Initial commitHEADmaster

7 files changed, 1196 insertions, 0 deletions

diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..d0de56f
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so.  This is fundamentally incompatible with the aim of
+protecting users' freedom to change the software.  The systematic
+pattern of such abuse occurs in the area of products for individuals to
+use, which is precisely where it is most unacceptable.  Therefore, we
+have designed this version of the GPL to prohibit the practice for those
+products.  If such problems arise substantially in other domains, we
+stand ready to extend this provision to those domains in future versions
+of the GPL, as needed to protect the freedom of users.
+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
+software on general-purpose computers, but in those that do, we wish to
+avoid the special danger that patents applied to a free program could
+make it effectively proprietary.  To prevent this, the GPL assures that
+patents cannot be used to render the program non-free.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
+  0. Definitions.
+
+  "This License" refers to version 3 of the GNU General Public License.
+
+  "Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
+
+  "The Program" refers to any copyrightable work licensed under this
+License.  Each licensee is addressed as "you".  "Licensees" and
+"recipients" may be individuals or organizations.
+
+  To "modify" a work means to copy from or adapt all or part of the work
+in a fashion requiring copyright permission, other than the making of an
+exact copy.  The resulting work is called a "modified version" of the
+earlier work or a work "based on" the earlier work.
+
+  A "covered work" means either the unmodified Program or a work based
+on the Program.
+
+  To "propagate" a work means to do anything with it that, without
+permission, would make you directly or secondarily liable for
+infringement under applicable copyright law, except executing it on a
+computer or modifying a private copy.  Propagation includes copying,
+distribution (with or without modification), making available to the
+public, and in some countries other activities as well.
+
+  To "convey" a work means any kind of propagation that enables other
+parties to make or receive copies.  Mere interaction with a user through
+a computer network, with no transfer of a copy, is not conveying.
+
+  An interactive user interface displays "Appropriate Legal Notices"
+to the extent that it includes a convenient and prominently visible
+feature that (1) displays an appropriate copyright notice, and (2)
+tells the user that there is no warranty for the work (except to the
+extent that warranties are provided), that licensees may convey the
+work under this License, and how to view a copy of this License.  If
+the interface presents a list of user commands or options, such as a
+menu, a prominent item in the list meets this criterion.
+
+  1. Source Code.
+
+  The "source code" for a work means the preferred form of the work
+for making modifications to it.  "Object code" means any non-source
+form of a work.
+
+  A "Standard Interface" means an interface that either is an official
+standard defined by a recognized standards body, or, in the case of
+interfaces specified for a particular programming language, one that
+is widely used among developers working in that language.
+
+  The "System Libraries" of an executable work include anything, other
+than the work as a whole, that (a) is included in the normal form of
+packaging a Major Component, but which is not part of that Major
+Component, and (b) serves only to enable use of the work with that
+Major Component, or to implement a Standard Interface for which an
+implementation is available to the public in source code form.  A
+"Major Component", in this context, means a major essential component
+(kernel, window system, and so on) of the specific operating system
+(if any) on which the executable work runs, or a compiler used to
+produce the work, or an object code interpreter used to run it.
+
+  The "Corresponding Source" for a work in object code form means all
+the source code needed to generate, install, and (for an executable
+work) run the object code and to modify the work, including scripts to
+control those activities.  However, it does not include the work's
+System Libraries, or general-purpose tools or generally available free
+programs which are used unmodified in performing those activities but
+which are not part of the work.  For example, Corresponding Source
+includes interface definition files associated with source files for
+the work, and the source code for shared libraries and dynamically
+linked subprograms that the work is specifically designed to require,
+such as by intimate data communication or control flow between those
+subprograms and other parts of the work.
+
+  The Corresponding Source need not include anything that users
+can regenerate automatically from other parts of the Corresponding
+Source.
+
+  The Corresponding Source for a work in source code form is that
+same work.
+
+  2. Basic Permissions.
+
+  All rights granted under this License are granted for the term of
+copyright on the Program, and are irrevocable provided the stated
+conditions are met.  This License explicitly affirms your unlimited
+permission to run the unmodified Program.  The output from running a
+covered work is covered by this License only if the output, given its
+content, constitutes a covered work.  This License acknowledges your
+rights of fair use or other equivalent, as provided by copyright law.
+
+  You may make, run and propagate covered works that you do not
+convey, without conditions so long as your license otherwise remains
+in force.  You may convey covered works to others for the sole purpose
+of having them make modifications exclusively for you, or provide you
+with facilities for running those works, provided that you comply with
+the terms of this License in conveying all material for which you do
+not control copyright.  Those thus making or running the covered works
+for you must do so exclusively on your behalf, under your direction
+and control, on terms that prohibit them from making any copies of
+your copyrighted material outside their relationship with you.
