lyx_mirror/src/lyx_main.C

/* This file is part of
 * ======================================================
 *
 *           LyX, The Document Processor
 *
 *           Copyright 1995 Matthias Ettrich
 *           Copyright 1995-2001 The LyX Team.
 *
 * ====================================================== */

#include <config.h>
#include <version.h>

#ifdef __GNUG__
#pragma implementation
#endif

#include "lyx_main.h"
#include "lyx_gui.h"
#include "LyXView.h"
#include "lyxfunc.h"
#include "lyxrc.h"
#include "buffer.h"
#include "bufferlist.h"
#include "debug.h"
#include "lastfiles.h"
#include "intl.h"
#include "lyxserver.h"
//#include "layout.h"
#include "lyxtextclasslist.h"
#include "gettext.h"
#include "kbmap.h"
#include "MenuBackend.h"
#include "ToolbarDefaults.h"
#include "lyxlex.h"
#include "encoding.h"
#include "converter.h"
#include "language.h"

#include "frontends/Alert.h"
#include "frontends/GUIRunTime.h"

#include "support/path.h"
#include "support/filetools.h"
#include "support/FileInfo.h"
#include "support/os.h"

#include <cstdlib>
#include <csignal>

using std::endl;

#ifndef CXX_GLOBAL_CSTD
using std::exit;
using std::signal;
using std::system;
#endif

extern void LoadLyXFile(string const &);
extern void QuitLyX();

string system_lyxdir;
string build_lyxdir;
string system_tempdir;
string user_lyxdir;	// Default $HOME/.lyx

// Should this be kept global? Asger says Yes.
DebugStream lyxerr;

boost::scoped_ptr<LastFiles> lastfiles;

// This is the global bufferlist object
BufferList bufferlist;

LyXServer * lyxserver = 0;
// this should be static, but I need it in buffer.C
bool finished = false;	// flag, that we are quitting the program

// convenient to have it here.
boost::scoped_ptr<kb_keymap> toplevel_keymap;


LyX::LyX(int * argc, char * argv[])
{
	// Here we need to parse the command line. At least
	// we need to parse for "-dbg" and "-help"
	bool gui = easyParse(argc, argv);

	// Global bindings (this must be done as early as possible.) (Lgb)
	toplevel_keymap.reset(new kb_keymap);
	defaultKeyBindings(toplevel_keymap.get());

	// Make the GUI object, and let it take care of the
	// command line arguments that concerns it.
	lyxerr[Debug::INIT] << "Initializing LyXGUI..." << endl;
	lyxGUI.reset(new LyXGUI(this, argc, argv, gui));
	lyxerr[Debug::INIT] << "Initializing LyXGUI...done" << endl;

	// Now the GUI and LyX have taken care of their arguments, so
	// the only thing left on the command line should be
	// filenames. Let's check anyway.
	for (int argi = 1; argi < *argc ; ++argi) {
		if (argv[argi][0] == '-') {
			lyxerr << _("Wrong command line option `")
			       << argv[argi]
			       << _("'. Exiting.") << endl;
			exit(1);
		}
	}

	// Initialization of LyX (reads lyxrc and more)
	lyxerr[Debug::INIT] << "Initializing LyX::init..." << endl;
	init(gui);
	lyxerr[Debug::INIT] << "Initializing LyX::init...done" << endl;

	lyxGUI->init();

	// Load the files specified in the command line.
	if ((*argc) == 2)
		lyxerr[Debug::INFO] << "Opening document..." << endl;
	else if ((*argc) > 2)
		lyxerr[Debug::INFO] << "Opening documents..." << endl;

