Create stub autocomplete function

toolsrc/include/vcpkg_Commands.h

@@ -194,6 +194,11 @@ namespace vcpkg::Commands
         void perform_and_exit(const VcpkgCmdArguments& args, const VcpkgPaths& paths);
     }
 
+	namespace Autocomplete
+	{
+		void perform_and_exit(const VcpkgCmdArguments& args, const VcpkgPaths& paths);
+	}
+
     namespace Help
     {
         void perform_and_exit(const VcpkgCmdArguments& args, const VcpkgPaths& paths);

toolsrc/src/commands_autocomplete.cpp

@@ -0,0 +1,22 @@
+#include "pch.h"
+
+#include "Paragraphs.h"
+#include "SortedVector.h"
+#include "vcpkg_Commands.h"
+#include "vcpkg_Maps.h"
+#include "vcpkg_System.h"
+
+namespace vcpkg::Commands::Autocomplete
+{
+    void perform_and_exit(const VcpkgCmdArguments& args, const VcpkgPaths& paths)
+    {
+        static const std::string EXAMPLE =
+            Strings::format("The argument should be a command line to autocomplete.\n%s",
+                            Commands::Help::create_example_string("autocomplete install z"));
+
+        args.check_max_arg_count(1, EXAMPLE);
+        args.check_and_get_optional_command_arguments({});
+
+        Checks::exit_success(VCPKG_LINE_INFO);
+    }
+}

toolsrc/src/commands_available_commands.cpp

@@ -34,7 +34,7 @@ namespace vcpkg::Commands
             {"import", &Import::perform_and_exit},
             {"cache", &Cache::perform_and_exit},
             {"portsdiff", &PortsDiff::perform_and_exit},
-        };
+            {"autocomplete", &Autocomplete::perform_and_exit}};
         return t;
     }
 

toolsrc/vcpkglib/vcpkglib.vcxproj

@@ -181,6 +181,7 @@
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="..\src\BinaryParagraph.cpp" />
+    <ClCompile Include="..\src\commands_autocomplete.cpp" />
     <ClCompile Include="..\src\commands_ci.cpp" />
     <ClCompile Include="..\src\commands_depends.cpp" />
     <ClCompile Include="..\src\commands_env.cpp" />

toolsrc/vcpkglib/vcpkglib.vcxproj.filters

@@ -180,6 +180,9 @@
     <ClCompile Include="..\src\vcpkg_GlobalState.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="..\src\commands_autocomplete.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="..\include\SourceParagraph.h">