file: Add GENERATE command to produce files at generate time

The idea is to write to a temp file which contains generator
expressions, and at generate time, evaluate the generator expressions,
and write the result to a file.

Because executables on Windows are limited in the length of command line
it is possible to use, it is common to write command line arguments to a
file instead and specify the file as a source of arguments.

This new FILE(GENERATE) subcommand allows the use of generator
expressions to create such files so that they can be used with
add_custom_command for example.

1 files changed, 48 insertions, 0 deletions

diff --git a/Source/cmGeneratorExpressionEvaluationFile.h b/Source/cmGeneratorExpressionEvaluationFile.h
new file mode 100644
index 0000000..20ee5cb
--- /dev/null
+++ b/Source/cmGeneratorExpressionEvaluationFile.h
@@ -0,0 +1,48 @@
+/*============================================================================
+  CMake - Cross Platform Makefile Generator
+  Copyright 2013 Stephen Kelly <steveire@gmail.com>
+
+  Distributed under the OSI-approved BSD License (the "License");
+  see accompanying file Copyright.txt for details.
+
+  This software is distributed WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the License for more information.
+============================================================================*/
+#ifndef cmGeneratorExpressionEvaluationFile_h
+#define cmGeneratorExpressionEvaluationFile_h
+
+#include "cmStandardIncludes.h"
+#include <cmsys/auto_ptr.hxx>
+
+#include "cmGeneratorExpression.h"
+
+//----------------------------------------------------------------------------
+class cmGeneratorExpressionEvaluationFile
+{
+public:
+  cmGeneratorExpressionEvaluationFile(const std::string &input,
+        cmsys::auto_ptr<cmCompiledGeneratorExpression> outputFileExpr,
+        cmMakefile *makefile,
+        cmsys::auto_ptr<cmCompiledGeneratorExpression> condition,
+        bool inputIsContent);
+
+  void Generate();
+
+  std::vector<std::string> GetFiles() const { return this->Files; }
+
+private:
+  void Generate(const char *config,
+              cmCompiledGeneratorExpression* inputExpression,
+              std::map<std::string, std::string> &outputFiles);
+
+private:
+  const std::string Input;
+  const cmsys::auto_ptr<cmCompiledGeneratorExpression> OutputFileExpr;
+  cmMakefile *Makefile;
+  const cmsys::auto_ptr<cmCompiledGeneratorExpression> Condition;
+  std::vector<std::string> Files;
+  const bool InputIsContent;
+};
+
+#endif