feat: add tailwind support for attr values

README.md

@@ -1,11 +1,10 @@
 # leptosfmt
+
 [![crates.io](https://img.shields.io/crates/v/leptosfmt.svg)](https://crates.io/crates/leptosfmt)
 [![build](https://img.shields.io/github/actions/workflow/status/bram209/leptosfmt/ci.yml)](https://github.com/bram209/leptosfmt/actions/workflows/ci.yml?query=branch%3Amain)
 [![security](https://img.shields.io/github/actions/workflow/status/bram209/leptosfmt/security-audit.yml?label=%F0%9F%9B%A1%EF%B8%8F%20security%20audit)](https://github.com/bram209/leptosfmt/actions/workflows/security-audit.yml?query=branch%3Amain)
 [![discord](https://img.shields.io/discord/1031524867910148188?color=%237289DA&label=discord%20%23leptosfmt)](https://discord.gg/YdRAhS7eQB)
 
-
-
 A formatter for the leptos view! macro
 
 All notable changes are documented in: [CHANGELOG.md](./CHANGELOG.md)
@@ -27,29 +26,42 @@ Arguments:
   [INPUT_PATTERNS]...  A space separated list of file, directory or glob
 
 Options:
-  -m, --max-width <MAX_WIDTH>      Maximum width of each line
-  -t, --tab-spaces <TAB_SPACES>    Number of spaces per tab
-  -c, --config-file <CONFIG_FILE>  Configuration file
-  -s, --stdin                      Format stdin and write to stdout
-  -r, --rustfmt                    Format with rustfmt after formatting with leptosfmt (requires stdin)
-      --override-macro-names 
-        <OVERRIDE_MACRO_NAMES>...  Override formatted macro names
-  -q, --quiet                      
-      --check                      Check if the file is correctly formatted. Exit with code 1 if not
-  -h, --help                       Print help
-  -V, --version                    Print version
+  -m, --max-width <MAX_WIDTH>
+          Maximum width of each line
+  -t, --tab-spaces <TAB_SPACES>
+          Number of spaces per tab
+  -c, --config-file <CONFIG_FILE>
+          Configuration file
+  -s, --stdin
+          Format stdin and write to stdout
+  -r, --rustfmt
+          Format with rustfmt after formatting with leptosfmt (requires stdin)
+      --override-macro-names <OVERRIDE_MACRO_NAMES>...
+          Override formatted macro names
+  -e, --experimental-tailwind
+          Format attributes with tailwind
+      --tailwind-attr-names <TAILWIND_ATTR_NAMES>...
+          Override attributes to be formatted with tailwind [default: class]
+  -q, --quiet
+
+      --check
+          Check if the file is correctly formatted. Exit with code 1 if not
+  -h, --help
+          Print help
+  -V, --version
+          Print version
 ```
 
 ## Using with Rust Analyzer
 
 You can set the `rust-analyzer.rustfmt.overrideCommand` setting.
 
-
 ```json
   "rust-analyzer.rustfmt.overrideCommand": ["leptosfmt", "--stdin", "--rustfmt"]
 ```
 
 And **you must** configure `rustfmt` to use the correct edition, place a `rustfmt.toml` file in the root of your project:
+
 ```toml
 edition = "2021"
 # (optional) other config...
@@ -58,6 +70,7 @@ edition = "2021"
 > Note: For VSCode users, I recommend to use workpsace settings (CMD + shift + p -> Open workspace settings), so that you can only configure `leptosfmt` for workpsaces that are using leptos. For Neovim users, I recommend using [neoconf.nvim](https://github.com/folke/neoconf.nvim) for managing project-local LSP configuration.
 
