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When incorporating new messages, clear the "new" count before the
inc so the count of new messages is useful afterwards.  This makes
mail behave more like the SunOS version in this respect.

/*	$OpenBSD: cmd1.c,v 1.14 2000/04/25 16:42:22 millert Exp $	*/
/*	$NetBSD: cmd1.c,v 1.9 1997/07/09 05:29:48 mikel Exp $	*/

/*-
 * Copyright (c) 1980, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * 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 developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 THE REGENTS OR CONTRIBUTORS 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.
 */

#ifndef lint
#if 0
static char sccsid[] = "@(#)cmd1.c	8.2 (Berkeley) 4/20/95";
#else
static char rcsid[] = "$OpenBSD: cmd1.c,v 1.14 2000/04/25 16:42:22 millert Exp $";
#endif
#endif /* not lint */

#include "rcv.h"
#include "extern.h"

/*
 * Mail -- a mail program
 *
 * User commands.
 */

/*
 * Print the current active headings.
 * Don't change dot if invoker didn't give an argument.
 */

static int screen;

int
headers(v)
	void *v;
{
	int *msgvec = v;
	int n, mesg, flag, size;
	struct message *mp;

	size = screensize();
	n = msgvec[0];
	if (n != 0)
		screen = (n-1)/size;
	if (screen < 0)
		screen = 0;
	mp = &message[screen * size];
	if (mp >= &message[msgCount])
		mp = &message[msgCount - size];
	if (mp < &message[0])
		mp = &message[0];
	flag = 0;
	mesg = mp - &message[0];
	if (dot != &message[n-1])
		dot = mp;
	for (; mp < &message[msgCount]; mp++) {
		mesg++;
		if (mp->m_flag & MDELETED)
			continue;
		if (flag++ >= size)
			break;
		printhead(mesg);
	}
	if (flag == 0) {
		puts("No more mail.");
		return(1);
	}
	return(0);
}

/*
 * Scroll to the next/previous screen
 */
int
scroll(v)
	void *v;
{
	char *arg = v;
	int size, maxscreen;
	int cur[1];

	cur[0] = 0;
	size = screensize();
	maxscreen = (msgCount - 1) / size;
	switch (*arg) {
	case 0:
	case '+':
		if (screen >= maxscreen) {
			puts("On last screenful of messages");
			return(0);
		}
		screen++;
		break;

	case '-':
		if (screen <= 0) {
			puts("On first screenful of messages");
			return(0);
		}
		screen--;
		break;

	default:
		printf("Unrecognized scrolling command \"%s\"\n", arg);
		return(1);
	}
	return(headers(cur));
}

/*
 * Compute screen size.
 */
int
screensize()
{
	int s;
	char *cp;

	if ((cp = value("screen")) != NULL && (s = atoi(cp)) > 0)
		return(s);
	return(screenheight - 4);
}

/*
 * Print out the headlines for each message
 * in the passed message list.
 */
int
from(v)
	void *v;
{
	int *msgvec = v;
	int *ip;

	for (ip = msgvec; *ip != NULL; ip++)
		printhead(*ip);
	if (--ip >= msgvec)
		dot = &message[*ip - 1];
	return(0);
}

/*
 * Print out the header of a specific message.
 * This is a slight improvement to the standard one.
 */
void
printhead(mesg)
	int mesg;
{
	struct message *mp;
	char headline[LINESIZE], wcount[LINESIZE], *subjline, dispc, curind;
	char pbuf[BUFSIZ];
	struct headline hl;
	int subjlen;
	char *name;

	mp = &message[mesg-1];
	(void)readline(setinput(mp), headline, LINESIZE);
	if ((subjline = hfield("subject", mp)) == NULL)
		subjline = hfield("subj", mp);
	/*
	 * Bletch!
	 */
	curind = dot == mp ? '>' : ' ';
	dispc = ' ';
	if (mp->m_flag & MSAVED)
		dispc = '*';
	if (mp->m_flag & MPRESERVE)
		dispc = 'P';
	if ((mp->m_flag & (MREAD|MNEW)) == MNEW)
		dispc = 'N';
	if ((mp->m_flag & (MREAD|MNEW)) == 0)
		dispc = 'U';
	if (mp->m_flag & MBOX)
		dispc = 'M';
	parse(headline, &hl, pbuf);
	(void)snprintf(wcount, sizeof(wcount), "%3d/%-5d", mp->m_lines,
	    mp->m_size);
	subjlen = screenwidth - 50 - strlen(wcount);
	name = value("show-rcpt") != NULL ?
		skin(hfield("to", mp)) : nameof(mp, 0);
	if (subjline == NULL || subjlen < 0)		/* pretty pathetic */
		printf("%c%c%3d %-20.20s  %16.16s %s\n",
			curind, dispc, mesg, name, hl.l_date, wcount);
	else
		printf("%c%c%3d %-20.20s  %16.16s %s \"%.*s\"\n",
			curind, dispc, mesg, name, hl.l_date, wcount,
			subjlen, subjline);
}

/*
 * Print out the value of dot.
 */
int
pdot(v)
	void *v;
{
	printf("%d\n", (int)(dot - &message[0] + 1));
	return(0);
}

/*
 * Print out all the possible commands.
 */
int
pcmdlist(v)
	void *v;
{
	extern const struct cmd cmdtab[];
	const struct cmd *cp;
	int cc;

	puts("Commands are:");
	for (cc = 0, cp = cmdtab; cp->c_name != NULL; cp++) {
		cc += strlen(cp->c_name) + 2;
		if (cc > 72) {
			putchar('\n');
			cc = strlen(cp->c_name) + 2;
		}
		if ((cp+1)->c_name != NULL)
			printf("%s, ", cp->c_name);
		else
			puts(cp->c_name);
	}
	return(0);
}

