file(GENERATE): Support new line style

Fixes: #19198

5 files changed, 55 insertions, 12 deletions

diff --git a/Source/cmFileCommand.cxx b/Source/cmFileCommand.cxx
index 576f015..ab83548 100644
--- a/Source/cmFileCommand.cxx
+++ b/Source/cmFileCommand.cxx
@@ -2290,7 +2290,8 @@ void AddEvaluationFile(const std::string& inputName,
                        const std::string& targetName,
                        const std::string& outputExpr,
                        const std::string& condition, bool inputIsContent,
-                       mode_t permissions, cmExecutionStatus& status)
+                       const std::string& newLineCharacter, mode_t permissions,
+                       cmExecutionStatus& status)
 {
   cmListFileBacktrace lfbt = status.GetMakefile().GetBacktrace();
 
@@ -2304,7 +2305,7 @@ void AddEvaluationFile(const std::string& inputName,
 
   status.GetMakefile().AddEvaluationFile(
     inputName, targetName, std::move(outputCge), std::move(conditionCge),
-    permissions, inputIsContent);
+    newLineCharacter, permissions, inputIsContent);
 }
 
 bool HandleGenerateCommand(std::vector<std::string> const& args,
@@ -2322,6 +2323,7 @@ bool HandleGenerateCommand(std::vector<std::string> const& args,
     std::string Content;
     std::string Condition;
     std::string Target;
+    std::string NewLineStyle;
     bool NoSourcePermissions = false;
     bool UseSourcePermissions = false;
     std::vector<std::string> FilePermissions;
@@ -2336,7 +2338,8 @@ bool HandleGenerateCommand(std::vector<std::string> const& args,
       .Bind("TARGET"_s, &Arguments::Target)
       .Bind("NO_SOURCE_PERMISSIONS"_s, &Arguments::NoSourcePermissions)
       .Bind("USE_SOURCE_PERMISSIONS"_s, &Arguments::UseSourcePermissions)
-      .Bind("FILE_PERMISSIONS"_s, &Arguments::FilePermissions);
+      .Bind("FILE_PERMISSIONS"_s, &Arguments::FilePermissions)
+      .Bind("NEWLINE_STYLE"_s, &Arguments::NewLineStyle);
 
   std::vector<std::string> unparsedArguments;
   std::vector<std::string> keywordsMissingValues;
@@ -2400,6 +2403,18 @@ bool HandleGenerateCommand(std::vector<std::string> const& args,
     status.SetError("Unknown argument to GENERATE subcommand.");
   }
 
+  const bool newLineStyleSpecified =
+    std::find(parsedKeywords.begin(), parsedKeywords.end(),
+              "NEWLINE_STYLE"_s) != parsedKeywords.end();
+  cmNewLineStyle newLineStyle;
+  if (newLineStyleSpecified) {
+    std::string errorMessage;
+    if (!newLineStyle.ReadFromArguments(args, errorMessage)) {
+      status.SetError(cmStrCat("GENERATE ", errorMessage));
+      return false;
+    }
+  }
+
   std::string input = arguments.Input;
   if (inputIsContent) {
     input = arguments.Content;
@@ -2463,7 +2478,8 @@ bool HandleGenerateCommand(std::vector<std::string> const& args,
   }
 
   AddEvaluationFile(input, arguments.Target, arguments.Output,
-                    arguments.Condition, inputIsContent, permisiions, status);
+                    arguments.Condition, inputIsContent,
+                    newLineStyle.GetCharacters(), permisiions, status);
   return true;
 }
 
diff --git a/Source/cmGeneratorExpressionEvaluationFile.cxx b/Source/cmGeneratorExpressionEvaluationFile.cxx
index ec44df3..9fae15a 100644
--- a/Source/cmGeneratorExpressionEvaluationFile.cxx
+++ b/Source/cmGeneratorExpressionEvaluationFile.cxx
@@ -21,13 +21,14 @@ cmGeneratorExpressionEvaluationFile::cmGeneratorExpressionEvaluationFile(
   std::string input, std::string target,
   std::unique_ptr<cmCompiledGeneratorExpression> outputFileExpr,
   std::unique_ptr<cmCompiledGeneratorExpression> condition,
-  bool inputIsContent, mode_t permissions,
+  bool inputIsContent, std::string newLineCharacter, mode_t permissions,
   cmPolicies::PolicyStatus policyStatusCMP0070)
   : Input(std::move(input))
   , Target(std::move(target))
   , OutputFileExpr(std::move(outputFileExpr))
   , Condition(std::move(condition))
   , InputIsContent(inputIsContent)
+  , NewLineCharacter(std::move(newLineCharacter))
   , PolicyStatusCMP0070(policyStatusCMP0070)
   , Permissions(permissions)
 {
@@ -82,9 +83,33 @@ void cmGeneratorExpressionEvaluationFile::Generate(
   this->Files.push_back(outputFileName);
   outputFiles[outputFileName] = outputContent;
 
