wesommer modified error reporting.

[moira.git] / clients / moira / menu.c

/*
 * Copyright 1987 by the Massachusetts Institute of Technology.
 * For copying and distribution information, see the file
 * "mit-copyright.h".
 *
 * $Source$
 * $Author$
 * $Header$
 * $Log$
 * Revision 1.5  1987-08-07 18:09:46  poto
 * will not enter menu if ->m_entry returns DM_QUIT;
 * the command args from a submenu command will be passed on to ->m_entry();
 *
 * Revision 1.4  87/08/05  14:48:04  ambar
 * added latest set of hackery, to fix missing
 * newlines, and not being able to quit out of
 * the pager.
 * 
 * Revision 1.3  87/08/03  05:10:34  wesommer
 * This one appears to work.
 * 
 * Revision 1.2  87/08/03  04:16:51  wesommer
 * Here's another, which is probably better.
 * 
 * Revision 1.1  87/07/31  18:02:23  ambar
 * Initial revision
 * 
 *
 * Generic menu system module.
 *
 * Basically, we define an enormous tree structure which represents the
 * menu.  Some extra pieces (ml_command, ma_doc) get thrown in so we can
 * also use the structure for a command-based system.
 *
 * By making the menu descriptions so general, we can ease porting to just
 * about anything.
 */

#ifndef lint
static char rcsid_menu_c[] = "$Header$";

#endif lint

#include <stdio.h>
#include <curses.h>
#include <ctype.h>
#include "menu.h"

#define MAX(A,B) ((A) > (B) ? (A) : (B))
#define MIN(A,B) ((A) < (B) ? (A) : (B))

#define MIN_INPUT 2		/* Minimum number of lines for input window */

char *strcpy();
char *strncpy();
int more_flg = 1;

/* Structure for holding current displayed menu */
struct menu_screen {
    WINDOW *ms_screen;		/* Window for this menu */
    WINDOW *ms_title;		/* Title subwindow */
    WINDOW *ms_menu;		/* Menu subwindow */
    WINDOW *ms_input;		/* Input subwindow */
    int ms_input_y;		/* Input subwindow reference coordinate */
}          *cur_ms;

#define NULLMS ((struct menu_screen *) 0)

Menu *top_menu;			/* Root for command search */

/*
 * Start_menu takes a menu as an argument.  It initializes curses u.s.w.,
 * and a quit in any submenu should unwind back to here.  (it might not,
 * if user functions which run their own menus don't cooperate.)
 * Start_menu should only be called once, at the start of the program.
 */
Start_menu(m)
    Menu *m;
{
    struct menu_screen *make_ms();

    if (initscr() == ERR) {
	fputs("Can't initialize curses!\n", stderr);
	Start_no_menu(m);
    }
    raw();			/* We parse & print everything ourselves */
    noecho();
    cur_ms = make_ms(0);	/* So we always have some current menu_screen */
    top_menu = m;
    /* Run the menu */
    (void) Do_menu(m, 0, (char **) NULL);
    endwin();
}

/* Like Start_menu, except it doesn't print menus and doesn't use curses */
Start_no_menu(m)
    Menu *m;
{
    cur_ms = NULLMS;
    top_menu = m;
    /* Run the menu */
    (void) Do_menu(m, 0, (char **) NULL);
}

/*
 * Create a new menu screen template with the specified menu length
 * and return it.
 */
struct menu_screen *
make_ms(length)
    int length;
{
    struct menu_screen *ms;
    char *malloc();

    if (MAX_TITLE + length + MIN_INPUT > LINES) {
	fputs("Menu too big!\n", stderr);
	exit(2);
    }

    ms = (struct menu_screen *) malloc(sizeof(struct menu_screen));

    ms->ms_screen = newwin(0, 0, 0, 0);
    ms->ms_title = subwin(ms->ms_screen, MAX_TITLE, 0, 0, 0);
    ms->ms_menu = subwin(ms->ms_screen,
			 length, 0, MAX_TITLE, 0);
    ms->ms_input = subwin(ms->ms_screen, 0, 0,
			  ms->ms_input_y = MAX_TITLE + length,
			  0);

    scrollok(ms->ms_input, TRUE);
    (void) wmove(ms->ms_input, 0, 0);
    (void) wclear(ms->ms_screen);

    return (ms);
}

/*
 * This routine destroys a menu_screen.
 */
destroy_ms(ms)
    struct menu_screen *ms;
{
    delwin(ms->ms_title);
    delwin(ms->ms_menu);
    delwin(ms->ms_input);
    delwin(ms->ms_screen);
    free((char *) ms);
}

