X-Git-Url: http://git.tdb.fi/?p=libs%2Fcore.git;a=blobdiff_plain;f=source%2Fcore%2Fgetopt.cpp;h=911b673d9b1d28358966a302de44aaf6428735e3;hp=b8e24132b7718ad39f5e3ed63abff7635d1d260c;hb=736d15fbdee0ea47b38a4d5fcd321e86eb21b465;hpb=cfc8e0b7b15ea505bd6a6a9599cbc5ce1e316963

diff --git a/source/core/getopt.cpp b/source/core/getopt.cpp
index b8e2413..911b673 100644
--- a/source/core/getopt.cpp
+++ b/source/core/getopt.cpp
@@ -1,158 +1,100 @@
-/* $Id$
-
-This file is part of libmspcore
-Copyright © 2006-2007 Mikko Rasa, Mikkosoft Productions
-Distributed under the LGPL
-*/
+#include <msp/strings/format.h>
 #include "getopt.h"
 
 using namespace std;
 
 namespace Msp {
 
+GetOpt::GetOpt():
+	help(false)
+{
+	add_option("help", help, NO_ARG).set_help("Displays this help");
+}
+
 GetOpt::~GetOpt()
 {
 	for(list<OptBase *>::iterator i=opts.begin(); i!=opts.end(); ++i)
 		delete *i;
 }
 
-/**
-Generates a single line that gives an overview about the known options.
-
-@param   argv0  The program name to be used in the usage string
-
-@return  The generated usage string
-*/
-string GetOpt::generate_usage(const string &argv0) const
+GetOpt::OptBase &GetOpt::add_option(OptBase *opt)
 {
-	ostringstream line;
-	
-	line<<argv0;
-	for(list<OptBase *>::const_iterator i=opts.begin(); i!=opts.end(); ++i)
+	for(list<OptBase *>::iterator i=opts.begin(); i!=opts.end(); )
 	{
-		line<<" [";
-		if((*i)->get_short())
-		{
-			line<<'-'<<(*i)->get_short();
-			if(!(*i)->get_long().empty())
-				line<<'|';
-			else if((*i)->get_arg_type()==OPTIONAL_ARG)
-				line<<"[ARG]";
-			else if((*i)->get_arg_type()==REQUIRED_ARG)
-				line<<" ARG";
-		}
-		if(!(*i)->get_long().empty())
+		if((*i)->get_short()==opt->get_short() || (*i)->get_long()==opt->get_long())
 		{
-			line<<"--"<<(*i)->get_long();
-
-			if((*i)->get_arg_type()==OPTIONAL_ARG)
-				line<<"[=ARG]";
-			else if((*i)->get_arg_type()==REQUIRED_ARG)
-				line<<"=ARG";
+			delete *i;
+			opts.erase(i++);
 		}
-		line<<']';
+		else
+			++i;
 	}
 
-	return line.str();
+	opts.push_back(opt);
+	return *opts.back();
 }
 
-/**
-Generates help for known options in tabular format, one option per line.
-The returned string will have a linefeed at the end.
-*/
-string GetOpt::generate_help() const
+GetOpt::OptBase &GetOpt::get_option(char s)
 {
-	string result;
-	for(list<OptBase *>::const_iterator i=opts.begin(); i!=opts.end(); ++i)
-	{
-		ostringstream line;
-		line<<"  ";
-		if((*i)->get_short())
-		{
-			line<<'-'<<(*i)->get_short();
-			if(!(*i)->get_long().empty())
-				line<<", ";
-			else if((*i)->get_arg_type()==OPTIONAL_ARG)
-				line<<"[ARG]";
-			else if((*i)->get_arg_type()==REQUIRED_ARG)
-				line<<" ARG";
-		}
-		if(!(*i)->get_long().empty())
-		{
-			line<<"--"<<(*i)->get_long();
-
-			if((*i)->get_arg_type()==OPTIONAL_ARG)
-				line<<"[=ARG]";
-			else if((*i)->get_arg_type()==REQUIRED_ARG)
-				line<<"=ARG";
-		}
-
-		line<<"  "<<(*i)->get_help()<<'\n';
+	for(list<OptBase *>::iterator i=opts.begin(); i!=opts.end(); ++i)
+		if((*i)->get_short()==s)
+			return **i;
+	throw usage_error(string("Unknown option -")+s);
+}
 
