# Irsh

## Description
  Bash like interpreter and maybe compiler?
  Designed to be used as an interactive shell with minimal dependencies, will not support all bash syntax.


## Features
- support a unique bash syntax for variable/function declaration
- always assume a { after a $ and that the brackets/parenthesis are correctly closed
- ignore corner cases due to unclosed blocks/quote and crash for an easier (and faster?) implem
- functions/program arguments with no default value are considered mandatory
- one level of sub-command only
- sub-commands can only be used at the beginning of double quoted string
- sub-commands are limited to variables/words and redirection symbols
- no support for nested quotes
- no support (yet?) for multi-lines strings
- value must be quoted when declaring a variable

## Limitations
- can fail on some edge cases
- only &> redirection will be implemented
- support only ${alphanum}, no $@ or $* or any other form
- infinite loop if non closed sub-command
- infinite loop if $() without the ""

## Objectives
- parse bash variables with scoping and defaults
- parse bash functions via `function` keyword
- support invocation of external commands
- implement a subset of basic bash functionalities
- support stdout/err redirections