Amalgamate.cpp

/*
  ==============================================================================

  Copyright (c) 2012 by Vinnie Falco

  This file is provided under the terms of the MIT License:

  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:

  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  SOFTWARE.

  ==============================================================================
*/

#include <regex>
#include <unordered_map>
#include <memory>

#include "juce_core.h"

using namespace juce;

//==============================================================================

/* Handles the @remap directive for redirecting includes to amalgamated files.
*/
class RemapTable : public std::unordered_map <std::string, std::string>
{
public:
  RemapTable () : m_pattern (
    "[ \t]*/\\*[ \t]*@remap[ \t]+\"([^\"]+)\"[ \t]+\"([^\"]+)\"[ \t]*\\*/[ \t]*")
  {
  }

  // Returns true if the line was a @remap directive
  //
  bool processLine (std::string const& line)
  {
    bool wasRemap = false;

    std::match_results <std::string::const_iterator> result;

    if (std::regex_match (line, result, m_pattern))
    {
      const_iterator iter = find (result [1]);

      if (iter == end ())
      {
        this->operator[] (result[1]) = result[2];

        //std::cout << "@remap " << result[1] << " to " << result[2] << std::endl;
      }
      else
      {
        std::cout << "Warning: duplicate @remap directive" << std::endl;
      }

      wasRemap = true;
    }

    return wasRemap;
  }

private:
  std::regex m_pattern;
  std::unordered_map <std::string, std::string> m_value;
};

//==============================================================================

/* Handles #include lines.
*/
class IncludeProcessor
{
public:
  IncludeProcessor ()
    : m_includePattern ("[ \t]*#[ \t]*include[ \t]+(.*)[ t]*")
    , m_macroPattern ("([_a-zA-Z][_0-9a-zA-Z]*)")
    , m_anglePattern ("<([^>]+)>.*")
    , m_quotePattern ("\"([^\"]+)\".*")
  {

  }

  void processLine (std::string const& line)
  {
    std::match_results <std::string::const_iterator> r1;

    if (std::regex_match (line, r1, m_includePattern))
    {
      std::string s (r1[1]);

      std::match_results <std::string::const_iterator> r2;

      if (std::regex_match (s, r2, m_macroPattern))
      {
        // r2[1] holds the macro
      }
      else if (std::regex_match (s, r2, m_anglePattern))
      {
        // std::cout << "\"" << r2[1] << "\" ";
      }
      else if (std::regex_match (s, r2, m_quotePattern))
      {
        // std::cout << "\"" << r2[1] << "\" ";
      }
    }
  }

private:
  std::regex m_includePattern;
  std::regex m_macroPattern;
  std::regex m_anglePattern;
  std::regex m_quotePattern;
};

//==============================================================================
class Amalgamator
{
public:
  RemapTable m_remapTable;
  IncludeProcessor m_includeProcessor;

  explicit Amalgamator (String toolName)
    : m_name (toolName)
    , m_verbose (false)
    , m_checkSystemIncludes (false)
    , m_tabs (false)
  {
    setWildcards ("*.cpp;*.c;*.hpp;*.h");
  }

  const String name () const
  {
    return m_name;
  }

  void setCheckSystemIncludes (bool checkSystemIncludes)
  {
    m_checkSystemIncludes = checkSystemIncludes;
  }

  void setWildcards (String wildcards)
  {
    m_wildcards.clear ();
    m_wildcards.addTokens (wildcards, ";,", "'\"");
    m_wildcards.trim();
    m_wildcards.removeEmptyStrings();

  }

  void setTemplate (String fileName)
  {
    m_templateFile = File::getCurrentWorkingDirectory().getChildFile (fileName);
  }

  void setTarget (String fileName)
  {
    m_targetFile = File::getCurrentWorkingDirectory().getChildFile (fileName);
  }

  void setVerbose ()
  {
    m_verbose = true;
  }

  void setConvertSpacesToTabs ()
  {
    m_tabs = true;
  }

  void addDirectoryToSearch (String directoryToSearch)
  {
    File dir (directoryToSearch);

    m_directoriesToSearch.add (dir.getFullPathName ());
  }

  void addPreventReinclude (String identifier)
  {
    m_preventReincludes.add (identifier);
  }

  void addForceReinclude (String identifier)
  {
    m_forceReincludes.add (identifier);
  }

  void addDefine (String name, String value)
  {
    m_macrosDefined.set (name, value);
  }

  bool process ()
  {
    // return true in case of error

    // Make sure the template file exists
    if (! m_templateFile.existsAsFile())
    {
      std::cout << name () << " The template file doesn't exist!\n\n";
      return true;
    }