	Buffer * last_loaded = 0;

	for (int argi = (*argc) - 1; argi >= 1; --argi) {
		Buffer * loadb = bufferlist.loadLyXFile(argv[argi]);
		if (loadb != 0) {
			last_loaded = loadb;
		}
	}

	if (first_start) {
		string const splash =
			i18nLibFileSearch("examples", "splash.lyx");
		lyxerr[Debug::INIT] << "Opening splash document "
			       << splash << "..." << endl;
		Buffer * loadb = bufferlist.loadLyXFile(splash);
		if (loadb != 0) {
			last_loaded = loadb;
		}
	}

	if (last_loaded != 0) {
		lyxerr[Debug::INIT] << "Yes we loaded some files." << endl;
		if (lyxrc.use_gui)
			lyxGUI->regBuf(last_loaded);
	}

	// Execute batch commands if available
	if (!batch_command.empty()) {
		lyxerr << "About to handle -x '"
		       << batch_command << "'" << endl;

		// no buffer loaded, create one
		if (!last_loaded)
			last_loaded = bufferlist.newFile("tmpfile", string());

		bool success = false;
 
		// try to dispatch to last loaded buffer first
		bool dispatched	= last_loaded->dispatch(batch_command, &success);

		// if this was successful, return.
		// Maybe we could do something more clever than aborting...
		if (dispatched) {
			QuitLyX();
			exit(!success);
		}

		// otherwise, let the GUI handle the batch command
		lyxGUI->regBuf(last_loaded);
		lyxGUI->getLyXView()->getLyXFunc()->verboseDispatch(batch_command, false);

		// fall through...
	}

	// Let the ball begin...
	lyxGUI->runTime();
}


// A destructor is always necessary  (asierra-970604)
LyX::~LyX()
{
}


extern "C" {

static
void error_handler(int err_sig)
{
	switch (err_sig) {
	case SIGHUP:
		lyxerr << "\nlyx: SIGHUP signal caught" << endl;
		break;
	case SIGINT:
		// no comments
		break;
	case SIGFPE:
		lyxerr << "\nlyx: SIGFPE signal caught" << endl;
		break;
	case SIGSEGV:
		lyxerr << "\nlyx: SIGSEGV signal caught" << endl;
		lyxerr <<
			"Sorry, you have found a bug in LyX. "
			"Please read the bug-reporting instructions "
			"in Help->Introduction and send us a bug report, "
			"if necessary. Thanks !" << endl;
		break;
	case SIGTERM:
		// no comments
		break;
	}

	// Deinstall the signal handlers
	signal(SIGHUP, SIG_DFL);
	signal(SIGINT, SIG_DFL);
	signal(SIGFPE, SIG_DFL);
	signal(SIGSEGV, SIG_DFL);
	signal(SIGTERM, SIG_DFL);

	LyX::emergencyCleanup();

	lyxerr << "Bye." << endl;
	if (err_sig!= SIGHUP &&
	   (!GetEnv("LYXDEBUG").empty() || err_sig == SIGSEGV))
		lyx::abort();
	exit(0);
}

}


void LyX::init(bool gui)
{
	// Install the signal handlers
	signal(SIGHUP, error_handler);
	signal(SIGFPE, error_handler);
	signal(SIGSEGV, error_handler);
	signal(SIGINT, error_handler);
	signal(SIGTERM, error_handler);

	//
	// Determine path of binary
	//

	string binpath = os::binpath();
	string binname = os::binname();
	string fullbinname = MakeAbsPath(binname, binpath);

	if (binpath.empty()) {
		lyxerr << _("Warning: could not determine path of binary.")
		       << "\n"
		       << _("If you have problems, try starting LyX with an absolute path.")
		       << endl;
	}
	lyxerr[Debug::INIT] << "Name of binary: " << binname << endl;
	lyxerr[Debug::INIT] << "Path of binary: " << binpath << endl;

	//
	// Determine system directory.
	//

	// Directories are searched in this order:
	// 1) -sysdir command line parameter
	// 2) LYX_DIR_12x environment variable
	// 3) Maybe <path of binary>/TOP_SRCDIR/lib
	// 4) <path of binary>/../share/<name of binary>/
	// 4a) repeat 4 after following the Symlink if <path of
	//     binary> is a symbolic link.
	// 5) hardcoded lyx_dir
	// The directory is checked for the presence of the file
	// "chkconfig.ltx", and if that is present, the directory
	// is accepted as the system directory.
	// If no chkconfig.ltx file is found, a warning is given,
	// and the hardcoded lyx_dir is used.

