thodg/libgit2/src/diff.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.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_h__
  #define INCLUDE_diff_h__
  
  #include "common.h"
  
  #include "git2/diff.h"
  #include "git2/patch.h"
  #include "git2/sys/diff.h"
  #include "git2/oid.h"
  
  #include "vector.h"
  #include "iterator.h"
  #include "repository.h"
  #include "pool.h"
  #include "odb.h"
  
  #define DIFF_OLD_PREFIX_DEFAULT "a/"
  #define DIFF_NEW_PREFIX_DEFAULT "b/"
  
  typedef enum {
  	GIT_DIFF_TYPE_UNKNOWN = 0,
  	GIT_DIFF_TYPE_GENERATED = 1,
  	GIT_DIFF_TYPE_PARSED = 2,
  } git_diff_origin_t;
  
  struct git_diff {
  	git_refcount     rc;
  	git_repository   *repo;
  	git_attr_session attrsession;
  	git_diff_origin_t type;
  	git_diff_options opts;
  	git_vector       deltas;    /* vector of git_diff_delta */
  	git_pool pool;
  	git_iterator_t old_src;
  	git_iterator_t new_src;
  	git_diff_perfdata perf;
  
  	int (*strcomp)(const char *, const char *);
  	int (*strncomp)(const char *, const char *, size_t);
  	int (*pfxcomp)(const char *str, const char *pfx);
  	int (*entrycomp)(const void *a, const void *b);
  
  	int (*patch_fn)(git_patch **out, git_diff *diff, size_t idx);
  	void (*free_fn)(git_diff *diff);
  };
  
  extern int git_diff_delta__format_file_header(
  	git_str *out,
  	const git_diff_delta *delta,
  	const char *oldpfx,
  	const char *newpfx,
  	int oid_strlen,
  	bool print_index);
  
  extern int git_diff_delta__cmp(const void *a, const void *b);
  extern int git_diff_delta__casecmp(const void *a, const void *b);
  
  extern int git_diff__entry_cmp(const void *a, const void *b);
  extern int git_diff__entry_icmp(const void *a, const void *b);
  
  #endif
  

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