    // Prepare to write output to a temporary file.

    std::cout << "  Building: " << m_targetFile.getFullPathName() << "...\n";

    TemporaryFile temp (m_targetFile);
    std::unique_ptr <FileOutputStream> out (temp.getFile().createOutputStream (1024 * 128));

    if (out == 0)
    {
      std::cout << "  \n!! ERROR - couldn't write to the target file: "
        << temp.getFile().getFullPathName() << "\n\n";
      return false;
    }

    out->setNewLineString ("\n");

    if (! parseFile (m_targetFile.getParentDirectory(),
      m_targetFile,
      *out,
      m_templateFile,
      m_alreadyIncludedFiles,
      m_includesToIgnore,
      m_wildcards,
      0, false))
    {
      return false;
    }

    out = 0;

    if (calculateFileHashCode (m_targetFile) == calculateFileHashCode (temp.getFile()))
    {
      std::cout << "   -- No need to write - new file is identical\n";
      return false;
    }

    if (! temp.overwriteTargetFileWithTemporary())
    {
      std::cout << "  \n!! ERROR - couldn't write to the target file: "
        << m_targetFile.getFullPathName() << "\n\n";
      return true;
    }

    return false;
  }

public:
  static int64 calculateStreamHashCode (InputStream& in)
  {
    int64 t = 0;

    const int bufferSize = 4096;
    HeapBlock <uint8> buffer;
    buffer.malloc (bufferSize);

    for (;;)
    {
      const int num = in.read (buffer, bufferSize);

      if (num <= 0)
        break;

      for (int i = 0; i < num; ++i)
        t = t * 65599 + buffer[i];
    }

    return t;
  }

  static int64 calculateFileHashCode (const File& file)
  {
    std::unique_ptr <FileInputStream> stream (file.createInputStream());
    return stream != 0 ? calculateStreamHashCode (*stream) : 0;
  }

private:
  bool matchesWildcard (String const& filename)
  {
    for (int i = m_wildcards.size(); --i >= 0;)
      if (filename.matchesWildcard (m_wildcards[i], true))
        return true;

    return false;
  }

  static bool canFileBeReincluded (File const& f)
  {
    String content (f.loadFileAsString());

    for (;;)
    {
      content = content.trimStart();

      if (content.startsWith ("//"))
        content = content.fromFirstOccurrenceOf ("\n", false, false);
      else if (content.startsWith ("/*"))
        content = content.fromFirstOccurrenceOf ("*/", false, false);
      else
        break;
    }

    StringArray lines;
    lines.addLines (content);
    lines.trim();
    lines.removeEmptyStrings();

    const String l1 (lines[0].removeCharacters (" \t").trim());
    const String l2 (lines[1].removeCharacters (" \t").trim());

    bool result;
    if (l1.replace ("#ifndef", "#define") == l2)
      result = false;
    else if (l1 == "#pragmaonce")
      result = false;
    else
      result = true;

    return result;
  }

  File findInclude (File const& siblingFile, String filename)
  {
    File result;

    if (siblingFile.getSiblingFile (filename).existsAsFile ())
    {
      result = siblingFile.getSiblingFile (filename);
    }
    else
    {
      for (int i = 0; i < m_directoriesToSearch.size (); ++i)
      {
        if (File (m_directoriesToSearch[i]).getChildFile (filename).existsAsFile ())
        {
          result = File (m_directoriesToSearch[i]).getChildFile (filename);
          break;
        }
      }
    }

    return result;
  }

  void findAllFilesIncludedIn (const File& hppTemplate, StringArray& alreadyIncludedFiles)
  {
    StringArray lines;
    lines.addLines (hppTemplate.loadFileAsString());

    for (int i = 0; i < lines.size(); ++i)
    {
      String line (lines[i]);

