Calc is a somewhat high-performance terminal-based expression interpreter written in C11, utilising Flex and Bison to deliver a powerful, extensible REPL (Read-Eval-Print Loop).
It offers an expressive and programmable interface for evaluating complex expressions, conversions, and utilities with Unix philosophy in mind.
- Arithmetic:
+,-,*,/,%,** - Bitwise:
&,|,^,~,<<,>> - Logical:
&&,||,! - Comparison:
==,!=,<,>,<=,>= - Full operator precedence and associativity support
- Unary operations:
+,-,!,~
- 64-bit signed integers
- Input in multiple bases: binary (
0b), octal (0o), decimal, hexadecimal (0x) - Type inference in outputs:
int64,char,utf8,string
- Conversion:
str(),hex(),bin(),oct(),chr(),ord() - Encoding:
ansi(),utf8(),unicode() - Maths:
abs(),min(),max(),gcd(),lcm(),fact(),mod(),divmod() - Bit utilities:
setbit(),clrbit(),togglebit(),isbit(),rol(),ror() - Type introspection:
type(),len(),dump()
- ANSI-colour formatted results and errors
- Emoji-enhanced output (✔ success, ✖ error, → result)
- Real-time parenthesis matching
- Syntax-highlighted REPL echo
- Custom themes via
:themeorCALC_THEME
:help,:exit,:vars,:functions,:doc,:save,:copy,:clear:precision,:debug,:ast,:tokensfor introspection
- Shell piping and redirection
- Environment variable access:
env("USER") - Clipboard support via
xclip - Terminal-aware formatting (
:cols,:rows)
- Persistent command history (
~/.calc_history) - Named variables:
x = 42 - Last result reference via
_ - Mini macros and function aliases:
def double(x) = x * 2