thodg/libgit2/src/filter.h

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• Hash : 9587895f
  Author :
  Date : 2012-07-16T12:06:23
  

  Migrate code to git_filter_blob_contents. Also removes the unnecessary check for filter length, since git_filters_apply does the right thing when there are none, and it's more efficient than this.

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• src/filter.h

• /*
   * Copyright (C) 2009-2012 the libgit2 contributors
   *
   * 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_filter_h__
  #define INCLUDE_filter_h__
  
  #include "common.h"
  #include "buffer.h"
  #include "git2/odb.h"
  #include "git2/repository.h"
  
  typedef struct git_filter {
  	int (*apply)(struct git_filter *self, git_buf *dest, const git_buf *source);
  	void (*do_free)(struct git_filter *self);
  } git_filter;
  
  typedef enum {
  	GIT_FILTER_TO_WORKTREE,
  	GIT_FILTER_TO_ODB
  } git_filter_mode;
  
  typedef enum {
  	GIT_CRLF_GUESS = -1,
  	GIT_CRLF_BINARY = 0,
  	GIT_CRLF_TEXT,
  	GIT_CRLF_INPUT,
  	GIT_CRLF_CRLF,
  	GIT_CRLF_AUTO,
  } git_crlf_t;
  
  typedef struct {
  	/* NUL, CR, LF and CRLF counts */
  	unsigned int nul, cr, lf, crlf;
  
  	/* These are just approximations! */
  	unsigned int printable, nonprintable;
  } git_text_stats;
  
  /*
   * FILTER API
   */
  
  /*
   * For any given path in the working directory, fill the `filters`
   * array with the relevant filters that need to be applied.
   *
   * Mode is either `GIT_FILTER_TO_WORKTREE` if you need to load the
   * filters that will be used when checking out a file to the working
   * directory, or `GIT_FILTER_TO_ODB` for the filters used when writing
   * a file to the ODB.
   *
   * @param filters Vector where to store all the loaded filters
   * @param repo Repository object that contains `path`
   * @param path Relative path of the file to be filtered
   * @param mode Filtering direction (WT->ODB or ODB->WT)
   * @return the number of filters loaded for the file (0 if the file
   *	doesn't need filtering), or a negative error code
   */
  extern int git_filters_load(git_vector *filters, git_repository *repo, const char *path, int mode);
  
  /*
   * Apply one or more filters to a file.
   *
   * The file must have been loaded as a `git_buf` object. Both the `source`
   * and `dest` buffers are owned by the caller and must be freed once
   * they are no longer needed.
   *
   * NOTE: Because of the double-buffering schema, the `source` buffer that contains
   * the original file may be tampered once the filtering is complete. Regardless, 
   * the `dest` buffer will always contain the final result of the filtering
   *
   * @param dest Buffer to store the result of the filtering
   * @param source Buffer containing the document to filter
   * @param filters A non-empty vector of filters as supplied by `git_filters_load`
   * @return 0 on success, an error code otherwise
   */
  extern int git_filters_apply(git_buf *dest, git_buf *source, git_vector *filters);
  
  /*
   * Free the `filters` array generated by `git_filters_load`.
   *
   * Note that this frees both the array and its contents. The array will
   * be clean/reusable after this call.
   *
   * @param filters A filters array as supplied by `git_filters_load`
   */
  extern void git_filters_free(git_vector *filters);
  
  /*
   * Available filters
   */
  
  /* Strip CRLF, from Worktree to ODB */
  extern int git_filter_add__crlf_to_odb(git_vector *filters, git_repository *repo, const char *path);
  
  /* Add CRLF, from ODB to worktree */
  extern int git_filter_add__crlf_to_workdir(git_vector *filters, git_repository *repo, const char *path);
  
  
  /*
   * PLAINTEXT API
   */
  
  /*
   * Gather stats for a piece of text
   *
   * Fill the `stats` structure with information on the number of
   * unreadable characters, carriage returns, etc, so it can be
   * used in heuristics.
   */
  extern void git_text_gather_stats(git_text_stats *stats, const git_buf *text);
  
  /*
   * Process `git_text_stats` data generated by `git_text_stat` to see
   * if it qualifies as a binary file
   */
  extern int git_text_is_binary(git_text_stats *stats);
  
  
  /**
   * Get the content of a blob after all filters have been run.
   *
   * @param out buffer to receive the contents
   * @param repo repository containing the blob
   * @param oid object id for the blob
   * @param path path to the blob's output file, relative to the workdir root
   * @return 0 on success, an error code otherwise
   */
  extern int git_filter_blob_contents(git_buf *out, git_repository *repo, const git_oid *oid, const char *path);
  
  #endif
  

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