589b737d43ed24d45417d4619b15ef6136bdad90 — Michael Rees 10 days ago
Simple method for paging long strings
8 files changed, 917 insertions(+), 0 deletions(-)

A .gitignore
A LICENSE
A README.md
A demo/long.txt
A demo/short.txt
A pager.nimble
A src/pager.nim
A src/pagerpkg/pager.nim
A  => .gitignore +1 -0
@@ 1,1 @@
+ bin

A  => LICENSE +674 -0
@@ 1,674 @@
+                     GNU GENERAL PUBLIC LICENSE
+                        Version 3, 29 June 2007
+ 
+  Copyright (C) 2007 Free Software Foundation, Inc. <https://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.
+ 
+     <one line to give the program's name and a brief idea of what it does.>
+     Copyright (C) <year>  <name of author>
+ 
+     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 <https://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:
+ 
+     <program>  Copyright (C) <year>  <name of author>
+     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
+ <https://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
+ <https://www.gnu.org/licenses/why-not-lgpl.html>.

A  => README.md +32 -0
@@ 1,32 @@
+ # nim-pager
+ 
+ A simple command line pager, written in [Nim](https://nim-lang.org). 
+ 
+ ## Usage
+ 
+ This project can be compiled into a binary using `nimble`. However, its primary use is as a library. In your project, use it as follows:
+ 
+ ```
+ import pager
+ 
+ # assign some long string to longString
+ page(longString)
+ ```
+ 
+ This will split the value of `longString` onto lines that can be stepped through with the following keys:
+ 
+ - `j`: down
+ - `k`: up
+ - `g`: go to top
+ - `G`: go to bottom
+ - `Ctrl-U`: go up one-half of the screen
+ - `Ctrl-D`: go down one-half of the screen
+ - `q`: quit
+ 
+ ## Project Goals
+ 
+ `pager` was written for [roman](https://git.sr.ht/~reesmichael1/roman), and currently only has the flexibility and features required for that task. However, any patches or requests for extension would be welcome!
+ 
+ ## Contributing
+ 
+ Contributions are welcome! Please send patches, questions, requests, etc. to my [public inbox](mailto:~reesmichael1/public-inbox@lists.sr.ht).

A  => demo/long.txt +100 -0
@@ 1,100 @@
+ Lorem ipsum dolor sit amet, consectetur adipiscing elit. Phasellus a pretium urna. Aliquam erat volutpat. Ut varius quam vel metus laoreet lacinia. Suspendisse ut nibh nisi. Aliquam interdum nulla sed nibh facilisis auctor. Pellentesque rutrum aliquet elit et faucibus. Proin sed nisl at quam porttitor ultrices ac tincidunt sapien. Mauris rhoncus id ipsum vulputate ullamcorper. Pellentesque suscipit, ligula non dictum fringilla, enim felis luctus quam, ut consectetur nisi lorem eu arcu. Proin tellus libero, gravida ut imperdiet vitae, pulvinar vitae arcu. Nunc congue augue at risus condimentum, id ornare orci ultricies. Nullam imperdiet felis id sodales faucibus.
+ 
+ Sed mollis tempus tortor. Etiam auctor lectus et facilisis malesuada. Mauris vitae ex consequat, viverra nisi in, rutrum felis. Nunc id nisl rhoncus, egestas turpis vitae, gravida magna. Donec vehicula sollicitudin massa, ut tincidunt lorem. Quisque malesuada turpis non efficitur feugiat. Fusce volutpat pharetra eros, a egestas quam elementum et. Praesent at odio diam. Nullam egestas, dolor quis porta cursus, nulla nulla maximus lectus, ac rhoncus purus purus et lectus. Maecenas hendrerit tellus sed tortor faucibus, a pellentesque lectus varius. Mauris tristique sem accumsan felis consectetur facilisis. Curabitur eget orci ex. Sed auctor condimentum leo quis sodales. Praesent ultrices libero eros, at vehicula massa aliquet eget. Fusce semper ullamcorper nulla at facilisis.
+ 
+ Nam tincidunt ultricies orci semper laoreet. Pellentesque justo lacus, mattis sit amet mauris nec, faucibus tempus leo. Ut sit amet convallis quam. Aliquam erat volutpat. Nulla commodo placerat urna. Praesent mollis elit odio, a mollis felis euismod ut. Ut dapibus mi eget dui ultricies, a condimentum enim semper. Aenean id sagittis lectus. Suspendisse at ex a odio faucibus pellentesque vitae in metus. Aliquam vitae diam mauris.
+ 
+ Integer at fringilla purus. Nam sed turpis in dui finibus tristique in eu lacus. Nullam et mi a urna egestas mattis. Etiam nec faucibus nulla. Nunc lorem augue, hendrerit quis rutrum nec, pharetra a ex. Praesent interdum tempor lectus, tristique feugiat ipsum elementum sit amet. In at consequat magna. Vivamus egestas quis libero sed porttitor. Etiam finibus sodales semper. Cras venenatis sapien vitae pretium euismod. Ut et velit ut ex feugiat vehicula in ac orci. Quisque vitae auctor diam, vel imperdiet augue. Cras augue enim, tristique sit amet luctus et, luctus nec augue. Cras vestibulum interdum nisi sit amet vulputate.
