thodg/libgit2/tests/filter/file.c

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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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• tests/filter/file.c

• #include "clar_libgit2.h"
  #include "git2/sys/filter.h"
  #include "crlf.h"
  
  static git_repository *g_repo = NULL;
  
  void test_filter_file__initialize(void)
  {
  	git_reference *head_ref;
  	git_commit *head;
  
  	g_repo = cl_git_sandbox_init("crlf");
  
  	cl_git_mkfile("crlf/.gitattributes",
  		"*.txt text\n*.bin binary\n*.crlf text eol=crlf\n*.lf text eol=lf\n");
  
  	cl_repo_set_bool(g_repo, "core.autocrlf", true);
  
  	cl_git_pass(git_repository_head(&head_ref, g_repo));
  	cl_git_pass(git_reference_peel((git_object **)&head, head_ref, GIT_OBJECT_COMMIT));
  	cl_git_pass(git_reset(g_repo, (git_object *)head, GIT_RESET_HARD, NULL));
  
  	git_commit_free(head);
  	git_reference_free(head_ref);
  }
  
  void test_filter_file__cleanup(void)
  {
  	cl_git_sandbox_cleanup();
  }
  
  void test_filter_file__apply(void)
  {
  	git_filter_list *fl;
  	git_filter *crlf;
  	git_buf buf = GIT_BUF_INIT;
  
  	cl_git_pass(git_filter_list_new(
  		&fl, g_repo, GIT_FILTER_TO_ODB, 0));
  
  	crlf = git_filter_lookup(GIT_FILTER_CRLF);
  	cl_assert(crlf != NULL);
  
  	cl_git_pass(git_filter_list_push(fl, crlf, NULL));
  
  	cl_git_pass(git_filter_list_apply_to_file(&buf, fl, g_repo, "all-crlf"));
  	cl_assert_equal_s("crlf\ncrlf\ncrlf\ncrlf\n", buf.ptr);
  
  	git_buf_dispose(&buf);
  	git_filter_list_free(fl);
  }
  
  struct buf_writestream {
  	git_writestream base;
  	git_str buf;
  };
  
  int buf_writestream_write(git_writestream *s, const char *buf, size_t len)
  {
  	struct buf_writestream *stream = (struct buf_writestream *)s;
  	return git_str_put(&stream->buf, buf, len);
  }
  
  int buf_writestream_close(git_writestream *s)
  {
  	GIT_UNUSED(s);
  	return 0;
  }
  
  void buf_writestream_free(git_writestream *s)
  {
  	struct buf_writestream *stream = (struct buf_writestream *)s;
  	git_str_dispose(&stream->buf);
  }
  
  void test_filter_file__apply_stream(void)
  {
  	git_filter_list *fl;
  	git_filter *crlf;
  	struct buf_writestream write_target = { {
  		buf_writestream_write,
  		buf_writestream_close,
  		buf_writestream_free } };
  
  	cl_git_pass(git_filter_list_new(
  		&fl, g_repo, GIT_FILTER_TO_ODB, 0));
  
  	crlf = git_filter_lookup(GIT_FILTER_CRLF);
  	cl_assert(crlf != NULL);
  
  	cl_git_pass(git_filter_list_push(fl, crlf, NULL));
  
  	cl_git_pass(git_filter_list_stream_file(fl, g_repo, "all-crlf", &write_target.base));
  	cl_assert_equal_s("crlf\ncrlf\ncrlf\ncrlf\n", write_target.buf.ptr);
  
  	git_filter_list_free(fl);
  	write_target.base.free(&write_target.base);
  }
  

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