thodg/libgit2/src/sysdir.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/sysdir.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_sysdir_h__
  #define INCLUDE_sysdir_h__
  
  #include "common.h"
  
  #include "posix.h"
  #include "str.h"
  
  /**
   * Find a "global" file (i.e. one in a user's home directory).
   *
   * @param path buffer to write the full path into
   * @param filename name of file to find in the home directory
   * @return 0 if found, GIT_ENOTFOUND if not found, or -1 on other OS error
   */
  extern int git_sysdir_find_global_file(git_str *path, const char *filename);
  
  /**
   * Find an "XDG" file (i.e. one in user's XDG config path).
   *
   * @param path buffer to write the full path into
   * @param filename name of file to find in the home directory
   * @return 0 if found, GIT_ENOTFOUND if not found, or -1 on other OS error
   */
  extern int git_sysdir_find_xdg_file(git_str *path, const char *filename);
  
  /**
   * Find a "system" file (i.e. one shared for all users of the system).
   *
   * @param path buffer to write the full path into
   * @param filename name of file to find in the home directory
   * @return 0 if found, GIT_ENOTFOUND if not found, or -1 on other OS error
   */
  extern int git_sysdir_find_system_file(git_str *path, const char *filename);
  
  /**
   * Find a "ProgramData" file (i.e. one in %PROGRAMDATA%)
   *
   * @param path buffer to write the full path into
   * @param filename name of file to find in the ProgramData directory
   * @return 0 if found, GIT_ENOTFOUND if not found, or -1 on other OS error
   */
  extern int git_sysdir_find_programdata_file(git_str *path, const char *filename);
  
  /**
   * Find template directory.
   *
   * @param path buffer to write the full path into
   * @return 0 if found, GIT_ENOTFOUND if not found, or -1 on other OS error
   */
  extern int git_sysdir_find_template_dir(git_str *path);
  
  /**
   * Expand the name of a "global" file (i.e. one in a user's home
   * directory).  Unlike `find_global_file` (above), this makes no
   * attempt to check for the existence of the file, and is useful if
   * you want the full path regardless of existence.
   *
   * @param path buffer to write the full path into
   * @param filename name of file in the home directory
   * @return 0 on success or -1 on error
   */
  extern int git_sysdir_expand_global_file(git_str *path, const char *filename);
  
  typedef enum {
  	GIT_SYSDIR_SYSTEM = 0,
  	GIT_SYSDIR_GLOBAL = 1,
  	GIT_SYSDIR_XDG    = 2,
  	GIT_SYSDIR_PROGRAMDATA = 3,
  	GIT_SYSDIR_TEMPLATE = 4,
  	GIT_SYSDIR__MAX   = 5,
  } git_sysdir_t;
  
  /**
   * Configures global data for configuration file search paths.
   *
   * @return 0 on success, <0 on failure
   */
  extern int git_sysdir_global_init(void);
  
  /**
   * Get the search path for global/system/xdg files
   *
   * @param out pointer to git_str containing search path
   * @param which which list of paths to return
   * @return 0 on success, <0 on failure
   */
  extern int git_sysdir_get(const git_str **out, git_sysdir_t which);
  
  /**
   * Set search paths for global/system/xdg files
   *
   * The first occurrence of the magic string "$PATH" in the new value will
   * be replaced with the old value of the search path.
   *
   * @param which Which search path to modify
   * @param paths New search path (separated by GIT_PATH_LIST_SEPARATOR)
   * @return 0 on success, <0 on failure (allocation error)
   */
  extern int git_sysdir_set(git_sysdir_t which, const char *paths);
  
  #endif
  

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