Config-style: allow optimizing defn site clause

Initially, we would only optimize around call-site argument clauses.
Now let's add defn-site parameter clauses as well.

Also, let's rename the optimizer parameters to clarify the fact that
they don't necessarily _force_ config-style formatting.

docs/configuration.md

@@ -216,9 +216,9 @@ top-level.
       neverBeforeJsNative = true
       sometimesBeforeColonInMethodReturnType = false
     }
-    runner.optimizer {
-      forceConfigStyleMinSpan = 500
-      forceConfigStyleMinArgCount = 5
+    runner.optimizer.callSite {
+      minSpan = 500
+      minCount = 5
     }
 ```
 
@@ -2822,7 +2822,7 @@ object a {
 ### Forcing config style
 
 When `newlines.configStyleXxxSite.forceIfOptimized` is enabled and
-[call-site clause optimization](#route-search-optimizations-call-site-clause)
+[route search optimization](#route-search-optimizations-arg-or-param-clause)
 is applicable to a clause, the formatter will force config-style formatting.
 
 By default, takes the same value as
@@ -2831,8 +2831,7 @@ By default, takes the same value as
 ```scala mdoc:scalafmt
 newlines.configStyleCallSite.forceIfOptimized = true
 newlines.configStyleDefnSite.forceIfOptimized = false
-runner.optimizer.forceConfigStyleMinSpan = 5
-runner.optimizer.forceConfigStyleMinArgCount = 2
+runner.optimizer.callSite { minSpan = 5, minCount = 2 }
 maxColumn = 60
 ---
 object a {
@@ -5357,24 +5356,25 @@ and this optimization is enabled when:
 runner.optimizer.dequeueOnNewStatements
 ```
 
-#### Route search optimizations: call-site clause
+#### Route search optimizations: arg or param clause
 
 Similar to statements above, we might create a new priority queue when we
-encounter a long-enough call-site clause.
+encounter a long-enough call-site argument or defn-site parameter clause.
 
