Support case-insensitive sorting

docs/rules/OrganizeImports.md

@@ -1119,13 +1119,19 @@ the [`OrganizeImports.groups`](#groups) option.
 
 ### Value type
 
-Enum: `Ascii | SymbolsFirst | Keep`
+Enum: `Ascii | AsciiCaseInsensitive | SymbolsFirst | Keep`
 
 #### `Ascii`  
 Sort import statements by ASCII codes. This is the default sorting order
 that the IntelliJ IDEA Scala import optimizer picks ("lexicographically"
 option).
 
+#### `AsciiCaseInsensitive`  
+Sort import statements by ASCII codes, without distinguishing between uppercase
+and lowercase letters. Characters that appear between uppercase and lowercase
+letters in the ASCII table are ordered before any letters. If two strings are
+identical ignoring case, use case-sensitive order to break ties.
+
 #### `SymbolsFirst`  
 Put wildcard imports and grouped imports with braces first, otherwise
 same as `Ascii`. This replicates IntelliJ IDEA Scala’s "scalastyle

scalafix-rules/src/main/scala/scalafix/internal/rule/OrganizeImports.scala

@@ -377,6 +377,11 @@ class OrganizeImports(
       // pretty-print an `Importer` into a single line.
       case ImportsOrder.Ascii =>
         importeesSorted sortBy (i => importerSyntax(i.copy()))
+      case ImportsOrder.AsciiCaseInsensitive =>
+        importeesSorted sortBy (i => {
+          val text = importerSyntax(i.copy())
+          (text.toLowerCase, text)
+        })
       case ImportsOrder.SymbolsFirst =>
         sortImportersSymbolsFirst(importeesSorted)
       case ImportsOrder.Keep =>

scalafix-rules/src/main/scala/scalafix/internal/rule/OrganizeImportsConfig.scala

@@ -13,11 +13,12 @@ sealed trait ImportsOrder
 
 object ImportsOrder {
   case object Ascii extends ImportsOrder
+  case object AsciiCaseInsensitive extends ImportsOrder
   case object SymbolsFirst extends ImportsOrder
   case object Keep extends ImportsOrder
 
   def all: List[ImportsOrder] =
-    List(Ascii, SymbolsFirst, Keep)
+    List(Ascii, AsciiCaseInsensitive, SymbolsFirst, Keep)
 
   implicit def reader: ConfDecoder[ImportsOrder] =
     ReaderUtil.fromMap(all.map(x => x.toString -> x).toMap)

scalafix-tests/input/src/main/scala/test/organizeImports/ImportsOrderAsciiCaseInsensitive.scala

@@ -0,0 +1,22 @@
+/*
+rules = [OrganizeImports]
+OrganizeImports {
+  importsOrder = AsciiCaseInsensitive
+  removeUnused = false
+}
+ */
+package test.organizeImports
+
+import test.organizeImports.Case.b.c
+import test.organizeImports.Case.A.b
+import test.organizeImports.Case.A.C
+import test.organizeImports.Case.b.b
+import test.organizeImports.Case.C.c
+import test.organizeImports.Case.A.A
+import test.organizeImports.Case.C.a
+import test.organizeImports.Case.b.A
+import test.organizeImports.Case.C.B
+import test.organizeImports.Case.A._a
+import test.organizeImports.Case.A._A
+
+object ImportsOrderAsciiCaseInsensitive

scalafix-tests/output/src/main/scala/test/organizeImports/ImportsOrderAsciiCaseInsensitive.scala

@@ -0,0 +1,15 @@
+package test.organizeImports
+
+import test.organizeImports.Case.A._A
+import test.organizeImports.Case.A._a
+import test.organizeImports.Case.A.A
+import test.organizeImports.Case.A.b
+import test.organizeImports.Case.A.C
+import test.organizeImports.Case.b.A
+import test.organizeImports.Case.b.b
+import test.organizeImports.Case.b.c
+import test.organizeImports.Case.C.a
+import test.organizeImports.Case.C.B
+import test.organizeImports.Case.C.c
+
+object ImportsOrderAsciiCaseInsensitive

scalafix-tests/shared/src/main/scala/test/organizeImports/Case.scala

@@ -0,0 +1,21 @@
+package test.organizeImports
+
+object Case {
+  object A {
+    object A
+    object b
+    object C
+    object _a
+    object _A
+  }
+  object b {
+    object A
+    object b
+    object c
+  }
+  object C {
+    object a
+    object B
+    object c
+  }
+}