Replace std::filesystem::path by std::string and std::string_view in nif code

It's used only for error reporting.

apps/niftest/niftest.cpp

@@ -65,10 +65,10 @@ void readNIF(
             std::cout << " from '" << Files::pathToUnicodeString(isBSA(source) ? source.filename() : source) << "'";
         std::cout << std::endl;
     }
-    std::filesystem::path fullPath = !source.empty() ? source / path : path;
+    const std::filesystem::path fullPath = !source.empty() ? source / path : path;
     try
     {
-        Nif::NIFFile file(fullPath);
+        Nif::NIFFile file(Files::pathToUnicodeString(fullPath));
         Nif::Reader reader(file, nullptr);
         if (vfs != nullptr)
             reader.parse(vfs->get(pathStr));

components/nif/exception.hpp

@@ -1,18 +1,21 @@
 #ifndef OPENMW_COMPONENTS_NIF_EXCEPTION_HPP
 #define OPENMW_COMPONENTS_NIF_EXCEPTION_HPP
 
-#include <filesystem>
 #include <stdexcept>
 #include <string>
 
-#include <components/files/conversion.hpp>
-
 namespace Nif
 {
     struct Exception : std::runtime_error
     {
-        explicit Exception(const std::string& message, const std::filesystem::path& path)
-            : std::runtime_error("NIFFile Error: " + message + " when reading " + Files::pathToUnicodeString(path))
+        explicit Exception(std::string_view message, std::string_view path)
+            : std::runtime_error([&] {
+                std::string result = "NIFFile Error: ";
+                result += message;
+                result += " when reading ";
+                result += path;
+                return result;
+            }())
         {
         }
     };

components/nif/niffile.hpp

@@ -4,7 +4,7 @@
 #define OPENMW_COMPONENTS_NIF_NIFFILE_HPP
 
 #include <atomic>
-#include <filesystem>
+#include <cstdint>
 #include <vector>
 
 #include <components/files/istreamptr.hpp>
@@ -45,7 +45,7 @@ namespace Nif
         std::uint32_t mBethVersion = 0;
 
         /// File name, used for error messages and opening the file
-        std::filesystem::path mPath;
+        std::string mPath;
         std::string mHash;
 
         /// Record list
@@ -56,7 +56,7 @@ namespace Nif
 
         bool mUseSkinning = false;
 
-        explicit NIFFile(const std::filesystem::path& path)
+        explicit NIFFile(std::string_view path)
             : mPath(path)
         {
         }
@@ -77,7 +77,7 @@ namespace Nif
         std::size_t numRoots() const { return mFile->mRoots.size(); }
 
         /// Get the name of the file
-        const std::filesystem::path& getFilename() const { return mFile->mPath; }
+        const std::string& getFilename() const { return mFile->mPath; }
 
         const std::string& getHash() const { return mFile->mHash; }
 
@@ -104,7 +104,7 @@ namespace Nif
         std::uint32_t& mBethVersion;
 
         /// File name, used for error messages and opening the file
-        std::filesystem::path& mFilename;
+        std::string_view mFilename;
         std::string& mHash;
 
         /// Record list
@@ -144,7 +144,7 @@ namespace Nif
         void setUseSkinning(bool skinning);
 
         /// Get the name of the file
-        std::filesystem::path getFilename() const { return mFilename; }
+        std::string_view getFilename() const { return mFilename; }
 
         /// Get the version of the NIF format used
         std::uint32_t getVersion() const { return mVersion; }

components/nifbullet/bulletnifloader.cpp

@@ -50,7 +50,7 @@ namespace NifBullet
             if (node)
                 roots.emplace_back(node);
         }
-        mShape->mFileName = Files::pathToUnicodeString(nif.getFilename());
+        mShape->mFileName = nif.getFilename();
         if (roots.empty())
         {
             warn("Found no root nodes in NIF file " + mShape->mFileName);