	// If we had a command line switch, system_lyxdir is already set
	string searchpath;
	if (!system_lyxdir.empty())
		searchpath= MakeAbsPath(system_lyxdir) + ';';

	// LYX_DIR_12x environment variable
	string const lyxdir = GetEnvPath("LYX_DIR_12x");

	if (!lyxdir.empty()) {
		lyxerr[Debug::INIT] << "LYX_DIR_12x: " << lyxdir << endl;
		searchpath += lyxdir + ';';
	}

	string fullbinpath = binpath;
	FileInfo file(fullbinname, true);
	if (file.isLink()) {
		lyxerr[Debug::INIT] << "binary is a link" << endl;
		string link;
		if (LyXReadLink(fullbinname, link)) {
			// Path of binary/../share/name of binary/
			searchpath += NormalizePath(AddPath(binpath,
							    "../share/")
						    + OnlyFilename(binname));
			searchpath += ';';
			fullbinpath = link;
			binpath = MakeAbsPath(OnlyPath(fullbinpath));
		}
	}

	bool followlink;
	do {
		// Path of binary/../share/name of binary/
		searchpath += NormalizePath(AddPath(binpath, "../share/") +
		      OnlyFilename(binname)) + ';';

		// Follow Symlinks
		FileInfo file(fullbinpath, true);
		followlink = file.isLink();
		if (followlink) {
			lyxerr << " directory " << fullbinpath
			       << " is a link" << endl;
			string link;
			if (LyXReadLink(fullbinpath, link)) {
				fullbinpath = link;
				binpath = MakeAbsPath(OnlyPath(fullbinpath));
			}
			else {
				followlink = false;
			}
		}
	} while (followlink);

	// <path of binary>/TOP_SRCDIR/lib
	build_lyxdir = MakeAbsPath("../lib", binpath);
	if (!FileSearch(build_lyxdir, "lyxrc.defaults").empty()) {
		searchpath += MakeAbsPath(AddPath(TOP_SRCDIR, "lib"),
					  binpath) + ';';
		lyxerr[Debug::INIT] << "Checking whether LyX is run in "
			"place... yes" << endl;
	} else {
		lyxerr[Debug::INIT]
			<< "Checking whether LyX is run in place... no"
			<< endl;
		build_lyxdir.erase();
	}

	// Hardcoded dir
	searchpath += LYX_DIR;

	// If debugging, show complete search path
	lyxerr[Debug::INIT] << "System directory search path: "
			    << searchpath << endl;

	string const filename = "chkconfig.ltx";
	string const temp = FileOpenSearch(searchpath, filename, string());
	system_lyxdir = OnlyPath(temp);

	// Reduce "path/../path" stuff out of system directory
	system_lyxdir = NormalizePath(system_lyxdir);

	bool path_shown = false;

	// Warn if environment variable is set, but unusable
	if (!lyxdir.empty()) {
		if (system_lyxdir != NormalizePath(lyxdir)) {
			lyxerr <<_("LYX_DIR_12x environment variable no good.")
			       << '\n'
			       << _("System directory set to: ")
			       << system_lyxdir << endl;
			path_shown = true;
		}
	}

