[fix] Extractor falls out of scope

Extractor was created and destroyed within the if scope, leading to
a dereference error when trying to call the virtual writer methods.

.gitignore

@@ -1,5 +1,6 @@
 .clangd/
 build/
+target/
 compile_commands.json
 
 # Created by https://www.gitignore.io/api/vim,c++,emacs,ninja

src/archive.cpp

@@ -106,17 +106,17 @@ ArchiveSpec Archive::check() {
 void Archive::extract(ExtractSpec extract_spec) {
   std::filesystem::path abs_path = std::filesystem::absolute(this->path);
 
+  std::unique_ptr<ArchiveExtractorSys> extractor;
+
   if(extract_spec.make_dir) {
-    ArchiveExtractorSys extractor{ArchiveExtractorSys{extract_spec.dirname}};
     logger::trace("Creating extract directory {}", extract_spec.dirname.string());
-    ArchiveReaderSys reader{abs_path};
+    extractor = std::unique_ptr<ArchiveExtractorSys>(new ArchiveExtractorSys{extract_spec.dirname});
-    extractor.extract_all(reader);
   } else {
-    ArchiveExtractorSys extractor{};
+    extractor = std::unique_ptr<ArchiveExtractorSys>(new ArchiveExtractorSys{});
-    logger::trace("Creating extract directory {}", extract_spec.dirname.string());
-    ArchiveReaderSys reader{abs_path};
-    extractor.extract_all(reader);
   }
+
+  ArchiveReaderSys reader{abs_path};
+  extractor->extract_all(reader);
 }
 
 }  // namespace xwim

src/archive_sys.cpp

@@ -79,6 +79,8 @@ xwim::ArchiveExtractorSys::ArchiveExtractorSys(std::filesystem::path& root) {
 
   this->writer = archive_write_disk_new();
   archive_write_disk_set_standard_lookup(this->writer);
+
+  logger::trace("Constructed ArchiveExtractorSys at {:p}", (void*) this->writer);
 }
 
 xwim::ArchiveExtractorSys::ArchiveExtractorSys() {
@@ -86,6 +88,7 @@ xwim::ArchiveExtractorSys::ArchiveExtractorSys() {
 
   this->writer = archive_write_disk_new();
   archive_write_disk_set_standard_lookup(this->writer);
+  logger::trace("Constructed ArchiveExtractorSys at {:p}", (void*) this->writer);
 }
 
 void xwim::ArchiveExtractorSys::extract_all(xwim::ArchiveReaderSys& reader) {
@@ -111,7 +114,7 @@ void xwim::ArchiveExtractorSys::extract_entry(xwim::ArchiveReaderSys& reader) {
 }
 
 xwim::ArchiveExtractorSys::~ArchiveExtractorSys(){
-  logger::trace("Destructing ArchiveExtractorSys");
+  logger::trace("Destructing ArchiveExtractorSys at {:p}", (void*) this->writer);
   if(this->writer) {
     archive_write_close(this->writer);
     archive_write_free(this->writer);