server-mode: Add command to compute the build system

Help/manual/cmake-server.7.rst

@@ -355,3 +355,22 @@ CMake will reply like this (after reporting progress for some time)::
   [== CMake Server ==[
   {"cookie":"","inReplyTo":"configure","type":"reply"}
   ]== CMake Server ==]
+
+
+Type "compute"
+^^^^^^^^^^^^^^
+
+This requist will generate build system files in the build directory and
+is only available after a project was successfully "configure"d.
+
+Example::
+
+  [== CMake Server ==[
+  {"type":"compute"}
+  ]== CMake Server ==]
+
+CMake will reply (after reporting progress information)::
+
+  [== CMake Server ==[
+  {"cookie":"","inReplyTo":"compute","type":"reply"}
+  ]== CMake Server ==]

Source/cmServerDictionary.h

@@ -16,6 +16,7 @@
 
 // Vocabulary:
 
+static const std::string kCOMPUTE_TYPE = "compute";
 static const std::string kCONFIGURE_TYPE = "configure";
 static const std::string kERROR_TYPE = "error";
 static const std::string kGLOBAL_SETTINGS_TYPE = "globalSettings";

Source/cmServerProtocol.cxx

@@ -280,6 +280,9 @@ const cmServerResponse cmServerProtocol1_0::Process(
 {
   assert(this->m_State >= STATE_ACTIVE);
 
+  if (request.Type == kCOMPUTE_TYPE) {
+    return this->ProcessCompute(request);
+  }
   if (request.Type == kCONFIGURE_TYPE) {
     return this->ProcessConfigure(request);
   }
@@ -298,6 +301,26 @@ bool cmServerProtocol1_0::IsExperimental() const
   return true;
 }
 
+cmServerResponse cmServerProtocol1_0::ProcessCompute(
+  const cmServerRequest& request)
+{
+  if (this->m_State > STATE_CONFIGURED) {
+    return request.ReportError("This build system was already generated.");
+  }
+  if (this->m_State < STATE_CONFIGURED) {
+    return request.ReportError("This project was not configured yet.");
+  }
+
+  cmake* cm = this->CMakeInstance();
+  int ret = cm->Generate();
+
+  if (ret < 0) {
+    return request.ReportError("Failed to compute build system.");
+  }
+  m_State = STATE_COMPUTED;
+  return request.Reply(Json::Value());
+}
+
 cmServerResponse cmServerProtocol1_0::ProcessConfigure(
   const cmServerRequest& request)
 {

Source/cmServerProtocol.h

@@ -118,6 +118,7 @@ private:
                   std::string* errorMessage) override;
 
   // Handle requests:
+  cmServerResponse ProcessCompute(const cmServerRequest& request);
   cmServerResponse ProcessConfigure(const cmServerRequest& request);
   cmServerResponse ProcessGlobalSettings(const cmServerRequest& request);
   cmServerResponse ProcessSetGlobalSettings(const cmServerRequest& request);
@@ -126,7 +127,8 @@ private:
   {
     STATE_INACTIVE,
     STATE_ACTIVE,
-    STATE_CONFIGURED
+    STATE_CONFIGURED,
+    STATE_COMPUTED
   };
   State m_State = STATE_INACTIVE;
 };