	// Warn the user if we couldn't find "chkconfig.ltx"
	if (system_lyxdir == "./") {
		lyxerr <<_("LyX Warning! Couldn't determine system directory. ")
		       <<_("Try the '-sysdir' command line parameter or ")
		       <<_("set the environment variable LYX_DIR_12x to the "
			   "LyX system directory ")
		       << _("containing the file `chkconfig.ltx'.") << endl;
		if (!path_shown) {
			FileInfo fi(LYX_DIR);
			if (!fi.exist()) {
				lyxerr << "Couldn't even find the default LYX_DIR." << endl
					<< "Giving up." << endl;
				exit(1);
			}
			lyxerr << _("Using built-in default ")
			       << LYX_DIR << _(" but expect problems.")
			       << endl;
		} else {
			lyxerr << _("Expect problems.") << endl;
		}
		system_lyxdir = LYX_DIR;
		path_shown = true;
	}
	// Report the system directory if debugging is on
	if (!path_shown)
		lyxerr[Debug::INIT] << "System directory: '"
				    << system_lyxdir << '\'' << endl;

	//
	// Determine user lyx-dir
	//

	// Directories are searched in this order:
	// 1) -userdir command line parameter
	// 2) LYX_USERDIR_12x environment variable
	// 3) $HOME/.<name of binary>

	// If we had a command line switch, user_lyxdir is already set
	bool explicit_userdir = true;
	if (user_lyxdir.empty()) {

		// LYX_USERDIR_12x environment variable
		user_lyxdir = GetEnvPath("LYX_USERDIR_12x");

		// default behaviour
		if (user_lyxdir.empty())
			user_lyxdir = AddPath(GetEnvPath("HOME"),
							string(".") + PACKAGE);
			explicit_userdir = false;
	}

	lyxerr[Debug::INIT] << "User LyX directory: '"
			    <<  user_lyxdir << '\'' << endl;

	// Check that user LyX directory is ok. We don't do that if
	// running in batch mode.
	if (gui) {
		queryUserLyXDir(explicit_userdir);
	} else {
		first_start = false;
	}

	//
	// Shine up lyxrc defaults
	//

	// Default template path: system_dir/templates
	if (lyxrc.template_path.empty()) {
		lyxrc.template_path = AddPath(system_lyxdir, "templates");
	}

	// Default lastfiles file: $HOME/.lyx/lastfiles
	if (lyxrc.lastfiles.empty()) {
		lyxrc.lastfiles = AddName(user_lyxdir, "lastfiles");
	}

	// Disable gui when either lyxrc or easyparse says so
	if (!gui)
		lyxrc.use_gui = false;

	// Calculate screen dpi as average of x-DPI and y-DPI:
	if (lyxrc.use_gui) {
		lyxrc.dpi = GUIRunTime::getScreenDPI();
		lyxerr[Debug::INIT] << "DPI setting detected to be "
						<< lyxrc.dpi + 0.5 << endl;
	} else {
		lyxrc.dpi = 1; // I hope this is safe
	}

	//
	// Read configuration files
	//

	readRcFile("lyxrc.defaults");
	system_lyxrc = lyxrc;
	system_formats = formats;
	system_converters = converters;
	system_lcolor = lcolor;

	// If there is a preferences file we read that instead
	// of the old lyxrc file.
	if (!readRcFile("preferences"))
	    readRcFile("lyxrc");

	// Read encodings
	readEncodingsFile("encodings");
	// Read languages
	readLanguagesFile("languages");

	// Load the layouts
	lyxerr[Debug::INIT] << "Reading layouts..." << endl;
	LyXSetStyle();

	// Ensure that we have really read a bind file, so that LyX is
	// usable.
	lyxrc.readBindFileIfNeeded();

	// Read menus
	readUIFile(lyxrc.ui_file);

	// Bind the X dead keys to the corresponding LyX functions if
	// necessary.
	if (lyxrc.override_x_deadkeys)
		deadKeyBindings(toplevel_keymap.get());

	if (lyxerr.debugging(Debug::LYXRC)) {
		lyxrc.print();
	}

	// Create temp directory
	os::setTmpDir(CreateLyXTmpDir(lyxrc.tempdir_path));
	system_tempdir = os::getTmpDir();
	if (lyxerr.debugging(Debug::INIT)) {
		lyxerr << "LyX tmp dir: `" << system_tempdir << '\'' << endl;
	}

