# Tailwind Fuse
[
](https://github.com/gaucho-labs/tailwind-fuse)
[
](https://crates.io/crates/tailwind-fuse)
[
](https://docs.rs/tailwind-fuse)
[
](https://github.com/gaucho-labs/tailwind-fuse/actions?query=branch%3Amain)
Two main utils are included in this crate:
1. Fuse: Fuse multiple Tailwind classes, with optional conflict resolution.
> Inspired by [Tailwind Merge](https://github.com/dcastil/tailwind-merge)
2. Variants: Compose type-safe variant classes
> Inspired by [Class Variance Authority](https://github.com/joe-bell/cva)
## Installation
Variants requires the `variant` feature to be enabled.
#### With variant
```bash
cargo add tailwind-fuse --features variant
```
#### Without variant
```bash
cargo add tailwind-fuse
```
## Usage: Fuse
You can use [`tw_join!`] to join Tailwind classes, and [`tw_merge!`] to merge Tailwind Classes handling conflicts.
You can use anything that implements [`AsTailwindClass`]
```rust
use tailwind_fuse::*;
// No conflict resolution
assert_eq!(
"flex items-center justify-center",
tw_join!("flex", "items-center", "justify-center")
);
// Conflict resolution
// Right most class takes precedence
assert_eq!(
"p-4",
tw_merge!("py-2 px-4", "p-4")
);
// Refinements are permitted
assert_eq!(
"p-4 py-2",
tw_merge!("p-4", "py-2")
);
```
You can use Options to exclude certain classes from being merged
```rust
use tailwind_fuse::*;
assert_eq!(
"flex justify-center",
tw_join!("flex", (false).then_some("items-center"), (true).then_some("justify-center"))
)
```
### Custom Tailwind Prefix/Separator
Use [`merge::set_merge_options`] to set global options for [`tw_merge!`] and variant macros.
This can only be set once. Subsequent calls will be ignored.
```rust
use tailwind_fuse::{*, merge::*};
const OPTIONS: MergeOptions = MergeOptions {
prefix: "tw-",
separator: ":",
};
// Before setting options, the default (no prefix) is used
assert_eq!(
"tw-bg-black tw-bg-white",
tw_merge!("tw-bg-black", "tw-bg-white"),
);
set_merge_options(OPTIONS);
assert_eq!(
"tw-bg-white",
tw_merge!("tw-bg-black", "tw-bg-white"),
);
```
## Usage: Variants
Useful for building components with first class support for tailwind. By default, conflicts are merged using [`tw_merge()`].
Each [`TwClass`] represents a UI element with customizable properties (property is a "variant"). Each variant is represented by a [`TwVariant`], which must be an enum with a default case.
The classes are merged in the following order, with the last class takes precedence:
1. Base class from [`TwClass`]
2. Base class from [`TwVariant`]
3. Enum variant class from [`TwVariant`]
4. Override class using [`IntoTailwindClass::with_class`] on the struct or builder
```rust
use tailwind_fuse::*;
// Your Component Type
#[derive(TwClass)]
// Optional base class
#[tw(class = "flex")]
struct Btn {
size: BtnSize,
color: BtnColor,
}
// Variant for size
#[derive(TwVariant)]
enum BtnSize {
#[tw(default, class = "h-9 px-4 py-2")]
Default,
#[tw(class = "h-8 px-3")]
Sm,
#[tw(class = "h-10 px-8")]
Lg,
}
// Variant for color
#[derive(TwVariant)]
enum BtnColor {
#[tw(default, class = "bg-blue-500 text-blue-100")]
Blue,
#[tw(class = "bg-red-500 text-red-100")]
Red,
}
```
You can now use the `Btn` struct to generate Tailwind classes, using builder syntax, or using the struct directly
### Struct Syntax
```rust
let button = Btn {
size: BtnSize::Default,
color: BtnColor::Blue,
};
assert_eq!(
"flex h-9 px-4 py-2 bg-blue-500 text-blue-100",
button.to_class()
);
// Conflicts are resolved (bg-blue-500 is knocked out in favor of override)
assert_eq!(
"flex h-9 px-4 py-2 text-blue-100 bg-green-500",
button.with_class("bg-green-500")
);
```
### Builder Syntax
You access the builder using the `variants` method. Every variant that is not provided will be replaced with the default variant.
```rust
assert_eq!(
"flex h-8 px-3 bg-red-500 text-red-100",
Btn::builder()
.size(BtnSize::Sm)
.color(BtnColor::Red)
.to_class()
);
assert_eq!(
"flex h-8 px-3 text-red-100 bg-green-500",
Btn::builder()
.size(BtnSize::Sm)
.color(BtnColor::Red)
.with_class("bg-green-500")
);
```
#### VSCode Intellisense
You can enable autocompletion inside `#[tw()]` using the steps below:
1. [Install the "Tailwind CSS IntelliSense" Visual Studio Code extension](https://marketplace.visualstudio.com/items?itemName=bradlc.vscode-tailwindcss)
2. Add the following to your [`settings.json`](https://code.visualstudio.com/docs/getstarted/settings):
```json
{
"tailwindCSS.experimental.classRegex": [
["#[tw\\\\([^\\]]*class\\s*=\\s*\"([^\"]*)\"\\)]", "\"([^\"]*)\""]
]
}
```