Genex: Add a SHELL_PATH expression

Some commands on Windows do not understand forward slash paths and
require backslashes.  In order to help projects generate shell
invocations of such commands, provide a generator expression to convert
paths to the shell-preferred path format for the current generator.
This will allow custom commands to generate paths the same way CMake
does for compiler command invocations.

3 files changed, 49 insertions, 15 deletions

diff --git a/Source/cmGeneratorExpressionNode.cxx b/Source/cmGeneratorExpressionNode.cxx
index 31b6766..1c350ab 100644
--- a/Source/cmGeneratorExpressionNode.cxx
+++ b/Source/cmGeneratorExpressionNode.cxx
@@ -13,6 +13,7 @@
 #include "cmGeneratorExpressionNode.h"
 #include "cmGlobalGenerator.h"
 #include "cmAlgorithms.h"
+#include "cmOutputConverter.h"
 
 //----------------------------------------------------------------------------
 std::string cmGeneratorExpressionNode::EvaluateDependentExpression(
@@ -1792,6 +1793,27 @@ static const
 TargetFilesystemArtifactNodeGroup<ArtifactPdbTag> targetPdbNodeGroup;
 
 //----------------------------------------------------------------------------
+static const struct ShellPathNode : public cmGeneratorExpressionNode
+{
+  ShellPathNode() {}
+
+  std::string Evaluate(const std::vector<std::string> &parameters,
+                       cmGeneratorExpressionContext *context,
+                       const GeneratorExpressionContent *content,
+                       cmGeneratorExpressionDAGChecker *) const
+  {
+    if (!cmSystemTools::FileIsFullPath(parameters.front()))
+      {
+      reportError(context, content->GetOriginalExpression(),
+                  "\"" + parameters.front() + "\" is not an absolute path.");
+      return std::string();
+      }
+    cmOutputConverter converter(context->Makefile->GetStateSnapshot());
+    return converter.ConvertDirectorySeparatorsForShell(parameters.front());
+  }
+} shellPathNode;
+
+//----------------------------------------------------------------------------
 const cmGeneratorExpressionNode*
 cmGeneratorExpressionNode::GetNode(const std::string &identifier)
 {
@@ -1846,6 +1868,7 @@ cmGeneratorExpressionNode::GetNode(const std::string &identifier)
     nodeMap["JOIN"] = &joinNode;
     nodeMap["LINK_ONLY"] = &linkOnlyNode;
     nodeMap["COMPILE_LANGUAGE"] = &languageNode;
+    nodeMap["SHELL_PATH"] = &shellPathNode;
     }
   NodeMap::const_iterator i = nodeMap.find(identifier);
   if (i == nodeMap.end())
diff --git a/Source/cmOutputConverter.cxx b/Source/cmOutputConverter.cxx
index 7be5b3f..5acae2f 100644
--- a/Source/cmOutputConverter.cxx
+++ b/Source/cmOutputConverter.cxx
@@ -142,21 +142,7 @@ std::string cmOutputConverter::ConvertToOutputFormat(const std::string& source,
     }
   else if(output == SHELL || output == WATCOMQUOTE)
     {
-        // For the MSYS shell convert drive letters to posix paths, so
-    // that c:/some/path becomes /c/some/path.  This is needed to
-    // avoid problems with the shell path translation.
-    if(this->GetState()->UseMSYSShell() && !this->LinkScriptShell)
-      {
-      if(result.size() > 2 && result[1] == ':')
-        {
-        result[1] = result[0];
-        result[0] = '/';
-        }
-      }
-    if(this->GetState()->UseWindowsShell())
-      {
-      std::replace(result.begin(), result.end(), '/', '\\');
-      }
+    result = this->ConvertDirectorySeparatorsForShell(source);
     result = this->EscapeForShell(result, true, false, output == WATCOMQUOTE);
     }
   else if(output == RESPONSE)
@@ -167,6 +153,29 @@ std::string cmOutputConverter::ConvertToOutputFormat(const std::string& source,
 }
 
 //----------------------------------------------------------------------------
+std::string cmOutputConverter::ConvertDirectorySeparatorsForShell(
+                                              const std::string& source) const
+{
+  std::string result = source;
+  // For the MSYS shell convert drive letters to posix paths, so
+  // that c:/some/path becomes /c/some/path.  This is needed to
+  // avoid problems with the shell path translation.
+  if(this->GetState()->UseMSYSShell() && !this->LinkScriptShell)
+    {
+    if(result.size() > 2 && result[1] == ':')
+      {
+      result[1] = result[0];
+      result[0] = '/';
+      }
+    }
+  if(this->GetState()->UseWindowsShell())
+    {
+    std::replace(result.begin(), result.end(), '/', '\\');
+    }
+  return result;
+}
+
+//----------------------------------------------------------------------------
 std::string cmOutputConverter::Convert(RelativeRoot remote,
                                       const std::string& local,
                                       OutputFormat output,
diff --git a/Source/cmOutputConverter.h b/Source/cmOutputConverter.h
index ed7739e..852df5d 100644
--- a/Source/cmOutputConverter.h
+++ b/Source/cmOutputConverter.h
@@ -45,6 +45,8 @@ public:
   std::string Convert(RelativeRoot remote, const std::string& local,
                       OutputFormat output = UNCHANGED,
                       bool optional = false) const;
+  std::string ConvertDirectorySeparatorsForShell(
+                                             const std::string& source) const;
 
   /**
     * Get path for the specified relative root.