      if (line.removeCharacters (" \t").startsWithIgnoreCase ("#include\""))
      {
        const String filename (line.fromFirstOccurrenceOf ("\"", false, false)
          .upToLastOccurrenceOf ("\"", false, false));
        const File targetFile (findInclude (hppTemplate, filename));

        if (! alreadyIncludedFiles.contains (targetFile.getFullPathName()))
        {
          alreadyIncludedFiles.add (targetFile.getFullPathName());

          findAllFilesIncludedIn (targetFile, alreadyIncludedFiles);
        }
      }
    }
  }
  struct ParsedInclude
  {
    ParsedInclude ()
      : isIncludeLine (false)
      , preventReinclude (false)
      , forceReinclude (false)
      , endOfInclude (0)
    {
    }

    bool isIncludeLine;
    bool preventReinclude;
    bool forceReinclude;
    int endOfInclude;
    String lineUpToEndOfInclude;
    String lineAfterInclude;
    String filename;
  };

  ParsedInclude parseInclude (String const& line, String const& trimmed)
  {
    ParsedInclude parsed;

    if (trimmed.startsWithChar ('#'))
    {
      const String removed = trimmed.removeCharacters (" \t");

      if (removed.startsWithIgnoreCase ("#include\""))
      {
        parsed.endOfInclude = line.indexOfChar (line.indexOfChar ('\"') + 1, '\"') + 1;
        parsed.filename = line.fromFirstOccurrenceOf ("\"", false, false)
                              .upToLastOccurrenceOf ("\"", false, false);

        parsed.isIncludeLine = true;
      }
      else if (removed.startsWithIgnoreCase ("#include<") && m_checkSystemIncludes)
      {
        parsed.endOfInclude = line.indexOfChar (line.indexOfChar ('<') + 1, '>') + 1;
        parsed.filename = line.fromFirstOccurrenceOf ("<", false, false)
                              .upToLastOccurrenceOf (">", false, false);
        parsed.isIncludeLine = true;
      }
      else if (removed.startsWithIgnoreCase ("#include"))
      {
        String name;

        if (line.contains ("/*"))
          name = line.fromFirstOccurrenceOf ("#include", false, false)
                     .upToFirstOccurrenceOf ("/*", false, false).trim ();
        else
          name = line.fromFirstOccurrenceOf ("#include", false, false).trim ();

        parsed.endOfInclude = line.upToFirstOccurrenceOf (name, true, false).length ();

        String value = m_macrosDefined [name];

        if (m_verbose)
          std::cout << "name = " << name << "\n";

        if (value.startsWithIgnoreCase ("\""))
        {
          parsed.endOfInclude = line.trimEnd().length () + 1;
          parsed.filename = value.fromFirstOccurrenceOf ("\"", false, false)
                                .upToLastOccurrenceOf ("\"", false, false);

          parsed.isIncludeLine = true;
        }
        else if (value.startsWithIgnoreCase ("<") && m_checkSystemIncludes)
        {
          parsed.endOfInclude = line.trimEnd().length () + 1;
          parsed.filename = value.fromFirstOccurrenceOf ("<", false, false)
                                .upToLastOccurrenceOf (">", false, false);
          parsed.isIncludeLine = true;
        }

        parsed.preventReinclude = parsed.isIncludeLine && m_preventReincludes.contains (name);
        parsed.forceReinclude = parsed.isIncludeLine && m_forceReincludes.contains (name);
      }
    }

    return parsed;
  }

  bool parseFile (const File& rootFolder,
    const File& newTargetFile,
    OutputStream& dest,
    const File& file,
    StringArray& alreadyIncludedFiles,
    const StringArray& includesToIgnore,
    const StringArray& wildcards,
    int level,
    bool stripCommentBlocks)
  {
    // Make sure the file exists

    if (! file.exists())
    {
      std::cout << "  !! ERROR - file doesn't exist!";
      return false;
    }

    // Load the entire file as an array of individual lines.

