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#include <stdio.h>
#include <ctype.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include "doc.h"
#include "net.h"
#include "err.h"
/* pagination */
size_t pg_lines() {
return 24;
}
void pg_down(void) {
size_t lines = pg_lines();
while (lines--) doc_print_line();
}
void pg_up(void) {
size_t lines = pg_lines() << 1;
while (lines--) doc_back_line();
pg_down();
}
void pg_redraw(void) {
size_t lines = pg_lines();
while (lines--) doc_back_line();
pg_down();
}
/* navigation */
int nav_to(const char *url) {
struct addr a;
static enum protocol prot_default = PROT_FILE; /* change to gopher later */
if (net_addr(url, &a, prot_default)) {
return -1;
}
prot_default = a.prot;
return 0;
}
int nav_link_nr(unsigned long link_nr) {
return 0;
}
/* commands */
struct cmd {
char ch;
int (*fn)(const char *);
};
/* cmd is mutated when trimming strings
* returns whether to quit */
int cmd_do(char *cmd) {
switch (*cmd) {
case 'q':
puts("goodbye!");
return 1;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
{
errno = 0;
unsigned long n = strtoul(cmd, NULL, 10);
if (errno) {
perr("invalid link number");
} else if (nav_link_nr(n)) {
perr("navigation failure");
}
}
break;
case 'b':
pg_up();
break;
case '\0':
pg_down();
break;
case 'r':
pg_redraw();
break;
case 'g':
if (nav_to(cmd + 1)) perr("navigation failure");
break;
default:
perr("?");
break;
}
return 0;
}
void cmd_trim(char *buf, size_t max) {
size_t n = strlen(buf);
while (n > 0 && isspace(buf[n - 1])) {
buf[--n] = 0;
}
while (n > 1 && isspace(buf[1])) {
memmove(&buf[0], &buf[1], n--);
}
}
int cmd_get(char *buf, size_t n) {
fputs("* ", stdout);
return !!fgets(buf, n, stdin);
}
void init(void) {
doc_init();
}
void fini(void) {
doc_fini();
}
int main(void) {
char cmd_buf[1024];
init();
atexit(fini);
while (cmd_get(cmd_buf, sizeof cmd_buf)) {
cmd_trim(cmd_buf, sizeof cmd_buf);
if (cmd_do(cmd_buf)) {
break;
}
}
return 0;
}
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