NerdyPepper / Eva
Licence: mit
a calculator REPL, similar to bc(1)
Stars: ✭ 405
Programming Languages
rust
11053 projects
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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 0.2.4
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.
> 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.
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
screenshotscreate logounary operators (minus, plus)add detailed error handleradd unit tests-
lineditorwith 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:
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