+
+  Conveying under any other circumstances is permitted solely under
+the conditions stated below.  Sublicensing is not allowed; section 10
+makes it unnecessary.
+
+  3. Protecting Users' Legal Rights From Anti-Circumvention Law.
+
+  No covered work shall be deemed part of an effective technological
+measure under any applicable law fulfilling obligations under article
+11 of the WIPO copyright treaty adopted on 20 December 1996, or
+similar laws prohibiting or restricting circumvention of such
+measures.
+
+  When you convey a covered work, you waive any legal power to forbid
+circumvention of technological measures to the extent such circumvention
+is effected by exercising rights under this License with respect to
+the covered work, and you disclaim any intention to limit operation or
+modification of the work as a means of enforcing, against the work's
+users, your or third parties' legal rights to forbid circumvention of
+technological measures.
+
+  4. Conveying Verbatim Copies.
+
+  You may convey verbatim copies of the Program's source code as you
+receive it, in any medium, provided that you conspicuously and
+appropriately publish on each copy an appropriate copyright notice;
+keep intact all notices stating that this License and any
+non-permissive terms added in accord with section 7 apply to the code;
+keep intact all notices of the absence of any warranty; and give all
+recipients a copy of this License along with the Program.
+
+  You may charge any price or no price for each copy that you convey,
+and you may offer support or warranty protection for a fee.
+
+  5. Conveying Modified Source Versions.
+
+  You may convey a work based on the Program, or the modifications to
+produce it from the Program, in the form of source code under the
+terms of section 4, provided that you also meet all of these conditions:
+
+    a) The work must carry prominent notices stating that you modified
+    it, and giving a relevant date.
+
+    b) The work must carry prominent notices stating that it is
+    released under this License and any conditions added under section
+    7.  This requirement modifies the requirement in section 4 to
+    "keep intact all notices".
+
+    c) You must license the entire work, as a whole, under this
+    License to anyone who comes into possession of a copy.  This
+    License will therefore apply, along with any applicable section 7
+    additional terms, to the whole of the work, and all its parts,
+    regardless of how they are packaged.  This License gives no
+    permission to license the work in any other way, but it does not
+    invalidate such permission if you have separately received it.
+
+    d) If the work has interactive user interfaces, each must display
+    Appropriate Legal Notices; however, if the Program has interactive
+    interfaces that do not display Appropriate Legal Notices, your
+    work need not make them do so.
+
+  A compilation of a covered work with other separate and independent
+works, which are not by their nature extensions of the covered work,
+and which are not combined with it such as to form a larger program,
+in or on a volume of a storage or distribution medium, is called an
+"aggregate" if the compilation and its resulting copyright are not
+used to limit the access or legal rights of the compilation's users
+beyond what the individual works permit.  Inclusion of a covered work
+in an aggregate does not cause this License to apply to the other
+parts of the aggregate.
+
+  6. Conveying Non-Source Forms.
+
+  You may convey a covered work in object code form under the terms
+of sections 4 and 5, provided that you also convey the
+machine-readable Corresponding Source under the terms of this License,
+in one of these ways:
+
+    a) Convey the object code in, or embodied in, a physical product
+    (including a physical distribution medium), accompanied by the
+    Corresponding Source fixed on a durable physical medium
+    customarily used for software interchange.
+
+    b) Convey the object code in, or embodied in, a physical product
+    (including a physical distribution medium), accompanied by a
+    written offer, valid for at least three years and valid for as
+    long as you offer spare parts or customer support for that product
+    model, to give anyone who possesses the object code either (1) a
+    copy of the Corresponding Source for all the software in the
+    product that is covered by this License, on a durable physical
+    medium customarily used for software interchange, for a price no
+    more than your reasonable cost of physically performing this
+    conveying of source, or (2) access to copy the
+    Corresponding Source from a network server at no charge.
+
+    c) Convey individual copies of the object code with a copy of the
+    written offer to provide the Corresponding Source.  This
+    alternative is allowed only occasionally and noncommercially, and
+    only if you received the object code with such an offer, in accord
+    with subsection 6b.
+
+    d) Convey the object code by offering access from a designated
+    place (gratis or for a charge), and offer equivalent access to the
+    Corresponding Source in the same way through the same place at no
+    further charge.  You need not require recipients to copy the
+    Corresponding Source along with the object code.  If the place to
+    copy the object code is a network server, the Corresponding Source
+    may be on a different server (operated by you or a third party)
+    that supports equivalent copying facilities, provided you maintain
+    clear directions next to the object code saying where to find the
+    Corresponding Source.  Regardless of what server hosts the
+    Corresponding Source, you remain obligated to ensure that it is
+    available for as long as needed to satisfy these requirements.
