CMake/Source/cmFileCommand.h

/*============================================================================
  CMake - Cross Platform Makefile Generator
  Copyright 2000-2009 Kitware, Inc., Insight Software Consortium

  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 cmFileCommand_h
#define cmFileCommand_h

#include "cmCommand.h"

struct cmFileInstaller;

/** \class cmFileCommand
 * \brief Command for manipulation of files
 *
 */
class cmFileCommand : public cmCommand
{
public:
  /**
   * This is a virtual constructor for the command.
   */
  virtual cmCommand* Clone()
    {
    return new cmFileCommand;
    }

  /**
   * This is called when the command is first encountered in
   * the CMakeLists.txt file.
   */
  virtual bool InitialPass(std::vector<std::string> const& args,
                           cmExecutionStatus &status);

  /**
   * This determines if the command is invoked when in script mode.
   */
  virtual bool IsScriptable() const { return true; }

  /**
   * The name of the command as specified in CMakeList.txt.
   */
  virtual const char* GetName() const { return "file";}

  /**
   * Succinct documentation.
   */
  virtual const char* GetTerseDocumentation() const
    {
    return "File manipulation command.";
    }

  /**
   * More documentation.
   */
  virtual const char* GetFullDocumentation() const
    {
    return
      "  file(WRITE filename \"message to write\"... )\n"
      "  file(APPEND filename \"message to write\"... )\n"
      "  file(READ filename variable [LIMIT numBytes] [OFFSET offset] [HEX])\n"
      "  file(<MD5|SHA1|SHA224|SHA256|SHA384|SHA512> filename variable)\n"
      "  file(STRINGS filename variable [LIMIT_COUNT num]\n"
      "       [LIMIT_INPUT numBytes] [LIMIT_OUTPUT numBytes]\n"
      "       [LENGTH_MINIMUM numBytes] [LENGTH_MAXIMUM numBytes]\n"
      "       [NEWLINE_CONSUME] [REGEX regex]\n"
      "       [NO_HEX_CONVERSION])\n"
      "  file(GLOB variable [RELATIVE path] [globbing expressions]...)\n"
      "  file(GLOB_RECURSE variable [RELATIVE path] \n"
      "       [FOLLOW_SYMLINKS] [globbing expressions]...)\n"
      "  file(RENAME <oldname> <newname>)\n"
      "  file(REMOVE [file1 ...])\n"
      "  file(REMOVE_RECURSE [file1 ...])\n"
      "  file(MAKE_DIRECTORY [directory1 directory2 ...])\n"
      "  file(RELATIVE_PATH variable directory file)\n"
      "  file(TO_CMAKE_PATH path result)\n"
      "  file(TO_NATIVE_PATH path result)\n"
      "  file(DOWNLOAD url file [INACTIVITY_TIMEOUT timeout]\n"
      "       [TIMEOUT timeout] [STATUS status] [LOG log] [SHOW_PROGRESS]\n"
      "       [EXPECTED_HASH ALGO=value] [EXPECTED_MD5 sum]\n"
      "       [TLS_VERIFY on|off] [TLS_CAINFO file])\n"
      "  file(UPLOAD filename url [INACTIVITY_TIMEOUT timeout]\n"
      "       [TIMEOUT timeout] [STATUS status] [LOG log] [SHOW_PROGRESS])\n"
      "  file(TIMESTAMP filename variable [<format string>] [UTC])\n"
      "  file(GENERATE OUTPUT output_file\n"
      "       <INPUT input_file|CONTENT input_content>\n"
      "       CONDITION expression)\n"
      "WRITE will write a message into a file called 'filename'. It "
      "overwrites the file if it already exists, and creates the file "
      "if it does not exist. (If the file is a build input, use "
      "configure_file to update the file only when its content changes.)\n"
      "APPEND will write a message into a file same as WRITE, except "
      "it will append it to the end of the file\n"
      "READ will read the content of a file and store it into the "
      "variable. It will start at the given offset and read up to numBytes. "
      "If the argument HEX is given, the binary data will be converted to "
      "hexadecimal representation and this will be stored in the variable.\n"
      "MD5, SHA1, SHA224, SHA256, SHA384, and SHA512 "
      "will compute a cryptographic hash of the content of a file.\n"
      "STRINGS will parse a list of ASCII strings from a file and "
      "store it in a variable. Binary data in the file are ignored. Carriage "
      "return (CR) characters are ignored. It works also for Intel Hex and "
      "Motorola S-record files, which are automatically converted to binary "
      "format when reading them. Disable this using NO_HEX_CONVERSION.\n"
      "LIMIT_COUNT sets the maximum number of strings to return. "
      "LIMIT_INPUT sets the maximum number of bytes to read from "
      "the input file. "
      "LIMIT_OUTPUT sets the maximum number of bytes to store in the "
      "output variable. "
      "LENGTH_MINIMUM sets the minimum length of a string to return. "
      "Shorter strings are ignored. "
      "LENGTH_MAXIMUM sets the maximum length of a string to return.  Longer "
      "strings are split into strings no longer than the maximum length. "
      "NEWLINE_CONSUME allows newlines to be included in strings instead "
      "of terminating them.\n"
      "REGEX specifies a regular expression that a string must match to be "
      "returned. Typical usage \n"
      "  file(STRINGS myfile.txt myfile)\n"
      "stores a list in the variable \"myfile\" in which each item is "
      "a line from the input file.\n"
      "GLOB will generate a list of all files that match the globbing "
      "expressions and store it into the variable. Globbing expressions "
      "are similar to regular expressions, but much simpler. If RELATIVE "
      "flag is specified for an expression, the results will be returned "
      "as a relative path to the given path.  "
      "(We do not recommend using GLOB to collect a list of source files "
      "from your source tree.  If no CMakeLists.txt file changes when a "
      "source is added or removed then the generated build system cannot "
      "know when to ask CMake to regenerate.)"
      "\n"
      "Examples of globbing expressions include:\n"
      "   *.cxx      - match all files with extension cxx\n"
      "   *.vt?      - match all files with extension vta,...,vtz\n"
      "   f[3-5].txt - match files f3.txt, f4.txt, f5.txt\n"
      "GLOB_RECURSE will generate a list similar to the regular GLOB, except "
      "it will traverse all the subdirectories of the matched directory and "
      "match the files. Subdirectories that are symlinks are only traversed "
      "if FOLLOW_SYMLINKS is given or cmake policy CMP0009 is not set to NEW. "
      "See cmake --help-policy CMP0009 for more information.\n"
      "Examples of recursive globbing include:\n"
      "   /dir/*.py  - match all python files in /dir and subdirectories\n"
