Create sort groups based on newlines

Author: MQuy

src/services/organizeImports.ts

@@ -15,16 +15,15 @@ namespace ts.OrganizeImports {
         preferences: UserPreferences,
         skipDestructiveCodeActions?: boolean
     ) {
-
         const changeTracker = textChanges.ChangeTracker.fromContext({ host, formatContext, preferences });
 
         const coalesceAndOrganizeImports = (importGroup: readonly ImportDeclaration[]) => stableSort(
             coalesceImports(removeUnusedImports(importGroup, sourceFile, program, skipDestructiveCodeActions)),
             (s1, s2) => compareImportsOrRequireStatements(s1, s2));
 
         // All of the old ImportDeclarations in the file, in syntactic order.
-        const topLevelImportDecls = sourceFile.statements.filter(isImportDeclaration);
-        organizeImportsWorker(topLevelImportDecls, coalesceAndOrganizeImports);
+        const topLevelGroupImportDecls = groupImportsByNewlines(sourceFile.statements.filter(isImportDeclaration), host, formatContext);
+        topLevelGroupImportDecls.forEach(topLevelGroupImportDecl => organizeImportsWorker(topLevelGroupImportDecl, coalesceAndOrganizeImports));
 
         // All of the old ExportDeclarations in the file, in syntactic order.
         const topLevelExportDecls = sourceFile.statements.filter(isExportDeclaration);
@@ -33,8 +32,8 @@ namespace ts.OrganizeImports {
         for (const ambientModule of sourceFile.statements.filter(isAmbientModule)) {
             if (!ambientModule.body) continue;
 
-            const ambientModuleImportDecls = ambientModule.body.statements.filter(isImportDeclaration);
-            organizeImportsWorker(ambientModuleImportDecls, coalesceAndOrganizeImports);
+            const ambientModuleGroupImportDecls = groupImportsByNewlines(ambientModule.body.statements.filter(isImportDeclaration), host, formatContext);
+            ambientModuleGroupImportDecls.forEach(ambientModuleGroupImportDecl => organizeImportsWorker(ambientModuleGroupImportDecl, coalesceAndOrganizeImports));
 
             const ambientModuleExportDecls = ambientModule.body.statements.filter(isExportDeclaration);
             organizeImportsWorker(ambientModuleExportDecls, coalesceExports);
@@ -88,6 +87,24 @@ namespace ts.OrganizeImports {
         }
     }
 
+    function groupImportsByNewlines(importDecls: ImportDeclaration[], host: LanguageServiceHost, formatContext: formatting.FormatContext): ImportDeclaration[][] {
+        const groupImports: ImportDeclaration[][] = [];
+        const newLine = getNewLineOrDefaultFromHost(host, formatContext.options);
+        const prefixCond = `${newLine}${newLine}`;
+        for(let index = 0, groupIndex = 0, length = importDecls.length; index < length ; ++index) {
+            const topLevelImportDecl = importDecls[index];
+            const leadingText = topLevelImportDecl.getFullText().substring(0, topLevelImportDecl.getStart() - topLevelImportDecl.getFullStart());
+            if (startsWith(leadingText, prefixCond)) {
+                groupIndex++;
+            }
+            if (!groupImports[groupIndex]) {
+                groupImports[groupIndex] = [];
+            }
+            groupImports[groupIndex].push(topLevelImportDecl);
+        }
+        return groupImports;
+    }
+
     function removeUnusedImports(oldImports: readonly ImportDeclaration[], sourceFile: SourceFile, program: Program, skipDestructiveCodeActions: boolean | undefined) {
         // As a precaution, consider unused import detection to be destructive (GH #43051)
         if (skipDestructiveCodeActions) {

tests/cases/fourslash/organizeImports10.ts

@@ -0,0 +1,19 @@
+/// <reference path="fourslash.ts" />
+
+////import c from "C";
+////
+////import d from "D";
+////import a from "A";
+////import b from "B";
+////
+////console.log(a, b, c, d)
+
+verify.organizeImports(
+`import c from "C";
+
+import a from "A";
+import b from "B";
+import d from "D";
+
+console.log(a, b, c, d)`
+);