 ## Configuration
+
 You can configure all settings through a `leptosfmt.toml` file.
 
 ```toml
@@ -67,6 +80,11 @@ indentation_style = "Auto" # "Tabs", "Spaces" or "Auto"
 newline_style = "Auto" # "Unix", "Windows" or "Auto"
 attr_value_brace_style = "WhenRequired" # "Always", "AlwaysUnlessLit", "WhenRequired" or "Preserve"
 macro_names = [ "leptos::view", "view" ] # Macro names which will be formatted
+
+# Attribute values can be formatted by custom formatters
+# Every attribute name may only select one formatter (this might change later on)
+[attr_values]
+class = "Tailwind" # "Tailwind" is the only attribute value formatter available for now
 ```
 
 To see what each setting does, the see [configuration docs](./docs/configuration.md)

cli/src/main.rs

@@ -49,6 +49,14 @@ struct Args {
     #[arg(long, num_args=1.., value_delimiter= ' ')]
     override_macro_names: Option<Vec<String>>,
 
+    /// Format attributes with tailwind
+    #[arg(short, long, default_value = "false")]
+    experimental_tailwind: bool,
+
+    /// Override attributes to be formatted with tailwind
+    #[arg(long, num_args=1.., value_delimiter= ' ', default_value = "class")]
+    tailwind_attr_names: Vec<String>,
+
     #[arg(
         short,
         long,
@@ -262,6 +270,19 @@ fn create_settings(args: &Args) -> anyhow::Result<FormatterSettings> {
     if let Some(macro_names) = args.override_macro_names.to_owned() {
         settings.macro_names = macro_names;
     }
+
+    if args.experimental_tailwind {
+        settings.attr_values = args
+            .tailwind_attr_names
+            .iter()
+            .map(|attr_name| {
+                (
+                    attr_name.to_owned(),
+                    leptosfmt_formatter::ExpressionFormatter::Tailwind,
+                )
+            })
+            .collect();
+    }
     Ok(settings)
 }
 

formatter/Cargo.toml

@@ -13,12 +13,13 @@ leptosfmt-prettyplease.workspace = true
 rstml = "0.11.2"
 syn = { workspace = true }
 proc-macro2 = { workspace = true }
-thiserror = "1.0.40"
+thiserror = "1.0.61"
 crop = "0.3.0"
-serde = { version = "1.0.163", features = ["derive"] }
-quote = "1.0.26"
+serde = { version = "1.0.203", features = ["derive"] }
+quote = "1.0.36"
+rustywind_core = "0.1.2"
 
 [dev-dependencies]
-indoc = "2.0.1"
-insta = "1.28.0"
-quote = "1.0.26"
+indoc = "2.0.5"
+insta = "1.39.0"
+quote = "1.0.36"

formatter/src/formatter/attribute.rs

@@ -3,6 +3,8 @@ use syn::{spanned::Spanned, Expr};
 
 use crate::{formatter::Formatter, AttributeValueBraceStyle as Braces};
 
+use super::ExpressionFormatter;
+
 impl Formatter<'_> {
     pub fn attribute(&mut self, attribute: &NodeAttribute) {
         self.flush_comments(attribute.span().start().line - 1);
@@ -16,24 +18,32 @@ impl Formatter<'_> {
         self.node_name(&attribute.key);
 
         if let Some(value) = attribute.value() {
+            let formatter = self
+                .settings
+                .attr_values
+                .get(&attribute.key.to_string())
+                .copied();
+
             self.printer.word("=");
-            self.attribute_value(value);
+            self.attribute_value(value, formatter);
         }
     }
 