      "MAKE_DIRECTORY will create the given directories, also if their parent "
      "directories don't exist yet\n"
      "RENAME moves a file or directory within a filesystem, "
      "replacing the destination atomically."
      "\n"
      "REMOVE will remove the given files, also in subdirectories\n"
      "REMOVE_RECURSE will remove the given files and directories, also "
      "non-empty directories\n"
      "RELATIVE_PATH will determine relative path from directory to the given"
      " file.\n"
      "TO_CMAKE_PATH will convert path into a cmake style path with unix /. "
      " The input can be a single path or a system path like \"$ENV{PATH}\". "
      " Note the double quotes around the ENV call TO_CMAKE_PATH only takes "
      " one argument. This command will also convert the native list"
      " delimiters for a list of paths like the PATH environment variable.\n"
      "TO_NATIVE_PATH works just like TO_CMAKE_PATH, but will convert from "
      " a cmake style path into the native path style \\ for windows and / "
      "for UNIX.\n"
      "DOWNLOAD will download the given URL to the given file. "
      "If LOG var is specified a log of the download will be put in var. "
      "If STATUS var is specified the status of the operation will"
      " be put in var. The status is returned in a list of length 2. "
      "The first element is the numeric return value for the operation, "
      "and the second element is a string value for the error. A 0 "
      "numeric error means no error in the operation. "
      "If TIMEOUT time is specified, the operation will "
      "timeout after time seconds, time should be specified as an integer. "
      "The INACTIVITY_TIMEOUT specifies an integer number of seconds of "
      "inactivity after which the operation should terminate. "
      "If EXPECTED_HASH ALGO=value is specified, the operation will verify "
      "that the downloaded file's actual hash matches the expected value, "
      "where ALGO is one of MD5, SHA1, SHA224, SHA256, SHA384, or SHA512.  "
      "If it does not match, the operation fails with an error. "
      "(\"EXPECTED_MD5 sum\" is short-hand for \"EXPECTED_HASH MD5=sum\".) "
      "If SHOW_PROGRESS is specified, progress information will be printed "
      "as status messages until the operation is complete. "
      "For https URLs CMake must be built with OpenSSL.  "
      "TLS/SSL certificates are not checked by default.  "
      "Set TLS_VERIFY to ON to check certificates and/or use "
      "EXPECTED_HASH to verify downloaded content.  "
      "Set TLS_CAINFO to specify a custom Certificate Authority file.  "
      "If either TLS option is not given CMake will check variables "
      "CMAKE_TLS_VERIFY and CMAKE_TLS_CAINFO, "
      "respectively."
      "\n"
      "UPLOAD will upload the given file to the given URL. "
      "If LOG var is specified a log of the upload will be put in var. "
      "If STATUS var is specified the status of the operation will"
      " be put in var. The status is returned in a list of length 2. "
      "The first element is the numeric return value for the operation, "
      "and the second element is a string value for the error. A 0 "
      "numeric error means no error in the operation. "
      "If TIMEOUT time is specified, the operation will "
      "timeout after time seconds, time should be specified as an integer. "
      "The INACTIVITY_TIMEOUT specifies an integer number of seconds of "
      "inactivity after which the operation should terminate. "
      "If SHOW_PROGRESS is specified, progress information will be printed "
      "as status messages until the operation is complete."
      "\n"
      "TIMESTAMP will write a string representation of "
      "the modification time of filename to variable.\n"
      "Should the command be unable to obtain a timestamp "
      "variable will be set to the empty string \"\".\n"
      "See documentation of the string TIMESTAMP sub-command for more details."
      "\n"
      "The file() command also provides COPY and INSTALL signatures:\n"
      "  file(<COPY|INSTALL> files... DESTINATION <dir>\n"
      "       [FILE_PERMISSIONS permissions...]\n"
      "       [DIRECTORY_PERMISSIONS permissions...]\n"
      "       [NO_SOURCE_PERMISSIONS] [USE_SOURCE_PERMISSIONS]\n"
      "       [FILES_MATCHING]\n"
      "       [[PATTERN <pattern> | REGEX <regex>]\n"
      "        [EXCLUDE] [PERMISSIONS permissions...]] [...])\n"
      "The COPY signature copies files, directories, and symlinks to a "
      "destination folder.  "
      "Relative input paths are evaluated with respect to the current "
      "source directory, and a relative destination is evaluated with "
      "respect to the current build directory.  "
      "Copying preserves input file timestamps, and optimizes out a file "
      "if it exists at the destination with the same timestamp.  "
      "Copying preserves input permissions unless explicit permissions or "
      "NO_SOURCE_PERMISSIONS are given (default is USE_SOURCE_PERMISSIONS).  "
      "See the install(DIRECTORY) command for documentation of permissions, "
      "PATTERN, REGEX, and EXCLUDE options.  "
      "\n"
      "The INSTALL signature differs slightly from COPY: "
      "it prints status messages, and NO_SOURCE_PERMISSIONS is default.  "
      "Installation scripts generated by the install() command use this "
      "signature (with some undocumented options for internal use)."
      "\n"
      "GENERATE will write an <output_file> with content from an "
      "<input_file>, or from <input_content>.  The output is generated "
      "conditionally based on the content of the <condition>.  The file is "
      "written at CMake generate-time and the input may contain generator "
      "expressions.  The <condition>, <output_file> and <input_file> may "
      "also contain generator expressions.  The <condition> must evaluate to "
      "either '0' or '1'.  The <output_file> must evaluate to a unique name "
      "among all configurations and among all invocations of file(GENERATE)."
      // Undocumented INSTALL options:
      //  - RENAME <name>
      //  - OPTIONAL
      //  - FILES keyword to re-enter files... list
      //  - PERMISSIONS before REGEX is alias for FILE_PERMISSIONS
      //  - DIR_PERMISSIONS is alias for DIRECTORY_PERMISSIONS
      //  - TYPE <FILE|DIRECTORY|EXECUTABLE|PROGRAM|
      //          STATIC_LIBRARY|SHARED_LIBRARY|MODULE>
      //  - COMPONENTS, CONFIGURATIONS, PROPERTIES (ignored for compat)
      ;
    }

