edn -> dsl

dsl/README.md

@@ -0,0 +1,94 @@
+# `ket`
+
+**ket** is the configuration language of **tek**.
+it's based on [edn](https://en.wikipedia.org/wiki/Clojure#Extensible_Data_Notation)
+but without all the features.
+
+## usage
+
+### with `tengri_output`
+
+this is a `tengri_output` view layout defined using ket:
+
+```edn
+(bsp/s (fixed/y 2 :toolbar)
+  (fill/x (align/c (bsp/w :pool
+    (bsp/s :outputs (bsp/s :inputs (bsp/s :tracks :scenes)))))))
+```
+
+### with `tengri_input`
+
+this is a `tengri_input` keymap defined using ket:
+
+```edn
+(@u       undo 1)
+(@shift-u redo 1)
+(@e       editor show :pool-clip)
+(@ctrl-a  scene add)
+(@ctrl-t  track add)
+(@tab     pool toggle)
+```
+
+## tokens
+
+ket has 4 "types", represented by variants of the `Value` enum:
+
+* `Num` - numeric literal
+* `Sym` - textual symbol
+* `Key` - textual key
+* `Exp` - parenthesized group of tokens
+
+### numeric literal
+
+numbers are passed through as is. only non-negative integers are supported.
+
+```edn
+0
+123456
+```
+
+### keys
+
+keys are the names of available operations. they look like this:
+
+```edn
+simple-key
+multi-part/key
+```
+
+keys are implemented by the underlying subsystem:
+
+* in `tengri_output`, keys are names of layout primitives
+* in `tengri_input`, keys are names of commands
+
+### symbols
+
+symbols that start with `:` represent the names of variables
+provided by the `Context` trait - such as command parameters,
+or entire layout components:
+
+```edn
+:symbol-name
+```
+
+symbols that start with `@` represent keybindings.
+they are parsed in `tengri_tui` and look like this:
+
+```edn
+@ctrl-alt-shift-space
+```
+
+### parenthesized groups
+
+parenthesized groups represent things like expressions
+or configuration statements, and look like this:
+
+```edn
+(some-key :symbol (some/other-key @another-symbol 123) 456)
+```
+
+## goals
+
+* [ ] const parse
+* [ ] live reload
+* [ ] serialize modified code back to original indentation