Utils: Add FilePath constructor for TempFileSaver

Change-Id: I15286be055bd69544e4283740bd0c3411573475c
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: hjk <hjk@qt.io>

src/libs/utils/fileutils.cpp

@@ -238,6 +238,11 @@ bool FileSaver::finalize()
 }
 
 TempFileSaver::TempFileSaver(const QString &templ)
+{
+    initFromString(templ);
+}
+
+void TempFileSaver::initFromString(const QString &templ)
 {
     m_file.reset(new QTemporaryFile{});
     auto tempFile = static_cast<QTemporaryFile *>(m_file.get());
@@ -253,6 +258,29 @@ TempFileSaver::TempFileSaver(const QString &templ)
     m_filePath = FilePath::fromString(tempFile->fileName());
 }
 
+TempFileSaver::TempFileSaver(const FilePath &templ)
+{
+    if (templ.isEmpty() || !templ.needsDevice()) {
+        initFromString(templ.path());
+    } else {
+        expected_str<FilePath> result = templ.createTempFile();
+        if (!result) {
+            m_errorString = Tr::tr("Cannot create temporary file %1: %2")
+                                .arg(templ.toUserOutput(), result.error());
+            m_hasError = true;
+            return;
+        }
+
+        m_file.reset(new QFile(result->toFSPathString()));
+        if (!m_file->open(QIODevice::WriteOnly)) {
+            m_errorString = Tr::tr("Cannot create temporary file %1: %2")
+                                .arg(result->toUserOutput(), m_file->errorString());
+            m_hasError = true;
+        }
+        m_filePath = *result;
+    }
+}
+
 TempFileSaver::~TempFileSaver()
 {
     m_file.reset();

src/libs/utils/fileutils.h

@@ -222,10 +222,14 @@ class QTCREATOR_UTILS_EXPORT TempFileSaver : public FileSaverBase
 {
 public:
     explicit TempFileSaver(const QString &templ = QString());
+    explicit TempFileSaver(const FilePath &templ);
     ~TempFileSaver() override;
 
     void setAutoRemove(bool on) { m_autoRemove = on; }
 
+protected:
+    void initFromString(const QString &templ);
+
 private:
     bool m_autoRemove = true;
 };