grayscale 0.0.1

Enable or disable macOS grayscale display mode
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62

# grayscale

A tiny macOS command-line tool to enable, disable, or toggle system-wide grayscale mode.

## Installation

### From source

```
cargo install --path .
```

### Build manually

```
git clone https://github.com/eugenehp/grayscale.git
cd grayscale
cargo build --release
cp target/release/grayscale /usr/local/bin/
```

## Usage

```
grayscale on        # enable grayscale
grayscale off       # disable grayscale
grayscale toggle    # toggle the current state
grayscale status    # print "on" or "off" to stdout
```

`status` prints to stdout so it can be used in scripts:

```sh
if [ "$(grayscale status)" = "on" ]; then
    echo "display is grayscale"
fi
```

## How it works

The tool calls `UAGrayscaleSetEnabled` and `UAGrayscaleIsEnabled` from Apple's private `UniversalAccess.framework`, loaded at runtime via `dlopen`. No Objective-C runtime or extra dependencies are needed.

## Requirements

- macOS (compile-time enforced)
- The UniversalAccess private framework (ships with macOS)

## Library usage

`grayscale` also exposes a library crate:

```rust
grayscale::enable();
grayscale::disable();

let on = grayscale::is_enabled();
let new_state = grayscale::toggle();
```

## License

MIT