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/* */
#include <dos.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include "mdr\cout.h"
#include "mdr\keyb.h"
#include "svarlang\svarlang.h"
#define COL_TXT 0
#define COL_STATUSBAR1 1
#define COL_STATUSBAR2 2
#define COL_SCROLLBAR 3
/* preload the mono scheme (to be overloaded at runtime if color adapter present) */
static unsigned char scheme[] = {0x07, 0x70, 0x70, 0x70};
#define SCROLL_CURSOR 0xB1
struct line {
struct line *prev;
struct line *next;
unsigned short len;
char payload[1];
};
struct linedb {
struct line *topscreen;
struct line *cursor;
unsigned short xoffset;
};
void line_add(struct linedb *db, const char *line) {
unsigned short slen = strlen(line);
struct line *l;
/* trim out CR/LF line endings */
if ((slen >= 2) && (line[slen - 2] == '\r')) {
slen -= 2;
} else if ((slen >= 1) && (line[slen - 1] == '\n')) {
slen--;
}
l = calloc(1, sizeof(struct line) + slen + 1);
l->prev = db->cursor;
if (db->cursor) {
l->next = db->cursor->next;
db->cursor->next = l;
l->next->prev = l;
}
db->cursor = l;
memcpy(l->payload, line, slen);
l->len = slen;
}
void db_rewind(struct linedb *db) {
if (db->cursor == NULL) return;
while (db->cursor->prev) db->cursor = db->cursor->prev;
db->topscreen = db->cursor;
}
void load_colorscheme(void) {
scheme[COL_TXT] = 0x17;
scheme[COL_STATUSBAR1] = 0x70;
scheme[COL_STATUSBAR2] = 0x78;
scheme[COL_SCROLLBAR] = 0x70;
}
static void ui_basic(unsigned char screenw, unsigned char screenh, const char *fname) {
unsigned char i;
const char *s = "HELP";
unsigned char helpcol = screenw - (strlen(s) + 4);
/* clear screen */
mdr_cout_cls(scheme[COL_TXT]);
/* status bar */
for (i = 0; i < helpcol; i++) {
mdr_cout_char(screenh - 1, i, *fname, scheme[COL_STATUSBAR1]);
if (*fname != 0) fname++;
}
mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);
mdr_cout_str(screenh - 1, helpcol + 4, s, scheme[COL_STATUSBAR2], 40);
/* scroll bar */
for (i = 0; i < (screenh - 1); i++) {
mdr_cout_char(i, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);
}
}
static void ui_refresh(const struct linedb *db, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto) {
unsigned char y = 0;
unsigned char len;
struct line *l;
/* DEBUG TODO FIXME */
static char m = 'a';
m++;
if (m > 'z') m = 'a';
for (l = db->topscreen; l != NULL; l = l->next) {
/* skip lines that do not to be refreshed */
if ((y < uidirtyfrom) || (y > uidirtyto)) continue;
if (db->xoffset < l->len) {
len = mdr_cout_str(y, 0, l->payload + db->xoffset, scheme[COL_TXT], screenw - 1);
} else {
len = 0;
}
while (len < screenw - 1) mdr_cout_char(y, len++, ' ', scheme[COL_TXT]);
/* FIXME DEBUG */
mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);
if (y == screenh - 2) break;
y++;
}
}
static void check_cursor_not_after_eol(struct linedb *db, unsigned char *cursorpos, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
if (db->xoffset + *cursorpos <= db->cursor->len) return;
if (db->cursor->len < db->xoffset) {
*cursorpos = 0;
db->xoffset = db->cursor->len;
*uidirtyfrom = 0;
*uidirtyto = 0xff;
} else {
*cursorpos = db->cursor->len - db->xoffset;
}
}
static void cursor_up(struct linedb *db, unsigned char *cursorposy, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
if (db->cursor->prev != NULL) {
db->cursor = db->cursor->prev;
if (*cursorposy == 0) {
db->topscreen = db->cursor;
*uidirtyfrom = 0;
*uidirtyto = 0xff;
} else {
*cursorposy -= 1;
}
}
}
static void cursor_eol(struct linedb *db, unsigned char *cursorposx, unsigned char screenw, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
/* adjust xoffset to make sure eol is visible on screen */
if (db->xoffset > db->cursor->len) {
db->xoffset = db->cursor->len - 1;
*uidirtyfrom = 0;
*uidirtyto = 0xff;
}
if (db->xoffset + screenw - 1 <= db->cursor->len) {
db->xoffset = db->cursor->len - screenw + 2;
