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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "os.h"
#include "export.h"
static int txt_open(struct export *e);
static int txt_option(struct export *e, int opt, char *arg);
static int txt_output(struct export *e, char *name, struct fmt_page *pg);
static char *txt_opts[] = // module options
{
"color", // generate ansi color codes (and attributes)
"gfx-chr=<char>", // substitute <char> for gfx-symbols
"fg=<0-7|none>", // assume term has <x> as foreground color
"bg=<0-7|none>", // assume term has <x> as background color
"lines=<1-25>", // output 24 or 25 lines
0
};
struct txt_data // private data in struct export
{
u8 color;
u8 gfx_chr;
u8 def_fg;
u8 def_bg;
int endline;
struct fmt_char curr[1];
FILE *fp;
};
struct export_module export_txt = // exported module definition
{
"ascii", // id
"txt", // extension
txt_opts, // options
sizeof(struct txt_data), // data size
txt_open, // open
0, // close
txt_option, // option
txt_output, // output
};
struct export_module export_ansi = // exported module definition
{
"ansi", // id
"txt", // extension
txt_opts, // options
sizeof(struct txt_data), // data size
txt_open, // open
0, // close
txt_option, // option
txt_output, // output
};
#define D ((struct txt_data *)e->data)
char * my_stpcpy(char *dst, const char *src)
{
while (*dst = *src++)
dst++;
return dst;
}
static int txt_open(struct export *e)
{
D->gfx_chr = '#';
D->def_fg = -1;
D->def_bg = -1;
D->endline = H;
if (e->mod == &export_ansi)
D->color = 1;
return 0;
}
static int txt_option(struct export *e, int opt, char *arg)
{
switch (opt)
{
case 1: // color
D->color = 1;
break;
case 2: // gfx-chr=
D->gfx_chr = *arg ?: ' ';
break;
case 3: // fg=
D->def_fg = *arg - '0';
break;
case 4: // bg=
D->def_bg = *arg - '0';
break;
case 5: // lines=
D->endline = atoi(arg);
if (D->endline < 1 || D->endline > H)
{
export_error("lines: invalid number");
return 1;
}
}
return 0;
}
static void put_attr(struct export *e, struct fmt_char *new)
{
char buf[512];
char *p = buf;
int fg, bg, attr;
int reset = 0;
if (D->color)
{
fg = D->curr->fg ^ new->fg;
bg = D->curr->bg ^ new->bg;
attr = (D->curr->attr ^ new->attr) & (EA_BLINK | EA_DOUBLE);
if (fg | bg | attr)
{
if (~new->attr & attr) // reset some attributes -> reset all.
reset = 1;
if (fg && new->fg == D->def_fg) // switch to def fg -> reset all
reset = 1;
if (bg && new->bg == D->def_bg) // switch to def bg -> reset all
reset = 1;
p = my_stpcpy(buf, "\e[");
if (reset)
{
p = my_stpcpy(p, ";"); // "0;" but 0 isn't neccesary
attr = -1; // set all attributes
fg = new->fg ^ D->def_fg; // set fg if != default fg
bg = new->bg ^ D->def_bg; // set bg if != default bg
}
if (attr & new->attr & EA_BLINK)
p = my_stpcpy(p, "5;"); // blink
if (attr & new->attr & EA_DOUBLE)
p = my_stpcpy(p, "1;"); // bold
if (fg)
p += sprintf(p, "%d;", new->fg + 30); // fg-color
if (bg)
p += sprintf(p, "%d;", new->bg + 40); // bg-color
p[-1] = 'm'; // replace last ;
*D->curr = *new;
}
}
*p++ = new->ch;
*p = 0;
fputs(buf, D->fp);
}
static int txt_output(struct export *e, char *name, struct fmt_page *pg)
{
struct fmt_char def_c[1];
struct fmt_char l[W+2];
#define L (l+1)
int x, y;
D->fp = fopen(name, "w");
if (not D->fp)
{
export_error("cannot create file");
return -1;
}
/* initialize default colors. These have to be restored at EOL. */
def_c->ch = '\n';
def_c->fg = D->def_fg;
def_c->bg = D->def_bg;
def_c->attr = E_DEF_ATTR;
*D->curr = *def_c;
L[-1] = L[W] = *def_c;
for (y = 0; y < D->endline; y++)
if (~pg->hid & (1 << y)) // not hidden
{
// character conversion
for (x = 0; x < W; ++x)
{
struct fmt_char c = pg->data[y][x];
switch (c.ch)
{
case 0x00: case 0xa0: c.ch = ' '; break;
case 0x7f: c.ch = '*'; break;
case BAD_CHAR: c.ch = '?'; break;
default:
if (c.attr & EA_GRAPHIC)
c.ch = D->gfx_chr;
break;
}
L[x] = c;
}
if (D->color)
{
// optimize color and attribute changes
// delay fg and attr changes as far as possible
for (x = 0; x < W; ++x)
if (L[x].ch == ' ')
{
L[x].fg = L[x-1].fg;
l[x].attr = L[x-1].attr;
}
// move fg and attr changes to prev bg change point
for (x = W-1; x >= 0; x--)
if (L[x].ch == ' ' && L[x].bg == L[x+1].bg)
{
L[x].fg = L[x+1].fg;
L[x].attr = L[x+1].attr;
}
}
// now emit the whole line (incl EOL)
for (x = 0; x < W+1; ++x)
put_attr(e, L + x);
}
fclose(D->fp);
return 0;
}
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