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Fully integrate apropos(1) into mandoc(1).
Switch the argmode on the progname, including man(1).
Provide -f and -k options to switch the argmode.
Store the argmode inside struct search, generalizing the flags.
Derive the deftype from the argmode when needed instead of storing it.
Store the outkey inside struct search instead of passing it alone.
While here, get rid of the trailing blanks in Makefile.depend.

/*	$Id: manpage.c,v 1.9 2014/08/17 03:24:47 schwarze Exp $ */
/*
 * Copyright (c) 2012 Kristaps Dzonsons <kristaps@bsd.lv>
 * Copyright (c) 2013 Ingo Schwarze <schwarze@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
#include "config.h"

#include <sys/types.h>

#include <assert.h>
#include <getopt.h>
#include <limits.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "manpath.h"
#include "mansearch.h"

static	void	 show(const char *, const char *);

int
main(int argc, char *argv[])
{
	int		 ch, term;
	size_t		 i, sz, len;
	struct mansearch search;
	struct manpage	*res;
	char		*conf_file, *defpaths, *auxpaths, *cp;
	char		 buf[PATH_MAX];
	const char	*cmd;
	struct manpaths	 paths;
	char		*progname;
	extern char	*optarg;
	extern int	 optind;

	term = isatty(STDIN_FILENO) && isatty(STDOUT_FILENO);

	progname = strrchr(argv[0], '/');
	if (progname == NULL)
		progname = argv[0];
	else
		++progname;

	auxpaths = defpaths = conf_file = NULL;
	memset(&paths, 0, sizeof(struct manpaths));
	memset(&search, 0, sizeof(struct mansearch));

	while (-1 != (ch = getopt(argc, argv, "C:M:m:S:s:")))
		switch (ch) {
		case ('C'):
			conf_file = optarg;
			break;
		case ('M'):
			defpaths = optarg;
			break;
		case ('m'):
			auxpaths = optarg;
			break;
		case ('S'):
			search.arch = optarg;
			break;
		case ('s'):
			search.sec = optarg;
			break;
		default:
			goto usage;
		}

	argc -= optind;
	argv += optind;

	if (0 == argc)
		goto usage;

	search.outkey = "Nd";
	search.argmode = ARG_EXPR;

	manpath_parse(&paths, conf_file, defpaths, auxpaths);
	ch = mansearch(&search, &paths, argc, argv, &res, &sz);
	manpath_free(&paths);

	if (0 == ch)
		goto usage;

	if (0 == sz) {
		free(res);
		return(EXIT_FAILURE);
	} else if (1 == sz && term) {
		i = 1;
		goto show;
	} else if (NULL == res)
		return(EXIT_FAILURE);

	for (i = 0; i < sz; i++) {
		printf("%6zu  %s: %s\n", 
			i + 1, res[i].names, res[i].output);
		free(res[i].names);
		free(res[i].output);
	}

	if (0 == term) {
		for (i = 0; i < sz; i++)
			free(res[i].file);
		free(res);
		return(EXIT_SUCCESS);
	}

	i = 1;
	printf("Enter a choice [1]: ");
	fflush(stdout);

	if (NULL != (cp = fgetln(stdin, &len)))
		if ('\n' == cp[--len] && len > 0) {
			cp[len] = '\0';
			if ((i = atoi(cp)) < 1 || i > sz)
				i = 0;
		}

	if (0 == i) {
		for (i = 0; i < sz; i++)
			free(res[i].file);
		free(res);
		return(EXIT_SUCCESS);
	}
show:
	cmd = res[i - 1].form ? "mandoc" : "cat";
	strlcpy(buf, res[i - 1].file, PATH_MAX);
	for (i = 0; i < sz; i++)
		free(res[i].file);
	free(res);

	show(cmd, buf);
	/* NOTREACHED */
usage:
	fprintf(stderr, "usage: %s [-C conf] "
			 	  "[-M paths] "
				  "[-m paths] "
				  "[-S arch] "
				  "[-s section] "
			          "expr ...\n", 
				  progname);
	return(EXIT_FAILURE);
}

static void
show(const char *cmd, const char *file)
{
	int		 fds[2];
	pid_t		 pid;

	if (-1 == pipe(fds)) {
		perror(NULL);
		exit(EXIT_FAILURE);
	}

	if (-1 == (pid = fork())) {
		perror(NULL);
		exit(EXIT_FAILURE);
	} else if (pid > 0) {
		dup2(fds[0], STDIN_FILENO);
		close(fds[1]);
		cmd = NULL != getenv("MANPAGER") ? 
			getenv("MANPAGER") :
			(NULL != getenv("PAGER") ? 
			 getenv("PAGER") : "more");
		execlp(cmd, cmd, (char *)NULL);
		perror(cmd);
		exit(EXIT_FAILURE);
	}

	dup2(fds[1], STDOUT_FILENO);
	close(fds[0]);
	execlp(cmd, cmd, file, (char *)NULL);
	perror(cmd);
	exit(EXIT_FAILURE);
}