cmMakefile: Add CML command spell checking

Use Levenshtein distance to track when the user may have made a typo in
a CMake language command.

.codespellrc

@@ -17,6 +17,7 @@ skip =
   Source/kwsys/*,
   Tests/RunCMake/CPack/tests/DMG_SLA/German.*,
   Tests/RunCMake/ParseImplicitData/*.input,
+  Tests/RunCMake/cmake_language/call_typo_function.cmake,
   Tests/StringFileTest/test.utf8,
   Utilities/cm*,
   *.pfx,

Source/cmMakefile.cxx

@@ -100,6 +100,12 @@ std::string const kCMAKE_CURRENT_LIST_DIR = "CMAKE_CURRENT_LIST_DIR";
 std::string const kCMAKE_CURRENT_LIST_FILE = "CMAKE_CURRENT_LIST_FILE";
 std::string const kCMAKE_PARENT_LIST_FILE = "CMAKE_PARENT_LIST_FILE";
 
+std::string findClosestCommand(std::string const& name,
+                               std::vector<std::string> const& commands)
+{
+  return cmFindClosestString(name, commands);
+}
+
 class FileScopeBase
 {
 protected:
@@ -643,6 +649,11 @@ bool cmMakefile::ExecuteCommand(cmListFileFunction const& lff,
     if (!cmSystemTools::GetFatalErrorOccurred()) {
       std::string error =
         cmStrCat("Unknown CMake command \"", lff.OriginalName(), "\".");
+      std::string const suggestion = findClosestCommand(
+        lff.OriginalName(), this->GetState()->GetCommandNames());
+      if (!suggestion.empty()) {
+        error = cmStrCat(error, " Did you mean: \"", suggestion, "\"?");
+      }
       this->IssueMessage(MessageType::FATAL_ERROR, error);
       result = false;
       cmSystemTools::SetFatalErrorOccurred();

Tests/RunCMake/cmake_language/RunCMakeTest.cmake

@@ -25,6 +25,7 @@ run_cmake(call_message_fatal_error)
 run_cmake(call_no_parameters)
 run_cmake(call_preserve_arguments)
 run_cmake(call_unknown_function)
+run_cmake(call_typo_function)
 run_cmake(eval_expand_command_name)
 run_cmake(eval_expanded_command_and_arguments)
 run_cmake(eval_extra_parameters_between_eval_and_code)

Tests/RunCMake/cmake_language/call_typo_function-result.txt

@@ -0,0 +1 @@
+1

Tests/RunCMake/cmake_language/call_typo_function-stderr.txt

@@ -0,0 +1,2 @@
+CMake Error at call_typo_function\.cmake:1 \(mesage\):
+  Unknown CMake command "mesage"\.  Did you mean: "message"\?

Tests/RunCMake/cmake_language/call_typo_function.cmake

@@ -0,0 +1 @@
+cmake_language(CALL mesage "hi")