	// load the lastfiles mini-database
	lyxerr[Debug::INIT] << "Reading lastfiles `"
			    << lyxrc.lastfiles << "'..." << endl;
	lastfiles.reset(new LastFiles(lyxrc.lastfiles,
				      lyxrc.check_lastfiles,
				      lyxrc.num_lastfiles));

	// start up the lyxserver. (is this a bit early?) (Lgb)
	// 0.12 this will be way to early, we need the GUI to be initialized
	// first, so move it for now.
	// lyxserver = new LyXServer;
}


// These are the default bindings known to LyX
void LyX::defaultKeyBindings(kb_keymap  * kbmap)
{
	kbmap->bind("Right", LFUN_RIGHT);
	kbmap->bind("Left", LFUN_LEFT);
	kbmap->bind("Up", LFUN_UP);
	kbmap->bind("Down", LFUN_DOWN);

	kbmap->bind("Tab", LFUN_TAB);
	kbmap->bind("ISO_Left_Tab", LFUN_TAB); // jbl 2001-23-02

	kbmap->bind("Home", LFUN_HOME);
	kbmap->bind("End", LFUN_END);
	kbmap->bind("Prior", LFUN_PRIOR);
	kbmap->bind("Next", LFUN_NEXT);

	kbmap->bind("Return", LFUN_BREAKPARAGRAPH);
	//kbmap->bind("~C-~S-~M-nobreakspace", LFUN_PROTECTEDSPACE);

	kbmap->bind("Delete", LFUN_DELETE);
	kbmap->bind("BackSpace", LFUN_BACKSPACE);

	// sub- and superscript -MV
	kbmap->bind("~S-underscore", LFUN_SUBSCRIPT);
	kbmap->bind("~S-asciicircum", LFUN_SUPERSCRIPT);

	// kbmap->bindings to enable the use of the numeric keypad
	// e.g. Num Lock set
	//kbmap->bind("KP_0", LFUN_SELFINSERT);
	//kbmap->bind("KP_Decimal", LFUN_SELFINSERT);
	kbmap->bind("KP_Enter", LFUN_BREAKPARAGRAPH);
	//kbmap->bind("KP_1", LFUN_SELFINSERT);
	//kbmap->bind("KP_2", LFUN_SELFINSERT);
	//kbmap->bind("KP_3", LFUN_SELFINSERT);
	//kbmap->bind("KP_4", LFUN_SELFINSERT);
	//kbmap->bind("KP_5", LFUN_SELFINSERT);
	//kbmap->bind("KP_6", LFUN_SELFINSERT);
	//kbmap->bind("KP_Add", LFUN_SELFINSERT);
	//kbmap->bind("KP_7", LFUN_SELFINSERT);
	//kbmap->bind("KP_8", LFUN_SELFINSERT);
	//kbmap->bind("KP_9", LFUN_SELFINSERT);
	//kbmap->bind("KP_Divide", LFUN_SELFINSERT);
	//kbmap->bind("KP_Multiply", LFUN_SELFINSERT);
	//kbmap->bind("KP_Subtract", LFUN_SELFINSERT);
	kbmap->bind("KP_Right", LFUN_RIGHT);
	kbmap->bind("KP_Left", LFUN_LEFT);
	kbmap->bind("KP_Up", LFUN_UP);
	kbmap->bind("KP_Down", LFUN_DOWN);
	kbmap->bind("KP_Home", LFUN_HOME);
	kbmap->bind("KP_End", LFUN_END);
	kbmap->bind("KP_Prior", LFUN_PRIOR);
	kbmap->bind("KP_Next", LFUN_NEXT);

	kbmap->bind("C-Tab", LFUN_TABINSERT);  // ale970515
	kbmap->bind("S-Tab", LFUN_SHIFT_TAB);  // jug20000522
	kbmap->bind("S-ISO_Left_Tab", LFUN_SHIFT_TAB); // jbl 2001-23-02
}


void LyX::emergencyCleanup()
{
	// what to do about tmpfiles is non-obvious. we would
	// like to delete any we find, but our lyxdir might
	// contain documents etc. which might be helpful on
	// a crash

	bufferlist.emergencyWriteAll();
	if (lyxserver)
		lyxserver->emergencyCleanup();
}


