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[h316.git] / pc-tools / ldc2 / src / configuration_manager.cpp

/******************************************************************************
 * 
 * LDC2 source code
 *
 * $Date: 2007/03/26 04:05:37 $
 * $Author: hachti $
 *
 * $Log: configuration_manager.cpp,v $
 * Revision 2.1  2007/03/26 04:05:37  hachti
 * *** empty log message ***
 *
 * Revision 2.0  2007-03-26 01:00:38  hachti
 * *** empty log message ***
 *
 *
 ******************************************************************************/
 
#include "configuration_manager.hh"
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>

#define MAX_LINE_LENGTH 80

/*!
 *\brief Constructor.
 *
 * This constructor makes a new configuration_manager ready to use.
 *\arg name Name of the application as mentioned in the
 *     "Use: <appname> ..." help message.
 */
configuration_manager::configuration_manager(string  name){
  app_name=name;
}

  
/*!
 *\brief Add a new configuration value to be searched for.
 *\param shortname A character for the short form. 
 *                 For example the o in -o
 *\param longname  The double dash longname. For example 
 *                 output_file in --output_file=
 *\param description A detailed description of the value.
 *\param status Pointer to an integer. Will be set to 1 if arg found.
 *\param target Pointer to string to put the value in. 
 *\param placeholder A placeholder for the documentation. 
 *             For example <filename> in -f<filename>
 *\param allow_cmdline Specifies if this value may be specified on the
 *                     command line.
 *\param allow_conffile Specifies if this value may be specified in a
 *                      configuration file.
 *
 */
void configuration_manager::add_option_value (const string & shortname, 
					      const string & longname,
					      const string & description, 
					      int * status, 
					      string * target, 
					      const string & placeholder,
					      const bool & allow_cmdline,
					      const bool & allow_conffile
					      ){
  
  if(status!=NULL) if (target!=NULL)
    option_values.insert(option_values.end(), 
			 opt_value_t(shortname,
				     longname, 
				     description,
				     status,
				     target,
				     placeholder,
				     allow_cmdline,
				     allow_conffile
				     )
			 );
}


  
/*!
 *\brief Add a new configuration switch to be searched for.
 *\param shortname A character for the short form. 
 *                 For example the h in -h
 *\param longname  The double dash longname. For example 
 *                 help in --help
 *\param description A detailed description of the value.
 *\param status Pointer to an integer. Will be set to 1 if arg found.
 *\param allow_cmdline Specifies whether the switch is acceptable on the 
 *       command line.
 *\param allow_conffile Specifies whether the switch is acceptable 
 *       in a configuration file.
 */
void configuration_manager::add_option_switch (const string & shortname, 
					       const string & longname,
					       const string & description, 
					       int * status, 
					       const bool & allow_cmdline,
					       const bool & allow_conffile
					       ){
  
  if(status!=NULL) 
    option_switches.insert(option_switches.end(), 
			   opt_switch_t(shortname,
				       longname, 
				       description,
				       status,
				       allow_cmdline,
				       allow_conffile)
			   );
}

/*!
 *\brief Add an accepted argument to the argument reader.
 *\param placeholder Something like "<input-file>".
 *\param description Text describing the argument.
 *\param status A pointer to a status variable. Will be set to 0 by default.
 *       If the argument is filled in, it will be set to 1.
 *\param target A pointer to a c++ string where the argument goes to.
 *
 *\note Arguments are filled in the order of adding them to the 
 *      argument reader.
 *      There would be no other way to determine the order.
 */
void configuration_manager::add_argument(const string & description,  
					 int * status, 
					 string * target,
					 const string & placeholder){

					  

  if (target!=NULL) if(status!=NULL)
    cmd_args.insert(cmd_args.end(),cmd_arg_t(placeholder,
					     description,
					     status,
					     target));
}