-    fn attribute_value(&mut self, value: &Expr) {
+    fn attribute_value(&mut self, value: &Expr, formatter: Option<ExpressionFormatter>) {
         match (self.settings.attr_value_brace_style, value) {
-            (Braces::Always, syn::Expr::Block(_)) => self.node_value_expr(value, false, false),
+            (Braces::Always, syn::Expr::Block(_)) => {
+                self.node_value_expr(value, false, false, formatter)
+            }
             (Braces::AlwaysUnlessLit, syn::Expr::Block(_) | syn::Expr::Lit(_)) => {
-                self.node_value_expr(value, false, true)
+                self.node_value_expr(value, false, true, formatter)
             }
             (Braces::Always | Braces::AlwaysUnlessLit, _) => {
                 self.printer.word("{");
-                self.node_value_expr(value, false, false);
+                self.node_value_expr(value, false, false, formatter);
                 self.printer.word("}");
             }
-            (Braces::WhenRequired, _) => self.node_value_expr(value, true, true),
-            (Braces::Preserve, _) => self.node_value_expr(value, false, false),
+            (Braces::WhenRequired, _) => self.node_value_expr(value, true, true, formatter),
+            (Braces::Preserve, _) => self.node_value_expr(value, false, false, formatter),
         }
     }
 }

formatter/src/formatter/expr.rs

@@ -4,6 +4,8 @@ use syn::{spanned::Spanned, Block, Expr, ExprBlock, ExprLit, LitStr};
 
 use crate::{formatter::Formatter, get_text_beween_spans, view_macro::ViewMacroFormatter};
 
+use super::ExpressionFormatter;
+
 fn trim_start_with_max(str: &str, max_chars: usize) -> &str {
     let mut chars = 0;
     str.trim_start_matches(|c: char| {
@@ -65,27 +67,31 @@ impl Formatter<'_> {
             if unwrap_single_expr_blocks
                 || (unwrap_single_lit_blocks && matches!(single_expr, syn::Expr::Lit(_)))
             {
-                self.expr(single_expr);
+                self.expr(single_expr, None);
             } else {
                 self.printer.word("{");
-                self.expr(single_expr);
+                self.expr(single_expr, None);
                 self.printer.word("}");
             }
             return;
         }
 
-        self.expr(&Expr::Block(ExprBlock {
-            attrs: vec![],
-            label: None,
-            block: block.clone(),
-        }))
+        self.expr(
+            &Expr::Block(ExprBlock {
+                attrs: vec![],
+                label: None,
+                block: block.clone(),
+            }),
+            None,
+        )
     }
 
     pub fn node_value_expr(
         &mut self,
         value: &syn::Expr,
         unwrap_single_expr_blocks: bool,
         unwrap_single_lit_blocks: bool,
+        formatter: Option<ExpressionFormatter>,
     ) {
         // if single line expression, format as '{expr}' instead of '{ expr }' (prettyplease inserts a space)
         if let syn::Expr::Block(expr_block) = value {
@@ -98,18 +104,22 @@ impl Formatter<'_> {
             }
         }
 
-        self.expr(value)
+        self.expr(value, formatter)
     }
 
-    fn expr(&mut self, expr: &syn::Expr) {
+    fn expr(&mut self, expr: &syn::Expr, formatter: Option<ExpressionFormatter>) {
         let span = expr.span();
         self.flush_comments(span.start().line - 1);
         if let syn::Expr::Lit(ExprLit {
             lit: syn::Lit::Str(lit_str),
             ..
         }) = expr
         {
-            self.literal_str(lit_str);
+            if let Some(formatter) = formatter {
+                formatter.format(self, lit_str.value())
+            } else {
+                self.literal_str(lit_str);
+            }
             return;
         }
 

formatter/src/formatter/mod.rs

@@ -1,4 +1,5 @@
 use std::collections::HashMap;
+use std::fmt::Debug;
 
 use crop::Rope;
 
@@ -10,6 +11,7 @@ mod expr;
 mod fragment;
 mod mac;
 mod node;
+mod tailwind;
 
 pub use mac::format_macro;
 pub use mac::{ParentIndent, ViewMacro};
@@ -40,26 +42,42 @@ pub enum NewlineStyle {
     Windows,
 }
 
