/* spl_dumptree.h 可配置的树形打印模块（只用基本 ASCII）*/

#ifndef __SPL_DUMPTREE_H__
#define __SPL_DUMPTREE_H__

#include <stddef.h>
#include <stdio.h>

/* 可配置的缩进字符串 */
typedef struct {
    const char *vertical;    /* "| "  */
    const char *branch;      /* "|-"  */
    const char *last_branch; /* "`-"  */
    const char *space;       /* "  "  */
} spl_dumptree_style_t;

/* 默认 ASCII 风格 */
extern const spl_dumptree_style_t spl_dumptree_ascii_style;

/* 打印一行节点标签：prefix + 分支符 + label
 * prefix  已累积的缩进骨架（不含分支符）
 * is_last 本节点是否为同级最后一个子节点
 * fmt     printf 风格 label */
void spl_dumptree_print(const spl_dumptree_style_t *st, const char *prefix, int is_last,
                        const char *fmt, ...);

/* 生成子节点的缩进骨架：parent_prefix + (parent_is_last ? space : vertical) */
void spl_dumptree_child_prefix(const spl_dumptree_style_t *st, const char *prefix, int is_last,
                               char *out, size_t cap);

#endif /* __SPL_DUMPTREE_H__ */