/*!
 *\brief Read in the args passed to main().
 *\returns empty vector on success or the error messages to be output.
 */
vector<string> configuration_manager::read_args(int argc, char ** args){
  
  vector<string> messages;
  vector<string> argv;
  
  // First we make a C++ string vector out of the **argv.
  for (char ** akt=args+1; *akt ;akt++) argv.insert(argv.end(),string(*akt));
  
  // Counter for the free command line parameters.
  unsigned int free_parms_count=0;

  // Loop through the command line arguments
  for (unsigned int arg_no=0;arg_no<argv.size();arg_no++){
    bool found=false;
    string argstring;
    
    // Look for long parameters.
    if ((argv[arg_no].substr(0,2)=="--")&&(free_parms_count==0)){
      argstring=argv[arg_no].substr(2);

      // Look for long switches.
      for (unsigned int switch_no=0;switch_no<option_switches.size();switch_no++){
	string switch_name=option_switches[switch_no].longname;
	if (argstring.compare(0,switch_name.length(),switch_name,0,switch_name.length())==0){
	  string value=analyse_string(argstring);
	  bool result=analyse_bool(value);
	  if(option_switches[switch_no].allow_cmdline==true){
	    *(option_switches[switch_no].status)=result;
	  }else{
	    messages.insert(messages.end(),"Switch \"--"
			    +option_switches[switch_no].longname
			    +"\" is not allowed on the command line!");
	  }
	  found=true;
	  break;
	}
      }

      // Look for long values.
      for (unsigned int value_no=0;value_no<option_values.size();value_no++){
	string value_name=option_values[value_no].longname;
	if (argstring.compare(0,value_name.length(),value_name,0,value_name.length())==0){
	  string value=analyse_string(argstring);
	  if(option_values[value_no].allow_cmdline==true){
	    *(option_values[value_no].status)=1;
	    *(option_values[value_no].target)=value;
	  }else{
	    messages.insert(messages.end(),"Option value \"--"
			    +option_values[value_no].longname
			    +"\" is not allowed on the command line!");
	  }
	  found=true;
	  break;
	}
      }
      if (! found) {
	messages.insert(messages.begin(),"Unknown option: --"+argstring+"!");
	found=true; // Oh!
      }
    }

    // Look for short parameters
    if ((argv[arg_no].substr(0,1)=="-")&&(free_parms_count==0)&&(!found)){ // Short parameters
      found=true;
      argstring=argv[arg_no].substr(1); // Reassign, with one more character now
      for (unsigned int pos=0;pos < argstring.length();pos++){
	bool short_found=false;
	
	// First, find short switches
	for (unsigned int switch_no=0;switch_no<option_switches.size();switch_no++){
	  string short_name=option_switches[switch_no].shortname;
	  if (short_name.compare(0,short_name.length(),argstring,pos,short_name.length())==0){
	    if(option_switches[switch_no].allow_cmdline==true){
	      *(option_switches[switch_no].status)=1;
	    }else{
	      messages.insert(messages.end(),"Switch \"-"
			      +option_switches[switch_no].shortname
			      +"\" is not allowed on the command line!");
	    }
	    short_found=true;
	    pos+=short_name.length()-1;
	    break;
	  }
	}
	
	// Now, find short values
	if (!short_found){
	  for (unsigned int value_no=0;value_no<option_values.size();value_no++){
	    string short_name=option_values[value_no].shortname;
	    
	    if (short_name.compare(0,short_name.length(),argstring,pos,short_name.length())==0){
	      if (pos==argstring.length()-1){ // Last character, where's the value?
		if (arg_no<argv.size()-1){ // Take next complete argument as value!
		  *(option_values[value_no].status)=1;
		  *(option_values[value_no].target)=argv[arg_no+1];
		  arg_no+=1; // Consume the next argument
		  short_found=true;
		} else { // No argument left!
		  messages.insert(messages.begin(),"Missing value for -"+short_name+"!");
		  short_found=true;
		}
	      } else {
		if(option_values[value_no].allow_cmdline==true){
		  *(option_values[value_no].status)=1;
		  *(option_values[value_no].target)=argstring.substr(pos+1);
		}else{
		  messages.insert(messages.end(),"Option value \"-"
				  +option_values[value_no].shortname
				  +"\" is not allowed on the command line!");
		}
		pos=argstring.length(); // Do not analyse other characters.
		short_found=true;
		break;
	      }
	    }
	  }
	}
	if (!short_found) messages.insert(messages.begin(),"Unknown Option: -"+argstring.substr(pos,1)+"!");
      }
    }
    
