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# eva
simple calculator REPL, similar to `bc(1)`, with syntax highlighting and persistent history
### installation
- Homebrew
```shell
$ brew install eva
```
- crates.io
```shell
$ cargo install eva
```
- manual
```shell
$ git clone https://github.com/nerdypepper/eva.git
$ cargo run
```
### usage
```shell
eva 0.2.4
NerdyPepper <[email protected]>
Calculator REPL similar to bc(1)
USAGE:
eva [FLAGS] [OPTIONS] [INPUT]
FLAGS:
-h, --help Prints help information
-r, --radian set eva to radian mode
-V, --version Prints version information
OPTIONS:
-b, --base <RADIX> set the radix of calculation output (2, 8, 10, 16 etc.)
-f, --fix <FIX> set number of decimal places in the output
ARGS:
<INPUT> optional expression string to run eva in command mode
```
type out an expression and hit enter, repeat.
```shell
> 1 + sin(30)
1.5
> floor(sqrt(3^2 + 5^2))
5
> 5sin(45) + cos(0)
4.53553
```
### updating
- crates.io
```shell
$ cargo install eva --force
```
- manual
```shell
$ 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.
```
sin cos tan csc sec cot sinh cosh tanh
asin acos atan acsc asec acot ln log sqrt
ceil floor abs
deg(x) - convert x to degrees
rad(x) - convert x to radians
```
examples:
```
sqrt(sin(30)) # parentheses are mandatory for functions
log100 # no
log(100) # yes
```
### 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:
[Ivan Tham](https://github.com/pickfire)
[Milan Marković](https://github.com/hepek)
[asapokl](https://github.com/kzoper)
|
