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-# Cataract - an environment for end-user programming in Lua 5.1
+# Teliva - an environment for end-user programming
 
-"Enable all people to modify the software they use in the course of using it."
--- https://futureofcoding.org/episodes/033.html
+> “Enable all people to modify the software they use in the course of using it.”
+> — https://futureofcoding.org/episodes/033.html
 
-"What if we, and all computer users, could reach in and modify our favorite apps?"
--- https://www.inkandswitch.com/end-user-programming
+> “What if we, and all computer users, could reach in and modify our favorite apps?”
+> — https://www.inkandswitch.com/end-user-programming
 
-"Software must be as easy to change as it is to use it"
--- https://malleable.systems
+> “Software must be as easy to change as it is to use.”
+> — https://malleable.systems
+
+## What's this, then?
+
+An extremely naïve, [brutalist](https://en.wikipedia.org/wiki/Brutalist_architecture)
+attempt at packaging up simple Lua (5.1) apps with all the stuff needed to
+edit and build them.
+
+```
+git clone https://github.com/akkartik/teliva
+cd teliva
+make linux
+src/teliva hanoi.teliva
+```
+
+Here's an example app (the [Tower of Hanoi](https://en.wikipedia.org/wiki/Tower_of_Hanoi)):
+
+<img alt='screenshot of Teliva running the Towers of Hanoi' src='doc/hanoi.png'>
+
+The idea is that no matter what app you run, you are always guaranteed access
+to a hotkey (currently `ctrl-e`) to edit its sources.
+
+<img alt='screenshot of Teliva editing the Towers of Hanoi' src='doc/hanoi-edit.png'>
+
+Save (`ctrl-s`) and quit (`ctrl-x`) to restart the app with the new sources.
+
+Over time I hope to improve the experience for error messages, failing tests,
+undoing changes and so on. The emphasis will be on maximizing hackability
+rather than functionality. I plan to be extremely parsimonious in taking on
+further dependencies. It should need just a Linux (or maybe some other Unix?)
+kernel, a C compiler, 12kLoC of Lua in this repo, ncurses.
+
+## Why Lua?
+
+It's reputedly the fastest interpreted language per line of implementation
+code.
+
+## Will it run any Lua program?
+
+Not quite. This approach doesn't make sense for batch programs, I think. I
+also don't know how to obtain a simple, shallow Graphics stack, so there's no
+support for graphics at the moment. Teliva initializes the ncurses library by
+default, so apps should assume they have access to a text-mode window for
+printing text to, and a keyboard for reading unbuffered keystrokes from.
+Compare `hanoi.teliva` with `hanoi.lua` to get a sense for what changes are
+needed. My plan is to disable support for certain Lua libraries as I gain
+experience programming in this way.
+
+I want to provide sandboxed access to system resources (file system, network,
+etc.) which will likely create incompatibilities with the standard library.
+I'm disinclined to try to &lsquo;improve&rsquo; on Lua syntax, however. It's
+not my favorite, but it's good enough.
+
+It's also not tested much yet. This is my first time programming either in Lua
+or within Lua. Bug reports most appreciated.
+
+## What's with the name?
+
+Teliva is the Tamil root for &lsquo;clear&rsquo;. Very much aspirational.
+
+## Credits
+
+This repository is an unholy union of:
+* The [Lua](https://www.lua.org) 5.1 programming language.
+  ([Documentation](https://www.lua.org/pil/contents.html))
+* The [Ncurses](https://tldp.org/HOWTO/NCURSES-Programming-HOWTO) library for
+  building text-mode user interfaces. ([Alternative documentation](https://tldp.org/LDP/lpg-0.4.pdf))
+* The [Lcurses](https://github.com/lcurses/lcurses) library providing Lua
+  bindings for Ncurses. ([Documentation](http://lcurses.github.io/lcurses))
+* The [Kilo](https://github.com/antirez/kilo) text editor. ([With a fantastic
+  walk-through.](https://viewsourcecode.org/snaptoken/kilo))
+
+Send all praise to them, brickbats to [me](http://akkartik.name/contact).
 
 # README for Lua 5.1
 
@@ -41,3 +113,29 @@
   Science of PUC-Rio (the Pontifical Catholic University of Rio de Janeiro
   in Brazil).
   For more information about the authors, see http://www.lua.org/authors.html .
+
+# README for Kilo
+
+Kilo is a small text editor in less than 1K lines of code (counted with cloc).
+
+A screencast is available here: https://asciinema.org/a/90r2i9bq8po03nazhqtsifksb
+
+Usage: kilo `<filename>`
+
+Keys:
+
+    CTRL-S: Save
+    CTRL-Q: Quit
+    CTRL-F: Find string in file (ESC to exit search, arrows to navigate)
+
+Kilo does not depend on any library (not even curses). It uses fairly standard
+VT100 (and similar terminals) escape sequences. The project is in alpha
+stage and was written in just a few hours taking code from my other two
+projects, load81 and linenoise.
+
+People are encouraged to use it as a starting point to write other editors
+or command line interfaces that are more advanced than the usual REPL
+style CLI.
+
+Kilo was written by Salvatore Sanfilippo aka antirez and is released
+under the BSD 2 clause license.