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use libc::{c_int, c_void};
use std::marker::PhantomData;
use std::path::Path;
use std::ptr;
use crate::diff::{print_cb, LineCb};
use crate::util::{into_opt_c_string, Binding};
use crate::{raw, Blob, Buf, Diff, DiffDelta, DiffHunk, DiffLine, DiffOptions, Error};
/// A structure representing the text changes in a single diff delta.
///
/// This is an opaque structure.
pub struct Patch<'buffers> {
raw: *mut raw::git_patch,
buffers: PhantomData<&'buffers ()>,
}
unsafe impl<'buffers> Send for Patch<'buffers> {}
impl<'buffers> Binding for Patch<'buffers> {
type Raw = *mut raw::git_patch;
unsafe fn from_raw(raw: Self::Raw) -> Self {
Patch {
raw,
buffers: PhantomData,
}
}
fn raw(&self) -> Self::Raw {
self.raw
}
}
impl<'buffers> Drop for Patch<'buffers> {
fn drop(&mut self) {
unsafe { raw::git_patch_free(self.raw) }
}
}
impl<'buffers> Patch<'buffers> {
/// Return a Patch for one file in a Diff.
///
/// Returns Ok(None) for an unchanged or binary file.
pub fn from_diff(diff: &Diff<'buffers>, idx: usize) -> Result<Option<Self>, Error> {
let mut ret = ptr::null_mut();
unsafe {
try_call!(raw::git_patch_from_diff(&mut ret, diff.raw(), idx));
Ok(Binding::from_raw_opt(ret))
}
}
/// Generate a Patch by diffing two blobs.
pub fn from_blobs(
old_blob: &Blob<'buffers>,
old_path: Option<&Path>,
new_blob: &Blob<'buffers>,
new_path: Option<&Path>,
opts: Option<&mut DiffOptions>,
) -> Result<Self, Error> {
let mut ret = ptr::null_mut();
let old_path = into_opt_c_string(old_path)?;
let new_path = into_opt_c_string(new_path)?;
unsafe {
try_call!(raw::git_patch_from_blobs(
&mut ret,
old_blob.raw(),
old_path,
new_blob.raw(),
new_path,
opts.map(|s| s.raw())
));
Ok(Binding::from_raw(ret))
}
}
/// Generate a Patch by diffing a blob and a buffer.
pub fn from_blob_and_buffer(
old_blob: &Blob<'buffers>,
old_path: Option<&Path>,
new_buffer: &'buffers [u8],
new_path: Option<&Path>,
opts: Option<&mut DiffOptions>,
) -> Result<Self, Error> {
let mut ret = ptr::null_mut();
let old_path = into_opt_c_string(old_path)?;
let new_path = into_opt_c_string(new_path)?;
unsafe {
try_call!(raw::git_patch_from_blob_and_buffer(
&mut ret,
old_blob.raw(),
old_path,
new_buffer.as_ptr() as *const c_void,
new_buffer.len(),
new_path,
opts.map(|s| s.raw())
));
Ok(Binding::from_raw(ret))
}
}
/// Generate a Patch by diffing two buffers.
pub fn from_buffers(
old_buffer: &'buffers [u8],
old_path: Option<&Path>,
new_buffer: &'buffers [u8],
new_path: Option<&Path>,
opts: Option<&mut DiffOptions>,
) -> Result<Self, Error> {
crate::init();
let mut ret = ptr::null_mut();
let old_path = into_opt_c_string(old_path)?;
let new_path = into_opt_c_string(new_path)?;
unsafe {
try_call!(raw::git_patch_from_buffers(
&mut ret,
old_buffer.as_ptr() as *const c_void,
old_buffer.len(),
old_path,
new_buffer.as_ptr() as *const c_void,
new_buffer.len(),
new_path,
opts.map(|s| s.raw())
));
Ok(Binding::from_raw(ret))
}
}
/// Get the DiffDelta associated with the Patch.
pub fn delta(&self) -> DiffDelta<'buffers> {
unsafe { Binding::from_raw(raw::git_patch_get_delta(self.raw) as *mut _) }
}
/// Get the number of hunks in the Patch.
pub fn num_hunks(&self) -> usize {
unsafe { raw::git_patch_num_hunks(self.raw) }
}
/// Get the number of lines of context, additions, and deletions in the Patch.
pub fn line_stats(&self) -> Result<(usize, usize, usize), Error> {
let mut context = 0;
let mut additions = 0;
let mut deletions = 0;
unsafe {
try_call!(raw::git_patch_line_stats(
&mut context,
&mut additions,
&mut deletions,
self.raw
));
}
Ok((context, additions, deletions))
}
/// Get a DiffHunk and its total line count from the Patch.
pub fn hunk(&self, hunk_idx: usize) -> Result<(DiffHunk<'buffers>, usize), Error> {
let mut ret = ptr::null();
let mut lines = 0;
unsafe {
try_call!(raw::git_patch_get_hunk(
&mut ret, &mut lines, self.raw, hunk_idx
));
Ok((Binding::from_raw(ret), lines))
}
}
/// Get the number of lines in a hunk.
pub fn num_lines_in_hunk(&self, hunk_idx: usize) -> Result<usize, Error> {
unsafe { Ok(try_call!(raw::git_patch_num_lines_in_hunk(self.raw, hunk_idx)) as usize) }
}
/// Get a DiffLine from a hunk of the Patch.
pub fn line_in_hunk(
&self,
hunk_idx: usize,
line_of_hunk: usize,
) -> Result<DiffLine<'buffers>, Error> {
let mut ret = ptr::null();
unsafe {
try_call!(raw::git_patch_get_line_in_hunk(
&mut ret,
self.raw,
hunk_idx,
line_of_hunk
));
Ok(Binding::from_raw(ret))
}
}
/// Get the size of a Patch's diff data in bytes.
pub fn size(
&self,
include_context: bool,
include_hunk_headers: bool,
include_file_headers: bool,
) -> usize {
unsafe {
raw::git_patch_size(
self.raw,
include_context as c_int,
include_hunk_headers as c_int,
include_file_headers as c_int,
)
}
}
/// Print the Patch to text via a callback.
pub fn print(&mut self, mut line_cb: &mut LineCb<'_>) -> Result<(), Error> {
let ptr = &mut line_cb as *mut _ as *mut c_void;
unsafe {
let cb: raw::git_diff_line_cb = Some(print_cb);
try_call!(raw::git_patch_print(self.raw, cb, ptr));
Ok(())
}
}
/// Get the Patch text as a Buf.
pub fn to_buf(&mut self) -> Result<Buf, Error> {
let buf = Buf::new();
unsafe {
try_call!(raw::git_patch_to_buf(buf.raw(), self.raw));
}
Ok(buf)
}
}
impl<'buffers> std::fmt::Debug for Patch<'buffers> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> Result<(), std::fmt::Error> {
let mut ds = f.debug_struct("Patch");
ds.field("delta", &self.delta())
.field("num_hunks", &self.num_hunks());
if let Ok(line_stats) = &self.line_stats() {
ds.field("line_stats", line_stats);
}
ds.finish()
}
}
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