thodg/libgit2/src/diff_driver.h

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• Hash : f0e693b1
  Author :
  Date : 2021-09-07T17:53:49
  

  str: introduce `git_str` for internal, `git_buf` is external libgit2 has two distinct requirements that were previously solved by `git_buf`. We require: 1. A general purpose string class that provides a number of utility APIs for manipulating data (eg, concatenating, truncating, etc). 2. A structure that we can use to return strings to callers that they can take ownership of. By using a single class (`git_buf`) for both of these purposes, we have confused the API to the point that refactorings are difficult and reasoning about correctness is also difficult. Move the utility class `git_buf` to be called `git_str`: this represents its general purpose, as an internal string buffer class. The name also is an homage to Junio Hamano ("gitstr"). The public API remains `git_buf`, and has a much smaller footprint. It is generally only used as an "out" param with strict requirements that follow the documentation. (Exceptions exist for some legacy APIs to avoid breaking callers unnecessarily.) Utility functions exist to convert a user-specified `git_buf` to a `git_str` so that we can call internal functions, then converting it back again.

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• src/diff_driver.h

• /*
   * 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_diff_driver_h__
  #define INCLUDE_diff_driver_h__
  
  #include "common.h"
  
  #include "attr_file.h"
  #include "str.h"
  
  typedef struct git_diff_driver_registry git_diff_driver_registry;
  
  git_diff_driver_registry *git_diff_driver_registry_new(void);
  void git_diff_driver_registry_free(git_diff_driver_registry *);
  
  typedef struct git_diff_driver git_diff_driver;
  
  int git_diff_driver_lookup(git_diff_driver **, git_repository *,
  	git_attr_session *attrsession, const char *);
  void git_diff_driver_free(git_diff_driver *);
  
  /* diff option flags to force off and on for this driver */
  void git_diff_driver_update_options(uint32_t *option_flags, git_diff_driver *);
  
  /* returns -1 meaning "unknown", 0 meaning not binary, 1 meaning binary */
  int git_diff_driver_content_is_binary(
  	git_diff_driver *, const char *content, size_t content_len);
  
  typedef long (*git_diff_find_context_fn)(
  	const char *, long, char *, long, void *);
  
  typedef int (*git_diff_find_context_line)(
  	git_diff_driver *, git_str *);
  
  typedef struct {
  	git_diff_driver *driver;
  	git_diff_find_context_line match_line;
  	git_str line;
  } git_diff_find_context_payload;
  
  void git_diff_find_context_init(
  	git_diff_find_context_fn *findfn_out,
  	git_diff_find_context_payload *payload_out,
  	git_diff_driver *driver);
  
  void git_diff_find_context_clear(git_diff_find_context_payload *);
  
  #endif
  

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