*uidirtyfrom = 0;
*uidirtyto = 0xff;
}
*cursorposx = db->cursor->len - db->xoffset;
}
static void cursor_down(struct linedb *db, unsigned char *cursorposy, unsigned char screenh, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
if (db->cursor->next != NULL) {
db->cursor = db->cursor->next;
if (*cursorposy < screenh - 2) {
*cursorposy += 1;
} else {
db->topscreen = db->topscreen->next;
*uidirtyfrom = 0;
*uidirtyto = 0xff;
}
}
}
static void cursor_home(struct linedb *db, unsigned char *cursorposx, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
*cursorposx = 0;
if (db->xoffset != 0) {
db->xoffset = 0;
*uidirtyfrom = 0;
*uidirtyto = 0xff;
}
}
int main(int argc, char **argv) {
int fd;
const char *fname = NULL;
char buff[1024];
struct linedb db;
unsigned char screenw = 0, screenh = 0;
unsigned char cursorposx = 0, cursorposy = 0;
unsigned char uidirtyfrom = 0, uidirtyto = 0xff; /* make sure to redraw entire UI at first run */
bzero(&db, sizeof(db));
svarlang_autoload_nlspath("sved");
if ((argc != 2) || (argv[1][0] == '/')) {
mdr_coutraw_puts("usage: sved file.txt");
return(0);
}
fname = argv[1];
mdr_coutraw_puts("");
if (_dos_open(fname, O_RDONLY, &fd) != 0) {
mdr_coutraw_puts("Failed to open file:");
mdr_coutraw_puts(fname);
return(1);
}
/* load file */
{
unsigned int prevlen = 0, len, llen;
do {
if (_dos_read(fd, buff + prevlen, sizeof(buff) - prevlen, &len) != 0) break;
len += prevlen;
/* look for nearest \n and replace with 0*/
for (llen = 0; buff[llen] != '\n'; llen++) {
if (llen == sizeof(buff)) break;
}
buff[llen] = 0;
if ((llen > 0) && (buff[llen - 1])) buff[llen - 1] = 0; /* trim \r if line ending is cr/lf */
line_add(&db, buff);
len -= llen + 1;
memmove(buff, buff + llen + 1, len);
prevlen = len;
} while (len > 0);
}
/* add an empty line at end if not present already */
if (db.cursor->len != 0) line_add(&db, "");
_dos_close(fd);
if (mdr_cout_init(&screenw, &screenh)) load_colorscheme();
ui_basic(screenw, screenh, fname);
db_rewind(&db);
for (;;) {
int k;
check_cursor_not_after_eol(&db, &cursorposx, &uidirtyfrom, &uidirtyto);
mdr_cout_locate(cursorposy, cursorposx);
if (uidirtyfrom != 0xff) {
ui_refresh(&db, screenw, screenh, uidirtyfrom, uidirtyto);
uidirtyfrom = 0xff;
}
k = keyb_getkey();
if (k == 0x150) { /* down */
cursor_down(&db, &cursorposy, screenh, &uidirtyfrom, &uidirtyto);
} else if (k == 0x148) { /* up */
cursor_up(&db, &cursorposy, &uidirtyfrom, &uidirtyto);
} else if (k == 0x14D) { /* right */
if (db.cursor->len > db.xoffset + cursorposx) {
if (cursorposx < screenw - 2) {
cursorposx++;
} else {
db.xoffset++;
uidirtyfrom = 0;
uidirtyto = 0xff;
}
} else {
cursor_down(&db, &cursorposy, screenh, &uidirtyfrom, &uidirtyto);
cursor_home(&db, &cursorposx, &uidirtyfrom, &uidirtyto);
}
} else if (k == 0x14B) { /* left */
if (cursorposx > 0) {
cursorposx--;
} else if (db.xoffset > 0) {
db.xoffset--;
uidirtyfrom = 0;
uidirtyto = 0xff;
} else if (db.cursor->prev != NULL) { /* jump to end of line above */
cursor_up(&db, &cursorposy, &uidirtyfrom, &uidirtyto);
cursor_eol(&db, &cursorposx, screenw, &uidirtyfrom, &uidirtyto);
}
} else if (k == 0x149) { /* pgup */
// TODO
} else if (k == 0x151) { /* pgdown */
// TODO
} else if (k == 0x147) { /* home */
cursor_home(&db, &cursorposx, &uidirtyfrom, &uidirtyto);
} else if (k == 0x14F) { /* end */
cursor_eol(&db, &cursorposx, screenw, &uidirtyfrom, &uidirtyto);
} else if (k == 0x1B) { /* ESC */
break;
} else { /* UNHANDLED KEY - TODO IGNORE THIS IN PRODUCTION RELEASE */
char buff[4];
const char *HEX = "0123456789ABCDEF";
buff[0] = HEX[(k >> 8) & 15];
buff[1] = HEX[(k >> 4) & 15];
buff[2] = HEX[k & 15];
mdr_cout_str(screenh - 1, 0, "UNHANDLED KEY: 0x", scheme[COL_STATUSBAR1], 17);
mdr_cout_str(screenh - 1, 17, buff, scheme[COL_STATUSBAR1], 3);
keyb_getkey();
break;
}
}
mdr_cout_close();
/* TODO free memory */
return(0);
}