+ 
+ Nulla augue ante, finibus a metus sit amet, euismod tincidunt arcu. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Sed risus lectus, cursus fermentum venenatis dignissim, fringilla quis neque. Sed ut pharetra libero. In vestibulum maximus euismod. Quisque purus nunc, fringilla vel eros sit amet, feugiat mattis nunc. Morbi eu porta sapien, feugiat posuere augue. Proin aliquam vitae dolor vel condimentum. Donec vel purus consectetur, bibendum mauris ac, dapibus ex. Nulla vestibulum ligula velit, id finibus velit ornare ut. Cras eu elementum nisl. Vivamus cursus auctor tortor. Ut justo massa, pellentesque in hendrerit vitae, rutrum quis erat. Vivamus iaculis accumsan nibh a sodales.
+ 
+ Nam interdum nibh vel tellus bibendum, quis tincidunt nisi scelerisque. Praesent viverra nibh sagittis elit consequat feugiat. Nullam sit amet mattis mauris, a elementum enim. Vestibulum pellentesque, felis id vehicula congue, orci tellus malesuada metus, ut fringilla mauris mauris sed magna. Nunc fermentum nunc a congue mattis. Donec rhoncus vehicula enim. Nulla mollis dui ut libero mattis elementum. Mauris sit amet libero finibus, laoreet tortor a, consequat nunc. Vestibulum tincidunt at diam id iaculis. Morbi lobortis nunc at euismod fringilla. Donec iaculis tellus leo, vitae tempus enim malesuada nec. Maecenas vitae magna quis erat dignissim convallis vitae eu orci. Sed sit amet blandit neque. Maecenas a urna non augue vestibulum laoreet sed quis libero. Maecenas non elit aliquet, dignissim erat id, accumsan neque. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos.
+ 
+ Sed vehicula luctus sapien, at euismod augue dignissim a. In efficitur lectus sed diam euismod congue. Etiam a posuere mauris. Nunc maximus enim id hendrerit tincidunt. Phasellus nec felis euismod, rhoncus arcu sit amet, venenatis erat. Vestibulum et dui sit amet arcu dictum viverra et ac felis. Orci varius natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Sed diam enim, pharetra eget finibus quis, pharetra eu nunc. Suspendisse dui felis, eleifend nec dapibus sit amet, cursus sed turpis. Mauris at auctor augue. Donec fermentum ullamcorper tempor.
+ 
+ Nam blandit ipsum euismod libero porttitor, id hendrerit ante vehicula. Curabitur aliquet ex tortor, eu placerat ipsum commodo et. Maecenas tempus purus vel elit vehicula pellentesque. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Duis efficitur dolor leo, non hendrerit tellus mollis a. Pellentesque malesuada tempus tellus. Nunc nec est hendrerit, ullamcorper dui sagittis, dapibus massa. Integer bibendum sed quam eu aliquam. Duis vel lorem vel ante sodales porta eget quis dolor. Proin vel tortor sem.
+ 
+ Vestibulum urna elit, dapibus a felis vel, convallis blandit sapien. Vivamus malesuada sapien vel ex condimentum bibendum. Nulla ut facilisis ligula, sit amet feugiat nisl. Donec erat eros, laoreet in fermentum vel, venenatis nec dolor. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Etiam hendrerit leo quis elit scelerisque, quis facilisis diam fermentum. Aenean sit amet lectus auctor leo blandit efficitur.
+ 
+ Cras vestibulum odio porta leo vulputate, eu gravida orci accumsan. Vestibulum a dui sit amet lacus maximus maximus nec sit amet lacus. Maecenas et porttitor diam. Pellentesque accumsan auctor augue id ornare. Suspendisse a efficitur nibh. Phasellus ac neque purus. Etiam non augue scelerisque, accumsan ex sit amet, accumsan ligula. Sed placerat pretium ligula sed pellentesque.
+ 
+ Morbi tempus sagittis congue. Fusce nec metus vel leo tincidunt viverra sit amet in odio. Donec aliquet et eros id luctus. Mauris mattis leo imperdiet neque tincidunt laoreet. Orci varius natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Nunc vulputate volutpat sapien, sed cursus neque. Sed sed convallis mauris. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Donec ac risus leo. Integer maximus, urna sed pharetra ultricies, lacus enim tincidunt nisl, in facilisis magna nunc quis libero. Lorem ipsum dolor sit amet, consectetur adipiscing elit.
+ 
+ Etiam congue lacus nec ipsum tempus sollicitudin. Quisque efficitur tortor eu turpis maximus eleifend. Ut non erat id arcu ullamcorper placerat. Duis enim ex, auctor id turpis in, euismod porttitor elit. Pellentesque vel nibh eros. Proin in ligula at felis ullamcorper dapibus eget sed dui. Cras et egestas arcu. Proin ullamcorper enim ac quam euismod volutpat. Fusce sed mi mattis, posuere ex nec, condimentum turpis. Suspendisse scelerisque mi in ipsum commodo, id ullamcorper nisi pharetra. Sed enim libero, rhoncus ut risus et, vulputate aliquam orci. Vivamus quis malesuada elit, eget tincidunt eros. Integer tristique, sem et hendrerit condimentum, sapien quam lobortis felis, eget dapibus dolor urna et mi. Integer ultricies sagittis venenatis.
+ 
+ Maecenas et porta mi, sed aliquet lacus. Vivamus vehicula, nisi quis mollis aliquam, ipsum metus commodo felis, non sagittis sapien ligula ac mauris. Ut consequat blandit orci, vitae pretium metus sodales sed. Fusce fermentum ullamcorper arcu, nec consequat est fermentum in. Vivamus semper sem sed ante sagittis, sit amet volutpat arcu fringilla. Nullam elementum laoreet felis, non malesuada nibh condimentum feugiat. Donec sagittis neque hendrerit lectus volutpat semper. Maecenas sagittis, elit sit amet ultrices faucibus, libero massa gravida justo, condimentum ultrices nibh lectus ut urna. Sed nec ipsum vestibulum, pulvinar eros vitae, fringilla erat. Vestibulum tortor nunc, malesuada vitae convallis pretium, consectetur nec ligula. In pretium ac nulla aliquam dictum. Integer id consectetur arcu.