    if (!found) { // Must be a free form parameter...
      if (free_parms_count<cmd_args.size()){ // Space available
	*(cmd_args[free_parms_count].target)=argv[arg_no];
	*(cmd_args[free_parms_count].status)=1;
	free_parms_count++;
      } else { // No more space for free form parameters!
	messages.insert(messages.begin(),"Too many arguments!");
      }
    }
  }
  if (!messages.empty()){
    messages.insert(messages.begin(),"Error!");
    messages.insert(messages.begin(),"");
  }
  return messages;
}
  

/*!
 *\brief Extract a value from a configuration file line or
 *       a command line argument
 */
string configuration_manager::analyse_string(const string & line){
  string result="";
  unsigned int pos=line.find("=");
  if (pos!=string::npos) result=line.substr(pos+1);
  return result;
}

/*!
 *\brief Extract a boolean value out of a string, defaulting to true
 *
 * Used for commandline switches
 */
bool configuration_manager::analyse_bool(const string & data){
  if ((data.find("false",0)!=string::npos)||
      (data.find("0",0)!=string::npos)||
      (data.find("no",0)!=string::npos)) return false;
  else return true;
}


/*!
 *\brief Extract a boolean value out of a string, defaulting to false
 *
 * Used for configuration file switches
 */
bool configuration_manager::analyse_bool_false(const string & data){
  if ((data.find("true",0)!=string::npos)||
      (data.find("1",0)!=string::npos)||
      (data.find("yes",0)!=string::npos)) return true;
  else return false;
}


/*!
 *brief Read in and parse a configuration file.
 *\arg file String containing the filename
 *\return Empty Vector or Vector full of strings containing
 *        the error message(s).
 */
vector<string> configuration_manager::read_file(string filename){
  vector<string>result;
  FILE * fp=fopen(filename.c_str(),"r");
  if (! fp) {
    result.insert(result.end(),"Could not open file: "+filename);
  } else {
    char buffer[1000];
    while(fgets(buffer,1000,fp)){
      if (buffer[strlen(buffer)-1]=='\n')// Cut trailing newline
	buffer[strlen(buffer)-1]=0; 
      if (strlen (buffer)){
	char*l2=buffer+strspn(buffer," \t");
	if (l2[0]!='#'){
	  string argstring=l2;
	  unsigned int pos=argstring.find("=");
	  if (pos==0){
	    result.insert(result.end(),"In File "+filename+": Line beginning with '='!");
	  }
	  
	  bool found=false;
	  
	  // Look for long switches.
	  for (unsigned int switch_no=0;switch_no<option_switches.size();switch_no++){
	    string switch_name=option_switches[switch_no].longname;
	    if (argstring.compare(0,switch_name.length(),switch_name,0,switch_name.length())==0){
	      string value=analyse_string(argstring);
	      //result.insert(result.end(),"argstring:\""+argstring+"\"");
	      bool res=analyse_bool_false(value);
	      if(option_switches[switch_no].allow_conffile==true){
		*(option_switches[switch_no].status)=res;
	      }else{
		result.insert(result.end(),"In File "+filename+": Switch \""
			      +option_switches[switch_no].longname
			      +"\" is not allowed in config files!");
	      }
	      found=true;
	      break;
	    }
	  }
	  
