Use std::filesystem::path instead of Path in libexpr.

src/libexpr/eval-settings.cc

@@ -103,9 +103,9 @@ const std::string & EvalSettings::getCurrentSystem() const
     return evalSystem != "" ? evalSystem : settings.thisSystem.get();
 }
 
-Path getNixDefExpr()
+std::filesystem::path getNixDefExpr()
 {
-    return settings.useXDGBaseDirectories ? getStateDir() + "/defexpr" : getHome() + "/.nix-defexpr";
+    return settings.useXDGBaseDirectories ? getStateDir() / "defexpr" : getHome() / ".nix-defexpr";
 }
 
 } // namespace nix

src/libexpr/include/nix/expr/eval-settings.hh

@@ -366,6 +366,6 @@ struct EvalSettings : Config
 /**
  * Conventionally part of the default nix path in impure mode.
  */
-Path getNixDefExpr();
+std::filesystem::path getNixDefExpr();
 
 } // namespace nix

src/libexpr/parser.y

@@ -389,7 +389,7 @@ path_start
             std::string_view($1.p, $1.l)
         );
     }
-    Path path(getHome() + std::string($1.p + 1, $1.l - 1));
+    Path path(getHome().string() + std::string($1.p + 1, $1.l - 1));
     $$ = state->exprs.add<ExprPath>(state->exprs.alloc, ref<SourceAccessor>(state->rootFS), path);
   }
   ;

src/libutil/include/nix/util/users.hh

@@ -1,6 +1,8 @@
 #pragma once
 ///@file
 
+#include <filesystem>
+
 #include "nix/util/types.hh"
 
 #ifndef _WIN32
@@ -15,43 +17,43 @@ std::string getUserName();
 /**
  * @return the given user's home directory from /etc/passwd.
  */
-Path getHomeOf(uid_t userId);
+std::filesystem::path getHomeOf(uid_t userId);
 #endif
 
 /**
  * @return $HOME or the user's home directory from /etc/passwd.
  */
-Path getHome();
+std::filesystem::path getHome();
 
 /**
  * @return $NIX_CACHE_HOME or $XDG_CACHE_HOME/nix or $HOME/.cache/nix.
  */
-Path getCacheDir();
+std::filesystem::path getCacheDir();
 
 /**
  * @return $NIX_CONFIG_HOME or $XDG_CONFIG_HOME/nix or $HOME/.config/nix.
  */
-Path getConfigDir();
+std::filesystem::path getConfigDir();
 
 /**
  * @return the directories to search for user configuration files
  */
-std::vector<Path> getConfigDirs();
+std::vector<std::filesystem::path> getConfigDirs();
 
 /**
  * @return $NIX_DATA_HOME or $XDG_DATA_HOME/nix or $HOME/.local/share/nix.
  */
-Path getDataDir();
+std::filesystem::path getDataDir();
 
 /**
  * @return $NIX_STATE_HOME or $XDG_STATE_HOME/nix or $HOME/.local/state/nix.
  */
-Path getStateDir();
+std::filesystem::path getStateDir();
 
 /**
  * Create the Nix state directory and return the path to it.
  */
-Path createNixStateDir();
+std::filesystem::path createNixStateDir();
 
 /**
  * Perform tilde expansion on a path, replacing tilde with the user's

src/libutil/include/nix/util/util.hh

@@ -6,6 +6,7 @@
 #include "nix/util/logging.hh"
 #include "nix/util/strings.hh"
 
+#include <filesystem>
 #include <functional>
 #include <map>
 #include <sstream>

src/libutil/unix/users.cc

@@ -18,7 +18,7 @@ std::string getUserName()
     return name;
 }
 
-Path getHomeOf(uid_t userId)
+std::filesystem::path getHomeOf(uid_t userId)
 {
     std::vector<char> buf(16384);
     struct passwd pwbuf;
@@ -28,9 +28,9 @@ Path getHomeOf(uid_t userId)
     return pw->pw_dir;
 }
 
