Function graph_next_line

graph.c:1439–1478

}

int graph_next_line(struct git_graph *graph, struct strbuf *sb)
{
	int shown_commit_line = 0;
	struct graph_line line = { .buf = sb, .width = 0 };

	/*
	 * We could conceivable be called with a NULL commit
	 * if our caller has a bug, and invokes graph_next_line()
	 * immediately after graph_init(), without first calling
	 * graph_update().  Return without outputting anything in this
	 * case.
	 */
	if (!graph->commit)
		return -1;

	switch (graph->state) {
	case GRAPH_PADDING:
		graph_output_padding_line(graph, &line);
		break;
	case GRAPH_SKIP:
		graph_output_skip_line(graph, &line);
		break;
	case GRAPH_PRE_COMMIT:
		graph_output_pre_commit_line(graph, &line);
		break;
	case GRAPH_COMMIT:
		graph_output_commit_line(graph, &line);
		shown_commit_line = 1;
		break;
	case GRAPH_POST_MERGE:
		graph_output_post_merge_line(graph, &line);
		break;
	case GRAPH_COLLAPSING:
		graph_output_collapsing_line(graph, &line);
		break;
	}

	graph_pad_horizontally(graph, &line);
	return shown_commit_line;
}

static void graph_padding_line(struct git_graph *graph, struct strbuf *sb)
{