	  // Look for long values.
	  for (unsigned int value_no=0;value_no<option_values.size();value_no++){
	    string value_name=option_values[value_no].longname;
	    if (argstring.compare(0,value_name.length(),value_name,0,value_name.length())==0){
	      string value=analyse_string(argstring);
	      *(option_values[value_no].status)=1;
	      
	      if(option_values[value_no].allow_conffile==true){
		*(option_values[value_no].status)=1;
		*(option_values[value_no].target)=value;	      
	      }else{
		result.insert(result.end(),"In File "+filename+": Option value \""
			      +option_values[value_no].longname
			      +"\" is not allowed in config files!");
	      }
	      found=true;
	      break;
	    }
	  }
	  if (! found) {
	  result.insert(result.end(),"In File "+filename+": Unknown option: "+argstring+"!");
	  }
	  
	} // if not #
      } // if (strlen())
    } // while(...)
    fclose (fp);
  } // fp==0 else branch
  
  if (!result.empty()){
    result.insert(result.begin(),"Error!");
    result.insert(result.begin(),"");
  }
  return result;
}


/*!
 *\brief Generate help.
 *\arg target Reference to a vector<string> to which lots of helpful
 *     strings are appended.
 */
void configuration_manager::get_help(vector<string> & target){
  target.insert(target.end(),"");
  string line="Usage: "+app_name;

  for (vector<opt_switch_t>::iterator parm_p=option_switches.begin();parm_p<option_switches.end();parm_p++){
    string addstr=" [-"+parm_p->shortname;
    addstr+="]";
    if (line.length()+addstr.length()>MAX_LINE_LENGTH){
      target.insert(target.end(),line);
      line=string(7+app_name.length(),' ');
    }
    line+=addstr;
  }

  for (vector<opt_value_t>::iterator parm_p=option_values.begin();parm_p<option_values.end();parm_p++){
    string addstr=" [-"+parm_p->shortname;
    addstr+=parm_p->placeholder;
    addstr+="]";
    if (line.length()+addstr.length()>MAX_LINE_LENGTH){
      target.insert(target.end(),line);
      line=string(7+app_name.length(),' ');
    }
    line+=addstr;
  }

  for (vector<cmd_arg_t>::iterator parm_p=cmd_args.begin();parm_p<cmd_args.end();parm_p++){
    if (line.length()+parm_p->placeholder.length()>MAX_LINE_LENGTH){
      target.insert(target.end(),line);
      line=string(7+app_name.length(),' ');
    }
    line+=" ["+parm_p->placeholder+"]";
  }
  target.insert(target.end(),line);
  
  /* Here comes the documentation output. */
  
  vector<string> left,right;
  unsigned int max_width;
  
  /* Output switches? */
  if (option_switches.size()){
    target.insert(target.end(),"");
    target.insert(target.end(),"Switches:");
    
    left=vector<string>();
    right=vector<string>();
    max_width=0;
        
    /* Now lets insert switches into left and right */
    for (unsigned int sw=0; sw<option_switches.size();sw++){
      opt_switch_t akt_sw=option_switches[sw];
      string rline=akt_sw.description;
      string lline="-"+akt_sw.shortname+", --"+akt_sw.longname;
      left.insert(left.end(),lline);
      right.insert(right.end(),rline);
    }
    
    // Determine maximal width for left column
    max_width=0;
    for (unsigned int c=0; c<left.size();c++)
      if(left[c].length()>max_width) max_width=left[c].length();
    
    /* output all the mess */
    for (unsigned int c=0; c<left.size();c++){
      string nl(max_width,' ');
      nl.replace(0,left[c].length(),left[c]);
      nl+="  "+right[c];
      while (nl.length()>80){ // Too long???
	int limit=nl.find_last_of(' ',MAX_LINE_LENGTH+1);
	target.insert(target.end(),nl.substr(0,limit));
	nl=string(max_width+2,' ')+nl.substr(limit+1);
      } 
      target.insert(target.end(),nl);
    }
  }
  