    StringArray lines;
    lines.addLines (file.loadFileAsString());

    // Make sure there is something in the file.

    if (lines.size() == 0)
    {
      std::cout << "  !! ERROR - input file was empty: " << file.getFullPathName();
      return false;
    }

    // Produce some descriptive progress.

    if (m_verbose)
    {
      if (level == 0)
        std::cout << "  Processing \"" << file.getFileName () << "\"\n";
      else
        std::cout << "  Inlining " << String::repeatedString (" ", level - 1)
                  << "\"" << file.getFileName () << "\"\n";
    }

    bool lastLineWasBlank = true;

    for (int i = 0; i < lines.size(); ++i)
    {
      String line (lines[i]);
      String trimmed (line.trimStart());

      if ((level != 0) && trimmed.startsWith ("//================================================================"))
        line = String();

      std::string s (line.toUTF8 ());

      if (m_remapTable.processLine (s))
      {
        line = String();
      }
      else
      {
        ParsedInclude parsedInclude = parseInclude (line, trimmed);

        if (parsedInclude.isIncludeLine)
        {
          const File targetFile = findInclude (file, parsedInclude.filename);

          if (targetFile.exists())
          {
            if (matchesWildcard (parsedInclude.filename.replaceCharacter ('\\', '/'))
              && ! includesToIgnore.contains (targetFile.getFileName()))
            {
              String fileNamePart = File (parsedInclude.filename).getFileName ();
              RemapTable::iterator remapTo = m_remapTable.find (std::string (fileNamePart.toUTF8 ()));
              if (level != 0 && remapTo != m_remapTable.end ())
              {
                line = "#include \"";
                line << String(remapTo->second.c_str ()) << "\"" << newLine;

                findAllFilesIncludedIn (targetFile, alreadyIncludedFiles);
              }
              else if (line.containsIgnoreCase ("FORCE_AMALGAMATOR_INCLUDE")
                || ! alreadyIncludedFiles.contains (targetFile.getFullPathName()))
              {
                if (parsedInclude.preventReinclude)
                {
                  alreadyIncludedFiles.add (targetFile.getFullPathName());
                }
                else if (parsedInclude.forceReinclude)
                {
                }
                else if (! canFileBeReincluded (targetFile))
                {
                  alreadyIncludedFiles.add (targetFile.getFullPathName());
                }

                dest << newLine << "/*** Start of inlined file: " << targetFile.getFileName() << " ***/" << newLine;

                if (! parseFile (rootFolder, newTargetFile,
                  dest, targetFile, alreadyIncludedFiles, includesToIgnore,
                  wildcards, level + 1, stripCommentBlocks))
                {
                  return false;
                }

                dest << "/*** End of inlined file: " << targetFile.getFileName() << " ***/" << newLine << newLine;

                line = parsedInclude.lineAfterInclude;
              }
              else
              {
                line = String();
              }
            }
            else
            {
              line = parsedInclude.lineUpToEndOfInclude.upToFirstOccurrenceOf ("\"", true, false)
                + targetFile.getRelativePathFrom (newTargetFile.getParentDirectory())
                .replaceCharacter ('\\', '/')
                + "\""
                + parsedInclude.lineAfterInclude;
            }
          }
        }
      }

      if ((stripCommentBlocks || i == 0) && trimmed.startsWith ("/*") && (i > 10 || level != 0))
      {
        int originalI = i;
        String originalLine = line;

        for (;;)
        {
          int end = line.indexOf ("*/");

          if (end >= 0)
          {
            line = line.substring (end + 2);

            // If our comment appeared just before an assertion, leave it in, as it
            // might be useful..
            if (lines [i + 1].contains ("assert")
              || lines [i + 2].contains ("assert"))
            {
              i = originalI;
              line = originalLine;
            }

            break;
          }

          line = lines [++i];

          if (i >= lines.size())
            break;
        }

        line = line.trimEnd();
        if (line.isEmpty())
          continue;
      }

      line = line.trimEnd();

      if (m_tabs)
      {
        // Turn initial spaces into tabs..
        int numIntialSpaces = 0;
        int len = line.length();
        while (numIntialSpaces < len && line [numIntialSpaces] == ' ')
          ++numIntialSpaces;

        if (numIntialSpaces > 0)
        {
          int tabSize = 4;
          int numTabs = numIntialSpaces / tabSize;
          line = String::repeatedString ("\t", numTabs) + line.substring (numTabs * tabSize);
        }
      }