-Path getHome()
+std::filesystem::path getHome()
 {
-    static Path homeDir = []() {
+    static std::filesystem::path homeDir = []() {
         std::optional<std::string> unownedUserHomeDir = {};
         auto homeDir = getEnv("HOME");
         if (homeDir) {

src/libutil/users.cc

@@ -5,81 +5,82 @@
 
 namespace nix {
 
-Path getCacheDir()
+std::filesystem::path getCacheDir()
 {
     auto dir = getEnv("NIX_CACHE_HOME");
     if (dir) {
         return *dir;
     } else {
         auto xdgDir = getEnv("XDG_CACHE_HOME");
         if (xdgDir) {
-            return *xdgDir + "/nix";
+            return std::filesystem::path{*xdgDir} / "nix";
         } else {
-            return getHome() + "/.cache/nix";
+            return getHome() / ".cache" / "nix";
         }
     }
 }
 
-Path getConfigDir()
+std::filesystem::path getConfigDir()
 {
     auto dir = getEnv("NIX_CONFIG_HOME");
     if (dir) {
         return *dir;
     } else {
         auto xdgDir = getEnv("XDG_CONFIG_HOME");
         if (xdgDir) {
-            return *xdgDir + "/nix";
+            return std::filesystem::path{*xdgDir} / "nix";
         } else {
-            return getHome() + "/.config/nix";
+            return getHome() / ".config" / "nix";
         }
     }
 }
 
-std::vector<Path> getConfigDirs()
+std::vector<std::filesystem::path> getConfigDirs()
 {
-    Path configHome = getConfigDir();
+    std::filesystem::path configHome = getConfigDir();
     auto configDirs = getEnv("XDG_CONFIG_DIRS").value_or("/etc/xdg");
-    std::vector<Path> result = tokenizeString<std::vector<std::string>>(configDirs, ":");
-    for (auto & p : result) {
-        p += "/nix";
+    auto tokens = tokenizeString<std::vector<std::string>>(configDirs, ":");
+    std::vector<std::filesystem::path> result;
+    result.push_back(configHome);
+    for (auto & token : tokens) {
+        result.push_back(std::filesystem::path{token} / "nix");
     }
-    result.insert(result.begin(), configHome);
     return result;
 }
 
-Path getDataDir()
+std::filesystem::path getDataDir()
 {
     auto dir = getEnv("NIX_DATA_HOME");
     if (dir) {
         return *dir;
     } else {
         auto xdgDir = getEnv("XDG_DATA_HOME");
         if (xdgDir) {
-            return *xdgDir + "/nix";
+            return std::filesystem::path{*xdgDir} / "nix";
         } else {
-            return getHome() + "/.local/share/nix";
+            return getHome() / ".local" / "share" / "nix";
         }
     }
 }
 
-Path getStateDir()
+std::filesystem::path getStateDir()
 {
     auto dir = getEnv("NIX_STATE_HOME");
     if (dir) {
         return *dir;
     } else {
         auto xdgDir = getEnv("XDG_STATE_HOME");
         if (xdgDir) {
-            return *xdgDir + "/nix";
+            return std::filesystem::path{*xdgDir} / "nix";
         } else {
-            return getHome() + "/.local/state/nix";
+            return getHome() / ".local" / "state" / "nix";
         }
     }
 }
 
-Path createNixStateDir()
+std::filesystem::path createNixStateDir()
 {
-    Path dir = getStateDir();
+    std::filesystem::path dir = getStateDir();
     createDirs(dir);
     return dir;
 }

src/libutil/windows/users.cc

@@ -35,10 +35,10 @@ std::string getUserName()
     return name;
 }
 
-Path getHome()
+std::filesystem::path getHome()
 {
-    static Path homeDir = []() {
-        Path homeDir = getEnv("USERPROFILE").value_or("C:\\Users\\Default");
+    static std::filesystem::path homeDir = []() {
+        std::filesystem::path homeDir = getEnv("USERPROFILE").value_or("C:\\Users\\Default");
         assert(!homeDir.empty());
         return canonPath(homeDir);
     }();