refactor: replace boost::filesystem with std::filesystem

Warning: Replacing fs::system_complete calls with fs::absolute calls
in this commit may cause minor changes in behaviour because fs::absolute
no longer strips trailing slashes; however these changes are believed to
be safe.

Co-authored-by: Russell Yanofsky <russ@yanofsky.org>
Co-authored-by: Hennadii Stepanov <32963518+hebasto@users.noreply.github.com>

src/qt/guiutil.cpp

@@ -12,6 +12,7 @@
 
 #include <base58.h>
 #include <chainparams.h>
+#include <fs.h>
 #include <interfaces/node.h>
 #include <key_io.h>
 #include <policy/policy.h>
@@ -66,6 +67,10 @@
 
 #include <cassert>
 #include <chrono>
+#include <exception>
+#include <fstream>
+#include <string>
+#include <vector>
 
 #if defined(Q_OS_MAC)
 
@@ -426,7 +431,7 @@ bool openBitcoinConf()
     fs::path pathConfig = GetConfigFile(gArgs.GetArg("-conf", BITCOIN_CONF_FILENAME));
 
     /* Create the file */
-    fsbridge::ofstream configFile(pathConfig, std::ios_base::app);
+    std::ofstream configFile{pathConfig, std::ios_base::app};
 
     if (!configFile.good())
         return false;
@@ -586,7 +591,7 @@ fs::path static GetAutostartFilePath()
 
 bool GetStartOnSystemStartup()
 {
-    fsbridge::ifstream optionFile(GetAutostartFilePath());
+    std::ifstream optionFile{GetAutostartFilePath()};
     if (!optionFile.good())
         return false;
     // Scan through file for "Hidden=true":
@@ -617,7 +622,7 @@ bool SetStartOnSystemStartup(bool fAutoStart)
 
         fs::create_directories(GetAutostartDir());
 
-        fsbridge::ofstream optionFile(GetAutostartFilePath(), std::ios_base::out | std::ios_base::trunc);
+        std::ofstream optionFile{GetAutostartFilePath(), std::ios_base::out | std::ios_base::trunc};
         if (!optionFile.good())
             return false;
         std::string chain = gArgs.GetChainName();

src/qt/psbtoperationsdialog.cpp

@@ -5,6 +5,7 @@
 #include <qt/psbtoperationsdialog.h>
 
 #include <core_io.h>
+#include <fs.h>
 #include <interfaces/node.h>
 #include <key_io.h>
 #include <node/psbt.h>
@@ -15,7 +16,9 @@
 #include <qt/optionsmodel.h>
 #include <util/strencodings.h>
 
+#include <fstream>
 #include <iostream>
+#include <string>
 
 using node::AnalyzePSBT;
 using node::DEFAULT_MAX_RAW_TX_FEE_RATE;
@@ -158,7 +161,7 @@ void PSBTOperationsDialog::saveTransaction() {
     if (filename.isEmpty()) {
         return;
     }
-    fsbridge::ofstream out{filename.toLocal8Bit().data(), fsbridge::ofstream::out | fsbridge::ofstream::binary};
+    std::ofstream out{filename.toLocal8Bit().data(), std::ofstream::out | std::ofstream::binary};
     out << ssTx.str();
     out.close();
     showStatus(tr("PSBT saved to disk."), StatusLevel::INFO);

src/qt/sendcoinsdialog.cpp

@@ -29,7 +29,10 @@
 #include <wallet/fees.h>
 #include <wallet/wallet.h>
 
+#include <array>
 #include <chrono>
+#include <fstream>
+#include <memory>
 
 #include <QFontMetrics>
 #include <QScrollBar>
@@ -509,7 +512,7 @@ void SendCoinsDialog::sendButtonClicked([[maybe_unused]] bool checked)
             if (filename.isEmpty()) {
                 return;
             }
-            fsbridge::ofstream out{filename.toLocal8Bit().data(), fsbridge::ofstream::out | fsbridge::ofstream::binary};
+            std::ofstream out{filename.toLocal8Bit().data(), std::ofstream::out | std::ofstream::binary};
             out << ssTx.str();
             out.close();
             Q_EMIT message(tr("PSBT saved"), "PSBT saved to disk", CClientUIInterface::MSG_INFORMATION);

src/qt/walletframe.cpp

@@ -4,6 +4,7 @@
 
 #include <qt/walletframe.h>
 
+#include <fs.h>
 #include <node/ui_interface.h>
 #include <psbt.h>
 #include <qt/guiutil.h>
@@ -14,6 +15,8 @@
 #include <util/system.h>
 
 #include <cassert>
+#include <fstream>
+#include <string>
 
 #include <QApplication>
 #include <QClipboard>
@@ -210,7 +213,7 @@ void WalletFrame::gotoLoadPSBT(bool from_clipboard)
             Q_EMIT message(tr("Error"), tr("PSBT file must be smaller than 100 MiB"), CClientUIInterface::MSG_ERROR);
             return;
         }
-        fsbridge::ifstream in{filename.toLocal8Bit().data(), std::ios::binary};
+        std::ifstream in{filename.toLocal8Bit().data(), std::ios::binary};
         data = std::string(std::istreambuf_iterator<char>{in}, {});
     }