+
+    e) Convey the object code using peer-to-peer transmission, provided
+    you inform other peers where the object code and Corresponding
+    Source of the work are being offered to the general public at no
+    charge under subsection 6d.
+
+  A separable portion of the object code, whose source code is excluded
+from the Corresponding Source as a System Library, need not be
+included in conveying the object code work.
+
+  A "User Product" is either (1) a "consumer product", which means any
+tangible personal property which is normally used for personal, family,
+or household purposes, or (2) anything designed or sold for incorporation
+into a dwelling.  In determining whether a product is a consumer product,
+doubtful cases shall be resolved in favor of coverage.  For a particular
+product received by a particular user, "normally used" refers to a
+typical or common use of that class of product, regardless of the status
+of the particular user or of the way in which the particular user
+actually uses, or expects or is expected to use, the product.  A product
+is a consumer product regardless of whether the product has substantial
+commercial, industrial or non-consumer uses, unless such uses represent
+the only significant mode of use of the product.
+
+  "Installation Information" for a User Product means any methods,
+procedures, authorization keys, or other information required to install
+and execute modified versions of a covered work in that User Product from
+a modified version of its Corresponding Source.  The information must
+suffice to ensure that the continued functioning of the modified object
+code is in no case prevented or interfered with solely because
+modification has been made.
+
+  If you convey an object code work under this section in, or with, or
+specifically for use in, a User Product, and the conveying occurs as
+part of a transaction in which the right of possession and use of the
+User Product is transferred to the recipient in perpetuity or for a
+fixed term (regardless of how the transaction is characterized), the
+Corresponding Source conveyed under this section must be accompanied
+by the Installation Information.  But this requirement does not apply
+if neither you nor any third party retains the ability to install
+modified object code on the User Product (for example, the work has
+been installed in ROM).
+
+  The requirement to provide Installation Information does not include a
+requirement to continue to provide support service, warranty, or updates
+for a work that has been modified or installed by the recipient, or for
+the User Product in which it has been modified or installed.  Access to a
+network may be denied when the modification itself materially and
+adversely affects the operation of the network or violates the rules and
+protocols for communication across the network.
+
+  Corresponding Source conveyed, and Installation Information provided,
+in accord with this section must be in a format that is publicly
+documented (and with an implementation available to the public in
+source code form), and must require no special password or key for
+unpacking, reading or copying.
+
+  7. Additional Terms.
+
+  "Additional permissions" are terms that supplement the terms of this
+License by making exceptions from one or more of its conditions.
+Additional permissions that are applicable to the entire Program shall
+be treated as though they were included in this License, to the extent
+that they are valid under applicable law.  If additional permissions
+apply only to part of the Program, that part may be used separately
+under those permissions, but the entire Program remains governed by
+this License without regard to the additional permissions.
+
+  When you convey a copy of a covered work, you may at your option
+remove any additional permissions from that copy, or from any part of
+it.  (Additional permissions may be written to require their own
+removal in certain cases when you modify the work.)  You may place
+additional permissions on material, added by you to a covered work,
+for which you have or can give appropriate copyright permission.
+
+  Notwithstanding any other provision of this License, for material you
+add to a covered work, you may (if authorized by the copyright holders of
+that material) supplement the terms of this License with terms:
+
+    a) Disclaiming warranty or limiting liability differently from the
+    terms of sections 15 and 16 of this License; or
+
+    b) Requiring preservation of specified reasonable legal notices or
+    author attributions in that material or in the Appropriate Legal
+    Notices displayed by works containing it; or
+
+    c) Prohibiting misrepresentation of the origin of that material, or
+    requiring that modified versions of such material be marked in
+    reasonable ways as different from the original version; or
+
+    d) Limiting the use for publicity purposes of names of licensors or
+    authors of the material; or
+
+    e) Declining to grant rights under trademark law for use of some
+    trade names, trademarks, or service marks; or
+
+    f) Requiring indemnification of licensors and authors of that
+    material by anyone who conveys the material (or modified versions of
+    it) with contractual assumptions of liability to the recipient, for
+    any liability that these contractual assumptions directly impose on
+    those licensors and authors.
+
+  All other non-permissive additional terms are considered "further
+restrictions" within the meaning of section 10.  If the Program as you
+received it, or any part of it, contains a notice stating that it is
+governed by this License along with a term that is a further
+restriction, you may remove that term.  If a license document contains
+a further restriction but permits relicensing or conveying under this
+License, you may add to a covered work material governed by the terms
+of that license document, provided that the further restriction does
+not survive such relicensing or conveying.