/*
 * This guy actually puts up the menu
 */
int 
Do_menu(m, margc, margv)
    Menu *m;
    int margc;
    char *margv[];
{
    struct menu_screen *my_ms, *old_cur_ms;
    char argvals[MAX_ARGC][MAX_ARGLEN];	/* This is where args are stored */
    char buf[MAX_ARGC * MAX_ARGLEN];
    char *argv[MAX_ARGC];
    int line;
    int i;
    struct menu_line *command, *Find_command();
    int argc;
    int quitflag;

    /* Entry function gets called with old menu_screen still current */
    if (m->m_entry != NULLFUNC)
	if (m->m_entry(m, margc, margv) == DM_QUIT)
	    return DM_NORMAL;

    /* The following get run only in curses mode */
    if (cur_ms != NULLMS) {
	/* Get a menu_screen */
	old_cur_ms = cur_ms;
	cur_ms = my_ms = make_ms(m->m_length + 2);

	/* Now print the title and the menu */
	(void) wclear(my_ms->ms_menu);
	(void) wmove(my_ms->ms_title, 0, MAX(0, (COLS -
						 strlen(m->m_title)) >> 1));
	(void) wstandout(my_ms->ms_title);
	(void) waddstr(my_ms->ms_title, m->m_title);
	(void) wstandend(my_ms->ms_title);

	for (line = 0; line < m->m_length; line++) {
	    (void) wmove(my_ms->ms_menu, line, 0);
	    (void) wprintw(my_ms->ms_menu, "%2d. (%-12s) %s.", line + 1,
			   m->m_lines[line].ml_command,
			   m->m_lines[line].ml_doc);
	}
	(void) wmove(my_ms->ms_menu, line++, 0);
	(void) waddstr(my_ms->ms_menu, " r. (return      ) Return to previous menu.");
	(void) wmove(my_ms->ms_menu, line, 0);
	(void) waddstr(my_ms->ms_menu, " q. (quit        ) Quit.");

    }

    for (;;) {
	/* This will be set by a return val from func or submenu */
	quitflag = DM_NORMAL;
	/* This is here because we may be coming from another menu */
	if (cur_ms != NULL)
	    touchwin(my_ms->ms_screen);
	/* Get a command */
	Prompt_input("Command: ", buf, sizeof(buf));
	/* Parse it into the argument list */
	/* If there's nothing there, try again */
	/* Initialize argv */
	for (argc = 0; argc < MAX_ARGC; argc++)
	    argv[argc] = argvals[argc];

