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Clarify some behaviour, bringing schwarze@'s patch and mine closer together
(although I still don't have -M, which is a big piece).

First, the default search path is the cwd.  This will change to use -M
once I look over that code.

If MANPATH is specified, this replaces the cwd.

Both of these are augmented by -m.

If paths don't exist or don't have databases, they're silently ignored.
This makes perfect sense: you may be given a superset of possible paths.
The corner case of no paths (where, say, MANPATH consists of bogus paths
or the cwd is unreadable) simply means that no paths are searched.

/*	$Id: apropos.c,v 1.16 2011/11/20 16:29:50 kristaps Exp $ */
/*
 * Copyright (c) 2011 Kristaps Dzonsons <kristaps@bsd.lv>
 * Copyright (c) 2011 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.
 */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

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

#include "apropos_db.h"
#include "mandoc.h"

/*
 * List of paths to be searched for manual databases.
 */
struct	manpaths {
	int	  sz;
	char	**paths;
};

static	int	 cmp(const void *, const void *);
static	void	 list(struct res *, size_t, void *);
static	void	 manpath_add(struct manpaths *, const char *);
static	void	 manpath_parse(struct manpaths *, char *);
static	void	 usage(void);

static	char	*progname;

int
main(int argc, char *argv[])
{
	int		 i, ch, rc;
	struct manpaths	 paths;
	size_t		 terms;
	struct opts	 opts;
	struct expr	*e;
	extern int	 optind;
	extern char	*optarg;

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

	memset(&paths, 0, sizeof(struct manpaths));
	memset(&opts, 0, sizeof(struct opts));

	e = NULL;
	rc = 0;

	while (-1 != (ch = getopt(argc, argv, "m:S:s:"))) 
		switch (ch) {
		case ('m'):
			manpath_parse(&paths, optarg);
			break;
		case ('S'):
			opts.arch = optarg;
			break;
		case ('s'):
			opts.cat = optarg;
			break;
		default:
			usage();
			goto out;
		}

	argc -= optind;
	argv += optind;

	if (0 == argc) {
		rc = 1;
		goto out;
	}

	/*
	 * Let MANPATH override our default paths.
	 */

	if (NULL != getenv("MANPATH"))
		manpath_add(&paths, getenv("MANPATH"));
	else
		manpath_add(&paths, ".");

	if (NULL == (e = exprcomp(argc, argv, &terms))) {
		fprintf(stderr, "%s: Bad expression\n", progname);
		goto out;
	}

	rc = apropos_search
		(paths.sz, paths.paths, 
		 &opts, e, terms, NULL, list);

	if (0 == rc) 
		fprintf(stderr, "%s: Error reading "
				"manual database\n", progname);

out:
	for (i = 0; i < paths.sz; i++)
		free(paths.paths[i]);

	free(paths.paths);
	exprfree(e);

	return(rc ? EXIT_SUCCESS : EXIT_FAILURE);
}

/* ARGSUSED */
static void
list(struct res *res, size_t sz, void *arg)
{
	int		 i;

	qsort(res, sz, sizeof(struct res), cmp);

	for (i = 0; i < (int)sz; i++)
		printf("%s(%s%s%s) - %s\n", res[i].title, 
				res[i].cat, 
				*res[i].arch ? "/" : "",
				*res[i].arch ? res[i].arch : "",
				res[i].desc);
}

static int
cmp(const void *p1, const void *p2)
{

	return(strcmp(((const struct res *)p1)->title,
				((const struct res *)p2)->title));
}

static void
usage(void)
{

	fprintf(stderr, "usage: %s "
			"[-m dirs] "
			"[-S arch] "
			"[-s section] "
			"expression...\n", progname);
}

/*
 * Parse a FULL pathname from a colon-separated list of arrays.
 */
static void
manpath_parse(struct manpaths *dirs, char *path) 
{
	char	*dir;

	for (dir = strtok(path, ":"); dir; dir = strtok(NULL, ":"))
		manpath_add(dirs, dir);
}

/*
 * Add a directory to the array, ignoring bad directories.
 * Grow the array one-by-one for simplicity's sake.
 */
static void
manpath_add(struct manpaths *dirs, const char *dir) 
{
	char		 buf[PATH_MAX];
	char		*cp;

	if (NULL == (cp = realpath(dir, buf)))
		return;

	dirs->paths = mandoc_realloc
		(dirs->paths, 
		 ((size_t)dirs->sz + 1) * sizeof(char *));

	dirs->paths[dirs->sz++] = mandoc_strdup(cp);
}