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/*

 * Nano-X terminal emulator

 *

 * Al Riddoch

 * Greg Haerr

 */

#include <stdio.h>

#include <stdlib.h>

#include <fcntl.h>

#include <unistd.h>

#include <errno.h>

#include <signal.h>

#define MWINCLUDECOLORS

#include "nano-X.h"

#define HAVEBLIT 0              /* set if have bitblit (experimental)*/

#define _       ((unsigned) 0)          /* off bits */

#define X       ((unsigned) 1)          /* on bits */

#define MASK(a,b,c,d,e,f,g) \

        (((((((((((((a * 2) + b) * 2) + c) * 2) + d) * 2) \

        + e) * 2) + f) * 2) + g) << 9)

#if DOS_DJGPP

#define SIGCHLD         17 /* from Linux */

#endif

static GR_WINDOW_ID     w1;     /* id for window */

static GR_GC_ID         gc1;    /* graphics context */

static GR_GC_ID         gc3;    /* graphics context */

static GR_COORD         xpos;   /* x coord for text */

static GR_COORD         ypos;   /* y coord for text */

static GR_SCREEN_INFO   si;     /* screen info */

static int              tfd;

void do_buttondown();

void do_buttonup();

void do_motion();

void text_init();

int term_init();

void do_keystroke();

void do_focusin();

void do_focusout();

void do_enter();

void do_exit();

void do_fdinput();

void printg();

void HandleEvent(GR_EVENT *ep);

int main(int argc, char ** argv)

{

        GR_BITMAP       bitmap1fg[7];   /* mouse cursor */

        GR_BITMAP       bitmap1bg[7];

        if (GrOpen() < 0) {

                fprintf(stderr, "cannot open graphics\n");

                exit(1);

        }

        GrGetScreenInfo(&si);

        w1 = GrNewWindow(GR_ROOT_WINDOW_ID, 50, 30, si.cols - 120,

                si.rows - 60, 1, WHITE, LTBLUE);

        GrSelectEvents(w1, GR_EVENT_MASK_BUTTON_DOWN |

                GR_EVENT_MASK_KEY_DOWN | GR_EVENT_MASK_EXPOSURE |

                GR_EVENT_MASK_FOCUS_IN | GR_EVENT_MASK_FOCUS_OUT |

                GR_EVENT_MASK_CLOSE_REQ);

        GrMapWindow(w1);

        gc1 = GrNewGC();

        gc3 = GrNewGC();

        GrSetGCForeground(gc1, GRAY);

        GrSetGCBackground(gc1, LTBLUE);

        GrSetGCFont(gc1, GrCreateFont(GR_FONT_SYSTEM_FIXED, 0, NULL));

        /*GrSetGCFont(gc1, GrCreateFont(GR_FONT_OEM_FIXED, 0, NULL));*/

        GrSetGCForeground(gc3, WHITE);

        GrSetGCBackground(gc3, BLACK);

        bitmap1fg[0] = MASK(_,_,X,_,X,_,_);

        bitmap1fg[1] = MASK(_,_,_,X,_,_,_);

        bitmap1fg[2] = MASK(_,_,_,X,_,_,_);

        bitmap1fg[3] = MASK(_,_,_,X,_,_,_);

        bitmap1fg[4] = MASK(_,_,_,X,_,_,_);

        bitmap1fg[5] = MASK(_,_,_,X,_,_,_);

        bitmap1fg[6] = MASK(_,_,X,_,X,_,_);

        bitmap1bg[0] = MASK(_,X,X,X,X,X,_);

        bitmap1bg[1] = MASK(_,_,X,X,X,_,_);

        bitmap1bg[2] = MASK(_,_,X,X,X,_,_);

        bitmap1bg[3] = MASK(_,_,X,X,X,_,_);

        bitmap1bg[4] = MASK(_,_,X,X,X,_,_);

        bitmap1bg[5] = MASK(_,_,X,X,X,_,_);

        bitmap1bg[6] = MASK(_,X,X,X,X,X,_);

        GrSetCursor(w1, 7, 7, 3, 3, WHITE, BLACK, bitmap1fg, bitmap1bg);

        /*GrFillRect(GR_ROOT_WINDOW_ID, gc1, 0, 0, si.cols, si.rows);*/

        GrSetGCForeground(gc1, BLACK);

        GrSetGCBackground(gc1, WHITE);

        text_init();

        if (term_init() < 0) {

                GrClose();

                exit(1);

        }

        /* we want tfd events also*/

        GrRegisterInput(tfd);

#if 1

        GrMainLoop(HandleEvent);

#else

        while(1) {

                GR_EVENT ev;

                GrGetNextEvent(&ev);

                HandleEvent(&ev);

        }

#endif

        /* notreached*/

        return 0;

}

void

HandleEvent(GR_EVENT *ep)

