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