Add rough preview

README.md

@@ -1,23 +1,75 @@
 # Lytlang
 
-**TODO: Add description**
+Lytlang's goal is to allow for more terse Elixir code and is itself written in
+Elixir. Its syntax is a terrible merging of Elm, CoffeeScript, Elixir, and some
+made-up crap. Here's a rough preview:
+
+```
+!mod Leetcode
+
+# Look, a comment!
+
+### part of the comment
+Look, a multiline comment!
+part of the comment ###
+
+@doc
+	LeetCode #1: two_sum
+
+	TODO: store a map of complements (differences) as iterating for O(n)
+
+fn two_sum _:list _:int i=0 ::
+	[] _ _ -> nil
+	[cur | rest] target current_index
+		Enum.find_index rest, fn x -> cur + x == target ::
+			nil -> two_sum rest target current_index
+			i -> [current_index, 1 + current_index + i]
+
+@doc LeetCode #2: add_two_numbers
+
+fn add_two_numbers _:list _:list _=[] i=0 ::
+	[] _ l m, _ [] l m -> finish_add_two_numbers l m
+  [n1 | r1] [n2 | r2] l carry
+		add_two_numbers r1 r2 [rem (carry + n1 + n2) 10) | l] (div n1 + n2 10)
+
+fn finish_add_two_numbers l:list m:int -> m == 0 ? l : [m | l]
+
+@doc
+	LeetCode #3: longest non-repeating susbtring
+
+	TODO: better utility function names?
+
+fn longest_non_repeating_substring s
+	s |> String.codepoints |> Enum.reduce {0 0 0 %{}} &ln3_reducer/2 |> elem 0
+
+fn ln3_new_least least map char
+	Map.has_key? map char ::
+		true -> max least ((Map.get map char) + 1)
+		_ -> least
+
+fn ln3_reducer char {mx i least map}
+	least = ln3_new_least least map char
+	{(max mx (i - least + 1) (i + 1) least (Map.put map char i)}
+
+@doc
+	LeetCode #4: median of sorted arrays
+
+	TODO: solution should me O(log(m+n))
+	TODO: finish an actual solution?
+
+fn median_of_sorted_arrays _ _ -> 3
+
+@doc LeetCode #65: Valid Number
+
+@valid_decimal_number_regex ~r/^\s*(?:\+|-)?\d+(?:\.(?=\d))?\d*(?:e(?=[\d\+-]))?(?:\+|-)?\d*(?:\.(?=\d))?\s*$/
+
+fn valid_decimal_number s -> Regex.match? @valid_decimal_number_regex s
+```
+
+**TODO: Add more description**
+
+## Development Resources
 
 + https://pl-rants.net/posts/leex-yecc-in-elixir/
 + https://notes.eellson.com/2017/01/22/html-parsing-in-elixir-with-leex-and-yecc/
 
-## Installation
-
-If [available in Hex](https://hex.pm/docs/publish), the package can be installed
-by adding `lytlang` to your list of dependencies in `mix.exs`:
-
-```elixir
-def deps do
-  [
-    {:lytlang, "~> 0.1.0"}
-  ]
-end
-```
-
-Documentation can be generated with [ExDoc](https://github.com/elixir-lang/ex_doc)
-and published on [HexDocs](https://hexdocs.pm). Once published, the docs can
-be found at [https://hexdocs.pm/lytlang](https://hexdocs.pm/lytlang).