AvoidInfixSettings: consolidate AvoidInfix params

docs/configuration.md

@@ -2852,22 +2852,27 @@ This rule replaces infix expressions `a op b` with proper method calls `a.op(b)`
 > NB: The rule currently does not support right-associative operators (i.e.,
 > those which end in `:`) which would have had to be rewritten as `b.op(a)`.
 
-The rule takes the following parameters:
+The rule takes the following parameters under `rewrite.avoidInfix`:
 
-- `rewrite.neverInfix` parameter group which consists of `includeFilters` and `excludeFilters`,
-  two lists of regular expressions, which determine which operators are eligible for this rewrite
-  - (since 3.7.18) if a regular expression contains `\\.`, matching will be against
+- `includeFilters` and `excludeFilters`, two lists of regular expressions, which
+  determine which operators are eligible for this rewrite
+  - for this rule to be enabled (that is, for the rewrite to be applied), an infix
+    expression must match `includeFilters` and not match `excludeFilters`
+  - (since 3.8.0) if a regular expression contains `\\.`, matching will be against
     not only the infix operator but also its left-hand-side expression (with the
     non-empty operator part following the last `\\.` in the pattern)
-- (since 3.4.4) `rewrite.allowInfixPlaceholderArg` (default: `true`) will not rewrite infix
+  - (before 3.8.0) these two parameters were nested under `rewrite.neverInfix`
+- `excludePlaceholderArg` (default: `true`) will not rewrite infix
   expressions if the argument is a solo placeholder (`_` or `(_: Type)`)
   - this parameter does not control any other cases with the infix argument containing a
     placeholder character; some of them will never be rewritten as adding parentheses will
     change their syntactic meaning, and others will be rewritten as usual
+  - (before 3.8.0 and since 3.4.4) this parameter was named
+    `rewrite.allowInfixPlaceholderArg`
 
 ```scala mdoc:scalafmt
 rewrite.rules = [AvoidInfix]
-rewrite.neverInfix.excludeFilters."+" = [ "map" ]
+rewrite.avoidInfix.excludeFilters."+" = [ "map" ]
 ---
 a success b
 a error (b, c)
@@ -2885,7 +2890,7 @@ future recover {
 
 ```scala mdoc:scalafmt
 rewrite.rules = [AvoidInfix]
-rewrite.allowInfixPlaceholderArg = false
+rewrite.avoidInfix.excludePlaceholderArg = false
 ---
 _ foo _
 _ bar (_: Int)

scalafmt-core/shared/src/main/scala/org/scalafmt/config/NeverInfixPattern.scala → scalafmt-core/shared/src/main/scala/org/scalafmt/config/AvoidInfixSettings.scala

@@ -5,21 +5,22 @@ import metaconfig.generic.Surface
 
 import java.util.regex.{Matcher, Pattern}
 
-case class NeverInfixPattern(
-    private val includeFilters: Seq[NeverInfixPattern.Filter], // partial match
-    private val excludeFilters: Seq[NeverInfixPattern.Filter] // strict match
+case class AvoidInfixSettings(
+    excludePlaceholderArg: Option[Boolean] = None,
+    private val includeFilters: Seq[AvoidInfixSettings.Filter], // partial match
+    private val excludeFilters: Seq[AvoidInfixSettings.Filter] // strict match
 ) {
-  private[config] def forSbt: Option[NeverInfixPattern] =
+  private[config] def forSbt: Option[AvoidInfixSettings] =
     // if the user customized these, we don't touch
-    if (excludeFilters ne NeverInfixPattern.default.excludeFilters) None
-    else Some(copy(excludeFilters = NeverInfixPattern.sbtExclude))
+    if (excludeFilters ne AvoidInfixSettings.default.excludeFilters) None
+    else Some(copy(excludeFilters = AvoidInfixSettings.sbtExclude))
 
   def matches(lhs: String, op: String): Boolean =
     includeFilters.forall(_.matches(lhs, op)(_.find())) &&
       !excludeFilters.exists(_.matches(lhs, op)(_.matches()))
 }
 
-object NeverInfixPattern {
+object AvoidInfixSettings {
 
   private[config] case class Filter(
       lhs: Option[Pattern],
@@ -55,11 +56,11 @@ object NeverInfixPattern {
     def apply(value: String): Filter = parse(value).get
   }
 
-  implicit lazy val surface: Surface[NeverInfixPattern] =
+  implicit lazy val surface: Surface[AvoidInfixSettings] =
     generic.deriveSurface
-  implicit lazy val codec: ConfCodecEx[NeverInfixPattern] =
+  implicit lazy val codec: ConfCodecEx[AvoidInfixSettings] =
     generic.deriveCodecEx(default).noTypos
-  val default = NeverInfixPattern(
+  val default = AvoidInfixSettings(
     Seq("[\\w\\d_]+").map(Filter.apply),
     Seq(
       "until",

scalafmt-core/shared/src/main/scala/org/scalafmt/config/RewriteSettings.scala

@@ -13,9 +13,18 @@ case class RewriteSettings(
     imports: Imports.Settings = Imports.Settings(),
     preferCurlyFors: PreferCurlyFors.Settings = PreferCurlyFors.Settings(),
     trailingCommas: TrailingCommas = TrailingCommas(),
-    allowInfixPlaceholderArg: Boolean = true,
-    neverInfix: NeverInfixPattern = NeverInfixPattern.default
+    @annotation.DeprecatedName(
+      "allowInfixPlaceholderArg",
+      "Use `avoidInfix.excludePlaceholderArg` instead",
+      "3.8.0"
+    )
+    private val allowInfixPlaceholderArg: Boolean = true,
+    @annotation.ExtraName("neverInfix")
+    avoidInfix: AvoidInfixSettings = AvoidInfixSettings.default
 ) {
+  def isAllowInfixPlaceholderArg: Boolean =
+    avoidInfix.excludePlaceholderArg.getOrElse(allowInfixPlaceholderArg)
+
   def withoutRewrites: RewriteSettings =
     copy(rules = Nil, trailingCommas = trailingCommas.withoutRewrites)
 
@@ -33,7 +42,7 @@ case class RewriteSettings(
   }
 
   private[config] def forSbt: RewriteSettings =
-    neverInfix.forSbt.fold(this)(x => copy(neverInfix = x))
+    avoidInfix.forSbt.fold(this)(x => copy(avoidInfix = x))
 }
 
 object RewriteSettings {

scalafmt-core/shared/src/main/scala/org/scalafmt/rewrite/AvoidInfix.scala

@@ -88,7 +88,7 @@ class AvoidInfix(implicit ctx: RewriteCtx) extends RewriteSession {
     InfixApp.isLeftAssoc(op) && matcher.matches(lhs, op) &&
     (ai.argClause match {
       case ac @ Term.ArgClause(arg :: Nil, _) if !isWrapped(ac) =>
-        !hasPlaceholder(arg, ctx.style.rewrite.allowInfixPlaceholderArg)
+        !hasPlaceholder(arg, ctx.style.rewrite.isAllowInfixPlaceholderArg)
       case _ => true
     }) && (ai.lhs match {
       case lhs: Term.ApplyInfix if hasPlaceholder(lhs, true) =>