      if (line.isNotEmpty() || ! lastLineWasBlank)
        dest << line << newLine;

      lastLineWasBlank = line.isEmpty();
    }

    return true;
  }

private:
  const String m_name;
  bool m_verbose;
  bool m_checkSystemIncludes;
  bool m_tabs;
  StringPairArray m_macrosDefined;
  StringArray m_wildcards;
  StringArray m_forceReincludes;
  StringArray m_preventReincludes;
  StringArray m_directoriesToSearch;
  StringArray m_alreadyIncludedFiles;
  StringArray m_includesToIgnore;

  File m_templateFile;
  File m_targetFile;
};

/******************************************************************************/

//==============================================================================

void print_usage (int, char* argv[])
{
  const String name (argv[0]);

  std::cout << "\n";
  std::cout << "  NAME" << "\n";
  std::cout << "  " << "\n";
  std::cout << "   " << name << " - produce an amalgamation of C/C++ source files." << "\n";
  std::cout << "  " << "\n";
  std::cout << "  SYNOPSIS" << "\n";
  std::cout << "  " << "\n";
  std::cout << "   " << name << " [-s] [-t]" << "\n";
  std::cout << "     [-w {wildcards}]" << "\n";
  std::cout << "     [-f {file|macro}]..." << "\n";
  std::cout << "     [-p {file|macro}]..." << "\n";
  std::cout << "     [-d {name}={file}]..." << "\n";
  std::cout << "     [-i {dir}]..." << "\n";
  std::cout << "     [-h]" << "\n";
  std::cout << "     [-v]" << "\n";
  std::cout << "     {inputFile} {outputFile}" << "\n";
  std::cout << "  " << "\n";
  std::cout << "  DESCRIPTION" << "\n";
  std::cout << "  " << "\n";
  std::cout << "   Produces an amalgamation of {inputFile} by replacing #include statements with" << "\n";
  std::cout << "   the contents of the file they refer to. This replacement will only occur if" << "\n";
  std::cout << "   the file was located in the same directory, or one of the additional include" << "\n";
  std::cout << "   paths added with the -i option." << "\n";
  std::cout << "   " << "\n";
  std::cout << "   Files included in angle brackets (system includes) are only inlined if the" << "\n";
  std::cout << "   -s option is specified." << "\n";
  std::cout << "  " << "\n";
  std::cout << "   If an #include line contains a macro instead of a string literal, the list" << "\n";
  std::cout << "   of definitions provided through the -d option is consulted to convert the" << "\n";
  std::cout << "   macro into a string." << "\n";
  std::cout << "  " << "\n";
  std::cout << "   A file will only be inlined once, with subsequent #include lines for the same" << "\n";
  std::cout << "   file silently ignored, unless the -f option is specified for the file." << "\n";
  std::cout << "  " << "\n";
  std::cout << "  OPTIONS" << "\n";
  std::cout << "  " << "\n";
  std::cout << "    -s                Process #include lines containing angle brackets (i.e." << "\n";
  std::cout << "                      system includes). Normally these are not inlined." << "\n";
  std::cout << "  " << "\n";
  std::cout << "    -t                Convert spaces into tabs." << "\n";
  std::cout << "  " << "\n";
  std::cout << "    -w {wildcards}    Specify a comma separated list of file name patterns to" << "\n";
  std::cout << "                      match when deciding to inline (assuming the file can be" << "\n";
  std::cout << "                      located). The default setting is \"*.cpp;*.c;*.hpp;*.h\"." << "\n";
  std::cout << "  " << "\n";
  std::cout << "    -f {file|macro}   Force reinclusion of the specified file or macro on" << "\n";
  std::cout << "                      all appearances in #include lines." << "\n";
  std::cout << "  " << "\n";
  std::cout << "    -p {file|macro}   Prevent reinclusion of the specified file or macro on" << "\n";
  std::cout << "                      subsequent appearances in #include lines." << "\n";
  std::cout << "  " << "\n";
  std::cout << "    -d {name}={file}  Use {file} for macro {name} if it appears in an #include" << "\n";
  std::cout << "                      line." << "\n";
  std::cout << "  " << "\n";
  std::cout << "    -i {dir}          Additionally look in the specified directory for files when" << "\n";
  std::cout << "                      processing #include lines." << "\n";
  std::cout << "  " << "\n";
  std::cout << "    -h                Print help and exit" << "\n";
  std::cout << "  " << "\n";
  std::cout << "    -v                Verbose output mode" << "\n";
  std::cout << "\n";
}

int main (int argc, char* argv[])
{
  bool error = false;
  bool usage = true;

  const String name (argv[0]);

