Add a standalone tool that runs CodeStyleChecker

README.md

@@ -265,6 +265,15 @@ the warnings with correct source code information.
 `-fcolor-diagnostics` above instructs Clang to generate color output
 (unfortunately Markdown doesn't render the colors here).
 
+### Run the plugin through `ct-code-style-checker`
+**ct-code-style-checker** is a standalone tool that will run the **CodeStyleChecker** plugin,
+but without the need of using `clang` and loading the plugin:
+
+```bash
+<build_dir>/bin/ct-code-style-checker input_file.cpp
+```
+
+
 ## Obfuscator
 The **Obfuscator** plugin will rewrite integer addition and subtraction
 according to the following formulae:

test/CodeStyleChecker-standalone-tool.cpp

@@ -0,0 +1,21 @@
+// RUN:  ../bin/ct-code-style-checker %s 2>&1 | FileCheck -implicit-check-not warning: %s
+
+// This is a rather simplified test for CodeStyleChecker that focuses on the
+// standalone wrapper tool: ct-code-style-checker. 
+//
+// Unlike `clang -cc1`, ct-code-style-checker does not support `-verify` and we
+// cannot re-use the tests implemented for the plugin (which do rely on
+// `-verify`). Instead, this test is added as a small sanity-check. For proper
+// testing of CodeStyleChecker see the other tests that use the plugin version.
+
+// CHECK: CodeStyleChecker-standalone-tool.cpp:[[@LINE+1]]:6: warning: Function names should start with lower-case letter 
+void ClangTutorFuncBad();
+void clangTutorFuncOK();
+
+// CHECK: CodeStyleChecker-standalone-tool.cpp:[[@LINE+1]]:7: warning: Type and variable names should start with upper-case letter
+class clangTutorClassBad;
+class ClangTutorClassOK;
+
+// CHECK: CodeStyleChecker-standalone-tool.cpp:[[@LINE+1]]:22: warning: `_` in names is not allowed
+class ClangTutorClass_Bad;
+class ClangTutorClassOK;

tools/CMakeLists.txt

@@ -1,27 +1,45 @@
-add_executable(lacommenter
+# THE LIST OF TOOLS AND THE CORRESPONDING SOURCE FILES
+# ====================================================
+set(CLANG_TUTOR_TOOLS
+    lacommenter
+    ct-code-refactor
+    ct-code-style-checker
+)
+
+set(lacommenter_SOURCES
   LACommenterMain.cpp
   ../lib/LACommenter.cpp
 )
 
-add_executable(ct-code-refactor
+set(ct-code-refactor_SOURCES
   CodeRefactorMain.cpp
   ../lib/CodeRefactor.cpp
 )
 
-target_link_libraries(lacommenter
-  clangTooling
-  )
+set(ct-code-style-checker_SOURCES
+  CodeStyleCheckerMain.cpp
+  ../lib/CodeStyleChecker.cpp
+)
 
-target_link_libraries(ct-code-refactor
-  clangTooling
-  )
+# CONFIGURE THE TOOLS
+# ===================
+foreach( tool ${CLANG_TUTOR_TOOLS} )
+    # Create a library corresponding to 'plugin'
+    add_executable(
+      ${tool}
+      ${${tool}_SOURCES}
+      )
 
-target_include_directories(
-  lacommenter
-  PRIVATE
-  "${CMAKE_CURRENT_SOURCE_DIR}/../include")
+    # Link with libclangTooling
+    target_link_libraries(
+      ${tool}
+      clangTooling
+    )
 
-target_include_directories(
-  ct-code-refactor
-  PRIVATE
-  "${CMAKE_CURRENT_SOURCE_DIR}/../include")
+    # Configure include directories for 'tool'
+    target_include_directories(
+      ${tool}
+      PRIVATE
+      "${CMAKE_CURRENT_SOURCE_DIR}/../include"
+    )
+endforeach()

tools/CodeStyleCheckerMain.cpp

@@ -0,0 +1,51 @@
+//==============================================================================
+// FILE:
+//    CodeStyleCheckerMain.cpp
+//
+// DESCRIPTION:
+//
+// USAGE:
+//
+// REFERENCES:
+//
+// License: The Unlicense
+//==============================================================================
+#include "CodeStyleChecker.h"
+
+#include "clang/Frontend/CompilerInstance.h"
+#include "clang/Frontend/FrontendPluginRegistry.h"
+#include "clang/Tooling/CommonOptionsParser.h"
+#include "clang/Tooling/Tooling.h"
+
+using namespace llvm;
+using namespace clang;
+
+//===----------------------------------------------------------------------===//
+// Command line options
+//===----------------------------------------------------------------------===//
+static llvm::cl::OptionCategory CSCCategory("ct-code-style-checker options");
+
+class CSCPluginAction : public PluginASTAction {
+public:
+  bool ParseArgs(const CompilerInstance &CI,
+                 const std::vector<std::string> &args) override {
+    return true;
+  }
+
+  std::unique_ptr<ASTConsumer> CreateASTConsumer(CompilerInstance &CI,
+                                                 StringRef file) override {
+    return std::make_unique<CSCConsumer>(&CI.getASTContext());
+  }
+};
+
+//===----------------------------------------------------------------------===//
+// Main driver code.
+//===----------------------------------------------------------------------===//
+int main(int Argc, const char **Argv) {
+  clang::tooling::CommonOptionsParser OptionsParser(Argc, Argv, CSCCategory);
+  clang::tooling::ClangTool Tool(OptionsParser.getCompilations(),
+                                 OptionsParser.getSourcePathList());
+
+  return Tool.run(
+      clang::tooling::newFrontendActionFactory<CSCPluginAction>().get());
+}