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#include <string.h>
#include <stdio.h>
#include "nav.h"
#include "net.h"
#include "err.h"
#include "parse.h"
/* history */
void nav_init(struct nav_state *ns) {
memset(ns, 0, sizeof *ns);
ns->histc = 1;
doc_init(ns->histv);
doc_add_text(ns->histv, "Type ? for command help.");
ns->prot_default = PROT_FILE; /* change to PROT_GOPHER later */
}
void nav_fini(struct nav_state *ns) {
for (size_t i = 0; i < ns->histc; i++) {
doc_fini(&ns->histv[i]);
}
}
void nav_push(struct nav_state *ns, struct doc d) {
while (ns->histc > ns->cur_doc + 1) {
doc_fini(&ns->histv[--ns->histc]);
}
if (ns->histc == HIST_MAX) {
doc_fini(ns->histv);
memmove(ns->histv, &ns->histv[1], sizeof(struct doc) * (HIST_MAX - 1));
memmove(ns->cur_ofs, &ns->cur_ofs[1], sizeof(size_t) * (HIST_MAX - 1));
ns->histc--;
}
ns->cur_ofs[ns->histc] = 0;
ns->histv[ns->histc++] = d;
ns->cur_doc = ns->histc - 1;
}
void nav_prev(struct nav_state *ns) {
if (ns->cur_doc > 0) ns->cur_doc--;
nav_redraw(ns);
}
void nav_next(struct nav_state *ns) {
if (ns->cur_doc + 1 < ns->histc) ns->cur_doc++;
nav_redraw(ns);
}
/* paging */
size_t pg_lines(void) {
return 24;
}
struct doc_line *nav_cur_line(struct nav_state *ns) {
return doc_line_at(&ns->histv[ns->cur_doc], ns->cur_ofs[ns->cur_doc]);
}
int nav_line_up(struct nav_state *ns) {
return !doc_line_prev(&ns->histv[ns->cur_doc], &ns->cur_ofs[ns->cur_doc]);
}
int nav_line_down(struct nav_state *ns) {
return !doc_line_next(&ns->histv[ns->cur_doc], &ns->cur_ofs[ns->cur_doc]);
}
void nav_pg_up(struct nav_state *ns) {
size_t lines = pg_lines() << 1;
while (lines-- && nav_line_up(ns));
nav_pg_down(ns);
}
#define MARGIN 8
void nav_pg_down(struct nav_state *ns) {
size_t lines = pg_lines();
while (lines--) {
struct doc_line *l = nav_cur_line(ns);
int n = 0;
if (l->link != DOC_LINK_NONE) {
n = printf("[%hu]", l->link + 1);
}
while (n++ < MARGIN) putchar(' ');
fwrite(l->txt, 1, l->len, stdout);
putchar('\n');
if (!nav_line_down(ns)) break;
}
}
void nav_redraw(struct nav_state *ns) {
size_t lines = pg_lines();
while (lines-- && nav_line_up(ns));
nav_pg_down(ns);
}
/* network */
int nav_to(struct nav_state *ns, const char *url) {
enum doc_type doct;
struct addr adr;
buf_t buf;
if (net_addr(url, &adr, ns->prot_default)) {
return -1;
}
ns->prot_default = adr.prot;
if (net_fetch(&adr, &buf, &doct)) {
return -1;
}
struct doc d;
if (parse_doc(doct, &d, &buf)) {
buf_free(&buf);
return -1;
}
nav_push(ns, d);
buf_free(&buf);
nav_redraw(ns);
return 0;
}
int nav_link_nr(struct nav_state *ns, unsigned long link_nr) {
struct doc *d = &ns->histv[ns->cur_doc];
const char *url = doc_get_link(d, link_nr);
if (url) {
puts(url);
return nav_to(ns, url);
} else {
perr("invalid link number");
}
return 0;
}
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