/*
 * Paginate messages, honor ignored fields.
 */
int
more(v)
	void *v;
{
	int *msgvec = v;
	return(type1(msgvec, 1, 1));
}

/*
 * Paginate messages, even printing ignored fields.
 */
int
More(v)
	void *v;
{
	int *msgvec = v;

	return(type1(msgvec, 0, 1));
}

/*
 * Type out messages, honor ignored fields.
 */
int
type(v)
	void *v;
{
	int *msgvec = v;

	return(type1(msgvec, 1, 0));
}

/*
 * Type out messages, even printing ignored fields.
 */
int
Type(v)
	void *v;
{
	int *msgvec = v;

	return(type1(msgvec, 0, 0));
}

/*
 * Type out the messages requested.
 */
sigjmp_buf	pipestop;
int
type1(msgvec, doign, page)
	int *msgvec;
	int doign, page;
{
	int nlines, *ip;
	struct message *mp;
	char *cp;
	FILE *obuf;
#if __GNUC__
	/* Avoid siglongjmp clobbering */
	(void)&cp;
	(void)&obuf;
#endif

	obuf = stdout;
	if (sigsetjmp(pipestop, 1))
		goto close_pipe;
	if (value("interactive") != NULL &&
	    (page || (cp = value("crt")) != NULL)) {
		nlines = 0;
		if (!page) {
			for (ip = msgvec; *ip && ip-msgvec < msgCount; ip++)
				nlines += message[*ip - 1].m_lines;
		}
		if (page || nlines > (*cp ? atoi(cp) : realscreenheight)) {
			cp = value("PAGER");
			if (cp == NULL || *cp == '\0')
				cp = _PATH_MORE;
			obuf = Popen(cp, "w");
			if (obuf == NULL) {
				warn(cp);
				obuf = stdout;
			} else
				(void)signal(SIGPIPE, brokpipe);
		}
	}
	for (ip = msgvec; *ip && ip - msgvec < msgCount; ip++) {
		mp = &message[*ip - 1];
		touch(mp);
		dot = mp;
		if (value("quiet") == NULL)
			fprintf(obuf, "Message %d:\n", *ip);
		(void)send(mp, obuf, doign ? ignore : 0, NULL);
	}
close_pipe:
	if (obuf != stdout) {
		/*
		 * Ignore SIGPIPE so it can't cause a duplicate close.
		 */
		(void)signal(SIGPIPE, SIG_IGN);
		(void)Pclose(obuf);
		(void)signal(SIGPIPE, SIG_DFL);
	}
	return(0);
}

/*
 * Respond to a broken pipe signal --
 * probably caused by quitting more.
 */
void
brokpipe(signo)
	int signo;
{
	siglongjmp(pipestop, 1);
}

/*
 * Print the top so many lines of each desired message.
 * The number of lines is taken from the variable "toplines"
 * and defaults to 5.
 */
int
top(v)
	void *v;
{
	int *msgvec = v;
	int *ip;
	struct message *mp;
	int c, topl, lines, lineb;
	char *valtop, linebuf[LINESIZE];
	FILE *ibuf;

	topl = 5;
	valtop = value("toplines");
	if (valtop != NULL) {
		topl = atoi(valtop);
		if (topl < 0 || topl > 10000)
			topl = 5;
	}
	lineb = 1;
	for (ip = msgvec; *ip && ip-msgvec < msgCount; ip++) {
		mp = &message[*ip - 1];
		touch(mp);
		dot = mp;
		if (value("quiet") == NULL)
			printf("Message %d:\n", *ip);
		ibuf = setinput(mp);
		c = mp->m_lines;
		if (!lineb)
			putchar('\n');
		for (lines = 0; lines < c && lines <= topl; lines++) {
			if (readline(ibuf, linebuf, sizeof(linebuf)) < 0)
				break;
			puts(linebuf);
			lineb = blankline(linebuf);
		}
	}
	return(0);
}

/*
 * Touch all the given messages so that they will
 * get mboxed.
 */
int
stouch(v)
	void *v;
{
	int *msgvec = v;
	int *ip;

	for (ip = msgvec; *ip != 0; ip++) {
		dot = &message[*ip-1];
		dot->m_flag |= MTOUCH;
		dot->m_flag &= ~MPRESERVE;
	}
	return(0);
}

/*
 * Make sure all passed messages get mboxed.
 */
int
mboxit(v)
	void *v;
{
	int *msgvec = v;
	int *ip;

	for (ip = msgvec; *ip != 0; ip++) {
		dot = &message[*ip-1];
		dot->m_flag |= MTOUCH|MBOX;
		dot->m_flag &= ~MPRESERVE;
	}
	return(0);
}

/*
 * List the folders the user currently has.
 */
int
folders(v)
	void *v;
{
	char dirname[PATHSIZE];
	char *cmd;

	if (getfold(dirname, sizeof(dirname)) < 0) {
		puts("No value set for \"folder\"");
		return(1);
	}
	if ((cmd = value("LISTER")) == NULL)
		cmd = "ls";
	(void)run_command(cmd, 0, -1, -1, dirname, NULL, NULL);
	return(0);
}

/*
 * Update the mail file with any new messages that have
 * come in since we started reading mail.
 */
int
inc(v)
	void *v;
{
	int nmsg, mdot;

	nmsg = incfile();

	if (nmsg == 0) {
		puts("No new mail.");
	} else if (nmsg > 0) {
		mdot = newfileinfo(msgCount - nmsg);
		dot = &message[mdot - 1];
		clearnew();
	} else {
		puts("\"inc\" command failed...");
	}

	return(0);
}