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