+ 
+ Donec ut dui erat. Nunc faucibus urna ut libero ullamcorper, vel pharetra tellus vehicula. Vivamus mattis urna porttitor luctus sagittis. Vivamus viverra imperdiet velit ultrices bibendum. Mauris quam nunc, eleifend ut ipsum non, ullamcorper pellentesque lorem. Aenean nisi erat, convallis ac odio vel, vulputate accumsan nunc. Donec facilisis enim eget mi finibus vulputate. Ut aliquam pharetra metus, vitae lacinia felis pulvinar sit amet. Donec sollicitudin tempor elit, sed condimentum nulla rutrum ut.
+ 
+ Etiam congue ante a purus fringilla rutrum. Phasellus ornare mollis velit, sit amet placerat erat elementum efficitur. Fusce cursus neque at nisl porta auctor sit amet ut diam. Donec ac ornare leo, vitae vehicula nisi. Sed sit amet nunc velit. Nulla auctor rutrum ipsum, dapibus egestas ipsum tempus eget. Vivamus aliquam magna magna. Curabitur convallis magna vel molestie egestas. Nulla finibus pretium est, non ultrices libero finibus sed. Mauris pellentesque dictum enim, sit amet sagittis arcu venenatis et. Interdum et malesuada fames ac ante ipsum primis in faucibus. Nulla facilisi. Mauris aliquam imperdiet arcu sit amet maximus. Phasellus vel lacinia sapien.
+ 
+ Ut pulvinar commodo dolor, quis eleifend nibh bibendum quis. Curabitur vestibulum id mauris vitae faucibus. Duis dolor dolor, pellentesque sit amet nisi eget, lobortis blandit enim. Proin sed nibh ac eros posuere tristique condimentum et lacus. Integer at tortor fringilla, sagittis ex non, auctor mi. Ut facilisis mi orci, sed pretium lectus euismod in. Aliquam sit amet cursus tortor. Nam pharetra, sapien eu imperdiet eleifend, erat arcu venenatis nulla, in scelerisque enim leo nec ex. Suspendisse non dictum lacus, eget porta ex. Sed consequat scelerisque felis, placerat elementum sapien feugiat eget.
+ 
+ Sed consequat elit sed nisi maximus, eu pulvinar est tempus. Suspendisse finibus a mauris quis fringilla. Donec volutpat ultricies ante, in mollis ex volutpat a. Suspendisse vitae erat sodales, interdum neque vel, posuere tortor. Cras ac lacus iaculis velit sagittis posuere a eu neque. Curabitur eu felis ipsum. Phasellus ornare lorem in condimentum porttitor.
+ 
+ Nulla non justo viverra, consequat enim ut, vulputate eros. Morbi ornare, risus quis ultrices efficitur, lorem lorem interdum elit, ac posuere ligula leo id tellus. Nam volutpat semper lectus. Cras varius est non velit faucibus convallis. Etiam vel nulla quam. Nulla porttitor ipsum nulla, id dictum leo blandit eget. Suspendisse lacinia libero ut commodo fermentum. Fusce feugiat vulputate eros sed venenatis. Morbi laoreet eros ex, et molestie arcu placerat sit amet.
+ 
+ Nam justo lacus, tempor sed arcu non, auctor imperdiet eros. Praesent laoreet non purus et pretium. Nunc a dolor in enim elementum egestas quis quis enim. Integer vulputate ac sapien non ullamcorper. Sed tellus justo, tristique ut auctor vitae, consectetur ut libero. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Integer placerat diam et ipsum gravida, at hendrerit dolor volutpat. Curabitur sit amet commodo velit, et euismod risus. Donec porttitor consequat lacus, sed ullamcorper ligula porttitor ut. Nunc venenatis auctor sapien quis varius. Donec ut ligula facilisis massa faucibus sagittis. Proin tincidunt risus ante, vitae maximus quam malesuada nec. Proin condimentum ac odio at semper. Ut sit amet ligula quis quam mollis malesuada vel in risus.
+ 
+ Proin quam felis, posuere a elementum a, suscipit eget diam. Nunc mattis urna interdum lacus accumsan, a volutpat nisi molestie. Quisque id velit fringilla, vulputate nulla id, cursus diam. Vivamus non ex pulvinar, pulvinar diam ac, imperdiet enim. Mauris molestie et lacus et rhoncus. Curabitur eget vehicula dui. Nulla porta, urna eget vestibulum posuere, felis justo dictum libero, sed bibendum ligula ante malesuada leo. Integer ut mi facilisis, scelerisque quam vitae, cursus lectus. Praesent eu magna lobortis, placerat nisl id, accumsan leo.
+ 
+ Vestibulum condimentum nibh in tincidunt varius. Proin eu sapien augue. Morbi gravida lorem non elit sollicitudin eleifend. Aenean porta et nisi eget fermentum. Aliquam erat volutpat. Donec varius cursus metus ut sollicitudin. Donec at tincidunt enim. Fusce vestibulum aliquam tellus et pretium. Nulla euismod sapien at turpis tristique, aliquet porta dui elementum. Aliquam ut velit quam. Fusce lacinia, turpis quis rutrum lacinia, eros libero fermentum nibh, at congue tortor mi ut est. Morbi quis massa bibendum mi accumsan placerat. Sed ex odio, feugiat non placerat eu, bibendum sed justo. Sed viverra, risus ut cursus commodo, nulla justo pulvinar lacus, nec efficitur erat mi et elit.
