thodg/libgit2/tests-clar/diff/diff_helpers.c

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• Hash : f335ecd6
  Author :
  Date : 2012-08-30T14:24:16
  

  Diff iterators This refactors the diff output code so that an iterator object can be used to traverse and generate the diffs, instead of just the `foreach()` style with callbacks. The code has been rearranged so that the two styles can still share most functions. This also replaces `GIT_REVWALKOVER` with `GIT_ITEROVER` and uses that as a common error code for marking the end of iteration when using a iterator style of object.

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• tests-clar/diff/diff_helpers.c

• #include "clar_libgit2.h"
  #include "diff_helpers.h"
  
  git_tree *resolve_commit_oid_to_tree(
  	git_repository *repo,
  	const char *partial_oid)
  {
  	size_t len = strlen(partial_oid);
  	git_oid oid;
  	git_object *obj = NULL;
  	git_tree *tree = NULL;
  
  	if (git_oid_fromstrn(&oid, partial_oid, len) == 0)
  		git_object_lookup_prefix(&obj, repo, &oid, len, GIT_OBJ_ANY);
  	cl_assert(obj);
  	if (git_object_type(obj) == GIT_OBJ_TREE)
  		return (git_tree *)obj;
  	cl_assert(git_object_type(obj) == GIT_OBJ_COMMIT);
  	cl_git_pass(git_commit_tree(&tree, (git_commit *)obj));
  	git_object_free(obj);
  	return tree;
  }
  
  int diff_file_fn(
  	void *cb_data,
  	git_diff_delta *delta,
  	float progress)
  {
  	diff_expects *e = cb_data;
  
  	GIT_UNUSED(progress);
  
  	if (delta->binary)
  		e->at_least_one_of_them_is_binary = true;
  
  	e->files++;
  	switch (delta->status) {
  	case GIT_DELTA_ADDED: e->file_adds++; break;
  	case GIT_DELTA_DELETED: e->file_dels++; break;
  	case GIT_DELTA_MODIFIED: e->file_mods++; break;
  	case GIT_DELTA_IGNORED: e->file_ignored++; break;
  	case GIT_DELTA_UNTRACKED: e->file_untracked++; break;
  	case GIT_DELTA_UNMODIFIED: e->file_unmodified++; break;
  	default: break;
  	}
  	return 0;
  }
  
  int diff_hunk_fn(
  	void *cb_data,
  	git_diff_delta *delta,
  	git_diff_range *range,
  	const char *header,
  	size_t header_len)
  {
  	diff_expects *e = cb_data;
  
  	GIT_UNUSED(delta);
  	GIT_UNUSED(header);
  	GIT_UNUSED(header_len);
  
  	e->hunks++;
  	e->hunk_old_lines += range->old_lines;
  	e->hunk_new_lines += range->new_lines;
  	return 0;
  }
  
  int diff_line_fn(
  	void *cb_data,
  	git_diff_delta *delta,
  	git_diff_range *range,
  	char line_origin,
  	const char *content,
  	size_t content_len)
  {
  	diff_expects *e = cb_data;
  
  	GIT_UNUSED(delta);
  	GIT_UNUSED(range);
  	GIT_UNUSED(content);
  	GIT_UNUSED(content_len);
  
  	e->lines++;
  	switch (line_origin) {
  	case GIT_DIFF_LINE_CONTEXT:
  		e->line_ctxt++;
  		break;
  	case GIT_DIFF_LINE_ADDITION:
  		e->line_adds++;
  		break;
  	case GIT_DIFF_LINE_ADD_EOFNL:
  		assert(0);
  		break;
  	case GIT_DIFF_LINE_DELETION:
  		e->line_dels++;
  		break;
  	case GIT_DIFF_LINE_DEL_EOFNL:
  		/* technically not a line delete, but we'll count it as such */
  		e->line_dels++;
  		break;
  	default:
  		break;
  	}
  	return 0;
  }
  
  int diff_foreach_via_iterator(
  	git_diff_list *diff,
  	void *data,
  	git_diff_file_fn file_cb,
  	git_diff_hunk_fn hunk_cb,
  	git_diff_data_fn line_cb)
  {
  	int error, curr, total;
  	git_diff_iterator *iter;
  	git_diff_delta *delta;
  
  	if ((error = git_diff_iterator_new(&iter, diff)) < 0)
  		return error;
  
  	curr  = 0;
  	total = git_diff_iterator_num_files(iter);
  
  	while (!(error = git_diff_iterator_next_file(&delta, iter))) {
  		git_diff_range *range;
  		const char *hdr;
  		size_t hdr_len;
  
  		/* call file_cb for this file */
  		if (file_cb != NULL && file_cb(data, delta, (float)curr / total) != 0)
  			goto abort;
  
  		if (!hunk_cb && !line_cb)
  			continue;
  
  		while (!(error = git_diff_iterator_next_hunk(
  				&range, &hdr, &hdr_len, iter))) {
  			char origin;
  			const char *line;
  			size_t line_len;
  
  			if (hunk_cb && hunk_cb(data, delta, range, hdr, hdr_len) != 0)
  				goto abort;
  
  			if (!line_cb)
  				continue;
  
  			while (!(error = git_diff_iterator_next_line(
  				&origin, &line, &line_len, iter))) {
  
  				if (line_cb(data, delta, range, origin, line, line_len) != 0)
  					goto abort;
  			}
  
  			if (error && error != GIT_ITEROVER)
  				goto done;
  		}
  
  		if (error && error != GIT_ITEROVER)
  			goto done;
  	}
  
  done:
  	git_diff_iterator_free(iter);
  
  	if (error == GIT_ITEROVER)
  		error = 0;
  
  	return error;
  
  abort:
  	git_diff_iterator_free(iter);
  	giterr_clear();
  
  	return GIT_EUSER;
  }
  

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