 ```scala mdoc:defaults
-runner.optimizer.forceConfigStyleMinSpan
-runner.optimizer.forceConfigStyleMinArgCount
+runner.optimizer.callSite
+runner.optimizer.defnSite
 ```
 
 This optimization is enabled when all these criteria are satisfied:
 
-- `runner.optimizer.forceConfigStyleMinSpan`:
+- `xxxSite.minSpan`:
   must be non-negative, and the character distance between the matching
   parentheses, excluding any whitespace, must exceed this value
   (prior to v3.8.1, this parameter was called `forceConfigStyleOnOffset`)
-- `runner.optimizer.forceConfigStyleMinArgCount`:
+- `xxxSite.minCount`:
   must be positive and may not exceed the number of arguments
+  (prior to v3.8.2, this parameter was called `forceConfigStyleMinCount`)
 
 > These parameters cannot be [overridden within a file](#for-code-block)
 

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

@@ -51,18 +51,32 @@ case class ScalafmtOptimizer(
     disableOptimizationsInsideSensitiveAreas: Boolean = true,
     pruneSlowStates: Boolean = true,
     recurseOnBlocks: Boolean = true,
-    @annotation.ExtraName("forceConfigStyleOnOffset")
-    forceConfigStyleMinSpan: Int = 150,
-    forceConfigStyleMinArgCount: Int = 2,
+    @annotation.ExtraName("forceConfigStyleOnOffset") @annotation.DeprecatedName(
+      "forceConfigStyleMinSpan",
+      "Use `callSite.minSpan` instead",
+      "3.8.2",
+    )
+    private val forceConfigStyleMinSpan: Int = 150,
+    @annotation.DeprecatedName(
+      "forceConfigStyleMinArgCount",
+      "Use `callSite.minCount` instead",
+      "3.8.2",
+    )
+    private val forceConfigStyleMinArgCount: Int = 2,
+    private val callSite: Option[ClauseElement] = None,
+    private val defnSite: ClauseElement = ClauseElement.default,
 ) {
-  def getCallSite: ClauseElement = ClauseElement(
+  def getCallSite: ClauseElement = callSite.getOrElse(ClauseElement(
     minSpan = forceConfigStyleMinSpan,
     minCount = forceConfigStyleMinArgCount,
-  )
+  ))
+  def getDefnSite: ClauseElement = defnSite
 
-  private[config] def conservative: ScalafmtOptimizer =
+  private[config] def conservative: ScalafmtOptimizer = {
     // The tests were not written in this style
-    copy(forceConfigStyleMinSpan = 500, forceConfigStyleMinArgCount = 5)
+    val cfg = ClauseElement(minSpan = 500, minCount = 5)
+    copy(callSite = Some(cfg), defnSite = cfg)
+  }
 
 }
 
@@ -89,4 +103,12 @@ object ScalafmtOptimizer {
     val isEnabled: Boolean = minSpan >= 0 && minCount > 0
   }
 
+  private[config] object ClauseElement {
+    val default = ClauseElement()
+    implicit val surface: generic.Surface[ClauseElement] = generic
+      .deriveSurface[ClauseElement]
+    implicit val codec: ConfCodecEx[ClauseElement] = generic
+      .deriveCodecEx(default).noTypos
+  }
+
 }

scalafmt-core/shared/src/main/scala/org/scalafmt/internal/FormatOps.scala

@@ -1033,12 +1033,13 @@ class FormatOps(
 
   def getForceConfigStyle: (Set[Int], Set[Int]) = {
     val callSite = initStyle.runner.optimizer.getCallSite
-    if (callSite.isEnabled) {
+    val defnSite = initStyle.runner.optimizer.getDefnSite
+    if (callSite.isEnabled || defnSite.isEnabled) {
       val clearQueues = Set.newBuilder[Int]
       val forces = Set.newBuilder[Int]
       def process(clause: Member.SyntaxValuesClause, ftOpen: FormatToken)(
           cfg: ScalafmtOptimizer.ClauseElement,
-      ): Unit = matchingOpt(ftOpen.left).foreach { close =>
+      ): Unit = if (cfg.isEnabled) matchingOpt(ftOpen.left).foreach { close =>
         val values = clause.values
         if (
           values.lengthCompare(cfg.minCount) >= 0 &&
@@ -1052,10 +1053,13 @@ class FormatOps(
         case ft @ FormatToken(_: T.LeftParen, _, m) => m.leftOwner match {
             case t: Term.ArgClause if !t.parent.exists(_.is[Term.ApplyInfix]) =>
               process(t, ft)(callSite)
+            case t: Term.ParamClause => process(t, ft)(defnSite)
             case _ =>
           }
         case ft @ FormatToken(_: T.LeftBracket, _, m) => m.leftOwner match {
             case t: Type.ArgClause => process(t, ft)(callSite)
+            case t: Type.ParamClause => process(t, ft)(defnSite)
+            case t: Type.FuncParamClause => process(t, ft)(defnSite)
             case _ =>
           }
         case _ =>

scalafmt-tests/src/test/resources/newlines/source_classic.stat

@@ -7608,7 +7608,7 @@ newlines.configStyleCallSite.prefer = true
 danglingParentheses.callSite = true
 binPack.unsafeCallSite = always
 maxColumn = 30
-runner.optimizer.forceConfigStyleMinSpan = 20
+runner.optimizer.callSite { minSpan = 20, minCount = 5 }
 ===
 object Main {
   val bar1 = foo1(
@@ -7660,7 +7660,7 @@ newlines.configStyleDefnSite.prefer = true
 danglingParentheses.defnSite = true
 binPack.unsafeDefnSite = always
 maxColumn = 30
-runner.optimizer.forceConfigStyleMinSpan = 20
+runner.optimizer.defnSite { minSpan = 20, minCount = 5 }
 ===
 object Main {
   def foo1(
@@ -7698,16 +7698,17 @@ object Main {
       x1: X, x2: X, x3: X,
       x4: X, xs: X*
   ): Set[Int]
-  def foo3(x1: X, x2: X,
-      x3: X, x4: X, xs: X*)
