/*	$NetBSD: msg_sys.def,v 1.17 1999/07/04 22:55:48 cgd Exp $	*/

/*
 * Copyright 1997 Piermont Information Systems Inc.
 * All rights reserved.
 *
 * Written by Philip A. Nelson for Piermont Information Systems Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software develooped for the NetBSD Project by
 *      Piermont Information Systems Inc.
 * 4. The name of Piermont Information Systems Inc. may not be used to endorse
 *    or promote products derived from this software without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY PIERMONT INFORMATION SYSTEMS INC. ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL PIERMONT INFORMATION SYSTEMS INC. BE 
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 
 * THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

static WINDOW *msg_win = NULL;
static char *cbuffer;
static size_t cbuffersize;

static int last_i_was_nl, last_i_was_space;
static int last_o_was_punct, last_o_was_space;

static void	_msg_beep(void);
static int	_msg_vprintf(int auto_fill, const char *fmt, va_list ap);
static void	_msg_vprompt(const char *msg, int do_echo, const char *def,
		    char *val, int max_chars, va_list ap);

/* Routines */

static void
_msg_beep(void)
{
	fprintf(stderr, "\a");
}

int msg_window(WINDOW *window)
{
	size_t ncbuffersize;
	char *ncbuffer;

	msg_win = window;

	ncbuffersize = getmaxx(window) * getmaxy(window) + 1;
	if (ncbuffersize > cbuffersize) {
		ncbuffer = malloc(ncbuffersize);
		if (ncbuffer == NULL)
			return 1;
		if (cbuffer != NULL)
			free(cbuffer);
		cbuffer = ncbuffer;
		cbuffersize = ncbuffersize;
	}
	return 0;
}

const char *msg_string (msg msg_no)
{
	return msg_list[(long)msg_no];
}

void msg_clear(void)
{
	wclear (msg_win);
	wrefresh (msg_win);
	last_o_was_punct = 0;
	last_o_was_space = 1;
}

void msg_standout(void)
{
	wstandout(msg_win);
}

void msg_standend(void)
{
	wstandend(msg_win);
}

static int
_msg_vprintf(int auto_fill, const char *fmt, va_list ap)
{
	const char *wstart, *afterw;
	int wordlen, nspaces;
	int ret;

	ret = vsnprintf (cbuffer, cbuffersize, fmt, ap);

	if (!auto_fill) {
		waddstr(msg_win, cbuffer);

		/*
		 * nothing is perfect if they flow text after a table,
		 * but this may be decent.
		 */
		last_i_was_nl = last_i_was_space = 1;
		last_o_was_punct = 0;
		last_o_was_space = 1;
		goto out;
	}

	for (wstart = afterw = cbuffer; *wstart; wstart = afterw) {

		/* eat one space, or a whole word of non-spaces */
		if (isspace(*afterw))
			afterw++;
		else
			while (*afterw && !isspace(*afterw))
				afterw++;

		/* this is an nl: special formatting necessary */
		if (*wstart == '\n') {
			if (last_i_was_nl || last_i_was_space) {

				if (getcurx(msg_win) != 0)
					waddch(msg_win, '\n');
				if (last_i_was_nl) {
					/* last was an nl: paragraph break */
					waddch(msg_win, '\n');
				} else {
					/* last was space: line break */
				}
				last_o_was_punct = 0;
				last_o_was_space = 1;
			} else {
				/* last_o_was_punct unchanged */
				/* last_o_was_space unchanged */
			}
			last_i_was_space = 1;
			last_i_was_nl = 1;
			continue;
		}

		/* this is a tab: special formatting necessary. */
		if (*wstart == '\t') {
			if (last_i_was_nl) {
				/* last was an nl: list indent */
				if (getcurx(msg_win) != 0)
					waddch(msg_win, '\n');
			} else {
				/* last was not an nl: columns */
			}
			waddch(msg_win, '\t');
			last_i_was_nl = 0;
			last_i_was_space = 1;
			last_o_was_punct = 0;
			last_o_was_space = 1;
			continue;
		}

		/* this is a space: ignore it but set flags */
		last_i_was_nl = 0;	/* all newlines handled above */
		last_i_was_space = isspace(*wstart);
		if (last_i_was_space)
			continue;

		/*
		 * we have a real "word," i.e. a sequence of non-space
		 * characters.  wstart is now the start of the word,
		 * afterw is the next character after the end.
		 */
		wordlen = afterw - wstart;
		nspaces = last_o_was_space ? 0 : (last_o_was_punct ? 2 : 1);
		if ((getcurx(msg_win) + nspaces + wordlen) >=
		      getmaxx(msg_win) &&
		    wordlen < (getmaxx(msg_win) / 3)) {
			/* wrap the line */
			waddch(msg_win, '\n');
			nspaces = 0;
		}