	if ((argc = Parse_words(buf, argv, MAX_ARGLEN)) == 0)
	    continue;
	if ((line = atoi(argv[0])) > 0 && line <= m->m_length) {
	    command = &m->m_lines[line - 1];
	}
	else if (!strcmp(argv[0], "r")
		 || !strcmp(argv[0], "q")
		 || !strcmp(argv[0], "return")
		 || !strcmp(argv[0], "quit")) {
	    /* here if it's either return or quit */
	    if (cur_ms != NULLMS) {
		cur_ms = old_cur_ms;
		destroy_ms(my_ms);
	    }
	    if (m->m_exit != NULLFUNC)
		m->m_exit(m);
	    return (*argv[0] == 'r' ? DM_NORMAL : DM_QUIT);
	    /* finally, try to find it using Find_command */
	}
	else if ((command = Find_command(argvals[0])) ==
		 (struct menu_line *) 0) {
	    Put_message("Command not recognized");
	    continue;
	}
	/* If we got to here, command is a valid menu_line */
	/* Send the offical command name into the argv */
	(void) strcpy(argvals[0], command->ml_command);
	/* Show that we're working on it */
	Put_message(command->ml_doc);
	/* Print args that we've already got */
	for (i = 1; i < argc; i++) {
	    if (command->ml_args[i].ma_prompt == NULL)
		break;
	    (void) sprintf(buf, "%s%s", command->ml_args[i].ma_prompt,
			   argv[i]);
	    Put_message(buf);
	}
	/* Get remaining arguments, if any */
	for (; argc < command->ml_argc; argc++) {
	    Prompt_input(command->ml_args[argc].ma_prompt,
			 argvals[argc], sizeof(argvals[argc]));
	}
	if (command->ml_function != NULLFUNC) {
	    /* If it's got a function, call it */
	    quitflag = command->ml_function(argc, argv);
	}
	else if (command->ml_submenu != NULLMENU) {
	    /* Else see if it is a submenu */
	    quitflag = Do_menu(command->ml_submenu, argc, argv);
	}
	else {
	    /* If it's got neither, something is wrong */
	    Put_message("*INTERNAL ERROR: NO FUNCTION OR MENU FOR LINE*");
	}
	if (quitflag == DM_QUIT) {
	    if (cur_ms != NULLMS) {
		cur_ms = old_cur_ms;
		destroy_ms(my_ms);
	    }
	    if (m->m_exit != NULLFUNC)
		m->m_exit(m);
	    return (DM_QUIT);
	}
    }
}

/* Prompt the user for input in the input window of cur_ms */
Prompt_input(prompt, buf, buflen)
    char *prompt;
    char *buf;
    int buflen;
{
    int c;
    char *p;
    int y, x, oldx;

    if (cur_ms != NULLMS) {
	more_flg = 1;
	getyx(cur_ms->ms_input, y, x);
	(void) wmove(cur_ms->ms_input, y, 0);

	touchwin(cur_ms->ms_screen);
	refresh_ms(cur_ms);
	(void) waddstr(cur_ms->ms_input, prompt);
	getyx(cur_ms->ms_input, y, x);

	oldx = x;
	for (p = buf; p - buf < buflen;) {
	    (void) wmove(cur_ms->ms_input, y, x);
	    (void) wclrtoeol(cur_ms->ms_input);
	    refresh_ms(cur_ms);
	    c = getchar();
	    switch (c) {
	    case 'L' & 037:
		(void) wmove(cur_ms->ms_input, 0, 0);
		getyx(cur_ms->ms_input, y, x);

		touchwin(cur_ms->ms_screen);
		(void) wclear(cur_ms->ms_input);
		(void) waddstr(cur_ms->ms_input, prompt);
		getyx(cur_ms->ms_input, y, x);
		refresh_ms(cur_ms);

		break;
	    case '\n':
	    case '\r':
		(void) waddch(cur_ms->ms_input, '\n');
		(void) waddch(cur_ms->ms_input, '\r');

		(void) wclrtoeol(cur_ms->ms_input);
		refresh_ms(cur_ms);
		*p = '\0';
		Start_paging();
		return;
	    case '\b':
	    case '\177':
		if (p > buf) {
		    p--;
		    x--;
		}
		break;
	    case 'U' & 037:
	    case '\007':
	    case '\033':
		x = oldx;
		p = buf;
		break;
	    default:
		(void) waddch(cur_ms->ms_input, c);
		*p++ = c;
		x++;
		break;
	    }
	}
    }
    else {
	printf("%s", prompt);
	(void) gets(buf);
	Start_paging();
	return;
    }
}

int lines_left;

/* Start paging */
/* This routine will cause the most recently put message to be the
   one at the top of the screen when a ---More--- prompt is displayed */
Start_paging()
{
    if (cur_ms != NULLMS) {
	lines_left = LINES - cur_ms->ms_input_y - 1;
    }
    else {
	lines_left = 23;
    }
}