  // Output values
  if (option_values.size()){
    target.insert(target.end(),"");
    target.insert(target.end(),"Option values:");
    
    left=vector<string>();
    right=vector<string>();
    max_width=0;
    
    for (unsigned int val=0; val<option_values.size();val++){
      opt_value_t akt_val=option_values[val];
      string rline=akt_val.description;
      string lline=" -"+akt_val.shortname+akt_val.placeholder+", --"+
	akt_val.longname+"="+akt_val.placeholder;
      left.insert(left.end(),lline);
      right.insert(right.end(),rline);
    }
    
    // Determine maximal width for left column
    for (unsigned int c=0; c<left.size();c++)
      if(left[c].length()>max_width) max_width=left[c].length();
    /* output all the mess */
    for (unsigned int c=0; c<left.size();c++){
      string nl(max_width,' ');
      nl.replace(0,left[c].length(),left[c]);
      nl+="  "+right[c];
      while (nl.length()>80){ // Too long???
	int limit=nl.find_last_of(' ',MAX_LINE_LENGTH+1);
	target.insert(target.end(),nl.substr(0,limit));
	nl=string(max_width+2,' ')+nl.substr(limit+1);
      } 
      target.insert(target.end(),nl);
    }
  }

  /* Output the Arguments */
  if (cmd_args.size()){
    target.insert(target.end(),"");
    target.insert(target.end(),"Arguments:");
    
    left=vector<string>();
    right=vector<string>();
    max_width=0;
        
    for (unsigned int arg=0; arg<cmd_args.size();arg++){
      cmd_arg_t akt_arg=cmd_args[arg];
      left.insert(left.end(),akt_arg.placeholder);
      right.insert(right.end(),akt_arg.description);
    }
    
    // Determine maximal width for left column
    max_width=0;
    for (unsigned int c=0; c<left.size();c++)
      if(left[c].length()>max_width) max_width=left[c].length();
    
    for (unsigned int c=0; c<left.size();c++){
      string nl(max_width,' ');
      nl.replace(0,left[c].length(),left[c]);
      nl+="  "+right[c];
      while (nl.length()>MAX_LINE_LENGTH){ // Too long???
	int limit=nl.find_last_of(' ',MAX_LINE_LENGTH+1);
	//      printf("limit:%i\n",limit);
	target.insert(target.end(),nl.substr(0,limit));
	nl=string(max_width+2,' ')+nl.substr(limit+1);
      } 
      target.insert(target.end(),nl);
    }
    target.insert(target.end(),"");
  }
}

/*!
 *\brief Generate help.
 *\return A vector containing many helpful strings for the user.
 */
vector<string> configuration_manager::get_help(){
  vector<string> result;
  get_help(result);
  return result;
}


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


configuration_manager::opt_value_t::opt_value_t(const string & shortname, 
						const string & longname,
						const string & description, 
						int * status, 
						string * target, 
						const string & placeholder,
						const bool & allow_conffile,
						const bool & allow_cmdline
						){
  this->shortname=shortname;
  this->longname=longname;
  this->description=description;
  this->status=status;
  this->target=target;
  this->placeholder=placeholder;
  this->allow_conffile=allow_conffile;
  this->allow_cmdline=allow_cmdline;
  if (status) *status=0;
}


configuration_manager::opt_switch_t::opt_switch_t(const string & shortname, 
						  const string & longname,
						  const string & description, 
						  int * status,
						  const bool & allow_conffile,
						  const bool & allow_cmdline){
  this->shortname=shortname;
  this->longname=longname;
  this->description=description;
  this->status=status;
  this->target=target;
  this->placeholder=placeholder;
  this->allow_conffile=allow_conffile;
  this->allow_cmdline=allow_cmdline;
}


configuration_manager::cmd_arg_t::cmd_arg_t(const string & placeholder, 
					    const string & description,
					    int * status, 
					    string * target){
  this->placeholder=placeholder;
  this->description=description;
  this->status=status;
  this->target=target;
}