{

        switch (ep->type) {

                case GR_EVENT_TYPE_KEY_DOWN:

                        do_keystroke(&ep->keystroke);

                        break;

                case GR_EVENT_TYPE_FOCUS_IN:

                        do_focusin(&ep->general);

                        break;

                case GR_EVENT_TYPE_FOCUS_OUT:

                        do_focusout(&ep->general);

                        break;

                case GR_EVENT_TYPE_CLOSE_REQ:

                        GrClose();

                        exit(0);

                case GR_EVENT_TYPE_FDINPUT:

                        do_fdinput();

                        break;

        }

}

#if ELKS

char * nargv[2] = {"/bin/sash", NULL};

#else

#if DOS_DJGPP

char * nargv[2] = {"bash", NULL};

#else

char * nargv[2] = {"/bin/sh", NULL};

#endif

#endif

void sigchild(int signo)

{

        printg("We have a signal right now!\n");

        GrClose();

        exit(0);

}

int term_init()

{

        char pty_name[12];

        int n = 0;

        pid_t pid;

again:

        sprintf(pty_name, "/dev/ptyp%d", n);

        if ((tfd = open(pty_name, O_RDWR | O_NONBLOCK)) < 0) {

                if ((errno == EBUSY || errno == EIO) && n < 10) {

                        n++;

                        goto again;

                }

                fprintf(stderr, "Can't create pty %s\n", pty_name);

                return -1;

        }

        signal(SIGCHLD, sigchild);

        signal(SIGINT, sigchild);

        if ((pid = fork()) == -1) {

                fprintf(stderr, "No processes\n");

                return -1;

        }

        if (!pid) {

                close(STDIN_FILENO);

                close(STDOUT_FILENO);

                close(STDERR_FILENO);

                close(tfd);

                setsid();

                pty_name[5] = 't';

                if ((tfd = open(pty_name, O_RDWR)) < 0) {

                        fprintf(stderr, "Child: Can't open pty %s\n", pty_name);

                        exit(1);

                }

                dup2(tfd, STDIN_FILENO);

                dup2(tfd, STDOUT_FILENO);

                dup2(tfd, STDERR_FILENO);

                execv(nargv[0], nargv);

                exit(1);

        }

        return 0;

}

GR_SIZE         width;          /* width of character */

GR_SIZE         height;         /* height of character */

GR_SIZE         base;           /* height of baseline */

void text_init()

{

        GrGetGCTextSize(gc1, "A", 1, GR_TFASCII, &width, &height, &base);

}

void char_del(GR_COORD x, GR_COORD y)

{

        xpos -= width;

        GrFillRect(w1, gc3, x, y /*- height*/ /*+ base*/ + 1, width, height);

}

void char_out(GR_CHAR ch)

{

        switch(ch) {

        case '\r':

                xpos = 0;

                return;

        case '\n':

                ypos += height;

                if(ypos > si.rows - 60 - height) {

                        ypos -= height;

#if HAVEBLIT

                        bogl_cfb8_blit(50, 30, si.cols-120,

                                si.rows-60-height, 50, 30+height);

                        GrFillRect(w1, gc3, 50, ypos, si.cols-120, height);

#else

                        /* FIXME: changing FALSE to TRUE crashes nano-X*/

                        /* clear screen, no scroll*/

                        ypos = 0;

                        GrClearWindow(w1, GR_FALSE);

#endif

                }

                return;

        case '\007':                    /* bel*/

                return;

        case '\t':

                xpos += width;

                while((xpos/width) & 7)

                        char_out(' ');

                return;

        case '\b':                      /* assumes fixed width font!!*/

                if (xpos <= 0)

                        return;

                char_del(xpos, ypos);

                return;

        }

        GrText(w1, gc1, xpos+1, ypos, &ch, 1, GR_TFTOP);

        xpos += width;

}

void printg(char * text)

{

        int i;

        for(i = 0; i < strlen(text); i++) {

                char_out(text[i]);

        }

}

/*

 * Here when a keyboard press occurs.

 */

void

do_keystroke(kp)

        GR_EVENT_KEYSTROKE      *kp;

{

        char foo;

        foo = kp->ch;

        write(tfd, &foo, 1);

}

/*

 * Here when a focus in event occurs.

 */

void

do_focusin(gp)

        GR_EVENT_GENERAL        *gp;

{

        if (gp->wid != w1)

                return;

        GrSetBorderColor(w1, LTBLUE);

}

/*

 * Here when a focus out event occurs.

 */

void

do_focusout(gp)

        GR_EVENT_GENERAL        *gp;

{

        if (gp->wid != w1)

                return;

        GrSetBorderColor(w1, GRAY);

}

/*

 * Here to read the shell input file descriptor.

 */

void

do_fdinput()

{

        char    c;

        if (read(tfd, &c, 1) == 1)

                char_out(c);

}