/*
* Copyright (C) the libgit2 contributors. All rights reserved.
*
* This file is part of libgit2, distributed under the GNU GPL v2 with
* a Linking Exception. For full terms see the included COPYING file.
*/
#ifndef INCLUDE_git_patch_h__
#define INCLUDE_git_patch_h__
#include "common.h"
#include "types.h"
#include "oid.h"
#include "diff.h"
/**
* @file git2/patch.h
* @brief Patch handling routines.
* @ingroup Git
* @{
*/
GIT_BEGIN_DECL
/**
* The diff patch is used to store all the text diffs for a delta.
*
* You can easily loop over the content of patches and get information about
* them.
*/
typedef struct git_patch git_patch;
/**
* Return a patch for an entry in the diff list.
*
* The `git_patch` is a newly created object contains the text diffs
* for the delta. You have to call `git_patch_free()` when you are
* done with it. You can use the patch object to loop over all the hunks
* and lines in the diff of the one delta.
*
* For an unchanged file or a binary file, no `git_patch` will be
* created, the output will be set to NULL, and the `binary` flag will be
* set true in the `git_diff_delta` structure.
*
* It is okay to pass NULL for either of the output parameters; if you pass
* NULL for the `git_patch`, then the text diff will not be calculated.
*
* @param out Output parameter for the delta patch object
* @param diff Diff list object
* @param idx Index into diff list
* @return 0 on success, other value < 0 on error
*/
GIT_EXTERN(int) git_patch_from_diff(
git_patch **out, git_diff *diff, size_t idx);
/**
* Directly generate a patch from the difference between two blobs.
*
* This is just like `git_diff_blobs()` except it generates a patch object
* for the difference instead of directly making callbacks. You can use the
* standard `git_patch` accessor functions to read the patch data, and
* you must call `git_patch_free()` on the patch when done.
*
* @param out The generated patch; NULL on error
* @param old_blob Blob for old side of diff, or NULL for empty blob
* @param old_as_path Treat old blob as if it had this filename; can be NULL
* @param new_blob Blob for new side of diff, or NULL for empty blob
* @param new_as_path Treat new blob as if it had this filename; can be NULL
* @param opts Options for diff, or NULL for default options
* @return 0 on success or error code < 0
*/
GIT_EXTERN(int) git_patch_from_blobs(
git_patch **out,
const git_blob *old_blob,
const char *old_as_path,
const git_blob *new_blob,
const char *new_as_path,
const git_diff_options *opts);
/**
* Directly generate a patch from the difference between a blob and a buffer.
*
* This is just like `git_diff_blob_to_buffer()` except it generates a patch
* object for the difference instead of directly making callbacks. You can
* use the standard `git_patch` accessor functions to read the patch
* data, and you must call `git_patch_free()` on the patch when done.
*
* @param out The generated patch; NULL on error
* @param old_blob Blob for old side of diff, or NULL for empty blob
* @param old_as_path Treat old blob as if it had this filename; can be NULL
* @param buffer Raw data for new side of diff, or NULL for empty
* @param buffer_len Length of raw data for new side of diff
* @param buffer_as_path Treat buffer as if it had this filename; can be NULL
* @param opts Options for diff, or NULL for default options
* @return 0 on success or error code < 0
*/
GIT_EXTERN(int) git_patch_from_blob_and_buffer(
git_patch **out,
const git_blob *old_blob,
const char *old_as_path,
const char *buffer,
size_t buffer_len,
const char *buffer_as_path,
const git_diff_options *opts);
/**
* Directly generate a patch from the difference between two buffers.
*
* This is just like `git_diff_buffers()` except it generates a patch
* object for the difference instead of directly making callbacks. You can
* use the standard `git_patch` accessor functions to read the patch
* data, and you must call `git_patch_free()` on the patch when done.
*
* @param out The generated patch; NULL on error
* @param old_buffer Raw data for old side of diff, or NULL for empty
* @param old_len Length of the raw data for old side of the diff
* @param old_as_path Treat old buffer as if it had this filename; can be NULL
* @param new_buffer Raw data for new side of diff, or NULL for empty
* @param new_len Length of raw data for new side of diff
* @param new_as_path Treat buffer as if it had this filename; can be NULL
* @param opts Options for diff, or NULL for default options
* @return 0 on success or error code < 0
*/
GIT_EXTERN(int) git_patch_from_buffers(
git_patch **out,
const void *old_buffer,
size_t old_len,
const char *old_as_path,
const char *new_buffer,
size_t new_len,
const char *new_as_path,
const git_diff_options *opts);
/**
* Free a git_patch object.