// LyX can optionally take over the handling of deadkeys
void LyX::deadKeyBindings(kb_keymap * kbmap)
{
	// bindKeyings for transparent handling of deadkeys
	// The keysyms are gotten from XFree86 X11R6
	kbmap->bind("~C-~S-~M-dead_acute", LFUN_ACUTE);
	kbmap->bind("~C-~S-~M-dead_breve", LFUN_BREVE);
	kbmap->bind("~C-~S-~M-dead_caron", LFUN_CARON);
	kbmap->bind("~C-~S-~M-dead_cedilla", LFUN_CEDILLA);
	kbmap->bind("~C-~S-~M-dead_abovering", LFUN_CIRCLE);
	kbmap->bind("~C-~S-~M-dead_circumflex", LFUN_CIRCUMFLEX);
	kbmap->bind("~C-~S-~M-dead_abovedot", LFUN_DOT);
	kbmap->bind("~C-~S-~M-dead_grave", LFUN_GRAVE);
	kbmap->bind("~C-~S-~M-dead_doubleacute", LFUN_HUNG_UMLAUT);
	kbmap->bind("~C-~S-~M-dead_macron", LFUN_MACRON);
	// nothing with this name
	// kbmap->bind("~C-~S-~M-dead_special_caron", LFUN_SPECIAL_CARON);
	kbmap->bind("~C-~S-~M-dead_tilde", LFUN_TILDE);
	kbmap->bind("~C-~S-~M-dead_diaeresis", LFUN_UMLAUT);
	// nothing with this name either...
	//kbmap->bind("~C-~S-~M-dead_underbar", LFUN_UNDERBAR);
	kbmap->bind("~C-~S-~M-dead_belowdot", LFUN_UNDERDOT);
	kbmap->bind("~C-~S-~M-dead_tie", LFUN_TIE);
	kbmap->bind("~C-~S-~M-dead_ogonek", LFUN_OGONEK);
}


// This one is not allowed to use anything on the main form, since that
// one does not exist yet. (Asger)
void LyX::queryUserLyXDir(bool explicit_userdir)
{
	// Does user directory exist?
	FileInfo fileInfo(user_lyxdir);
	if (fileInfo.isOK() && fileInfo.isDir()) {
		first_start = false;
		return;
	} else {
		first_start = !explicit_userdir;
	}

	// If the user specified explicitely a directory, ask whether
	// to create it (otherwise, always create it)
	if (explicit_userdir &&
	    !Alert::askQuestion(_("You have specified an invalid LyX directory."),
			 _("It is needed to keep your own configuration."),
			 _("Should I try to set it up for you (recommended)?"))) {
		lyxerr << _("Running without personal LyX directory.") << endl;
		// No, let's use $HOME instead.
		user_lyxdir = GetEnvPath("HOME");
		return;
	}

	// Tell the user what is going on
	lyxerr << _("LyX: Creating directory ") << user_lyxdir
	       << _(" and running configure...") << endl;

	// Create directory structure
	if (!createDirectory(user_lyxdir, 0755)) {
		// Failed, let's use $HOME instead.
		user_lyxdir = GetEnvPath("HOME");
		lyxerr << _("Failed. Will use ") << user_lyxdir
		       << _(" instead.") << endl;
		return;
	}

	// Run configure in user lyx directory
	Path p(user_lyxdir);
	::system(AddName(system_lyxdir, "configure").c_str());
	lyxerr << "LyX: " << _("Done!") << endl;
}


