cps: move platform abstractions out of search.cpp

These will be useful outside of the cps search module.

src/CMakeLists.txt

@@ -3,6 +3,7 @@ add_library(
     cps
     cps/env.cpp
     cps/loader.cpp
+    cps/platform.cpp
     cps/printer.cpp
     cps/search.cpp
     cps/utils.cpp

src/cps/platform.cpp

@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: MIT
+// Copyright © 2024 Dylan Baker
+
+#include "cps/platform.hpp"
+
+namespace cps::platform {
+
+    fs::path libdir() { return "lib"; }
+
+    fs::path datadir() { return "share"; }
+
+} // namespace cps::platform

src/cps/platform.hpp

@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: MIT
+// Copyright © 2024 Dylan Baker
+
+#include <filesystem>
+
+namespace cps::platform {
+
+    namespace fs = std::filesystem;
+
+    /// @brief  Get the platform specific location that libraries are installed in
+    /// @return A path segment for libraries to be installed in, relative to a prefix
+    fs::path libdir();
+
+    /// @brief  Get the platform specific location to install architecture agnostic data to
+    /// @return A path segment for data to be installed in, relative to a prefix
+    fs::path datadir();
+
+} // namespace cps::platform

src/cps/search.cpp

@@ -6,6 +6,7 @@
 
 #include "cps/error.hpp"
 #include "cps/loader.hpp"
+#include "cps/platform.hpp"
 #include "cps/utils.hpp"
 #include "cps/version.hpp"
 
@@ -71,19 +72,6 @@ namespace cps::search {
             return out;
         }
 
-        fs::path libdir() {
-            // TODO: libdir needs to be configurable based on the personality,
-            //       and different name schemes.
-            //       This is complicated by the fact that different distros have
-            //       different schemes.
-            return "lib";
-        }
-
-        fs::path datadir() {
-            // TODO: needs to be configurable. see libdir above.
-            return "share";
-        }
-
         const std::vector<fs::path> nix_prefix{"/usr", "/usr/local"};
         // TODO: const std::vector<std::string> mac_prefix{""};
         // TODO: const std::vector<std::string> win_prefix{""};
@@ -100,8 +88,8 @@ namespace cps::search {
             // TODO: Windows specific paths
 
             // TODO: handle name-like search paths
-            paths.emplace_back(prefix / libdir() / "cps");
-            paths.emplace_back(prefix / datadir() / "cps");
+            paths.emplace_back(prefix / platform::libdir() / "cps");
+            paths.emplace_back(prefix / platform::datadir() / "cps");
 
             return paths;
         };

src/meson.build

@@ -9,6 +9,7 @@ libcps = static_library(
   'cps',
   'cps/env.cpp',
   'cps/loader.cpp',
+  'cps/platform.cpp',
   'cps/printer.cpp',
   'cps/search.cpp',
   'cps/utils.cpp',