.gitignore: Ignore etags

Signed-off-by: Xinglu Chen <public@yoctocell.xyz>

test: Add test for org file

Signed-off-by: Xinglu Chen <public@yoctocell.xyz>

Cli: Remove unused parts

Use "-" as separator

* Parser.hs (parseHint): Use `manyTill` and consume preceding
whitespace.
* test.txt: Update accordingly.

Ui.hs: Add docs

test: Update test file

Use Data.Text and attoparsec

Cli.hs: Add function to handle error

default.nix: Add shell hook

Change license to GPLv3

Use Parsec instead of regex

Cli.hs: Disable stdin

default.nix: Rewrite

envrc: Use flake

Cli.hs: Add FIXME for stdin

Reading stdin in currently broken.

flake.nix: Add system

Cli.hs: Parse file on -f

gitignore: Ingore ./result-doc

Add cli args

Update release