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FSDB is a simple file-based "database". It supports reads, writes, and directory listings of a file hierarchy, with thread-safe locking (when run from a single Lisp process with multiple threads). Based on the ideas of Patrick Chkoreff, which he has integrated into http://loom.cc/ Currently works in Clozure Common Lisp (CCL) and SBCL. Thanks to Nikodemus Siivola for the SBCL port. There are quite a few exported symbols, but you can do a lot with just the following: make-fsdb (dir &key (external-format :default)) Function ----- Make an FSDB instance based at the given DIR, which should be a path to a filesystem directory. EXTERNAL-FORMAT will be used for all the file opens. db-get ((db fsdb) key &rest more-keys) Method ----- Read the file at the offset KEY/MORE-KEYS... from DB's DIR. Return a string. (setf db-get) (value (db fsdb) key &rest more-keys) Method ----- Write VALUE, which must be a string, to the file at the offset KEY/MORE-KEYS... from DB's DIR. db-contents ((db fsdb) &rest keys) Method ----- Return a list of the names of all the files and directories at the offets KEYS... from DB's DIR. No paths will be in that list. Just strings naming the individual files and sub-directories. No indication is made of whether an element of the list is a file or a directory. db-dir-p ((db fsdb) &rest keys) Method ----- Return true if there is a file or directory at path KEYS... from DB's DIR and it is a directory.