From 802f51a142283a117bf5bfa3f456493d8a20017d Mon Sep 17 00:00:00 2001
From: Robert Schumacher <roschuma@microsoft.com>
Date: Mon, 9 Jul 2018 06:29:37 -0700
Subject: [vcpkg] Split vcpkg::Commands::Fetch into backend and frontend

---
 toolsrc/include/vcpkg/commands.h   |  2 --
 toolsrc/include/vcpkg/tools.h      | 21 +++++++++++++++++++++
 toolsrc/include/vcpkg/vcpkgpaths.h |  5 ++++-
 3 files changed, 25 insertions(+), 3 deletions(-)
 create mode 100644 toolsrc/include/vcpkg/tools.h

(limited to 'toolsrc/include')

diff --git a/toolsrc/include/vcpkg/commands.h b/toolsrc/include/vcpkg/commands.h
index c6310c340..78b4dda50 100644
--- a/toolsrc/include/vcpkg/commands.h
+++ b/toolsrc/include/vcpkg/commands.h
@@ -139,8 +139,6 @@ namespace vcpkg::Commands
 
     namespace Fetch
     {
-        fs::path get_tool_path(const VcpkgPaths& paths, const std::string& tool);
-        std::string get_tool_version(const VcpkgPaths& paths, const std::string& tool);
         void perform_and_exit(const VcpkgCmdArguments& args, const VcpkgPaths& paths);
     }
 
diff --git a/toolsrc/include/vcpkg/tools.h b/toolsrc/include/vcpkg/tools.h
new file mode 100644
index 000000000..6a096c321
--- /dev/null
+++ b/toolsrc/include/vcpkg/tools.h
@@ -0,0 +1,21 @@
+#pragma once
+
+#include <vcpkg/base/files.h>
+
+#include <string>
+#include <utility>
+
+namespace vcpkg
+{
+    struct VcpkgPaths;
+
+    struct ToolCache
+    {
+        virtual ~ToolCache() {}
+
+        virtual const fs::path& get_tool_path(const VcpkgPaths& paths, const std::string& tool) const = 0;
+        virtual const std::string& get_tool_version(const VcpkgPaths& paths, const std::string& tool) const = 0;
+    };
+
+    std::unique_ptr<ToolCache> get_tool_cache();
+}
diff --git a/toolsrc/include/vcpkg/vcpkgpaths.h b/toolsrc/include/vcpkg/vcpkgpaths.h
index a3c90fd33..42de40d9c 100644
--- a/toolsrc/include/vcpkg/vcpkgpaths.h
+++ b/toolsrc/include/vcpkg/vcpkgpaths.h
@@ -2,6 +2,7 @@
 
 #include <vcpkg/binaryparagraph.h>
 #include <vcpkg/packagespec.h>
+#include <vcpkg/tools.h>
 
 #include <vcpkg/base/cache.h>
 #include <vcpkg/base/expected.h>
@@ -78,6 +79,7 @@ namespace vcpkg
         fs::path ports_cmake;
 
         const fs::path& get_tool_exe(const std::string& tool) const;
+        const std::string& get_tool_version(const std::string& tool) const;
 
         /// <summary>Retrieve a toolset matching a VS version</summary>
         /// <remarks>
@@ -89,10 +91,11 @@ namespace vcpkg
 
     private:
         Lazy<std::vector<std::string>> available_triplets;
-        Cache<std::string, fs::path> tool_paths;
         Lazy<std::vector<Toolset>> toolsets;
         Lazy<std::vector<Toolset>> toolsets_vs2013;
 
         fs::path default_vs_path;
+
+        mutable std::unique_ptr<ToolCache> m_tool_cache;
     };
 }
-- 
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