*/
GIT_EXTERN(void) git_patch_free(git_patch *patch);
/**
* Get the delta associated with a patch. This delta points to internal
* data and you do not have to release it when you are done with it.
*/
GIT_EXTERN(const git_diff_delta *) git_patch_get_delta(const git_patch *patch);
/**
* Get the number of hunks in a patch
*/
GIT_EXTERN(size_t) git_patch_num_hunks(const git_patch *patch);
/**
* Get line counts of each type in a patch.
*
* This helps imitate a diff --numstat type of output. For that purpose,
* you only need the `total_additions` and `total_deletions` values, but we
* include the `total_context` line count in case you want the total number
* of lines of diff output that will be generated.
*
* All outputs are optional. Pass NULL if you don't need a particular count.
*
* @param total_context Count of context lines in output, can be NULL.
* @param total_additions Count of addition lines in output, can be NULL.
* @param total_deletions Count of deletion lines in output, can be NULL.
* @param patch The git_patch object
* @return 0 on success, <0 on error
*/
GIT_EXTERN(int) git_patch_line_stats(
size_t *total_context,
size_t *total_additions,
size_t *total_deletions,
const git_patch *patch);
/**
* Get the information about a hunk in a patch
*
* Given a patch and a hunk index into the patch, this returns detailed
* information about that hunk. Any of the output pointers can be passed
* as NULL if you don't care about that particular piece of information.
*
* @param out Output pointer to git_diff_hunk of hunk
* @param lines_in_hunk Output count of total lines in this hunk
* @param patch Input pointer to patch object
* @param hunk_idx Input index of hunk to get information about
* @return 0 on success, GIT_ENOTFOUND if hunk_idx out of range, <0 on error
*/
GIT_EXTERN(int) git_patch_get_hunk(
const git_diff_hunk **out,
size_t *lines_in_hunk,
git_patch *patch,
size_t hunk_idx);
/**
* Get the number of lines in a hunk.
*
* @param patch The git_patch object
* @param hunk_idx Index of the hunk
* @return Number of lines in hunk or -1 if invalid hunk index
*/
GIT_EXTERN(int) git_patch_num_lines_in_hunk(
const git_patch *patch,
size_t hunk_idx);
/**
* Get data about a line in a hunk of a patch.
*
* Given a patch, a hunk index, and a line index in the hunk, this
* will return a lot of details about that line. If you pass a hunk
* index larger than the number of hunks or a line index larger than
* the number of lines in the hunk, this will return -1.
*
* @param out The git_diff_line data for this line
* @param patch The patch to look in
* @param hunk_idx The index of the hunk
* @param line_of_hunk The index of the line in the hunk
* @return 0 on success, <0 on failure
*/
GIT_EXTERN(int) git_patch_get_line_in_hunk(
const git_diff_line **out,
git_patch *patch,
size_t hunk_idx,
size_t line_of_hunk);
/**
* Look up size of patch diff data in bytes
*
* This returns the raw size of the patch data. This only includes the
* actual data from the lines of the diff, not the file or hunk headers.
*
* If you pass `include_context` as true (non-zero), this will be the size
* of all of the diff output; if you pass it as false (zero), this will
* only include the actual changed lines (as if `context_lines` was 0).
*
* @param patch A git_patch representing changes to one file
* @param include_context Include context lines in size if non-zero
* @param include_hunk_headers Include hunk header lines if non-zero
* @param include_file_headers Include file header lines if non-zero
* @return The number of bytes of data
*/
GIT_EXTERN(size_t) git_patch_size(
git_patch *patch,
int include_context,
int include_hunk_headers,
int include_file_headers);
/**
* Serialize the patch to text via callback.
*
* Returning a non-zero value from the callback will terminate the iteration
* and return that value to the caller.
*
* @param patch A git_patch representing changes to one file
* @param print_cb Callback function to output lines of the patch. Will be
* called for file headers, hunk headers, and diff lines.
* @param payload Reference pointer that will be passed to your callbacks.
* @return 0 on success, non-zero callback return value, or error code
*/
GIT_EXTERN(int) git_patch_print(
git_patch *patch,
git_diff_line_cb print_cb,
void *payload);
/**
* Get the content of a patch as a single diff text.
*
* @param out The git_buf to be filled in
* @param patch A git_patch representing changes to one file
* @return 0 on success, <0 on failure.
*/
GIT_EXTERN(int) git_patch_to_buf(
git_buf *out,
git_patch *patch);
GIT_END_DECL
/**@}*/
#endif