  cmTypeMacro(cmFileCommand, cmCommand);

protected:
  bool HandleRename(std::vector<std::string> const& args);
  bool HandleRemove(std::vector<std::string> const& args, bool recurse);
  bool HandleWriteCommand(std::vector<std::string> const& args, bool append);
  bool HandleReadCommand(std::vector<std::string> const& args);
  bool HandleHashCommand(std::vector<std::string> const& args);
  bool HandleStringsCommand(std::vector<std::string> const& args);
  bool HandleGlobCommand(std::vector<std::string> const& args, bool recurse);
  bool HandleMakeDirectoryCommand(std::vector<std::string> const& args);

  bool HandleRelativePathCommand(std::vector<std::string> const& args);
  bool HandleCMakePathCommand(std::vector<std::string> const& args,
                              bool nativePath);
  bool HandleRPathChangeCommand(std::vector<std::string> const& args);
  bool HandleRPathCheckCommand(std::vector<std::string> const& args);
  bool HandleRPathRemoveCommand(std::vector<std::string> const& args);
  bool HandleDifferentCommand(std::vector<std::string> const& args);

  bool HandleCopyCommand(std::vector<std::string> const& args);
  bool HandleInstallCommand(std::vector<std::string> const& args);
  bool HandleDownloadCommand(std::vector<std::string> const& args);
  bool HandleUploadCommand(std::vector<std::string> const& args);

  bool HandleTimestampCommand(std::vector<std::string> const& args);
  bool HandleGenerateCommand(std::vector<std::string> const& args);

private:
  void AddEvaluationFile(const std::string &inputName,
                         const std::string &outputExpr,
                         const std::string &condition,
                         bool inputIsContent);
};


#endif