+ 
+ Etiam posuere, velit at egestas venenatis, leo est maximus nunc, id egestas ex dolor vitae massa. Phasellus sodales enim id tempor pulvinar. Suspendisse lacus eros, interdum vitae neque a, congue accumsan turpis. Praesent nec sagittis nunc, eget luctus ex. Quisque scelerisque neque eu justo dapibus, sed molestie erat egestas. Phasellus maximus tempus ante, quis interdum dolor sollicitudin vitae. Suspendisse potenti. Aliquam fermentum ipsum vitae iaculis tincidunt. Proin varius nec purus nec sodales. In sit amet neque purus. Donec scelerisque purus sed augue pulvinar, iaculis vestibulum nunc ullamcorper. Sed at leo leo. In vitae purus nisi. Aliquam feugiat vulputate mauris et hendrerit. Nullam posuere euismod dignissim. Mauris fringilla scelerisque justo iaculis suscipit.
+ 
+ Sed convallis enim purus, ac tristique magna iaculis a. In eu lorem dapibus, bibendum augue in, interdum nulla. Nunc nisi lectus, maximus ac sapien eget, rutrum dictum nisi. Maecenas dictum nisi ac aliquam ullamcorper. Phasellus viverra eleifend lorem, non commodo odio ullamcorper at. Duis sit amet vulputate sapien. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Morbi vel tortor augue. Fusce maximus faucibus neque eu interdum. Aenean in vulputate mauris, eu pharetra turpis. Integer enim metus, efficitur eu malesuada et, venenatis vitae arcu. Aliquam erat volutpat. Suspendisse fringilla ultricies orci, vel finibus purus sollicitudin vitae. In et lorem non ipsum scelerisque malesuada. Praesent quis tincidunt ligula. Quisque placerat elit in libero placerat pulvinar eu eget odio.
+ 
+ Nullam pretium metus laoreet, tincidunt tellus sed, suscipit enim. In sed commodo purus, semper tincidunt enim. Nulla tincidunt accumsan arcu, at volutpat dui vulputate vitae. Vivamus cursus ipsum tellus, et eleifend orci luctus et. Curabitur tortor velit, finibus non fermentum elementum, venenatis nec arcu. Vivamus non turpis eu odio luctus vestibulum et nec nibh. Aliquam erat volutpat. Cras convallis nisi commodo, pulvinar augue eget, hendrerit lorem. Fusce consectetur lobortis nisl ut scelerisque. Proin turpis risus, auctor ut urna eu, efficitur blandit risus. Suspendisse pretium, velit eu ultricies tempus, est sapien fermentum risus, non consectetur mauris eros vel nunc. Pellentesque ut nisl sed risus dignissim aliquam in sed ligula. Sed mattis, lacus at scelerisque interdum, magna enim ultricies ante, eget pellentesque orci neque cursus nisi. Phasellus at lacus at neque scelerisque tristique. Phasellus tincidunt dictum leo quis placerat.
+ 
+ Etiam commodo justo ut consequat interdum. Aliquam erat volutpat. Quisque eget leo justo. Ut vitae ante ornare enim lacinia cursus. Suspendisse finibus nisi lorem. Vivamus vulputate dui vitae tellus condimentum, eu auctor libero cursus. Nullam accumsan congue accumsan. Sed vitae justo a felis tincidunt porttitor ac vitae metus. Donec a felis volutpat, malesuada ipsum euismod, aliquam nisl. Morbi id ex porttitor, tempor lorem vitae, consequat libero. Suspendisse vel dui et ante luctus malesuada. Etiam id lacus sed leo facilisis malesuada sed nec velit. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Etiam pharetra dapibus augue, quis aliquam eros suscipit nec.
+ 
+ Pellentesque pulvinar porttitor congue. Donec lobortis quam in quam blandit aliquam. Suspendisse eget elit in lectus fermentum pharetra sit amet id justo. Nam varius quis massa condimentum porttitor. In hac habitasse platea dictumst. Morbi eu leo lacus. Nunc sollicitudin odio lacus, nec accumsan massa vulputate at. Sed in dolor massa. Cras eu velit augue. Sed viverra vel quam eu hendrerit. Praesent ac nunc et arcu pharetra maximus. Nunc aliquam sapien lorem, ac auctor lorem dictum id. Nullam vulputate interdum ipsum, sed fringilla velit sollicitudin sit amet.
+ 
+ Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Cras iaculis sapien odio, a suscipit enim tincidunt ac. Fusce in augue quis nisi placerat maximus at ut ante. Donec in odio rutrum sem pretium bibendum. Curabitur non nibh purus. Donec rhoncus quis metus id viverra. Sed sed cursus velit. Phasellus sit amet sapien gravida, eleifend sem non, feugiat est. Morbi purus justo, varius nec ante eget, lobortis efficitur libero. Ut condimentum molestie congue. Mauris vulputate massa a nunc pellentesque, a rhoncus est finibus. Vivamus eget sollicitudin velit. Curabitur a dictum dui. Nunc sed porta dolor, non mollis elit. Duis ac sodales massa.