-  cmGeneratedFileStream fout(outputFileName);
+  bool openWithBinaryFlag = false;
+  if (!this->NewLineCharacter.empty()) {
+    openWithBinaryFlag = true;
+  }
+  cmGeneratedFileStream fout;
+  fout.Open(outputFileName, false, openWithBinaryFlag);
+  if (!fout) {
+    lg->IssueMessage(MessageType::FATAL_ERROR,
+                     "Could not open file for write in copy operation " +
+                       outputFileName);
+    return;
+  }
   fout.SetCopyIfDifferent(true);
-  fout << outputContent;
+  std::istringstream iss(outputContent);
+  std::string line;
+  bool hasNewLine = false;
+  while (cmSystemTools::GetLineFromStream(iss, line, &hasNewLine)) {
+    fout << line;
+    if (!this->NewLineCharacter.empty()) {
+      fout << this->NewLineCharacter;
+    } else if (hasNewLine) {
+      // if new line character is not specified, the file will be opened in
+      // text mode. So, "\n" will be translated to the correct newline
+      // ending based on the platform.
+      fout << "\n";
+    }
+  }
   if (fout.Close() && perm) {
     cmSystemTools::SetPermissions(outputFileName.c_str(), perm);
   }
diff --git a/Source/cmGeneratorExpressionEvaluationFile.h b/Source/cmGeneratorExpressionEvaluationFile.h
index 9a870ac..0eb78ac 100644
--- a/Source/cmGeneratorExpressionEvaluationFile.h
+++ b/Source/cmGeneratorExpressionEvaluationFile.h
@@ -24,7 +24,7 @@ public:
     std::string input, std::string target,
     std::unique_ptr<cmCompiledGeneratorExpression> outputFileExpr,
     std::unique_ptr<cmCompiledGeneratorExpression> condition,
-    bool inputIsContent, mode_t permissions,
+    bool inputIsContent, std::string newLineCharacter, mode_t permissions,
     cmPolicies::PolicyStatus policyStatusCMP0070);
 
   void Generate(cmLocalGenerator* lg);
@@ -58,6 +58,7 @@ private:
   const std::unique_ptr<cmCompiledGeneratorExpression> Condition;
   std::vector<std::string> Files;
   const bool InputIsContent;
+  const std::string NewLineCharacter;
   cmPolicies::PolicyStatus PolicyStatusCMP0070;
   mode_t Permissions;
 };
diff --git a/Source/cmMakefile.cxx b/Source/cmMakefile.cxx
index 0fc8fa3..d6e60d0 100644
--- a/Source/cmMakefile.cxx
+++ b/Source/cmMakefile.cxx
@@ -865,13 +865,13 @@ void cmMakefile::EnforceDirectoryLevelRules() const
 void cmMakefile::AddEvaluationFile(
   const std::string& inputFile, const std::string& targetName,
   std::unique_ptr<cmCompiledGeneratorExpression> outputName,
-  std::unique_ptr<cmCompiledGeneratorExpression> condition, mode_t permissions,
-  bool inputIsContent)
+  std::unique_ptr<cmCompiledGeneratorExpression> condition,
+  const std::string& newLineCharacter, mode_t permissions, bool inputIsContent)
 {
   this->EvaluationFiles.push_back(
     cm::make_unique<cmGeneratorExpressionEvaluationFile>(
       inputFile, targetName, std::move(outputName), std::move(condition),
-      inputIsContent, permissions,
+      inputIsContent, newLineCharacter, permissions,
       this->GetPolicyStatus(cmPolicies::CMP0070)));
 }
 
diff --git a/Source/cmMakefile.h b/Source/cmMakefile.h
index 60b66a2..6341abc 100644
--- a/Source/cmMakefile.h
+++ b/Source/cmMakefile.h
@@ -899,7 +899,8 @@ public:
     const std::string& inputFile, const std::string& targetName,
     std::unique_ptr<cmCompiledGeneratorExpression> outputName,
     std::unique_ptr<cmCompiledGeneratorExpression> condition,
-    mode_t permissions, bool inputIsContent);
+    const std::string& newLineCharacter, mode_t permissions,
+    bool inputIsContent);
   const std::vector<std::unique_ptr<cmGeneratorExpressionEvaluationFile>>&
   GetEvaluationFiles() const;