eva
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a calculator REPL, similar to bc(1)
eva
simple calculator REPL, similar to bc(1)
, with syntax highlighting and persistent history
installation
- Homebrew
$ brew install eva
- crates.io
$ cargo install eva
- manual
$ git clone https://github.com/nerdypepper/eva.git
$ cargo run
usage
eva 0.3.0
NerdyPepper <[email protected]>
Calculator REPL similar to bc(1)
USAGE:
eva [OPTIONS] [INPUT]
ARGS:
<INPUT> Optional expression string to run eva in command mode
OPTIONS:
-b, --base <RADIX> Radix of calculation output (1 - 36) [default: 10]
-f, --fix <FIX> Number of decimal places in output (1 - 64) [default: 10]
-h, --help Print help information
-r, --radian Use radian mode
-V, --version Print version information
type out an expression and hit enter, repeat.
> 1 + sin(30)
1.5
> floor(sqrt(3^2 + 5^2))
5
> 5sin(45) + cos(0)
4.53553
updating
- crates.io
$ cargo install eva --force
- manual
$ cargo install --force --path /path/to/eva
operators
- binary operators:
+ - * / ^ **
- unary operators:
+ -
constants
some constants available in rust standard library.
e pi
examples:
pi * 5^2 # πr²
functions
all trigonometric functions expect input in degrees.
1 argument:
sin cos tan csc sec cot sinh cosh tanh
asin acos atan acsc asec acot ln log10 sqrt
ceil floor abs
2 arguments:
log nroot
deg(x) - convert x to degrees
rad(x) - convert x to radians
examples:
sqrt(sin(30)) # parentheses are mandatory for functions
log10100 # no
log10(100) # yes
log(1, 10) # function with two arguments
quality of life features
- auto insertion of
*
operator
>12sin(45(2)) # 12 * sin(45 * (2))
12
- auto balancing of parentheses
>ceil(sqrt(3^2 + 5^2 # ceil(sqrt(3^2 + 5^2))
6
- use previous answer with
_
> sin(pi)
0.0548036650
> _^2
0.0030034417
>
- super neat error handling
> 1 + ln(-1)
Domain Error: Out of bounds!
- syntax highlighting
todo
- ~~add support for variables (pi, e, _ (previous answer))~~
- ~~syntax highlighting~~
- ~~multiple arg functions~~
- ~~screenshots~~
- ~~create logo~~
- ~~unary operators (minus, plus)~~
- ~~add detailed error handler~~
- ~~add unit tests~~
- ~~lineditor~~ with syntax highlighting
- ~~add more functions~~
contributors
the rust community has helped eva come a long way, but these devs deserve a special mention for their contributions: