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Add git_diff_patch_print

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This adds a `git_diff_patch_print()` API which is more like the
existing API to "print" a patch from an entire `git_diff_list`
but operates on a single `git_diff_patch` object.

Also, it rewrites the `git_diff_patch_to_str()` API to use that
function (making it very small).
This commit is contained in:
Russell Belfer 2012-10-25 11:48:39 -07:00
parent 3943dc78a5
commit cb7180a6e2
2 changed files with 41 additions and 14 deletions
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19
include/git2/diff.h
View File

@ -603,11 +603,28 @@ GIT_EXTERN(int) git_diff_patch_get_line_in_hunk(
size_t hunk_idx,
size_t line_of_hunk);
/**
* Serialize the patch to text via callback.
*
* Returning a non-zero value from the callback will terminate the iteration
* and cause this return `GIT_EUSER`.
*
* @param patch A git_diff_patch representing changes to one file
* @param cb_data Reference pointer that will be passed to your callbacks.
* @param print_cb Callback function to output lines of the patch. Will be
* called for file headers, hunk headers, and diff lines.
* @return 0 on success, GIT_EUSER on non-zero callback, or error code
*/
GIT_EXTERN(int) git_diff_patch_print(
git_diff_patch *patch,
void *cb_data,
git_diff_data_fn print_cb);
/**
* Get the content of a patch as a single diff text.
*
* @param string Allocated string; caller must free.
* @param patch The patch to generate a string from.
* @param patch A git_diff_patch representing changes to one file
* @return 0 on success, <0 on failure.
*/
GIT_EXTERN(int) git_diff_patch_to_str(

36
src/diff_output.c
View File

@ -1511,26 +1511,25 @@ static int print_to_buffer_cb(
size_t content_len)
{
git_buf *output = cb_data;
GIT_UNUSED(delta);
GIT_UNUSED(range);
GIT_UNUSED(line_origin);
GIT_UNUSED(delta); GIT_UNUSED(range); GIT_UNUSED(line_origin);
return git_buf_put(output, content, content_len);
}
int git_diff_patch_to_str(
char **string,
git_diff_patch *patch)
int git_diff_patch_print(
git_diff_patch *patch,
void *cb_data,
git_diff_data_fn print_cb)
{
int error;
git_buf output = GIT_BUF_INIT, temp = GIT_BUF_INIT;
git_buf temp = GIT_BUF_INIT;
diff_print_info pi;
size_t h, l;
assert(string && patch);
assert(patch && print_cb);
pi.diff = patch->diff;
pi.print_cb = print_to_buffer_cb;
pi.cb_data = &output;
pi.print_cb = print_cb;
pi.cb_data = cb_data;
pi.buf = &temp;
error = print_patch_file(&pi, patch->delta, 0);
@ -1550,16 +1549,27 @@ int git_diff_patch_to_str(
}
}
git_buf_free(&temp);
return error;
}
int git_diff_patch_to_str(
char **string,
git_diff_patch *patch)
{
int error;
git_buf output = GIT_BUF_INIT;
error = git_diff_patch_print(patch, &output, print_to_buffer_cb);
/* GIT_EUSER means git_buf_put in print_to_buffer_cb returned -1,
* meaning a memory allocation failure, so just map to -1...
*/
if (error == GIT_EUSER)
error = -1;
git_buf_free(&temp);
*string = git_buf_detach(&output);
return error;
}