-		result+=line.str();
-	}
-	
-	return result;
+GetOpt::OptBase &GetOpt::get_option(const string &l)
+{
+	for(list<OptBase *>::iterator i=opts.begin(); i!=opts.end(); ++i)
+		if((*i)->get_long()==l)
+			return **i;
+	throw usage_error(string("Unknown option --")+l);
 }
 
 void GetOpt::operator()(unsigned argc, const char *const *argv)
 {
-	unsigned i=1;
-	for(; i<argc;)
+	try
 	{
-		if(argv[i][0]=='-')
+		unsigned i = 1;
+		for(; i<argc;)
 		{
-			if(argv[i][1]=='-')
+			if(argv[i][0]=='-')
 			{
-				if(!argv[i][2])
-					break;
+				if(argv[i][1]=='-')
+				{
+					if(!argv[i][2])
+						break;
 
-				i+=process_long(argv+i);
+					i += process_long(argv+i);
+				}
+				else
+					i += process_short(argv+i);
 			}
 			else
-				i+=process_short(argv+i);
+				args.push_back(argv[i++]);
 		}
-		else
-			args.push_back(argv[i++]);
+		
+		for(; i<argc; ++i)
+			args.push_back(argv[i]);
+	}
+	catch(const usage_error &e)
+	{
+		throw usage_error(e.what(), "Usage: "+generate_usage(argv[0]));
 	}
-	
-	for(; i<argc; ++i)
-		args.push_back(argv[i]);
-}
-
-GetOpt::OptBase &GetOpt::get_option(char s)
-{
-	for(list<OptBase *>::iterator i=opts.begin(); i!=opts.end(); ++i)
-		if((*i)->get_short()==s)
-			return **i;
-	throw UsageError(string("Unknown option -")+s);
-}
 
-GetOpt::OptBase &GetOpt::get_option(const string &l)
-{
-	for(list<OptBase *>::iterator i=opts.begin(); i!=opts.end(); ++i)
-		if((*i)->get_long()==l)
-			return **i;
-	throw UsageError(string("Unknown option --")+l);
+	if(help)
+		throw usage_error(string("Help for ")+argv[0]+":", generate_help());
 }
 
-/**
-Processes the given argument as a long option.
-
-@param   argp  Pointer to the argument
-
-@return  The number of arguments eaten (1 or 2)
-*/
 unsigned GetOpt::process_long(const char *const *argp)
 {
 	// Skip the --
-	const char *arg=argp[0]+2;
+	const char *arg = argp[0]+2;
 
 	// See if the argument contains an =
-	unsigned equals=0;
+	unsigned equals = 0;
 	for(; arg[equals] && arg[equals]!='='; ++equals) ;
 	
-	OptBase &opt=get_option(string(arg, equals));
+	OptBase &opt = get_option(string(arg, equals));
 	
 	if(arg[equals])
 		// Process the part after the = as option argument
@@ -160,7 +102,7 @@ unsigned GetOpt::process_long(const char *const *argp)
 	else if(opt.get_arg_type()==REQUIRED_ARG)
 	{
 		if(!argp[1])
-			throw UsageError("Premature end of arguments");
+			throw usage_error("--"+string(arg)+" requires an argument");
 
 		// Process the next argument as option argument
 		opt.process(argp[1]);
@@ -172,22 +114,15 @@ unsigned GetOpt::process_long(const char *const *argp)
 	return 1;
 }
 
-/**
-Processes short options from the given argument.
-
-@param   argp  Pointer to the argument
-
-@return  The number of arguments eaten (1 or 2)
-*/
 unsigned GetOpt::process_short(const char *const *argp)
 {
 	// Skip the -
-	const char *arg=argp[0]+1;
+	const char *arg = argp[0]+1;
 
 	// Loop through all characters in the argument
 	for(; *arg; ++arg)
 	{
-		OptBase &opt=get_option(*arg);
+		OptBase &opt = get_option(*arg);
 
 		if(arg[1] && opt.get_arg_type()!=NO_ARG)
 		{
@@ -198,7 +133,7 @@ unsigned GetOpt::process_short(const char *const *argp)
 		else if(opt.get_arg_type()==REQUIRED_ARG)
 		{
 			if(!argp[1])
-				throw UsageError("Premature end of arguments");
+				throw usage_error("-"+string(1, *arg)+" requires an argument");
 			