+
+  If you add terms to a covered work in accord with this section, you
+must place, in the relevant source files, a statement of the
+additional terms that apply to those files, or a notice indicating
+where to find the applicable terms.
+
+  Additional terms, permissive or non-permissive, may be stated in the
+form of a separately written license, or stated as exceptions;
+the above requirements apply either way.
+
+  8. Termination.
+
+  You may not propagate or modify a covered work except as expressly
+provided under this License.  Any attempt otherwise to propagate or
+modify it is void, and will automatically terminate your rights under
+this License (including any patent licenses granted under the third
+paragraph of section 11).
+
+  However, if you cease all violation of this License, then your
+license from a particular copyright holder is reinstated (a)
+provisionally, unless and until the copyright holder explicitly and
+finally terminates your license, and (b) permanently, if the copyright
+holder fails to notify you of the violation by some reasonable means
+prior to 60 days after the cessation.
+
+  Moreover, your license from a particular copyright holder is
+reinstated permanently if the copyright holder notifies you of the
+violation by some reasonable means, this is the first time you have
+received notice of violation of this License (for any work) from that
+copyright holder, and you cure the violation prior to 30 days after
+your receipt of the notice.
+
+  Termination of your rights under this section does not terminate the
+licenses of parties who have received copies or rights from you under
+this License.  If your rights have been terminated and not permanently
+reinstated, you do not qualify to receive new licenses for the same
+material under section 10.
+
+  9. Acceptance Not Required for Having Copies.
+
+  You are not required to accept this License in order to receive or
+run a copy of the Program.  Ancillary propagation of a covered work
+occurring solely as a consequence of using peer-to-peer transmission
+to receive a copy likewise does not require acceptance.  However,
+nothing other than this License grants you permission to propagate or
+modify any covered work.  These actions infringe copyright if you do
+not accept this License.  Therefore, by modifying or propagating a
+covered work, you indicate your acceptance of this License to do so.
+
+  10. Automatic Licensing of Downstream Recipients.
+
+  Each time you convey a covered work, the recipient automatically
+receives a license from the original licensors, to run, modify and
+propagate that work, subject to this License.  You are not responsible
+for enforcing compliance by third parties with this License.
+
+  An "entity transaction" is a transaction transferring control of an
+organization, or substantially all assets of one, or subdividing an
+organization, or merging organizations.  If propagation of a covered
+work results from an entity transaction, each party to that
+transaction who receives a copy of the work also receives whatever
+licenses to the work the party's predecessor in interest had or could
+give under the previous paragraph, plus a right to possession of the
+Corresponding Source of the work from the predecessor in interest, if
+the predecessor has it or can get it with reasonable efforts.
+
+  You may not impose any further restrictions on the exercise of the
+rights granted or affirmed under this License.  For example, you may
+not impose a license fee, royalty, or other charge for exercise of
+rights granted under this License, and you may not initiate litigation
+(including a cross-claim or counterclaim in a lawsuit) alleging that
+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
+
+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
+consequence of further modification of the contributor version.  For
+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
+this License.
+
+  Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
+make, use, sell, offer for sale, import and otherwise run, modify and
+propagate the contents of its contributor version.
+
+  In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement).  To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    autotag
+    Copyright (C) 2020  Thomas Albers Raviola
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    autotag  Copyright (C) 2020  Thomas Albers Raviola
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..b010827
--- /dev/null
+++ b/README.md
@@ -0,0 +1,30 @@
+# autotag
+
+Uses metadata from musicbrainz.org to fill song files with
+the tags of a given album.