+#[derive(Clone, Copy, Debug, PartialEq, Deserialize, Serialize)]
+pub enum ExpressionFormatter {
+    Tailwind,
+}
+
+impl ExpressionFormatter {
+    pub fn format(&self, formatter: &mut Formatter, value: String) {
+        match self {
+            Self::Tailwind => formatter.tailwind_expr(value),
+        }
+    }
+}
+
 #[derive(Clone, Debug, Deserialize, Serialize)]
 #[serde(default)]
 pub struct FormatterSettings {
-    // Maximum width of each line
+    /// Maximum width of each line
     pub max_width: usize,
 
-    // Number of spaces per tab
+    /// Number of spaces per tab
     pub tab_spaces: usize,
 
-    // Determines indentation style (tabs or spaces)
+    /// Determines indentation style (tabs or spaces)
     pub indentation_style: IndentationStyle,
 
-    // Determines line ending (unix or windows)
+    /// Determines line ending (unix or windows)
     pub newline_style: NewlineStyle,
 
-    // Determines placement of braces around single expression attribute values
+    /// Determines placement of braces around single expression attribute values
     pub attr_value_brace_style: AttributeValueBraceStyle,
 
-    // Determines macros to be formatted. Default: leptos::view, view
+    /// Determines macros to be formatted. Default: leptos::view, view
     pub macro_names: Vec<String>,
+
+    /// Determines whether to format attribute values with a specific formatter (e.g. tailwind)
+    pub attr_values: HashMap<String, ExpressionFormatter>,
 }
 
 impl Default for FormatterSettings {
@@ -71,6 +89,7 @@ impl Default for FormatterSettings {
             indentation_style: IndentationStyle::Auto,
             newline_style: NewlineStyle::Auto,
             macro_names: vec!["leptos::view".to_string(), "view".to_string()],
+            attr_values: HashMap::new(),
         }
     }
 }

formatter/src/formatter/tailwind.rs

@@ -0,0 +1,18 @@
+use rustywind_core::sorter::{self, FinderRegex};
+
+use crate::Formatter;
+
+impl Formatter<'_> {
+    pub fn tailwind_expr(&mut self, attr_value: String) {
+        static OPTIONS: sorter::Options = sorter::Options {
+            regex: FinderRegex::DefaultRegex,
+            sorter: sorter::Sorter::DefaultSorter,
+            allow_duplicates: true,
+        };
+
+        let sorted = sorter::sort_classes(&attr_value, &OPTIONS);
+        self.printer.word("\"");
+        self.printer.word(sorted);
+        self.printer.word("\"");
+    }
+}

formatter/src/source_file.rs

@@ -79,7 +79,7 @@ fn format_source(
 mod tests {
     use indoc::indoc;
 
-    use crate::IndentationStyle;
+    use crate::{ExpressionFormatter, IndentationStyle};
 
     use super::*;
 
@@ -753,4 +753,34 @@ mod tests {
 
         assert_eq!(result, expected);
     }
+
+    #[test]
+    fn tailwind() {
+        let source = indoc! {r#"
+            view! { 
+                <button class="text-white px-4 sm:px-8 py-2 sm:py-3 bg-sky-700 hover:bg-sky-800">Test</button>
+                <button class="some non tailwind classes">Test</button>
+                <button class="some mixed classes non tailwind classes text-white px-4 sm:px-8 py-2 sm:py-3">Test</button>
+            }"#};
+
+        let result = format_file_source(
+            source,
+            &FormatterSettings {
+                attr_values: [("class".to_string(), ExpressionFormatter::Tailwind)]
+                    .into_iter()
+                    .collect(),
+                ..Default::default()
+            },
+        )
+        .unwrap();
+        insta::assert_snapshot!(result, @r###"
+        view! {
+            <button class="py-2 px-4 text-white sm:py-3 sm:px-8 bg-sky-700 hover:bg-sky-800">Test</button>
+            <button class="some non tailwind classes">Test</button>
+            <button class="py-2 px-4 text-white sm:py-3 sm:px-8 some mixed classes non tailwind classes">
+                Test
+            </button>
+        }
+        "###);
+    }
 }