-      : Set[Int]
+  def foo3(
+      x1: X, x2: X, x3: X,
+      x4: X, xs: X*
+  ): Set[Int]
 }
 <<< binPack.callSite with !configStyle, danglingParentheses
 newlines.configStyleCallSite.prefer = false
 danglingParentheses.callSite = true
 binPack.unsafeCallSite = always
 maxColumn = 30
-runner.optimizer.forceConfigStyleMinSpan = 20
+runner.optimizer.callSite { minSpan = 20, minCount = 5 }
 ===
 object Main {
   val bar1 = foo1(
@@ -7751,7 +7752,7 @@ newlines.configStyleDefnSite.prefer = false
 danglingParentheses.defnSite = true
 binPack.unsafeDefnSite = always
 maxColumn = 30
-runner.optimizer.forceConfigStyleMinSpan = 20
+runner.optimizer.defnSite { minSpan = 20, minCount = 5 }
 ===
 object Main {
   def foo1(
@@ -7802,7 +7803,7 @@ newlines.configStyleCallSite.prefer = true
 danglingParentheses.callSite = false
 binPack.unsafeCallSite = always
 maxColumn = 30
-runner.optimizer.forceConfigStyleMinSpan = 20
+runner.optimizer.callSite { minSpan = 20, minCount = 5 }
 ===
 object Main {
   val bar1 = foo1(
@@ -7854,7 +7855,7 @@ newlines.configStyleDefnSite.prefer = true
 danglingParentheses.defnSite = false
 binPack.unsafeDefnSite = always
 maxColumn = 30
-runner.optimizer.forceConfigStyleMinSpan = 20
+runner.optimizer.defnSite { minSpan = 20, minCount = 5 }
 ===
 object Main {
   def foo1(
@@ -7892,16 +7893,17 @@ object Main {
       x1: X, x2: X, x3: X,
       x4: X, xs: X*
   ): Set[Int]
-  def foo3(x1: X, x2: X,
-      x3: X, x4: X, xs: X*)
-      : Set[Int]
+  def foo3(
+      x1: X, x2: X, x3: X,
+      x4: X, xs: X*
+  ): Set[Int]
 }
 <<< binPack.callSite with !configStyle, !danglingParentheses
 newlines.configStyleCallSite.prefer = false
 danglingParentheses.callSite = false
 binPack.unsafeCallSite = always
 maxColumn = 30
-runner.optimizer.forceConfigStyleMinSpan = 20
+runner.optimizer.callSite { minSpan = 20, minCount = 5 }
 ===
 object Main {
   val bar1 = foo1(
@@ -7939,7 +7941,7 @@ newlines.configStyleDefnSite.prefer = false
 danglingParentheses.defnSite = false
 binPack.unsafeDefnSite = always
 maxColumn = 30
-runner.optimizer.forceConfigStyleMinSpan = 20
+runner.optimizer.defnSite { minSpan = 20, minCount = 5 }
 ===
 object Main {
   def foo1(

scalafmt-tests/src/test/resources/newlines/source_fold.stat

@@ -7138,7 +7138,7 @@ newlines.configStyleCallSite.prefer = true
 danglingParentheses.callSite = true
 binPack.unsafeCallSite = always
 maxColumn = 30
-runner.optimizer.forceConfigStyleMinSpan = 20
+runner.optimizer.callSite { minSpan = 20, minCount = 5 }
 ===
 object Main {
   val bar1 = foo1(
@@ -7187,7 +7187,7 @@ newlines.configStyleDefnSite.prefer = true
 danglingParentheses.defnSite = true
 binPack.unsafeDefnSite = always
 maxColumn = 30
-runner.optimizer.forceConfigStyleMinSpan = 20
+runner.optimizer.defnSite { minSpan = 20, minCount = 5 }
 ===
 object Main {
   def foo1(
@@ -7238,7 +7238,7 @@ newlines.configStyleCallSite.prefer = false
 danglingParentheses.callSite = true
 binPack.unsafeCallSite = always
 maxColumn = 30
-runner.optimizer.forceConfigStyleMinSpan = 20
+runner.optimizer.callSite { minSpan = 20, minCount = 5 }
 ===
 object Main {
   val bar1 = foo1(
@@ -7278,7 +7278,7 @@ newlines.configStyleDefnSite.prefer = false
 danglingParentheses.defnSite = true
 binPack.unsafeDefnSite = always
 maxColumn = 30
-runner.optimizer.forceConfigStyleMinSpan = 20
+runner.optimizer.defnSite { minSpan = 20, minCount = 5 }
 ===
 object Main {
   def foo1(
@@ -7329,7 +7329,7 @@ newlines.configStyleCallSite.prefer = true
 danglingParentheses.callSite = false
 binPack.unsafeCallSite = always
 maxColumn = 30
-runner.optimizer.forceConfigStyleMinSpan = 20
+runner.optimizer.callSite { minSpan = 20, minCount = 5 }
 ===
 object Main {
   val bar1 = foo1(
@@ -7378,7 +7378,7 @@ newlines.configStyleDefnSite.prefer = true
 danglingParentheses.defnSite = false
 binPack.unsafeDefnSite = always
 maxColumn = 30
-runner.optimizer.forceConfigStyleMinSpan = 20
+runner.optimizer.defnSite { minSpan = 20, minCount = 5 }
 ===
 object Main {
   def foo1(
@@ -7411,19 +7411,21 @@ object Main {
       xs: X*): Set[Int]
   def foo1(x1: X, x2: X,
       xs: X*): Set[Int]
-  def foo2(x1: X, x2: X,
-      x3: X, x4: X, xs: X*)
-      : Set[Int]
-  def foo3(x1: X, x2: X,
-      x3: X, x4: X, xs: X*)
-      : Set[Int]
+  def foo2(
+      x1: X, x2: X, x3: X,
+      x4: X, xs: X*
+  ): Set[Int]
+  def foo3(
+      x1: X, x2: X, x3: X,
+      x4: X, xs: X*
+  ): Set[Int]
 }
 <<< binPack.callSite with !configStyle, !danglingParentheses
 newlines.configStyleCallSite.prefer = false
 danglingParentheses.callSite = false
 binPack.unsafeCallSite = always
 maxColumn = 30
-runner.optimizer.forceConfigStyleMinSpan = 20
+runner.optimizer.callSite { minSpan = 20, minCount = 5 }
 ===
 object Main {
   val bar1 = foo1(
@@ -7462,7 +7464,7 @@ newlines.configStyleDefnSite.prefer = false
 danglingParentheses.defnSite = false
 binPack.unsafeDefnSite = always
 maxColumn = 30
-runner.optimizer.forceConfigStyleMinSpan = 20
+runner.optimizer.defnSite { minSpan = 20, minCount = 5 }
 ===
 object Main {
   def foo1(