+
+Thomas Albers Raviola <thomas@thomaslabs.org>
+
+## Usage
+
+`autotag [OPTION...] [DIRECTORY... | FILE...]`
+
+### Examples
+
+- `autotag --artist=<ARTIST> -A <ALBUM>` Assume that the directory working on has the same name as `<ALBUM>`
+
+
+### Options
+```
+    --artist=ARTIST        improve search results by providing an artist
+-A, --album=ALBUM          name of the album the files belong to
+-o, --order                ignore file names and assume that files are in order
+                           (useful for ripped CDs)
+-q, --quiet                do not output operations being done
+-h, --help                 show help options
+```
+
+## License
+
+GPL-3.0
+
diff --git a/autotag.asd b/autotag.asd
new file mode 100644
index 0000000..9dd4367
--- /dev/null
+++ b/autotag.asd
@@ -0,0 +1,19 @@
+(asdf:defsystem "autotag"
+  :description ""
+  :author ""
+  :license  ""
+  :version "0.0.1"
+  :serial t
+  :depends-on (:plump
+	       :babel
+	       :drakma
+	       :trivial-shell
+	       :split-sequence
+	       :alexandria
+	       :just-getopt-parser
+	       :osicat
+	       :str
+	       :cl-interpol)
+  :components ((:file "package")
+               (:file "db")
+               (:file "autotag")))
diff --git a/autotag.lisp b/autotag.lisp
new file mode 100755
index 0000000..2199203
--- /dev/null
+++ b/autotag.lisp
@@ -0,0 +1,187 @@
+;; autotag
+;; Copyright (C) 2020  Thomas Albers Raviola
+
+;; This program is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;; musicbrainz supported requests
+;; lookup:   /<ENTITY_TYPE>/<MBID>?inc=<INC>
+;; browse:   /<RESULT_ENTITY_TYPE>?<BROWSING_ENTITY_TYPE>=<MBID>&limit=<LIMIT>&offset=<OFFSET>&inc=<INC>
+;; search:   /<ENTITY_TYPE>?query=<QUERY>&limit=<LIMIT>&offset=<OFFSET>
+
+(in-package #:autotag)
+
+(defvar *path-replacements*
+  '(" " "_"
+    "/" "_"))
+
+(defvar *title-replacements*
+  '("…" "..."
+    "å" "a"
+    "’" "'"
+    "ö" "o"
+    "Ö" "O"
+    "ä" "a"
+    "Ä" "A"
+    "ü" "u"
+    "Ü" "U"))
+
+(defun release< (release1 release2)
+  (let ((t1 (release-title release1))
+	(t2 (release-title release2)))
+    (if (string-not-equal t1 t2)
+	(or (not (string-equal t1 *album-name*))
+	    (string-equal t2 *album-name*)
+	    (string> t1 t2))
+	(string< (release-date release1) (release-date release2)))))
+
+(defun select-release (release-list)
+  (flet ((printer (release)
+	   (format nil "artist: ~A~30Trelease: ~A~70Ttrack count: ~A~76Tdate: ~A"
+		   (release-artist release)
+		   (release-title release)
+		   (release-track-count release)
+		   (release-date release))))
+    (setf release-list (sort (copy-seq release-list) #'release<))
+    (dmenu release-list
+	   :lines (length release-list)
+	   :printer #'printer
+	   :prompt (format nil "~A (~A files):" *album-name* *npathnames*))))
+
+(defun tags-from-release (release)
+  (let ((global-tag `(:album ,(release-title release)
+		      :date ,(release-date release)
+		      :artist ,(release-artist release))))
+    (flet ((tag-from-track (tr)
+	     (apply #'make-tag
+		    `(:title ,(track-title tr)
+		      :track ,(track-position tr)
+		      :keywords ,(track-keywords tr)
+		      ,@global-tag))))
+      (mapcar #'tag-from-track (plump:get-elements-by-tag-name release "track")))))
+
+(defun choose-tag (pathname tags)
+  "Choose a tag for a given file, ask user if needed"
+  (let ((k1 (keywords (pathname-name pathname))))
+    (flet ((tag-printer (tag)
+	     (princ-to-string (tag-title tag)))
+	   (tag-key (tg)
+	     (let ((k2 (tag-keywords tg)))
+	       (/ (length (set-difference k2 k1 :test #'string-equal))
+		  (length k2)))))
+      (or (find (pathname-name pathname) tags
+                :key #'tag-title
+                :test #'string-equal)
+	  (progn (setf tags (sort (copy-seq tags) #'< :key #'tag-key))
+		 (dmenu tags
+			:printer #'tag-printer
+			:lines (length tags)
+			:prompt (pathname-name pathname)))))))
+
+(defun rename-file2 (pathname new-pathname)
+  (info "~&Renaming ~A to ~A~%" pathname new-pathname)
+  (rename-file pathname (concatenate 'string (pathname-name new-pathname)
+				     "." (pathname-type new-pathname))))
+
+(defun sanitize-pathname (pathname)
+  (str:replace-using
+   (append *path-replacements*
+	   *title-replacements*)
+   (remove-if #'(lambda (x)
+                  (member x '(#\? #\* #\{ #\} #\. #\?)))
