A terminal calculator inspired by Numi and Soulver. Write math expressions in a multi-line editor and see results instantly.
go install github.com/gfonseca/numer@latestOr build from source:
git clone https://github.com/gfonseca/numer
cd numer
go build -o numer .numer # start a blank session
numer file.nm # open an existing sheetnumer works like a simple text editor (nano-style). Each line is evaluated as you type and the result appears on the right column.
| Key | Action |
|---|---|
| Arrow keys | Move cursor |
| Home / End | Start / end of line |
| PgUp/PgDn | Scroll by page |
| Enter | New line |
| Backspace | Delete character left |
| Delete | Delete character right |
| Ctrl+K | Kill (delete) to end of line |
| Ctrl+A | Move to start of line |
| Ctrl+E | Move to end of line |
| Ctrl+Z | Undo |
| Ctrl+Y | Redo |
| Ctrl+S | Save |
| Ctrl+Q | Quit |
Lines scroll horizontally when they exceed the editor width.
Sheets are plain text files (.nm by convention). Each line is one expression. You can open them in any text editor.
When saving an untitled session (Ctrl+S), numer prompts for a file path at the bottom of the screen.
| Operator | Meaning | Example |
|---|---|---|
+ |
Addition | 10 + 5 |
- |
Subtraction | 10 - 5 |
* |
Multiplication | 3 * 4 |
/ |
Division | 10 / 4 → 2.5 |
% |
Modulo | 10 % 3 → 1 |
^ |
Power | 2 ^ 10 → 1024 |
( ) |
Grouping | (1 + 2) * 3 |
Power is right-associative: 2 ^ 3 ^ 2 = 2 ^ (3 ^ 2) = 512.
Assign with =. Variable names are case-insensitive.
price = 100
discount = 0.2
price - price * discount
The special variable last always holds the result of the previous evaluated line:
100 * 1.1
last * 1.1
last * 1.1
| Name | Value |
|---|---|
pi |
3.14159265358979... |
e |
2.71828182845904... |
tau |
6.28318530717958... (2π) |
phi |
1.61803398874989... (golden ratio) |
| Function | Description | Args |
|---|---|---|
sqrt(x) |
Square root | 1 |
abs(x) |
Absolute value | 1 |
floor(x) |
Round down | 1 |
ceil(x) |
Round up | 1 |
round(x) |
Round to nearest integer | 1 |
sin(x) |
Sine (radians) | 1 |
cos(x) |
Cosine (radians) | 1 |
tan(x) |
Tangent (radians) | 1 |
asin(x) |
Arc sine | 1 |
acos(x) |
Arc cosine | 1 |
atan(x) |
Arc tangent | 1 |
atan2(y, x) |
Arc tangent of y/x | 2 |
log(x) / ln(x) |
Natural logarithm | 1 |
log2(x) |
Base-2 logarithm | 1 |
log10(x) |
Base-10 logarithm | 1 |
exp(x) |
e raised to the power x | 1 |
pow(x, y) |
x raised to the power y | 2 |
max(a, b, ...) |
Maximum of arguments | 1+ |
min(a, b, ...) |
Minimum of arguments | 1+ |
sum(a, b, ...) |
Sum of all arguments | 0+ |
Lines starting with # or // are treated as comments and produce no result.
# monthly budget
salary = 5000
// expenses
rent = 1200
salary - rent
Type sum-total on any line to draw a separator and display the running total of all numeric results above it. The accumulator resets after each sum-total, so you can use it multiple times in the same sheet without double-counting.
# January
rent = 1200
groceries = 300
utilities = 150
sum-total → 1650
# February
rent = 1200
groceries = 280
utilities = 140
sum-total → 1620
The sum-total keyword is case-insensitive. Its result is also stored in last.