chore(fmt): rename and alias params config varaint for clarity

crates/config/src/fmt.rs

@@ -142,8 +142,9 @@ pub enum SingleLineBlockStyle {
 #[derive(Clone, Copy, Debug, Default, PartialEq, Eq, Serialize, Deserialize)]
 #[serde(rename_all = "snake_case")]
 pub enum MultilineFuncHeaderStyle {
-    /// Write function parameters multiline first.
-    ParamsFirst,
+    /// Always write function parameters multiline.
+    #[serde(alias = "params_first")] // alias for backwards compatibility
+    ParamsAlways,
     /// Write function parameters multiline first when there is more than one param.
     ParamsFirstMulti,
     /// Write function attributes multiline first.
@@ -162,7 +163,7 @@ impl MultilineFuncHeaderStyle {
     }
 
     pub fn params_first(&self) -> bool {
-        matches!(self, Self::ParamsFirst | Self::ParamsFirstMulti)
+        matches!(self, Self::ParamsAlways | Self::ParamsFirstMulti)
     }
 
     pub fn attrib_first(&self) -> bool {

crates/fmt/README.md

@@ -115,7 +115,7 @@ The formatter supports multiple configuration options defined in `foundry.toml`.
 | `style` | `space` | The style of indentation. Options: `space`, `tab`. |
 | `bracket_spacing` | `false` | Print spaces between brackets. |
 | `int_types` | `long` | Style for `uint256`/`int256` types. Options: `long`, `short`, `preserve`. |
-| `multiline_func_header` | `attributes_first` | The style of multiline function headers. Options: `attributes_first`, `params_first`, `params_first_multi`, `all`, `all_params`. |
+| `multiline_func_header` | `attributes_first` | The style of multiline function headers. Options: `attributes_first`, `params_always`, `params_first_multi`, `all`, `all_params`. |
 | `quote_style` | `double` | The style of quotation marks. Options: `double`, `single`, `preserve`. |
 | `number_underscore` | `preserve` | The style of underscores in number literals. Options: `preserve`, `remove`, `thousands`. |
 | `hex_underscore` | `remove` | The style of underscores in hex literals. Options: `preserve`, `remove`, `bytes`. |
@@ -127,6 +127,7 @@ The formatter supports multiple configuration options defined in `foundry.toml`.
 | `sort_imports` | `false` | Sort import statements alphabetically in groups. A group is a set of imports separated by a newline. |
 | `pow_no_space` | `false` | Suppress spaces around the power operator (`**`). |
 
+> Check [`FormatterConfig`](../config/src/fmt.rs) for a more detailed explanation.
 
 ### Inline Configuration
 

crates/fmt/src/state/sol.rs

@@ -460,7 +460,7 @@ impl<'ast> State<'_, 'ast> {
         self.s.cbox(-self.ind);
         let header_style = self.config.multiline_func_header;
         let params_format = match header_style {
-            MultilineFuncHeaderStyle::ParamsFirst => ListFormat::always_break(),
+            MultilineFuncHeaderStyle::ParamsAlways => ListFormat::always_break(),
             MultilineFuncHeaderStyle::AllParams
                 if !header.parameters.is_empty() && !self.can_header_be_inlined(header) =>
             {

crates/fmt/testdata/FunctionDefinition/params-first.fmt.sol → crates/fmt/testdata/FunctionDefinition/params-always.fmt.sol

@@ -1,5 +1,5 @@
 // config: line_length = 60
-// config: multiline_func_header = "params_first"
+// config: multiline_func_header = "params_always"
 interface FunctionInterfaces {
     function noParamsNoModifiersNoReturns();
 

crates/forge/tests/cli/fmt.rs

@@ -78,14 +78,14 @@ Diff in stdin:
 1   1    | // SPDX-License-Identifier: MIT
 2        |-pragma         solidity  =0.8.30    ;
     2    |+pragma solidity =0.8.30;
-3   3    | 
+...
 4        |-contract  Test  {
 5        |-    uint256    public    value ;
 6        |-    function   setValue ( uint256   _value )   public   {
 7        |-        value   =   _value ;
     4    |+contract Test {
     5    |+    uint256 public value;
-    6    |+
+...
     7    |+    function setValue(uint256 _value) public {
     8    |+        value = _value;
 8   9    |     }
@@ -103,3 +103,26 @@ forgetest!(fmt_stdin_original, |_prj, cmd| {
     cmd.stdin(FORMATTED.as_bytes());
     cmd.assert_success().stdout_eq(FORMATTED.as_bytes());
 });
+
+// Test that fmt can format a simple contract file
+forgetest_init!(fmt_file_config_parms_first, |prj, cmd| {
+    prj.create_file(
+        "foundry.toml",
+        r#"
+[fmt]
+multiline_func_header = 'params_first'
+"#,
+    );
+    prj.add_raw_source("FmtTest.sol", FORMATTED);
+    cmd.forge_fuse().args(["fmt", "--check"]).arg("src/FmtTest.sol");
+    cmd.assert_failure().stdout_eq(str![[r#"
+Diff in src/FmtTest.sol:
+...
+7        |-    function setValue(uint256 _value) public {
+    7    |+    function setValue(
+    8    |+        uint256 _value
+    9    |+    ) public {
+...
+
+"#]]);
+});