+              pathname)))
+
+(defun apply-tag (pathname tag)
+  (unless tag
+    (info "~&No tag could be found for ~A, skipping ...~%" pathname)
+    (return-from apply-tag nil))
+  (when *rename-p*
+    (let ((new-pathname (make-pathname :directory (pathname-directory pathname)
+				       :name (sanitize-pathname (tag-title tag))
+				       :type (pathname-type pathname))))
+      (if (probe-file new-pathname)
+	  (info "~&File already exists, not renaming: ~A~%" new-pathname)
+	  (setf pathname (rename-file2 pathname new-pathname)))))
+  (info "~&Writing tags to: ~A~%" pathname)
+  (write-ogg-tags pathname tag))
+
+(defun apply-tags (pathnames tags)
+  (dolist (pathname pathnames)
+    (apply-tag pathname (choose-tag pathname tags))))
+
+(defun apply-tags-in-order (pathnames tags)
+  (flet ((tag-position-number (tr)
+	   (parse-integer (track-position tr))))
+    (setf tags (sort tags #'< :key #'tag-position-number))
+    (loop :for pathname :in pathnames
+	  :for tag :in tags
+	  :do
+	     (apply-tag pathname tag))))
+
+(defun get-tags (title artist)
+  (let* ((release (select-release (search-release title artist))))
+    (cond (release
+	   (tags-from-release
+	    (lookup-release
+	     (plump:get-attribute release "id"))))
+	  (t
+	   (info "~&No release for ~A selected, skipping ...~%"
+		 *album-name*)
+	   nil))))
+
+(defun expand-directories (pathname)
+  (if (eq (osicat:file-kind pathname) :directory)
+      (osicat:list-directory pathname)
+      (list pathname)))
+
+(defun autotag (argv)
+  (multiple-value-bind (options files)
+      (getopt argv *valid-cmd-line-args*)
+    (when (assoc :help options)
+      (help))
+    (when (assoc :quiet options)
+      (setf *quiet-p* t))
+    (when (assoc :order options)
+      (setf *order-p* t))
+    (when (assoc :dont-rename options)
+      (setf *rename-p* nil))
+    (when (assoc :album options)
+      (setf *album-name* (assoc-value options :album)))
+    (when (assoc :artist options)
+      (setf *album-artist* (assoc-value options :artist)))
+    (when (assoc :id options)
+      (let ((release (select-release (search-release *album-artist* *album-name*))))
+	(princ (and release (plump:get-attribute release "id")))
+	(terpri)))
+    (let* ((pathnames (mappend #'expand-directories
+			       (if (null files)
+				   (list *album-name*)
+				   files)))
+	   (*npathnames* (length pathnames))
+	   (tags (if (assoc :use-id options)
+		     (tags-from-release
+		      (lookup-release (assoc-value options :use-id)))
+		     (get-tags *album-name* *album-artist*))))
+      (when tags
+	(cond (*order-p*
+	       (apply-tags-in-order pathnames tags))
+	      (*print-tags-p*
+	       (mapc #'print-tag tags))
+	      (t
+	       (apply-tags pathnames tags)))))))
+
+(defun main ()
+  (handler-case
+      (autotag (uiop:command-line-arguments))
+    (sb-sys:interactive-interrupt () (uiop:quit)))
+  (uiop:quit))
diff --git a/autotag.org b/autotag.org
new file mode 100644
index 0000000..41b50d1
--- /dev/null
+++ b/autotag.org
@@ -0,0 +1,29 @@
+* Autotag
+** The Objective
++ Given a list of files, a album name and/or an artist name, find the
+  most apropiate release and apply its tags to the files.
+
+** The Problems
++ musicbrainz stores a lot of metadata for each release
++ the structure of the metadata is not clear
++ metadata is not always available
+
+** Implementation
++ autotag searches for all releases with a given name and prompts the
+  user to select one using dmenu. The id is kept.
++ the relevant release is looked up using the kept id. We do this in
+  order to include extra metadata that is not included in a mb-search
++ The metadata relevant to the whole release is kept while the
+  metadata for each track is retreived
++ The metadata is joined together.
++ Metadata is applied to the song files, the user is prompted each
+  time a unambiguous selection cannot be made.
