From 9e19c24d2911ff1ef648aeed0c596e3987eafebf Mon Sep 17 00:00:00 2001
From: Alexander Karatarakis <alkarata@microsoft.com>
Date: Thu, 12 Oct 2017 14:03:01 -0700
Subject: [PATCH] `vcpkg autocomplete` More work on autocomplete

---
 toolsrc/src/commands_autocomplete.cpp | 91 +++++++++++++++++++--------
 1 file changed, 65 insertions(+), 26 deletions(-)

diff --git a/toolsrc/src/commands_autocomplete.cpp b/toolsrc/src/commands_autocomplete.cpp
index 3963f904b4..abad19df7d 100644
--- a/toolsrc/src/commands_autocomplete.cpp
+++ b/toolsrc/src/commands_autocomplete.cpp
@@ -1,9 +1,8 @@
 #include "pch.h"
 
 #include "Paragraphs.h"
-#include "SortedVector.h"
+#include "metrics.h"
 #include "vcpkg_Commands.h"
-#include "vcpkg_Maps.h"
 #include "vcpkg_System.h"
 #include "vcpkglib.h"
 
@@ -35,7 +34,7 @@ namespace vcpkg::Commands::Autocomplete
 
         for (const auto& installed_package : installed_packages)
         {
-            auto sp = installed_package->package.displayname();
+            const auto sp = installed_package->package.displayname();
 
             if (istartswith(sp, start_with))
             {
@@ -47,33 +46,73 @@ 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"));
+        Metrics::g_metrics.lock()->set_send_metrics(false);
 
-        args.check_min_arg_count(1, EXAMPLE);
-        args.check_max_arg_count(2, EXAMPLE);
-        args.check_and_get_optional_command_arguments({});
-
-        const std::string requested_command = args.command_arguments.at(0);
-        const std::string start_with =
-            args.command_arguments.size() > 1 ? args.command_arguments.at(1) : Strings::EMPTY;
-        std::vector<std::string> results;
-        if (requested_command == "install")
+        if (args.command_arguments.size() != 1)
         {
-            auto sources_and_errors = Paragraphs::try_load_all_ports(paths.get_filesystem(), paths.ports);
-            auto& source_paragraphs = sources_and_errors.paragraphs;
-
-            results = autocomplete_install(source_paragraphs, start_with);
-        }
-        else if (requested_command == "remove")
-        {
-            const StatusParagraphs status_db = database_load_check(paths);
-            std::vector<StatusParagraph*> installed_packages = get_installed_ports(status_db);
-            results = autocomplete_remove(installed_packages, start_with);
+            Checks::exit_success(VCPKG_LINE_INFO);
+        }
+
+        const std::string to_autocomplete = args.command_arguments.at(0);
+        const std::vector<std::string> tokens = Strings::split(to_autocomplete, " ");
+        if (tokens.size() == 1)
+        {
+            const std::string requested_command = tokens[0];
+
+            std::vector<std::string> valid_commands = {"install",
+                                                       "search",
+                                                       "remove",
+                                                       "list",
+                                                       "update",
+                                                       "hash",
+                                                       "help",
+                                                       "integrate",
+                                                       "export",
+                                                       "edit",
+                                                       "create",
+                                                       "owns",
+                                                       "cache",
+                                                       "version",
+                                                       "contact"};
+
+            Util::unstable_keep_if(valid_commands, [&](const std::string& s) {
+                return Strings::case_insensitive_ascii_starts_with(s, requested_command);
+            });
+
+            if (valid_commands.size() == 1)
+            {
+                System::println(valid_commands[0] + " ");
+            }
+            else
+            {
+                System::println(Strings::join("\n", valid_commands));
+            }
+
+            Checks::exit_success(VCPKG_LINE_INFO);
+        }
+
+        if (tokens.size() == 2)
+        {
+            const std::string requested_command = tokens[0];
+            const std::string start_with = tokens[1];
+            std::vector<std::string> results;
+            if (requested_command == "install")
+            {
+                auto sources_and_errors = Paragraphs::try_load_all_ports(paths.get_filesystem(), paths.ports);
+                auto& source_paragraphs = sources_and_errors.paragraphs;
+
+                results = autocomplete_install(source_paragraphs, start_with);
+            }
+            else if (requested_command == "remove")
+            {
+                const StatusParagraphs status_db = database_load_check(paths);
+                const std::vector<StatusParagraph*> installed_packages = get_installed_ports(status_db);
+                results = autocomplete_remove(installed_packages, start_with);
+            }
+
+            System::println(Strings::join("\n", results));
         }
 
-        System::println(Strings::join(" ", results));
         Checks::exit_success(VCPKG_LINE_INFO);
     }
 }