aboutsummaryrefslogtreecommitdiff
path: root/helix-vcs/src/lib.rs
blob: 97320d32518fb7f93e2896049f1666ff8c9bc4b5 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
use std::path::Path;

#[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) -> Option<Vec<u8>>;
}

#[doc(hidden)]
pub struct Dummy;
impl DiffProvider for Dummy {
    fn get_diff_base(&self, _file: &Path) -> Option<Vec<u8>> {
        None
    }
}

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| provider.get_diff_base(file))
    }
}

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 }
    }
}