+
+** FIXME
++ Check for musicbrainz errors
+** Ideas
++ add tag stack to reuse tags, usefull for manual tagging
++ manually give autotag a release id, might be useful later
++ add -f 'artist,album,track, ...' to control tags, implement more tags
++ export tags to stdout instead of just writing them
++ write scripts
diff --git a/db.lisp b/db.lisp
new file mode 100644
index 0000000..a5a3147
--- /dev/null
+++ b/db.lisp
@@ -0,0 +1,103 @@
+(in-package #:autotag)
+
+(setf plump:*tag-dispatchers* plump:*xml-tags*)
+
+(defun get-child-element-by-tag (node tag-name)
+  "Finds the first child element with tag-name"
+  (find tag-name (plump:child-elements node)
+	:key #'plump:tag-name
+        :test #'equal))
+
+(defun get-child-element-text-by-tag (node tag-name)
+  (when-let* (elem (get-child-element-by-tag node tag-name))
+    (plump:text elem)))
+
+(defun get-child-elements-by-tag (node tag-name &key count)
+  "Finds all child element with tag-name"
+  (coerce (remove-if (curry #'string-not-equal tag-name)
+		     (plump:child-elements node)
+		     :count count
+                     :key #'plump:tag-name)
+	  'list))
+
+(defun get-elements-by-tag-path (node path)
+  (cond ((null path)
+	 nil)
+	((and (listp path) (rest path))
+	 (mappend (rcurry #'get-elements-by-tag-path (rest path))
+		  (get-child-elements-by-tag node (first path))))
+	(t
+	 (get-child-elements-by-tag node (if (consp path) (car path) path)))))
+
+(defun get-element-by-tag-path (node path)
+  (first (get-elements-by-tag-path node path)))
+
+(defvar *release-artist-path*
+  '("artist-credit" "name-credit" "artist" "name"))
+
+(defun keywords (string)
+  (mapcar #'(lambda (s)
+              (remove-if (complement #'alphanumericp) s))
+	  (split-sequence #\Space (string-upcase string))))
+
+(defun release-title (release)
+  (when-let* (elem (get-child-element-text-by-tag release "title"))
+    (str:replace-using *title-replacements* elem)))
+
+(defun release-date (release)
+  (let ((raw-date (get-child-element-text-by-tag release "date")))
+    (first (split-sequence #\- raw-date))))
+
+(defun release-artist (release)
+  (when-let* (elem (get-element-by-tag-path release *release-artist-path*))
+    (plump:text elem)))
+
+(defun release-track-count (release)
+  (when-let* (elem (get-element-by-tag-path release '("medium-list" "track-count")))
+    (plump:text elem)))
+
+(defun track-title (track)
+  (when-let* ((elem (first (plump:get-elements-by-tag-name track "title")))
+              (text (plump:text elem)))
+    (str:replace-using *title-replacements* text)))
+
+(defun track-position (track)
+  (get-child-element-text-by-tag track "position"))
+
+(defun track-keywords (track)
+  (keywords (track-title track)))
+
+(defun query (url parameters)
+  (plump:parse
+   (babel:octets-to-string
+    (drakma:http-request url :parameters parameters))))
+
+(defun mb-lookup (entity mbid &optional inc)
+  (query (concatenate 'string *database* entity "/" mbid)
+	 (when inc `(("inc" . ,inc)))))
+
+(defun mb-browse (entity browsing-entity mbid &optional limit offset inc)
+  (let (parameters)
+    (when limit (push (cons "limit" limit) parameters))
+    (when offset (push (cons "offset" offset) parameters))
+    (when inc (push (cons "inc" inc) parameters))
+    (push (cons browsing-entity mbid) parameters)
+    (query (concatenate 'string *database* entity) parameters)))
+
+(defun mb-search (entity value &key filters limit offset)
+  (let ((query (format nil "~A~{~*~:[~;~2:* AND ~A:\"~A\"~]~}" value filters))
+	(parameters nil))
+    (when offset (push (cons "offset" offset) parameters))
+    (when limit (push (cons "limit" limit) parameters))
+    (push (cons "query" query) parameters)
+    (query (concatenate 'string *database* entity) parameters)))
+
+(defun search-release (name &optional artist)
+  (let* ((root (mb-search "release" name :filters `("artist" ,artist)))
+	 (releases (plump:get-elements-by-tag-name root "release")))
+    (and releases (coerce releases 'list))))
+
+(defun lookup-release (id)
+  (first-elt (plump:get-elements-by-tag-name
+	      (mb-lookup "release" id "recordings+artists")
+	      "release")))
diff --git a/package.lisp b/package.lisp
new file mode 100644
index 0000000..d334845
--- /dev/null
+++ b/package.lisp
@@ -0,0 +1,154 @@
+(defpackage #:autotag
+  (:use #:cl
+        #:alexandria
+        #:split-sequence
+        #:just-getopt-parser)
+  (:export #:main))
+
+(in-package #:autotag)
+
+(cl-interpol:enable-interpol-syntax)
+
+(defparameter *quiet-p* nil
+  "Should autotag be quiet?")
+
+(defparameter *order-p* nil
+  "Apply tags in the same order as in release? (ignore name matching
+  or keywords)")
+
+(defparameter *rename-p* t
+  "Should files be renamed by default?")