+ 
+ Pellentesque venenatis ex ac rutrum laoreet. Fusce justo orci, tristique eget commodo placerat, dictum a nibh. Phasellus maximus dui non velit placerat eleifend. Fusce enim magna, commodo in dapibus nec, aliquet vitae erat. Aenean mollis, lectus quis convallis tempor, magna turpis sollicitudin diam, eget ornare velit turpis sit amet sapien. Nullam id purus vestibulum, condimentum nisl gravida, tincidunt mauris. Aenean rhoncus elit libero, nec vulputate enim aliquet a. Pellentesque euismod malesuada velit, et mattis tortor vulputate eget. Ut blandit libero id euismod sagittis. In eget bibendum lectus, nec congue enim. Donec imperdiet erat leo, a viverra augue tincidunt quis. Vivamus sollicitudin maximus augue, at pharetra nisi. Quisque leo lacus, ultricies non porta commodo, semper et sapien. Phasellus ut nibh pulvinar, pellentesque ante quis, finibus mi. Fusce porta elementum ipsum eu sodales.
+ 
+ Nulla fermentum diam in condimentum elementum. Quisque sagittis, est vel luctus semper, sapien leo aliquam sem, sit amet ultricies turpis risus a magna. Quisque efficitur nec orci eget rutrum. Morbi arcu erat, sodales non ante eu, laoreet consectetur sem. Suspendisse nisi felis, blandit interdum lectus eu, accumsan ullamcorper lorem. Suspendisse eget nunc dui. Etiam augue justo, tempor ut diam nec, varius rutrum odio. Nunc sodales turpis ullamcorper mi sollicitudin efficitur. Fusce hendrerit metus nec ipsum facilisis, eget tincidunt tellus molestie. Nullam ut quam vitae nulla mollis laoreet ac eget quam. Nullam eleifend neque at maximus euismod. Donec eget elit finibus, dapibus nulla vitae, laoreet arcu. Duis non tristique leo.
+ 
+ Quisque porttitor nulla id dui ultrices, eget tincidunt erat elementum. Suspendisse vitae viverra ligula. Sed ultricies a nisi at feugiat. Nulla quis justo rutrum felis maximus scelerisque sed ac tortor. Cras tristique felis a elit malesuada ultrices. Proin mattis orci quis magna bibendum, euismod semper nulla lobortis. Duis non pulvinar ipsum. Mauris vehicula vel mauris sed fringilla. Suspendisse auctor erat sed urna porta sagittis vitae tempor est. Mauris id dictum neque. Vivamus sagittis mauris eget sem rutrum lacinia. Phasellus massa magna, rhoncus a nulla in, accumsan cursus orci.
+ 
+ Praesent maximus faucibus felis nec laoreet. Donec varius facilisis tempor. Sed et lectus felis. Suspendisse mollis quis elit quis venenatis. Maecenas egestas blandit neque. Nunc interdum bibendum ornare. Sed elementum, dolor a faucibus rutrum, metus tortor mollis magna, quis posuere urna mi sed justo. Nulla at diam nec mauris porta efficitur. Interdum et malesuada fames ac ante ipsum primis in faucibus. Sed vestibulum blandit erat, quis malesuada justo malesuada et. Mauris eu placerat erat.
+ 
+ Proin sed semper leo. Cras consequat, lectus a vehicula sagittis, diam mi finibus ligula, vel egestas sem turpis eget elit. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Pellentesque pharetra maximus eleifend. Ut dictum dui nec dui lobortis ultrices a quis ipsum. In hac habitasse platea dictumst. Quisque eget diam dapibus, sagittis orci sed, lobortis nibh. Donec est libero, finibus ut orci sed, porttitor egestas mauris. Suspendisse potenti. Quisque cursus tristique odio, sit amet tempor nisl scelerisque ac. Mauris nec sapien mi. In eleifend accumsan interdum. Ut aliquet in mi a efficitur. Quisque eget enim faucibus, blandit nisi sit amet, venenatis ante. Morbi posuere dolor vitae massa venenatis posuere. Nunc elementum ultricies erat, eget interdum metus euismod ut.
+ 
+ Nulla facilisi. Maecenas volutpat auctor metus, sit amet sollicitudin nisl volutpat luctus. Pellentesque nec iaculis ipsum. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Nunc nisl augue, laoreet a facilisis et, semper quis leo. Sed varius feugiat quam, ac placerat est semper sit amet. In tortor turpis, lacinia at arcu eu, gravida ultricies ante. Fusce ornare porttitor quam sed imperdiet. Proin rhoncus tortor id lobortis malesuada. Aliquam ante orci, porttitor at sollicitudin et, cursus faucibus eros.
+ 
+ Quisque ac arcu ut nulla vulputate vestibulum vitae gravida turpis. Maecenas auctor turpis non fringilla posuere. Praesent eget nisl est. Nunc at sem sit amet velit luctus scelerisque non ut turpis. Nunc vehicula mauris nulla, eget vulputate diam ultricies at. Integer lobortis volutpat leo, nec vestibulum felis rutrum in. Duis nec efficitur ligula. Maecenas volutpat eu lacus aliquam cursus. Nulla dignissim gravida metus quis consequat. Phasellus tempor suscipit neque vitae interdum.
+ 
+ Vivamus et lectus ac nulla sodales varius. Sed posuere gravida mi, egestas porttitor libero convallis eget. In convallis blandit enim nec eleifend. Fusce faucibus orci vitae tempor vestibulum. Aliquam fermentum ultrices justo eget posuere. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Sed auctor aliquam dictum. Duis tellus ex, ullamcorper elementum augue id, ornare pharetra nibh. Mauris eu rhoncus lectus. Etiam auctor faucibus congue. Aliquam fermentum quam vel eros iaculis gravida.