// Read the rc file `name'
bool LyX::readRcFile(string const & name)
{
	lyxerr[Debug::INIT] << "About to read " << name << "..." << endl;

	string const lyxrc_path = LibFileSearch(string(), name);
	if (!lyxrc_path.empty()) {
		lyxerr[Debug::INIT] << "Found " << name
				    << " in " << lyxrc_path << endl;
		if (lyxrc.read(lyxrc_path) < 0) {
			Alert::alert(_("LyX Warning!"),
				   _("Error while reading ") + lyxrc_path + ".",
				   _("Using built-in defaults."));
			return false;
		}
		return true;
	} else {
		lyxerr[Debug::INIT] << "Could not find " << name << endl;
	}

	return false;
}


// Read the ui file `name'
void LyX::readUIFile(string const & name)
{
	enum Uitags {
		ui_menuset = 1,
		ui_toolbar,
		ui_last
	};

	struct keyword_item uitags[ui_last-1] = {
		{ "menuset", ui_menuset },
		{ "toolbar", ui_toolbar }
	};

	lyxerr[Debug::INIT] << "About to read " << name << "..." << endl;

	string const ui_path = LibFileSearch("ui", name, "ui");

	if (ui_path.empty()) {
		lyxerr[Debug::INIT] << "Could not find " << name << endl;
		menubackend.defaults();
		return;
	}

	lyxerr[Debug::INIT] << "Found " << name
			    << " in " << ui_path << endl;
	LyXLex lex(uitags, ui_last - 1);
	lex.setFile(ui_path);
	if (!lex.isOK()) {
		lyxerr << "Unable to set LyXLeX for ui file: " << ui_path
		       << endl;
	}

	if (lyxerr.debugging(Debug::PARSER))
		lex.printTable(lyxerr);

	while (lex.isOK()) {
		switch (lex.lex()) {
		case ui_menuset:
			menubackend.read(lex);
			break;

		case ui_toolbar:
			toolbardefaults.read(lex);
			break;

		default:
			if (!strip(lex.getString()).empty())
				lex.printError("LyX::ReadUIFile: "
					       "Unknown menu tag: `$$Token'");
			break;
		}
	}
}


// Read the languages file `name'
void LyX::readLanguagesFile(string const & name)
{
	lyxerr[Debug::INIT] << "About to read " << name << "..." << endl;

	string const lang_path = LibFileSearch(string(), name);
	if (lang_path.empty()) {
		lyxerr[Debug::INIT] << "Could not find " << name << endl;
		languages.setDefaults();
		return;
	}
	languages.read(lang_path);
}


// Read the encodings file `name'
void LyX::readEncodingsFile(string const & name)
{
	lyxerr[Debug::INIT] << "About to read " << name << "..." << endl;

	string const enc_path = LibFileSearch(string(), name);
	if (enc_path.empty()) {
		lyxerr[Debug::INIT] << "Could not find " << name << endl;
		return;
	}
	encodings.read(enc_path);
}


namespace {

// Set debugging level and report result to user
void setDebuggingLevel(string const & dbgLevel)
{
	lyxerr << _("Setting debug level to ") <<  dbgLevel << endl;
	lyxerr.level(Debug::value(dbgLevel));
	Debug::showLevel(lyxerr, lyxerr.level());
}


// Give command line help
void commandLineHelp()
{
	lyxerr <<
		_("Usage: lyx [ command line switches ] [ name.lyx ... ]\n"
		  "Command line switches (case sensitive):\n"
		  "\t-help              summarize LyX usage\n"
		  "\t-userdir dir       try to set user directory to dir\n"
		  "\t-sysdir dir        try to set system directory to dir\n"
		  "\t-geometry WxH+X+Y  set geometry of the main window\n"
		  "\t-dbg feature[,feature]...\n"
		  "                  select the features to debug.\n"
		  "                  Type `lyx -dbg' to see the list of features\n"
		  "\t-x [--execute] command\n"
		  "                  where command is a lyx command.\n"
		  "\t-e [--export] fmt\n"
		  "                  where fmt is the export format of choice.\n"
		  "\t-i [--import] fmt file.xxx\n"
		  "                  where fmt is the import format of choice\n"
		  "                  and file.xxx is the file to be imported.\n"
		  "\t-version        summarize version and build info\n"
		  "Check the LyX man page for more details.") << endl;
}

