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/*
* blogc: A blog compiler.
* Copyright (C) 2014-2020 Rafael G. Martins <rafael@rafaelmartins.eng.br>
*
* This program can be distributed under the terms of the BSD License.
* See the file LICENSE.
*/
#include <stdlib.h>
#include "../common/utils.h"
#include "toctree.h"
bc_slist_t*
blogc_toctree_append(bc_slist_t *headers, size_t level, const char *slug, const char *text)
{
if (level == 0)
return headers;
blogc_toctree_header_t *t = bc_malloc(sizeof(blogc_toctree_header_t));
t->level = level;
t->slug = bc_strdup(slug);
t->text = bc_strdup(text);
return bc_slist_append(headers, t);
}
char*
blogc_toctree_render(bc_slist_t *headers, int maxdepth, const char *endl)
{
if (headers == NULL || maxdepth == 0)
return NULL;
// find lower level
size_t lower_level = 0;
for (bc_slist_t *l = headers; l != NULL; l = l->next) {
size_t lv = ((blogc_toctree_header_t*) l->data)->level;
if (lower_level == 0 || lower_level > lv) {
lower_level = lv;
}
}
if (lower_level == 0)
return NULL;
// render
bc_string_t *rv = bc_string_new();
bc_string_append_printf(rv, "<ul>%s", endl == NULL ? "\n" : endl);
size_t spacing = 4;
size_t current_level = lower_level;
for (bc_slist_t *l = headers; l != NULL; l = l->next) {
blogc_toctree_header_t *t = l->data;
if (t->level - lower_level >= maxdepth) {
continue;
}
while (current_level > t->level) {
spacing -= 4;
bc_string_append_printf(rv, "%*s</ul>%s", spacing, "",
endl == NULL ? "\n" : endl);
current_level--;
}
while (current_level < t->level) {
bc_string_append_printf(rv, "%*s<ul>%s", spacing, "",
endl == NULL ? "\n" : endl);
current_level++;
spacing += 4;
}
bc_string_append_printf(rv, "%*s<li>", spacing, "");
if (t->slug != NULL) {
bc_string_append_printf(rv, "<a href=\"#%s\">%s</a>", t->slug,
t->text != NULL ? t->text : "");
}
else {
bc_string_append(rv, t->text);
}
bc_string_append_printf(rv, "</li>%s", endl == NULL ? "\n" : endl);
}
// close leftovers
while (current_level >= lower_level) {
spacing -= 4;
bc_string_append_printf(rv, "%*s</ul>%s", spacing, "",
endl == NULL ? "\n" : endl);
current_level--;
}
return bc_string_free(rv, false);
}
static void
free_header(blogc_toctree_header_t *h)
{
free(h->slug);
free(h->text);
free(h);
}
void
blogc_toctree_free(bc_slist_t *l)
{
bc_slist_free_full(l, (bc_free_func_t) free_header);
}
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