+ 
+ Fusce vitae egestas ligula. Aenean id convallis turpis, quis faucibus velit. Donec mollis interdum feugiat. Sed venenatis fringilla eros, quis elementum nisi efficitur porta. Vivamus eget posuere lorem. Suspendisse mollis ac urna sed gravida. Nullam viverra mi at metus fringilla mattis. Fusce nisl ex, tincidunt non urna ut, pharetra viverra enim. Duis pulvinar massa id est molestie, sed sagittis tortor egestas. Morbi sagittis vel quam et molestie. Maecenas eleifend ligula in euismod vulputate. Mauris eget tristique ex.
+ 
+ Proin a pretium dolor, blandit tincidunt dolor. Morbi ut velit libero. Vivamus vel posuere urna, et dignissim dolor. Suspendisse placerat justo non diam aliquet, a scelerisque odio faucibus. Cras vitae imperdiet lorem. Donec egestas in tortor ac feugiat. Sed molestie viverra interdum. Donec pulvinar augue eu bibendum tempus. In ut sapien a risus rhoncus volutpat quis viverra leo. Vestibulum arcu eros, mattis non tellus ornare, rutrum scelerisque tellus.
+ 
+ Proin euismod quam est. Maecenas nunc diam, feugiat quis fermentum at, vehicula sit amet tellus. Nulla condimentum imperdiet porta. Pellentesque dolor magna, egestas sed diam eget, porta convallis nibh. Sed vitae libero lacus. Maecenas tempor tortor quis lectus tincidunt vehicula. Pellentesque lectus est, hendrerit a rutrum vulputate, rutrum ut ipsum. Curabitur et tortor vitae tellus dignissim consequat. Quisque feugiat, leo in consequat placerat, eros felis ultrices orci, ut egestas dui quam volutpat ante. Donec tincidunt, tellus facilisis suscipit eleifend, nulla diam sollicitudin massa, vitae aliquet elit justo eu arcu. Pellentesque gravida aliquam augue, ac fringilla nisi pulvinar nec. Aliquam erat volutpat.
+ 
+ Nam consequat varius imperdiet. Vestibulum luctus sapien nec nibh venenatis gravida. Mauris gravida aliquet nisi id pretium. Duis accumsan ultricies blandit. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Quisque interdum, risus ac finibus tincidunt, dui tellus fringilla nisi, malesuada pharetra urna neque quis nisi. Nulla a libero ex. Mauris pretium, felis vitae viverra egestas, lacus nisl porta mi, accumsan viverra tellus nunc id odio.
+ 
+ Etiam posuere nunc urna, et tincidunt justo accumsan sed. Nulla rhoncus eros non felis placerat, eu gravida odio auctor. Mauris malesuada non felis vitae elementum. Etiam luctus mi ut feugiat scelerisque. Quisque molestie ultricies nisi, fringilla vestibulum purus. Aliquam vitae maximus elit, ac semper augue. Cras rhoncus a metus porttitor eleifend. Sed quis enim lectus. Praesent tempor, mi pulvinar commodo pharetra, dui velit suscipit mauris, sit amet mollis quam nisl non nisl. Nunc sit amet lorem lobortis ipsum molestie elementum non nec augue. Fusce lacus justo, aliquet accumsan neque id, vulputate tempor tellus. Ut eu massa auctor, blandit libero ut, tincidunt velit. Aliquam aliquam varius odio condimentum scelerisque. Proin consequat erat nec ligula porttitor, sed suscipit neque feugiat.
+ 
+ Nam consequat at leo non interdum. Nullam at mattis libero. Donec ante nulla, vestibulum eget quam et, luctus finibus nibh. In in ornare felis, eget suscipit turpis. Morbi dignissim mi id turpis convallis, id porttitor tellus tempus. Donec sed rhoncus lacus, ut eleifend ipsum. In sit amet augue est. Cras aliquam felis vitae dolor cursus vehicula. Duis sit amet orci eros. Fusce massa tortor, rutrum eget risus at, vulputate fringilla ligula. Nunc ultricies, mauris at eleifend elementum, tortor justo pulvinar nulla, nec consequat diam odio in dui. Proin porta suscipit augue sed ornare. Interdum et malesuada fames ac ante ipsum primis in faucibus.
+ 
+ Cras vel metus dolor. Morbi cursus semper risus, ac tincidunt diam lobortis et. Sed quis mi lorem. Sed iaculis lorem diam, eget sodales sem posuere non. In convallis dolor in nulla volutpat consectetur. Maecenas finibus egestas nunc, eget placerat sem facilisis eget. Aenean quis eleifend purus. Duis bibendum faucibus arcu, ut lacinia felis suscipit nec. Quisque tincidunt condimentum ex, id ultricies libero malesuada a. Maecenas non fermentum velit, a mattis tellus. Sed tristique libero quis odio finibus accumsan. Nullam a maximus mi. Integer gravida augue erat, vel euismod ante cursus sit amet.
+ 
+ Nullam et consectetur lectus. Morbi lectus purus, elementum et elementum sit amet, pellentesque quis dolor. Quisque sodales mi vitae imperdiet condimentum. Curabitur ultrices augue eu metus condimentum imperdiet. Donec placerat dignissim finibus. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Nam in velit malesuada, aliquet elit sed, blandit nulla. Cras id vehicula diam, eu molestie sem. Aenean porta magna a metus rutrum, a varius felis posuere. Mauris nibh tortor, lacinia eget odio eget, ultrices consequat odio. Donec sed orci risus. Ut auctor porttitor dictum. Phasellus dictum neque ullamcorper urna tempor, et feugiat velit porta. Vestibulum tincidunt, sem bibendum consequat tristique, erat quam varius ante, a egestas lectus augue non tortor. Curabitur eget placerat enim.