// Give command line version information
void commandLineVersionInfo()
{
	lyxerr << "LyX " << lyx_version
	       << " of " << lyx_release_date << endl;
	lyxerr << "Built on " << __DATE__ << ", " << __TIME__ << endl;

	lyxerr << lyx_version_info << endl;
}


} // namespace anon


bool LyX::easyParse(int * argc, char * argv[])
{
	bool gui = true;
	int removeargs = 0; // used when options are read
	for (int i = 1; i < *argc; ++i) {
		string arg = argv[i];

		// Check for -dbg int
		if (arg == "-dbg") {
			if (i + 1 < *argc) {
				setDebuggingLevel(argv[i + 1]);
				removeargs = 2;
			} else {
				lyxerr << _("List of supported debug flags:")
				       << endl;
				Debug::showTags(lyxerr);
				exit(1);
			}
		}
		// Check for "-sysdir"
		else if (arg == "-sysdir") {
			if (i + 1 < *argc) {
				system_lyxdir = argv[i + 1];
				removeargs = 2;
			} else {
				lyxerr << _("Missing directory for -sysdir switch!")
				       << endl;
				exit(1);
			}
		}
		// Check for "-userdir"
		else if (arg == "-userdir") {
			if (i + 1 < *argc) {
				user_lyxdir = argv[i + 1];
				removeargs = 2;
			} else {
				lyxerr << _("Missing directory for -userdir switch!")
				       << endl;
				exit(1);
			}
		}
		// Check for --help or -help
		else if (arg == "--help" || arg == "-help") {
			commandLineHelp();
			exit(0);
		}
		// Check for --version or -version
		else if (arg == "--version" || arg == "-version") {
			commandLineVersionInfo();
			exit(0);
		}
		// FIXME: why is this commented out ? 
		// Check for "-nw": No XWindows as for emacs this should
		// give a LyX that could be used in a terminal window.
		//else if (arg == "-nw") {
		//	gui = false;
		//}

		// Check for "-x": Execute commands
		else if (arg == "-x" || arg == "--execute") {
			if (i + 1 < *argc) {
				batch_command = string(argv[i + 1]);
				removeargs = 2;
			}
			else
				lyxerr << _("Missing command string after  -x switch!") << endl;

			// Argh. Setting gui to false segfaults..
			// FIXME: when ? how ? 
			// gui = false;
		}

		else if (arg == "-e" || arg == "--export") {
			if (i + 1 < *argc) {
				string type(argv[i+1]);
				removeargs = 2;
				batch_command = "buffer-export " + type;
				gui = false;
			} else {
				lyxerr << _("Missing file type [eg latex, "
					    "ps...] after ")
				       << arg << _(" switch!") << endl;
				exit(1);
			}
		}
		else if (arg == "-i" || arg == "--import") {
			if (i + 1 < *argc) {
				if (!argv[i+2]) {
					lyxerr << _("Missing filename for --import") << endl;
					exit(1);
				}
 
				string const file(argv[i+2]);
				string const type(argv[i+1]);
				removeargs = 3;
 
				batch_command = "buffer-import " + type + " " + file;
				lyxerr << "batch_command: "
				       << batch_command << endl;

			} else {
				lyxerr << _("Missing type [eg latex, "
					    "ps...] after ")
				       << arg << _(" switch!") << endl;
				exit(1);
			}
		}

		if (removeargs > 0) {
			// Now, remove used arguments by shifting
			// the following ones removeargs places down.
			(*argc) -= removeargs;
			for (int j = i; j < (*argc); ++j)
				argv[j] = argv[j + removeargs];
			--i; // After shift, check this number again.
			removeargs = 0;
		}

	}

	return gui;
}