+
+(defparameter *use-id-p* nil
+  "")
+
+(defparameter *print-tags-p* nil
+  "")
+
+(defvar *album-name* nil)
+(defvar *album-artist* nil)
+(defvar *npathnames* nil)
+
+(defvar *database* "https://musicbrainz.org/ws/2/")
+
+(defparameter *valid-cmd-line-args*
+  '(;;
+    (:artist "artist" :required)
+    ;;
+    (:album #\A :required)
+    (:album "album" :required)
+    ;;
+    (:order #\o)
+    (:order "order")
+    ;;
+    (:id #\i)
+    (:id "id")
+    ;;
+    (:use-id #\u :required)
+    (:use-id "use-id" :required)
+    ;;
+    (:print-tags #\p)
+    (:print-tags "print-tags")
+    ;;
+    (:dont-rename #\n)
+    (:dont-rename "dont-rename")
+    ;;
+    (:quiet #\q)
+    (:quiet "quiet")
+    ;;
+    (:help #\h)
+    (:help "help")))
+
+(defun chomp (string)
+  (if (and (string/= string "") (eql (last-elt string) #\Newline))
+      (subseq string 0 (1- (length string)))
+      string))
+
+(defun dmenu (options &key (printer #'princ-to-string) (lines 10) prompt text-output)
+  (let ((text-options (mapcar printer options)))
+    (multiple-value-bind (output error-output exit-status)
+	(trivial-shell:shell-command
+	 (format nil "dmenu~@[ -l '~A'~]~@[ -p \"~A\"~]"
+		 lines
+		 (str:replace-using '("\"" "\\\"" "$" "\\$") prompt))
+	 :input (format nil "~{~A~%~}" text-options))
+      (declare (ignore error-output exit-status))
+      (if text-output
+	  (chomp output)
+	  (let ((position (position (chomp output) text-options :test #'string=)))
+	    (and position (elt options position)))))))
+
+(defun info (control-string &rest format-arguments)
+  (unless *quiet-p*
+    (apply #'format t control-string format-arguments)))
+
+;; Tags used by this autotagger, each track has one instance of this
+;; struct
+(defstruct tag
+  (title "")
+  (album "")
+  (artist "")
+  (date "")
+  (track "")
+  (keywords nil))
+
+(defparameter *ogg-tags*
+  `((:title  "TITLE"       ,#'tag-title  ,#'(setf tag-title))
+    (:artist "ARTIST"      ,#'tag-artist ,#'(setf tag-artist))
+    (:album  "ALBUM"       ,#'tag-album  ,#'(setf tag-album))
+    (:date   "DATE"        ,#'tag-date   ,#'(setf tag-date))
+    (:track  "TRACKNUMBER" ,#'tag-track  ,#'(setf tag-track))))
+
+;; (defun read-ogg-tags (pathname)
+;;   (flet ((ogg-field-reader (line)
+;; 	   (unless (string= line "")
+;; 	     (let* ((fields (split-sequence #\= line))
+;; 		    (name (car (rassoc (car fields) *ogg-tags*
+;; 				       :test #'string= :key #'first)))
+;; 		    (value (apply #'concatenate 'string (cdr fields))))
+;; 	       (list name value)))))
+;;     (read-tags (format nil "vorbiscomment -l ~A" pathname) #'ogg-field-reader)))
+
+(defun print-tag (tag)
+  (dolist (field *ogg-tags*)
+    (format t "~A=~A" (elt field 1) (funcall (elt field 2) tag))))
+
+(defun write-ogg-tags (pathname tag)
+  (trivial-shell:shell-command
+   (with-open-stream (stream (make-string-output-stream))
+     (format stream "vorbiscomment -w \"~A\"" pathname)
+     (loop :for (tag-name ogg-name reader writer) :in *ogg-tags*
+	   :for value = (funcall reader tag)
+	   :do
+	      (format stream " -t \"~A=~A\"" ogg-name value))
+     (get-output-stream-string stream))))
+
+(defun help ()
+  (format t #?|~&Usage: autotag [OPTION...] [DIRECTORY... \| FILE...]
+
+autotag - Uses metadata from musicbrainz.org to fill song files with
+the tags of a given album.
+
+Examples:
+
+Assume that the directory working on has the same name as <ALBUM>
+  autotag --artist=<ARTIST> -A <ALBUM>
+
+Options:
+      --artist=ARTIST    improve search results by providing an artist
+  -A, --album=ALBUM      name of the album the files belong to
+  -i, --id               get album id
+  -u, --use-id=ID        use ID as release id
+  -p, --print-tags       write tags to stdout instead of file
+  -o, --order            ignore file names and assume that files are in order
+                         (useful for ripped CDs)
+  -q, --quiet            do not output operations being done
+  -h, --help             show help options
+
+autotag
+Copyright (C) 2020 Thomas Albers Raviola <thomas@thomaslabs.org>
+This program comes with ABSOLUTELY NO WARRANTY.
+This is free software, and you are welcome to redistribute it
+under the terms of the GNU General Public License.
+|)
+  (uiop:quit))