Add options and documentation for env command (#3007)

* [vcpkg] Add options and documentation for env command

* [vcpkg-env] Cleanup. Add tools/*.

3 files changed, 62 insertions, 13 deletions

diff --git a/toolsrc/src/vcpkg/base/system.cpp b/toolsrc/src/vcpkg/base/system.cpp
index e24098f97..f339afa51 100644
--- a/toolsrc/src/vcpkg/base/system.cpp
+++ b/toolsrc/src/vcpkg/base/system.cpp
@@ -153,12 +153,12 @@ namespace vcpkg::System
             R"(powershell -NoProfile -ExecutionPolicy Bypass -Command "& {& '%s' %s}")", script_path.u8string(), args);
     }
 
-    int cmd_execute_clean(const CStringView cmd_line)
+    int cmd_execute_clean(const CStringView cmd_line, const std::unordered_map<std::string, std::string>& extra_env)
     {
 #if defined(_WIN32)
         static const std::string SYSTEM_ROOT = get_environment_variable("SystemRoot").value_or_exit(VCPKG_LINE_INFO);
         static const std::string SYSTEM_32 = SYSTEM_ROOT + R"(\system32)";
-        static const std::string NEW_PATH = Strings::format(
+        std::string NEW_PATH = Strings::format(
             R"(Path=%s;%s;%s\Wbem;%s\WindowsPowerShell\v1.0\)", SYSTEM_32, SYSTEM_ROOT, SYSTEM_32, SYSTEM_32);
 
         std::vector<std::wstring> env_wstrings = {
@@ -224,11 +224,22 @@ namespace vcpkg::System
             env_cstr.push_back(L'\0');
         }
 
+		if (extra_env.find("PATH") != extra_env.end())
+			NEW_PATH += Strings::format(";%s", extra_env.find("PATH")->second);
         env_cstr.append(Strings::to_utf16(NEW_PATH));
         env_cstr.push_back(L'\0');
         env_cstr.append(L"VSLANG=1033");
         env_cstr.push_back(L'\0');
 
+		for (auto item : extra_env)
+		{
+			if (item.first == "PATH") continue;
+			env_cstr.append(Strings::to_utf16(item.first));
+			env_cstr.push_back(L'=');
+			env_cstr.append(Strings::to_utf16(item.second));
+			env_cstr.push_back(L'\0');
+		}
+
         STARTUPINFOW startup_info;
         memset(&startup_info, 0, sizeof(STARTUPINFOW));
         startup_info.cb = sizeof(STARTUPINFOW);
diff --git a/toolsrc/src/vcpkg/commands.env.cpp b/toolsrc/src/vcpkg/commands.env.cpp
index f3beef6cd..d078baedb 100644
--- a/toolsrc/src/vcpkg/commands.env.cpp
+++ b/toolsrc/src/vcpkg/commands.env.cpp
@@ -1,5 +1,6 @@
 #include "pch.h"
 
+#include <vcpkg/base/strings.h>
 #include <vcpkg/base/system.h>
 #include <vcpkg/build.h>
 #include <vcpkg/commands.h>
@@ -7,25 +8,66 @@
 
 namespace vcpkg::Commands::Env
 {
+    static constexpr StringLiteral OPTION_BIN = "--bin";
+    static constexpr StringLiteral OPTION_INCLUDE = "--include";
+    static constexpr StringLiteral OPTION_DEBUG_BIN = "--debug-bin";
+    static constexpr StringLiteral OPTION_TOOLS = "--tools";
+    static constexpr StringLiteral OPTION_PYTHON = "--python";
+
+    static constexpr std::array<CommandSwitch, 5> SWITCHES = {{
+        {OPTION_BIN, "Add installed bin/ to PATH"},
+        {OPTION_INCLUDE, "Add installed include/ to INCLUDE"},
+        {OPTION_DEBUG_BIN, "Add installed debug/bin/ to PATH"},
+        {OPTION_TOOLS, "Add installed tools/*/ to PATH"},
+        {OPTION_PYTHON, "Add installed python/ to PYTHONPATH"},
+    }};
+
     const CommandStructure COMMAND_STRUCTURE = {
         Help::create_example_string("env --triplet x64-windows"),
         0,
         0,
-        {},
+        {SWITCHES, {}},
         nullptr,
     };
 
