Crust

Crust is a experimental crossplatform exotic shell.
This readme contains notes to myself.

Progress

Language features

Syntax	Parsing	Eval
Literals	✅	✅
Binary operators	✅	✅
Unary operators	✅	✅
Function/Command calls	✅	✅
Blocks	✅	✅
Function Declarations	✅	✅
If	✅	✅
loop	✅	✅
while	✅	✅
for	✅	✅
Break	✅	✅
Continue	✅	✅
Return	✅	✅
Assignment	✅	✅
Variable declaration	✅	✅
Export	✅	✅
Alias	✅	✅
Lists	✅	✅
Indexing	✅	✅
Slicing	❌	❌
Maps	✅	✅
Tables	✅	✅
Pipes	✅	✅
Glob	✅	✅
Questionmark / single char glob	✅	✅
Bracket globing char	✅	✅
Subexpressions	✅	✅
Assign and modify += *= etc	✅	✅
Run command as background job	❌	❌
Escapes sequences	✅	✅
Closures	✅	✅

Standard functions

Name	Completed	About
clear	✅	Clear screen
cd	✅	Change working directory
exit	✅	Exit shell
echo	✅	Echo value back
pwd	✅	Print working directory
import	✅ (Not locking / integrity)	Import code from file or URL
open	✅	Open url with default program
read/input	✅	Read user input from stdin
load	✅	Read data from file
save	✅	Save data to file

(More functions to come)

Other features

Feature	Completed
Custom prompt	✅
Starship integration	✅

Starship integration

import https://raw.githubusercontent.com/Kl4rry/crust/main/libs/starship.crust

Todo

Columns and indexing when passing arguments.
Add builtins and functions to help when calling unknown command.
Rework defing functions to use cli parser.
Add sub commands to cli parser.
Convert statements into expressions.
Better error for unclosed delimiters.

Low prio todo

Make command pipelines lazy.
Create a better line writer than rustyline.
Fish-like selector for completer.

Bugs

A bunch of places convert values to string where it should throw an hard error instead.

Questions to be answered

Should return take a expr as optional parameter? What does even return mean as functions dont have traditional return values?