589b737d43ed24d45417d4619b15ef6136bdad90 — Michael Rees 4 months ago
Simple method for paging long strings
8 files changed, 917 insertions(+), 0 deletions(-)

A .gitignore
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 @@

A  => LICENSE +674 -0
@@ 1,674 @@
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+    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
+  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

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
+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