-    void perform_and_exit(const VcpkgCmdArguments& args, const VcpkgPaths& paths, const Triplet& default_triplet)
+    void perform_and_exit(const VcpkgCmdArguments& args, const VcpkgPaths& paths, const Triplet& triplet)
     {
-        args.parse_arguments(COMMAND_STRUCTURE);
+        const auto& fs = paths.get_filesystem();
+
+        const ParsedArguments options = args.parse_arguments(COMMAND_STRUCTURE);
 
-        const auto pre_build_info = Build::PreBuildInfo::from_triplet_file(paths, default_triplet);
+        const auto pre_build_info = Build::PreBuildInfo::from_triplet_file(paths, triplet);
         const Toolset& toolset = paths.get_toolset(pre_build_info);
         auto env_cmd = Build::make_build_env_cmd(pre_build_info, toolset);
+
+        std::unordered_map<std::string, std::string> extra_env = {};
+        const bool add_bin = Util::Sets::contains(options.switches, OPTION_BIN);
+        const bool add_include = Util::Sets::contains(options.switches, OPTION_INCLUDE);
+        const bool add_debug_bin = Util::Sets::contains(options.switches, OPTION_DEBUG_BIN);
+        const bool add_tools = Util::Sets::contains(options.switches, OPTION_TOOLS);
+        const bool add_python = Util::Sets::contains(options.switches, OPTION_PYTHON);
+
+        std::vector<std::string> path_vars;
+        if (add_bin) path_vars.push_back((paths.installed / triplet.to_string() / "bin").u8string());
+        if (add_debug_bin) path_vars.push_back((paths.installed / triplet.to_string() / "debug" / "bin").u8string());
+        if (add_include) extra_env.emplace("INCLUDE", (paths.installed / triplet.to_string() / "include").u8string());
+        if (add_tools)
+        {
+            auto tools_dir = paths.installed / triplet.to_string() / "tools";
+            auto tool_files = fs.get_files_non_recursive(tools_dir);
+            path_vars.push_back(tools_dir.u8string());
+            for (auto&& tool_dir : tool_files)
+            {
+                if (fs.is_directory(tool_dir)) path_vars.push_back(tool_dir.u8string());
+            }
+        }
+        if (add_python) extra_env.emplace("PYTHONPATH", (paths.installed / triplet.to_string() / "python").u8string());
+        if (path_vars.size() > 0) extra_env.emplace("PATH", Strings::join(";", path_vars));
+
         if (env_cmd.empty())
-            System::cmd_execute_clean("cmd");
+            System::cmd_execute_clean("cmd", extra_env);
         else
-            System::cmd_execute_clean(env_cmd + " && cmd");
+            System::cmd_execute_clean(env_cmd + " && cmd", extra_env);
 
         Checks::exit_success(VCPKG_LINE_INFO);
     }
diff --git a/toolsrc/src/vcpkg/help.cpp b/toolsrc/src/vcpkg/help.cpp
index b7d355742..743619937 100644
--- a/toolsrc/src/vcpkg/help.cpp
+++ b/toolsrc/src/vcpkg/help.cpp
@@ -98,14 +98,10 @@ namespace vcpkg::Help
             "  vcpkg create <pkg> <url>\n"
             "             [archivename]        Create a new package\n"
             "  vcpkg owns <pat>                Search for files in installed packages\n"
-            "  vcpkg cache                     List cached compiled packages\n"
+            "  vcpkg env                       Creates a clean shell environment for development or compiling.\n"
             "  vcpkg version                   Display version information\n"
             "  vcpkg contact                   Display contact information to send feedback\n"
             "\n"
-            //"internal commands:\n"
-            //"  --check-build-deps <controlfile>\n"
-            //"  --create-binary-control <controlfile>\n"
-            //"\n"
             "Options:\n"
             "  --triplet <t>                   Specify the target architecture triplet.\n"
             "                                  (default: %%VCPKG_DEFAULT_TRIPLET%%, see 'vcpkg help triplet')\n"