+ 
+ Maecenas augue quam, commodo vitae convallis eu, commodo non odio. Quisque id magna quis mauris sodales accumsan id at velit. Praesent varius nibh at feugiat dictum. Etiam sodales libero maximus purus ultricies, id vehicula mi finibus. Aliquam ut ligula nunc. Aenean nec sodales est, et ornare velit. Sed in ex maximus, finibus diam quis, lobortis massa. Nulla in odio maximus, finibus eros dapibus, accumsan ex. Phasellus nec ullamcorper magna. Integer eros dolor, aliquam porta mauris ac, gravida efficitur lacus. Quisque ac ornare nulla, eu consequat massa.
+ 
+ Sed ut lectus dignissim, sodales odio nec, egestas erat. Vestibulum at eleifend tellus, vel pulvinar sem. Phasellus elementum in arcu vel fermentum. Maecenas non sem eros. Ut rutrum tortor ut nisi placerat, sed tempor nibh pharetra. Morbi sit amet tincidunt est. Duis at blandit elit. Suspendisse consequat est a lectus sodales porta. In hac habitasse platea dictumst. Morbi consequat mi semper gravida porta. Phasellus pulvinar suscipit lacus.
+ 
+ Duis varius condimentum pretium. Curabitur eget venenatis nunc, tempor volutpat velit. Quisque gravida ultricies dui, non posuere ipsum sollicitudin eu. Vivamus tincidunt, risus eu tristique interdum, tortor nunc vulputate justo, a condimentum ipsum libero sit amet enim. Vivamus a interdum massa. Nam vulputate pharetra congue. Vestibulum gravida quam eros, ac euismod erat faucibus ac.
+ 
+ Nunc mattis quis massa at ullamcorper. Suspendisse consequat ligula id dolor faucibus, id tincidunt risus hendrerit. Vivamus vestibulum est sed enim sodales, eu malesuada orci dictum. Sed aliquam ut ligula ut tristique. Interdum et malesuada fames ac ante ipsum primis in faucibus. Sed convallis at ex in accumsan. Ut ac nisl ut velit mattis egestas eget nec massa. Fusce non nulla felis. Nunc commodo vestibulum urna non finibus. Fusce id fringilla lacus. Nunc quis accumsan mauris. Nullam eu placerat nisi, quis pretium metus. Pellentesque blandit lacus at libero interdum efficitur. Quisque consectetur eros quis enim convallis, ac gravida massa semper. Phasellus tincidunt mattis nisl.
+ 
+ Nullam consequat, nunc eget hendrerit hendrerit, metus metus consequat odio, at lacinia erat magna ut metus. In hac habitasse platea dictumst. Pellentesque accumsan augue arcu, sed posuere velit hendrerit at. Maecenas consectetur sed lacus in faucibus. Vestibulum elementum mollis neque, sed ullamcorper turpis vehicula tincidunt. Vivamus dignissim vulputate dapibus. Sed facilisis blandit leo non scelerisque. Mauris suscipit auctor felis at placerat. Donec nec odio eget elit dictum elementum vel hendrerit ex. Sed at ex mollis, maximus libero aliquet, fermentum dui. Integer mauris augue, blandit ut tristique mollis, tincidunt vitae nulla. Fusce malesuada justo vitae tortor posuere, ut laoreet nisl blandit.
+ 
+ Nunc scelerisque sit amet metus quis hendrerit. Vivamus laoreet neque ut efficitur hendrerit. Suspendisse potenti. Nullam rutrum nulla diam, non cursus elit tincidunt ut. In ut faucibus lacus. Duis faucibus massa id augue vehicula, in tristique ligula blandit. Nullam cursus magna lectus, et condimentum ipsum finibus at. Quisque dictum sapien et lectus pretium, sit amet semper neque rhoncus. Mauris tristique lorem gravida pulvinar lobortis. Aliquam consectetur posuere est non condimentum. Proin non diam at purus scelerisque cursus. In hac habitasse platea dictumst. Sed sagittis nulla turpis, sed consectetur leo mattis vel.
+ 
+ Sed tristique lobortis ante sit amet bibendum. Suspendisse tempus tortor et nibh interdum, in sagittis justo varius. Phasellus bibendum bibendum hendrerit. Sed pretium velit eget molestie tincidunt. Ut feugiat tortor non odio euismod ultrices. Morbi non ante vitae purus luctus rutrum. Aenean quis velit sem. Phasellus eleifend, dolor nec rutrum bibendum, nulla nibh ultrices sapien, sit amet blandit velit lacus sit amet sapien. Nullam dignissim, eros quis suscipit facilisis, justo nisi scelerisque neque, sed tincidunt nisi felis id libero. Ut tincidunt maximus iaculis. In malesuada lectus sed vestibulum fringilla. Nulla feugiat feugiat consectetur. Duis commodo diam non quam efficitur euismod. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Aenean non purus ut lectus sagittis tincidunt non venenatis lectus. Nulla efficitur lacus at eros aliquam dignissim.
