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#include <string.h>
#include <stdio.h>
#include "nav.h"
void nav_init(struct nav_state *ns) {
memset(ns, 0, sizeof *ns);
ns->histc = 1;
doc_init(&ns->histv[0]);
doc_add_text(&ns->histv[0], "Type ? for command help.");
}
void nav_fini(struct nav_state *ns) {
for (size_t i = 0; i < ns->histc; i++) {
doc_fini(&ns->histv[i]);
}
}
size_t pg_lines(void) {
return 24;
}
struct doc_line *nav_cur_line(struct nav_state *ns) {
return (struct doc_line *)&ns->histv[ns->cur_doc].txt.buf[ns->cur_ofs[ns->cur_doc]];
}
int nav_line_up(struct nav_state *ns) {
if (ns->cur_ofs[ns->cur_doc] > 0) {
ns->cur_ofs[ns->cur_doc] -= nav_cur_line(ns)->prev;
return 1;
} else {
return 0;
}
}
int nav_line_down(struct nav_state *ns) {
struct doc_line *l = nav_cur_line(ns);
if (ns->cur_ofs[ns->cur_doc] + sizeof(struct doc_line) + l->len < ns->histv[ns->cur_doc].txt.sz) {
ns->cur_ofs[ns->cur_doc] += l->len + sizeof(struct doc_line);
return 1;
} else {
return 0;
}
}
void nav_pg_up(struct nav_state *ns) {
size_t lines = pg_lines() << 1;
while (lines-- && nav_line_up(ns));
nav_pg_down(ns);
}
void nav_pg_down(struct nav_state *ns) {
size_t lines = pg_lines();
while (lines--) {
struct doc_line *l = nav_cur_line(ns);
fwrite(l->txt, 1, l->len, stdout);
putchar('\n');
if (!nav_line_down(ns)) break;
}
}
void nav_redraw(struct nav_state *ns) {
}
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