/* Turn off paging */
Stop_paging()
{
    lines_left = -1;
}

/* Print a message in the input window of cur_ms */
Put_message(msg)
    char *msg;
{
    int y, x, i;
    char *msg1, chr;

    if (!more_flg)
	return;

    if (lines_left >= 0) {
	if (--lines_left == 0) {
	    /* Give the user a more prompt */
	    if (cur_ms != NULLMS) {
		(void) wstandout(cur_ms->ms_input);
		(void) wprintw(cur_ms->ms_input, "---More---");
		(void) wstandend(cur_ms->ms_input);
		refresh_ms(cur_ms);
		chr = getchar();/* We do care what it is */
		if (chr == 'q' || chr == 'Q') {
		    more_flg = 0;
		    return;
		}
		getyx(cur_ms->ms_input, y, x);
		(void) wmove(cur_ms->ms_input, y, 0);
		(void) wclrtoeol(cur_ms->ms_input);
	    }
	    else {
		printf("---More (hit return)---");
		(void) getchar();
	    }
	    Start_paging();	/* Reset lines_left */
	}
    }

    if (cur_ms != NULLMS) {
	msg1 = (char *) calloc(COLS, 1);
	(void) strcpy(msg1, msg);
	for (i = strlen(msg); i < COLS - 1; i++)
	    msg1[i] = ' ';
	(void) wprintw(cur_ms->ms_input, "%s\n", msg1);
/*	refresh_ms(cur_ms); */
    }
    else {
	puts(msg);
    }
}

/* Refresh a menu_screen onto the real screen */
refresh_ms(ms)
    struct menu_screen *ms;
{
    int y, x;

    getyx(ms->ms_input, y, x);
    (void) wmove(ms->ms_screen, y + ms->ms_input_y, x);
    (void) wrefresh(ms->ms_screen);
}

/* Parse buf into a list of words, which will be placed in strings specified by
   argv.  Space for these strings must have already been allocated.
   Only the first n characters of each word will be copied */
Parse_words(buf, argv, n)
    char *buf;
    char *argv[];
int n;

{
    char *start, *end;		/* For sausage machine */
    int argc;

    start = buf;
    for (argc = 0; argc < MAX_ARGC; argc++) {
	while (isspace(*start))
	    start++;		/* Kill whitespace */
	if (*start == '\0')
	    break;		/* Nothing left */
	/* Now find the end of the word */
	for (end = start; *end != '\0' && !isspace(*end); end++);
	(void) strncpy(argv[argc], start, MIN(end - start, n));	/* Copy it */
	argv[argc][MIN(end - start, n - 1)] = '\0';	/* Terminate */
	start = end;
    }
    return (argc);
}

/* This is the internal form of Find_command, which recursively searches
   for a menu_line with command command in the specified menu */
/* It will search to a maximum depth of d */
struct menu_line *
find_command_from(c, m, d)
    char *c;
    struct menu *m;
    int d;
{
    int line;
    struct menu_line *maybe;

    if (d < 0)
	return ((struct menu_line *) 0);	/* Too deep! */
    for (line = 0; line < m->m_length; line++) {
	if (!strcmp(c, m->m_lines[line].ml_command)) {
	    return (&m->m_lines[line]);
	}
	else if (m->m_lines[line].ml_submenu != NULLMENU
		 && (maybe =
		   find_command_from(c, m->m_lines[line].ml_submenu, d - 1))
		 != (struct menu_line *) 0) {
	    return (maybe);
	}
    }
    /* If we got to here, nothing works */
    return ((struct menu_line *) 0);
}

/* Find_command searches down the current menu tree */
/* And returns a pointer to a menu_line with the specified command name */
/* It returns (struct menu_line *) 0 if none is found */
struct menu_line *
Find_command(command)
    char *command;
{
    if (top_menu == NULLMENU) {
	return ((struct menu_line *) 0);
    }
    else {
	return (find_command_from(command, top_menu, MAX_MENU_DEPTH));
    }
}

/*
 * Local Variables:
 * mode: c
 * c-indent-level: 4
 * c-continued-statement-offset: 4
 * c-brace-offset: -4
 * c-argdecl-indent: 4
 * c-label-offset: -4
 * End:
 */