+ 

A  => demo/short.txt +3 -0
@@ 1,3 @@
+ Lorem ipsum dolor sit amet, consectetur adipiscing elit. Phasellus a pretium urna. Aliquam erat volutpat. Ut varius quam vel metus laoreet lacinia. Suspendisse ut nibh nisi. Aliquam interdum nulla sed nibh facilisis auctor. Pellentesque rutrum aliquet elit et faucibus. Proin sed nisl at quam porttitor ultrices ac tincidunt sapien. Mauris rhoncus id ipsum vulputate ullamcorper. Pellentesque suscipit, ligula non dictum fringilla, enim felis luctus quam, ut consectetur nisi lorem eu arcu. Proin tellus libero, gravida ut imperdiet vitae, pulvinar vitae arcu. Nunc congue augue at risus condimentum, id ornare orci ultricies. Nullam imperdiet felis id sodales faucibus.
+ 
+ Sed mollis tempus tortor. Etiam auctor lectus et facilisis malesuada. Mauris vitae ex consequat, viverra nisi in, rutrum felis. Nunc id nisl rhoncus, egestas turpis vitae, gravida magna. Donec vehicula sollicitudin massa, ut tincidunt lorem. Quisque malesuada turpis non efficitur feugiat. Fusce volutpat pharetra eros, a egestas quam elementum et. Praesent at odio diam. Nullam egestas, dolor quis porta cursus, nulla nulla maximus lectus, ac rhoncus purus purus et lectus. Maecenas hendrerit tellus sed tortor faucibus, a pellentesque lectus varius. Mauris tristique sem accumsan felis consectetur facilisis. Curabitur eget orci ex. Sed auctor condimentum leo quis sodales. Praesent ultrices libero eros, at vehicula massa aliquet eget. Fusce semper ullamcorper nulla at facilisis.

A  => pager.nimble +16 -0
@@ 1,16 @@
+ # Package
+ 
+ version       = "0.1.0"
+ author        = "Michael Rees"
+ description   = "A simple library for paging, similar to less"
+ license       = "GPL-3.0"
+ srcDir        = "src"
+ installExt    = @["nim"]
+ bin           = @["pager"]
+ binDir        = "bin"
+ 
+ 
+ 
+ # Dependencies
+ 
+ requires "nim >= 0.20.0"

A  => src/pager.nim +19 -0
@@ 1,19 @@
+ import parseopt
+ 
+ import pagerpkg/pager
+ 
+ 
+ proc page*(contents: string) =
+   pager.page(contents)
+ 
+ 
+ when isMainModule:
+   var p = initOptParser()
+   while true:
+     p.next()
+     case p.kind
+     of cmdEnd: break
+     of cmdShortOption, cmdLongOption:
+       raise newException(ValueError, "unrecognized option given")
+     of cmdArgument:
+       page(readFile(p.key))

A  => src/pagerpkg/pager.nim +72 -0
@@ 1,72 @@
+ import std/wordwrap
+ import strutils
+ import terminal
+ 
+ 
+ proc displayLines(allLines: seq[string], ix: int) =
+   eraseScreen(stdout)
+ 
+   let height = terminalHeight()
+ 
+   # max with 0 to avoid negative index if content is longer than screen height
+   let startIx = max(0, min(ix, allLines.len - height))
+   let stopIx = min(startIx + terminalHeight(), allLines.len) - 1
+ 
+   # If the content is shorter than the screen is tall, push it to the bottom
+   var cursorY = 0
+   if allLines.len < height:
+     cursorY = height - allLines.len
+   setCursorPos(0, cursorY)
+ 
+   let linesToShow = allLines[startIx..stopIx]
+   for line in linesToShow:
+     stdout.write line
+     cursorDown(stdout, 1)
+     cursorBackward(stdout, line.len)
+ 
+ 
+ proc page*(contents: string) =
+   ## Clear the screen and write chunks of `s` as they fit onto stdout
+ 
+   # wrapWords doesn't handle newlines that are already in the text well,
+   # so we split the contents into chunks, wrap the chunks, and then join them
+   var wrappedLines: seq[string] = @[]
+   let width = terminalWidth()
+   for line in contents.splitLines():
+     if line.len > 0:
+       wrappedLines.add(splitLines(wrapWords(line, maxLineWidth = width)))
+     else:
+       wrappedLines.add(line)
+ 
+   # Get rid of any empty lines on the end of the string
+   while wrappedLines[wrappedLines.len-1].len == 0:
+     discard pop(wrappedLines)
+ 
+   hideCursor(stdout)
+   # lineIx is the index of the *top* line that should be shown
+   var lineIx = 0
+ 
+   # Show the appropriate chunk of lines until told to stop
+   while true:
+     let height = terminalHeight() # in case the terminal has been resized
+     let stepSize = int(height / 2)
+     displayLines(wrappedLines, lineIx)
+     case getch():
+     of 'j': # scroll down
+       lineIx = min(lineIx + 1, wrappedLines.len - height)
+     of 'k': # scroll up
+       if lineIx >= 1: # but only if not already at the top
+         lineIx -= 1
+     of 'G': # go to the last line
+       lineIx = max(0, wrappedLines.len - height)
+     of 'g': # go back to the start
+       lineIx = 0
+     of chr(21): # Ctrl-U: go up one half-screen's worth
+       lineIx = max(0, lineIx - stepSize)
+     of chr(4): # Ctrl-D: go down one half-screen's worth
+       lineIx = min(lineIx + stepSize, wrappedLines.len - height)
+     of '\3', 'q': # keyboard interrupt or quit
+       stdout.write "\n"
+       showCursor(stdout)
+       return
+     else: continue