}
/*
- * Draw an octopus merge and return the number of characters written.
+ * Draw the horizontal dashes of an octopus merge and return the number of
+ * characters written.
*/
static int graph_draw_octopus_merge(struct git_graph *graph,
struct strbuf *sb)
{
/*
- * Here dashless_commits represents the number of parents
- * which don't need to have dashes (because their edges fit
- * neatly under the commit).
- */
- const int dashless_commits = 2;
- int col_num, i;
- int num_dashes =
- ((graph->num_parents - dashless_commits) * 2) - 1;
- for (i = 0; i < num_dashes; i++) {
- col_num = (i / 2) + dashless_commits + graph->commit_index;
- strbuf_write_column(sb, &graph->new_columns[col_num], '-');
+ * Here dashless_parents represents the number of parents which don't
+ * need to have dashes (the edges labeled "0" and "1"). And
+ * dashful_parents are the remaining ones.
+ *
+ * | *---.
+ * | |\ \ \
+ * | | | | |
+ * x 0 1 2 3
+ *
+ */
+ const int dashless_parents = 2;
+ int dashful_parents = graph->num_parents - dashless_parents;
+
+ /*
+ * Usually, we add one new column for each parent (like the diagram
+ * above) but sometimes the first parent goes into an existing column,
+ * like this:
+ *
+ * | *---.
+ * | |\ \ \
+ * |/ / / /
+ * x 0 1 2
+ *
+ * In which case the number of parents will be one greater than the
+ * number of added columns.
+ */
+ int added_cols = (graph->num_new_columns - graph->num_columns);
+ int parent_in_old_cols = graph->num_parents - added_cols;
+
+ /*
+ * In both cases, commit_index corresponds to the edge labeled "0".
+ */
+ int first_col = graph->commit_index + dashless_parents
+ - parent_in_old_cols;
+
+ int i;
+ for (i = 0; i < dashful_parents; i++) {
+ strbuf_write_column(sb, &graph->new_columns[i+first_col], '-');
+ strbuf_write_column(sb, &graph->new_columns[i+first_col],
+ i == dashful_parents-1 ? '.' : '-');
}
- col_num = (i / 2) + dashless_commits + graph->commit_index;
- strbuf_write_column(sb, &graph->new_columns[col_num], '.');
- return num_dashes + 1;
+ return 2 * dashful_parents;
}
static void graph_output_commit_line(struct git_graph *graph, struct strbuf *sb)