 			// Use the next argument as option argument
 			opt.process(argp[1]);
@@ -211,4 +146,122 @@ unsigned GetOpt::process_short(const char *const *argp)
 	return 1;
 }
 
+string GetOpt::generate_usage(const string &argv0) const
+{
+	string result = argv0;
+	for(list<OptBase *>::const_iterator i=opts.begin(); i!=opts.end(); ++i)
+	{
+		result += " [";
+		if((*i)->get_short())
+		{
+			result += format("-%c", (*i)->get_short());
+			if(!(*i)->get_long().empty())
+				result += '|';
+			else if((*i)->get_arg_type()==OPTIONAL_ARG)
+				result += format("[%s]", (*i)->get_metavar());
+			else if((*i)->get_arg_type()==REQUIRED_ARG)
+				result += format(" %s", (*i)->get_metavar());
+		}
+		if(!(*i)->get_long().empty())
+		{
+			result += format("--%s", (*i)->get_long());
+
+			if((*i)->get_arg_type()==OPTIONAL_ARG)
+				result += format("[=%s]", (*i)->get_metavar());
+			else if((*i)->get_arg_type()==REQUIRED_ARG)
+				result += format("=%s", (*i)->get_metavar());
+		}
+		result += ']';
+	}
+
+	return result;
+}
+
+string GetOpt::generate_help() const
+{
+	bool any_short = false;
+	for(list<OptBase *>::const_iterator i=opts.begin(); (!any_short && i!=opts.end()); ++i)
+		any_short = (*i)->get_short();
+
+	string::size_type maxw = 0;
+	list<string> switches;
+	for(list<OptBase *>::const_iterator i=opts.begin(); i!=opts.end(); ++i)
+	{
+		string swtch;
+		if((*i)->get_short())
+		{
+			swtch += format("-%c", (*i)->get_short());
+			if(!(*i)->get_long().empty())
+				swtch += ", ";
+			else if((*i)->get_arg_type()==OPTIONAL_ARG)
+				swtch += format("[%s]", (*i)->get_metavar());
+			else if((*i)->get_arg_type()==REQUIRED_ARG)
+				swtch += format(" %s", (*i)->get_metavar());
+		}
+		else if(any_short)
+			swtch += "    ";
+		if(!(*i)->get_long().empty())
+		{
+			swtch += format("--%s", (*i)->get_long());
+
+			if((*i)->get_arg_type()==OPTIONAL_ARG)
+				swtch += format("[=%s]", (*i)->get_metavar());
+			else if((*i)->get_arg_type()==REQUIRED_ARG)
+				swtch += format("=%s", (*i)->get_metavar());
+		}
+		switches.push_back(swtch);
+		maxw = max(maxw, swtch.size());
+	}
+
+	string result;
+	list<string>::const_iterator j = switches.begin();
+	for(list<OptBase *>::const_iterator i=opts.begin(); i!=opts.end(); ++i, ++j)
+		result += format("  %s%s%s\n", *j, string(maxw+2-j->size(), ' '), (*i)->get_help());
+	
+	return result;
+}
+
+
+GetOpt::OptBase::OptBase(char s, const std::string &l, ArgType a):
+	shrt(s),
+	lng(l),
+	arg_type(a),
+	seen_count(0),
+	metavar("ARG")
+{
+	if(lng.empty())
+		throw invalid_argument("empty long option name");
+}
+
+GetOpt::OptBase &GetOpt::OptBase::set_help(const string &h)
+{
+	help = h;
+	return *this;
+}
+
+GetOpt::OptBase &GetOpt::OptBase::set_help(const string &h, const string &m)
+{
+	help = h;
+	metavar = m;
+	return *this;
+}
+
+void GetOpt::OptBase::process()
+{
+	if(arg_type==REQUIRED_ARG)
+		throw usage_error("--"+lng+" requires an argument");
+	++seen_count;
+
+	store();
+}
+
+void GetOpt::OptBase::process(const string &arg)
+{
+	if(arg_type==NO_ARG)
+		throw usage_error("--"+lng+" takes no argument");
+	++seen_count;
+
+	store(arg);
+}
+
 } // namespace Msp