When handling bookmark, use readlink, not realpath

This is to cd to path as it pointed by symlink, not to it's real path. Bookmarked directory may itself contain symlinks in path, which should be respected.

For example: if directory is physically in /mnt/storage/some and it's symlinked to ~/some and directory ~/some/dir added to bookmarks, it's expected that when following bookmark directory will be changed to ~/some/dir (as in bookmark's link) not to /mnt/storage/some/dir (as dir real path).

src/nnn.c

@@ -1310,6 +1310,21 @@ static char *abspath(const char *filepath, char *cwd, char *buf)
 	return resolved_path;
 }
 
+/* finds abspath of link pointed by filepath, taking cwd into account */
+static char *bmtarget(const char *filepath, char *cwd, char *buf) 
+{
+	char target[PATH_MAX + 1];
+
+	int n = readlink(filepath, target, PATH_MAX);
+	if (n != -1) {
+		target[n] = '\0';
+
+		return abspath(target, cwd, buf);
+	} else {
+		return NULL;
+	}
+}
+
 /* wraps the argument in single quotes so it can be safely fed to shell */
 static bool shell_escape(char *output, size_t outlen, const char *s)
 {
@@ -7053,7 +7068,7 @@ static bool browse(char *ipath, const char *session, int pkey)
 
 			pent = &pdents[cur];
 			if (!g_state.selbm || !(S_ISLNK(pent->mode) &&
-			                        realpath(pent->name, newpath) &&
+			                        bmtarget(pent->name, path, newpath) &&
 			                        xstrsncpy(path, lastdir, PATH_MAX)))
 				mkpath(path, pent->name, newpath);
 			g_state.selbm = 0;