Sweet Calc

This is a handy CLI calculator for doing quick calculations with custom operators and some syntax sugar.

Usage

# From stdin
$ echo '1+1;2+2' | c
= 2
= 4

# With argument
$ c 1+1
= 2

# Or interactively as REPL
$ c
> 1+1
= 2

> bar=24;45+bar
= bar = 24
= 69

# Up/Down Arrows to navigate history
> bar=24;45+bar

# Delete input with Ctrl+D
> |

# Quit with Ctrl-C
$ |

⚠️ REPL mode is only available for Unix at the moment.

Operators

• + Addition
• - Subtraction
• * Multiplication
• % Modulo
• / Division
• // Floor Division
• ** Power
• v Root (eg: sqrt(9) = 2v9)

Functions

• sin Sine
• cos Cosine
• tan Tangent
• asin Arc sine
• acos Arc cosine
• atan Arc tangent

Variables

Variable names must start with a letter and can only contain alphanumeric characters and _

> foo = 2+2
= foo = 4

> foo = foo+foo
= foo = 8

> sin 2+foo
= -0.544021

> foo*foo
= 64

> snake_case_69 = foo
= snake_case_69 = 8

Numbers

Floats can start with . and the integer part can be spaced with _

> .2
= 0.2

> 0.100001
= 0.100001

# Display precision of 6 decimal places
> 0.1000001
= 0.1

> 2v2
= 1.414214

> 69_420
= 69_420

> 33___33
= 3333

> 1000000.21
= 1_000_000.21

Syntax sugar

# Space significant
> 1+1 *2
# (1+1)*2
= 4

> 1+1* 2* 4
# 1+1*(2*(4))
= 9

# Multiplication when next to bracket
> 2(1+1)
= 4

> (1+1)(1+1)
= 4

# Optional closing brackets
> 8/(1+1
= 4

Errors

# Nice errors
$ c '1+1 1+1'

    1+1 1+1
      ^^^
error at position 2:
    preprocessor: token: 3: two consecutive operands without operator
    
$ c '1+1* bar+1'

    1+1*(bar+1)
         ^^^
error at position 5:
    eval tree: undefined variable: "bar"

$ c '2*2+asin 2'

    2*2+asin(2)
        ^^^^
error at position 4:
    eval tree: asin(2) = NaN

Installation

$ git clone git@github.com:MarcosTypeAP/sweet-calc.git --depth=1
$ cd sweetcalc

# Must have Go installed
$ PREFIX=~/.local/bin make install

$ c '1+1'
= 2