_current_head_name(file) {
Ok(res) => Some(res),
Err(err) => {
log::info!("{err:#?}");
log::info!("failed to obtain current head name for {}", file.display());
None
}
})
}
}
impl Default for DiffProviderRegistry {
fn default() -> Self {
// currently only git is supported
// TODO make this configurable when more providers are added
let git: Box<dyn DiffProvider> = Box::new(Git);
let providers = vec![git];
DiffProviderRegistry { providers }
}
}
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