		/* output the word, preceded by spaces if necessary */
		while (nspaces-- > 0)
			waddch(msg_win, ' ');
		waddbytes(msg_win, wstart, wordlen);

		/* set up the 'last' state for the next time around */
		switch (afterw[-1]) {
		case '.':
		case '?':
		case '!':
			last_o_was_punct = 1;
			break;
		default:
			last_o_was_punct = 0;
			break;
		}
		last_o_was_space = 0;

		/* ... and do it all again! */
	}

	/* String ended with a newline.  They really want a line break. */
	if (last_i_was_nl) {
		if (getcurx(msg_win) != 0)
			waddch(msg_win, '\n');
		last_o_was_punct = 0;
		last_o_was_space = 1;
	}

out:
	wrefresh (msg_win);
	return ret;
}

void msg_display(msg msg_no, ...)
{
	va_list ap;

	msg_clear();

	va_start(ap, msg_no);
	(void)_msg_vprintf(1, msg_string(msg_no), ap);
	va_end(ap);
}

void msg_display_add(msg msg_no, ...)
{
	va_list ap;

	va_start (ap, msg_no);
	(void)_msg_vprintf(1, msg_string(msg_no), ap);
	va_end (ap);
}


static void
_msg_vprompt(const char *msg, int do_echo, const char *def, char *val,
    int max_chars, va_list ap)
{
	int ch;
	int count = 0;
	int y,x;
	char *ibuf = alloca(max_chars);

	_msg_vprintf(0, msg, ap);
	if (def != NULL && *def) {
		waddstr (msg_win, " [");
		waddstr (msg_win, def);
		waddstr (msg_win, "]");
	}
	waddstr (msg_win, ": ");
	wrefresh (msg_win);

	while ((ch = wgetch(msg_win)) != '\n') {
		if (ch == 0x08 || ch == 0x7f) {  /* bs or del */
			if (count > 0) {
				count--;
				if (do_echo) {
					getyx(msg_win, y, x);
					x--;
					wmove(msg_win, y, x);
					wdelch(msg_win);
				}
			} else
				_msg_beep();
		} else if (ch == 0x15) {	/* ^U; line kill */
			while (count > 0) {
				count--;
				if (do_echo) {
					getyx(msg_win, y, x);
					x--;
					wmove(msg_win, y, x);
					wdelch(msg_win);
				}
			}
		} else if (ch == 0x17) {        /* ^W; word kill */
			/*
			 * word kill kills the spaces and the 'word'
			 * (non-spaces) last typed.  the spaces before
			 * the 'word' aren't killed.
			 */
			while (count > 0 && isspace(ibuf[count - 1])) {
				count--;
				if (do_echo) {
					getyx(msg_win, y, x);
					x--;
					wmove(msg_win, y, x);
					wdelch(msg_win);
				}
			}
			while (count > 0 && !isspace(ibuf[count - 1])) {
				count--;
				if (do_echo) {
					getyx(msg_win, y, x);
					x--;
					wmove(msg_win, y, x);
					wdelch(msg_win);
				}
			}
		} else if (count < (max_chars - 1) && isprint(ch)) {
			if (do_echo)
				waddch (msg_win, ch);
			ibuf[count++] = ch;
		} else
			_msg_beep();
		if (do_echo)
			wrefresh(msg_win);
	}
	if (do_echo) {
		waddch(msg_win, '\n');
		last_o_was_punct = 0;
		last_o_was_space = 1;
	}

	/* copy the appropriate string to the output */
	if (count != 0) {
		ibuf[count] = '\0';
		strcpy(val, ibuf);		/* size known to be OK */
	} else if (def != NULL && val != def) {
		strncpy(val, def, max_chars);
		val[max_chars - 1] = '\0';
	}
}

void
msg_prompt(msg msg_no, const char *def, char *val, int max_chars, ...)
{
	va_list ap;

	msg_clear();

	va_start (ap, max_chars);
	_msg_vprompt(msg_string(msg_no), 1, def, val, max_chars, ap);
	va_end (ap);
}

void
msg_prompt_add(msg msg_no, const char *def, char *val, int max_chars, ...)
{
	va_list ap;

	va_start (ap, max_chars);
	_msg_vprompt(msg_string(msg_no), 1, def, val, max_chars, ap);
	va_end(ap);
}

void
msg_prompt_noecho(msg msg_no, const char *def, char *val, int max_chars, ...)
{
	va_list ap;

	msg_clear();

	va_start (ap, max_chars);
	_msg_vprompt(msg_string(msg_no), 0, def, val, max_chars, ap);
	va_end (ap);
}

void msg_table_add(msg msg_no, ...)
{
	va_list ap;

	va_start (ap, msg_no);
	(void)_msg_vprintf(0, msg_string(msg_no), ap);
	va_end (ap);
}