char *xstrdup(const char *str);

char *
xstrdup(const char *str)
{
	char *ret = strdup(str);
	if (!ret)
		die("out of memory, strdup failed");
	return ret;
}

  'dir.c',

cmd_init(int argc, const char **argv)

cmd_init(int argc, const char **argv, const char *_ignore)

#ifndef ANI_DIR_H
#define ANI_DIR_H
/* Routines for working with directories */
int has_dotpijul(const char *); /* check if given directory has a .pijul */
/**
 * Search for a .pijul folder. Starts from the current working
 * directory, and walks up the parent directories until a directory is
 * found. If found, returns the absolute path (without "/.pijul" as an
 * allocated string. Otherwise, returns NULL
 */
char *find_dotpijul(void);
#endif

#include <unistd.h>
#include <stdio.h>
#include <sys/types.h>
#include <dirent.h>
#include <string.h>
#include "scaffold.h"
#include "dir.h"
int
has_dotpijul(const char *path)
{
	struct dirent *d;
	DIR *dir;
	int ret;
	ret = 0;
	if (!(dir = opendir(path)))
		return ret;
	while ((d = readdir(dir)) != NULL) {
		if (!strncmp(d->d_name, ".pijul", 6)) {
			ret = 1;
			break;
		}
	}
	closedir(dir);
	return ret;
}
#ifndef PATH_MAX
#define PATH_MAX 4096
#endif
char *
find_dotpijul()
{
	/**
	 * idea is this: set a string to current directory, check if
	 * ".pijul" is present - if not, cd("..") and look again.
	 */
	char path[PATH_MAX] = { 0 };
	char *s = NULL;
	int found = 0;
	if (!getcwd(path, PATH_MAX))
		die("unable to get current working directory");
	while (!(found = has_dotpijul(path)) && path != s) {
		s = strrchr(path, '/');
		*s = '\0';
	}
	if (!found)
		return NULL;
	s = xstrdup(path);
	return s;
}

cmd_change(int argc, char **argv)

cmd_change(int argc, char **argv, const char *pijul_dir)

#include "dir.h"

#define NEED_WORK_TREE (1 << 0)

	int (*fn)(int, const char **);

	int (*fn)(int, const char **, const char *);
	unsigned int flags;

	{ "init", cmd_init },
	{ "change", cmd_change },

	{ "init", cmd_init, 0 },
	{ "change", cmd_change, NEED_WORK_TREE },

	char *pijul_dir = NULL;

	return (command->fn)(argc, argv);

	if (command->flags & NEED_WORK_TREE) {
		pijul_dir = find_dotpijul();
		if (!pijul_dir)
			die("no Pijul repository found");
	}
	return (command->fn)(argc, argv, pijul_dir);