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@starius

starius/boxshell.c

Created Mar 27, 2015
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What would you like to do?
simple example program that creates a terminal in a frame
/* Just a simple example program that creates a terminal in a frame
* and lets the user interact with it.
*
* To compile:
* gcc -o boxshell boxshell.c $(rote-config --cflags --libs)
*/
#include <ncurses.h>
#include <stdio.h>
#include <rote/rote.h>
#include <signal.h>
static unsigned char getout = 0;
void sigchld(int signo) { getout = 1; }
int my_custom_handler(RoteTerm *rt, const char *es);
int screen_w, screen_h;
WINDOW *term_win;
int main() {
RoteTerm *rt;
int i, j, ch;
signal(SIGCHLD, sigchld);
initscr();
noecho();
start_color();
raw();
nodelay(stdscr, TRUE); /* prevents getch() from blocking; rather
* it will return ERR when there is no
* keypress available */
keypad(stdscr, TRUE); /* necessary to use rote_vt_keypress */
getmaxyx(stdscr, screen_h, screen_w);
/* initialize the color pairs the way rote_vt_draw expects it. You might
* initialize them differently, but in that case you would need
* to supply a custom conversion function for rote_vt_draw to
* call when setting attributes. The idea of this "default" mapping
* is to map (fg,bg) to the color pair bg * 8 + 7 - fg. This way,
* the pair (white,black) ends up mapped to 0, which means that
* it does not need a color pair (since it is the default). Since
* there are only 63 available color pairs (and 64 possible fg/bg
* combinations), we really have to save 1 pair by assigning no pair
* to the combination white/black. */
for (i = 0; i < 8; i++) for (j = 0; j < 8; j++)
if (i != 7 || j != 0)
init_pair(j*8+7-i, i, j);
/* paint the screen blue */
attrset(COLOR_PAIR(32));
for (i = 0; i < screen_h; i++) for (j = 0; j < screen_w; j++) addch(' ');
refresh();
/* create a window with a frame */
term_win = newwin(22,72,1,4);
wattrset(term_win, COLOR_PAIR(7*8+7-0)); /* black over white */
wborder(term_win, 0, 0, 0, 0, 0, 0, 0, 0);
mvwprintw(term_win, 0, 27, " Term In a Box ");
wrefresh(term_win);
/* create the terminal and have it run bash */
rt = rote_vt_create(20, 70);
rote_vt_forkpty(rt, "/bin/bash --login");
/* add a sample custom escape sequence handler... say we want to handle
* the sequence, say, \e{N}, which will change the application's background
* color to N (where N is a number between 0 and 7). */
rote_vt_install_handler(rt, my_custom_handler);
/* keep reading keypresses from the user and passing them to the terminal;
* also, redraw the terminal to the window at each iteration */
ch = '\0';
while (!getout) {
rote_vt_draw(rt, term_win, 1, 1, NULL);
wrefresh(term_win);
ch = getch();
if (ch != ERR)
rote_vt_keypress(rt, ch); /* pass the keypress for handling */
}
endwin();
return 0;
}
int my_custom_handler(RoteTerm *rt, const char *es) {
int color;
int i, j;
/* if the escape sequence does not begin with '{', we give up */
if (*es != '{') return ROTE_HANDLERESULT_NOWAY;
/* ok, now we know it begins with '{'. Now, if it does not end with '}',
* it is not yet complete */
if (es[strlen(es)-1] != '}') return ROTE_HANDLERESULT_NOTYET;
/* ok, the sequence is complete */
color = atoi(es + 1);
if (color < 0 || color > 7) return false; /* don't recognize it */
/* paint the background with that color */
attrset(COLOR_PAIR(color * 8));
move(0, 0);
for (i = 0; i < screen_h; i++) for (j = 0; j < screen_w; j++) addch(' ');
touchwin(stdscr);
refresh();
/* touch term_win to force it to do a full redraw next time */
touchwin(term_win);
/* and redraw the terminal window */
wrefresh(term_win);
/* escape sequence was handled ok */
return ROTE_HANDLERESULT_OK;
}
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