From f9ccd0d64bdc6fabe7fde2965db762ddbf1d8e68 Mon Sep 17 00:00:00 2001
From: Pavel Belikov <pavel.fuchs.belikov@gmail.com>
Date: Tue, 25 Jun 2019 22:21:36 +0300
Subject: Fixes #74 : Fix group validation in Subparser/Command

---
 args.hxx | 29 +++++++++++++++++++----------
 test.cxx | 19 +++++++++++++++++++
 2 files changed, 38 insertions(+), 10 deletions(-)

diff --git a/args.hxx b/args.hxx
index 09c1919..da6eb54 100644
--- a/args.hxx
+++ b/args.hxx
@@ -1633,11 +1633,11 @@ namespace args
 
         public:
             Subparser(std::vector<std::string> args_, ArgumentParser &parser_, const Command &command_, const HelpParams &helpParams_)
-                : args(std::move(args_)), parser(&parser_), helpParams(helpParams_), command(command_)
+                : Group({}, Validators::AllChildGroups), args(std::move(args_)), parser(&parser_), helpParams(helpParams_), command(command_)
             {
             }
 
-            Subparser(const Command &command_, const HelpParams &helpParams_) : helpParams(helpParams_), command(command_)
+            Subparser(const Command &command_, const HelpParams &helpParams_) : Group({}, Validators::AllChildGroups), helpParams(helpParams_), command(command_)
             {
             }
 
@@ -2128,18 +2128,23 @@ namespace args
                     return;
                 }
 
-                for (Base *child: Children())
+                auto onValidationError = [&]
                 {
-                    if (child->IsGroup() && !child->Matched())
-                    {
-                        std::ostringstream problem;
-                        problem << "Group validation failed somewhere!";
+                    std::ostringstream problem;
+                    problem << "Group validation failed somewhere!";
 #ifdef ARGS_NOEXCEPT
-                        error = Error::Validation;
-                        errorMsg = problem.str();
+                    error = Error::Validation;
+                    errorMsg = problem.str();
 #else
-                        throw ValidationError(problem.str());
+                    throw ValidationError(problem.str());
 #endif
+                };
+
+                for (Base *child: Children())
+                {
+                    if (child->IsGroup() && !child->Matched())
+                    {
+                        onValidationError();
                     }
 
                     child->Validate(shortprefix, longprefix);
@@ -2148,6 +2153,10 @@ namespace args
                 if (subparser != nullptr)
                 {
                     subparser->Validate(shortprefix, longprefix);
+                    if (!subparser->Matched())
+                    {
+                        onValidationError();
+                    }
                 }
 
                 if (selectedCommand == nullptr && commandIsRequired && (Group::HasCommand() || subparserHasCommand))
diff --git a/test.cxx b/test.cxx
index b46007d..5e84398 100644
--- a/test.cxx
+++ b/test.cxx
@@ -936,6 +936,25 @@ TEST_CASE("Subparser validation works as expected", "[args]")
     REQUIRE_THROWS_AS(p.ParseArgs(std::vector<std::string>{"unknown-command"}), args::ParseError);
 }
 
+TEST_CASE("Subparser group validation works as expected", "[args]")
+{
+    int x = 0;
+    args::ArgumentParser p("parser");
+    args::Command a(p, "a", "command a", [&](args::Subparser &s)
+    {
+        args::Group required(s, "", args::Group::Validators::All);
+        args::ValueFlag<std::string> f(required, "", "", {'f'});
+        s.Parse();
+        ++x;
+    });
+
+    p.RequireCommand(false);
+    REQUIRE_NOTHROW(p.ParseArgs(std::vector<std::string>{}));
+    REQUIRE_NOTHROW(p.ParseArgs(std::vector<std::string>{"a", "-f", "F"}));
+    REQUIRE_THROWS_AS(p.ParseArgs(std::vector<std::string>{"a"}), args::ValidationError);
+    REQUIRE(x == 1);
+}
+
 TEST_CASE("Global options work as expected", "[args]")
 {
     args::Group globals;
-- 
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