  Amalgamator amalgamator (name);
  bool gotCheckSystem = false;
  bool gotWildcards = false;
  bool gotTemplate = false;
  bool gotTarget = false;

  for (int i = 1; i < argc; ++i)
  {
    String option (argv[i]);

    String value;
    if (i + 1 < argc)
      value = String (argv[i+1]).unquoted ();

    if (option.compareIgnoreCase ("-i") == 0)
    {
      ++i;
      if (i < argc)
      {
        amalgamator.addDirectoryToSearch (value);
      }
      else
      {
        std::cout << name << ": Missing parameter for -i\n";
        error = true;
        break;
      }
    }
    else if (option.compareIgnoreCase ("-f") == 0)
    {
      ++i;
      if (i < argc)
      {
        amalgamator.addForceReinclude (value);
      }
      else
      {
        std::cout << name << ": Missing parameter for -f\n";
        error = true;
        break;
      }
    }
    else if (option.compareIgnoreCase ("-p") == 0)
    {
      ++i;
      if (i < argc)
      {
        amalgamator.addPreventReinclude (value);
      }
      else
      {
        std::cout << name << ": Missing parameter for -p\n";
        error = true;
        break;
      }
    }
    else if (option.compareIgnoreCase ("-d") == 0)
    {
      ++i;
      if (i < argc)
      {
        if (value.contains ("="))
        {
          String name = value.upToFirstOccurrenceOf ("=", false, false);
          String define = value.fromFirstOccurrenceOf ("=", false, false);

          amalgamator.addDefine (name, define);
        }
        else
        {
          std::cout << name << ": Incorrect syntax for -d\n";
        }
      }
      else
      {
        std::cout << name << ": Missing parameter for -d\n";
        error = true;
        break;
      }
    }
    else if (option.compareIgnoreCase ("-w") == 0)
    {
      ++i;
      if (i < argc)
      {
        if (!gotWildcards)
        {
          amalgamator.setWildcards (value);
        }
        else
        {
          std::cout << name << ": Duplicate option -w\n";
          error = true;
          break;
        }
      }
      else
      {
        std::cout << name << ": Missing parameter for -w\n";
        error = true;
        break;
      }
    }
    else if (option.compareIgnoreCase ("-s") == 0)
    {
      if (!gotCheckSystem)
      {
        amalgamator.setCheckSystemIncludes (true);
        gotCheckSystem = true;
      }
      else
      {
        std::cout << name << ": Duplicate option -w\n";
        error = true;
        break;
      }
    }
    else if (option.compareIgnoreCase ("-t") == 0)
    {
      amalgamator.setConvertSpacesToTabs ();
    }
    else if (option.compareIgnoreCase ("-v") == 0)
    {
      amalgamator.setVerbose ();
    }
    else if (option.compareIgnoreCase ("-h") == 0)
    {
      print_usage(argc, argv);
      return 0;
    }
    else if (option.startsWith ("-"))
    {
      std::cout << name << ": Unknown option \"" << option << "\"\n";
      error = true;
      break;
    }
    else
    {
      if (!gotTemplate)
      {
        amalgamator.setTemplate (option);
        gotTemplate = true;
      }
      else if (!gotTarget)
      {
        amalgamator.setTarget (option);
        gotTarget = true;
      }
      else
      {
        std::cout << name << ": Too many arguments\n";
        error = true;
        break;
      }
    }
  }

  if (gotTemplate && gotTarget)
  {
    usage = false;

    error = amalgamator.process ();
  }
  else
  {
    if (argc > 1)
      std::cout << name << " Too few arguments\n";

    error = true;
  }

  if (error && usage)
    print_usage(argc, argv);

  return error ? 1 : 0;
}