convert.cc

/* convert.cc - Convert documents using LibreOfficeKit
 *
 * Copyright (C) 2014,2015,2016,2018 Olly Betts
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */

#include "convert.h"

#include <cstdlib>
#include <exception>
#include <iostream>

#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <sysexits.h>

#include <LibreOfficeKit/LibreOfficeKit.hxx>

#include "urlencode.h"

using namespace std;
using namespace lok;

// Install location for Debian packages:
#define LO_PATH_DEBIAN "/usr/lib/libreoffice/program"

// Install location for .deb files from libreoffice.org:
#define LO_PATH_LIBREOFFICEORG(V) "/opt/libreoffice"#V"/program"

const char * program = "<program>";

// Find a LibreOffice installation to use.
static const char *
get_lo_path()
{
    const char * lo_path = getenv("LO_PATH");
    if (!lo_path) {
	struct stat sb;
#define CHECK_DIR(P) if (!lo_path && stat(P"/versionrc", &sb) == 0 && S_ISREG(sb.st_mode)) lo_path = P
	CHECK_DIR(LO_PATH_DEBIAN);
	CHECK_DIR(LO_PATH_LIBREOFFICEORG(6.1));
	CHECK_DIR(LO_PATH_LIBREOFFICEORG(6.0));
	CHECK_DIR(LO_PATH_LIBREOFFICEORG(5.4));
	CHECK_DIR(LO_PATH_LIBREOFFICEORG(5.3));
	CHECK_DIR(LO_PATH_LIBREOFFICEORG(5.2));
	CHECK_DIR(LO_PATH_LIBREOFFICEORG(5.1));
	CHECK_DIR(LO_PATH_LIBREOFFICEORG(5.0));
	CHECK_DIR(LO_PATH_LIBREOFFICEORG(4.4));
	CHECK_DIR(LO_PATH_LIBREOFFICEORG(4.3));

	if (!lo_path) {
	    cerr << program << ": LibreOffice install not found\n"
		"Set LO_PATH in the environment to the 'program' directory - e.g.:\n"
		"LO_PATH=/opt/libreoffice/program\n"
		"export LO_PATH" << endl;
	    _Exit(1);
	}
    }
    return lo_path;
}

void *
convert_init()
{
    Office * llo = NULL;
    try {
	const char * lo_path = get_lo_path();
	llo = lok_cpp_init(lo_path);
	if (!llo) {
	    cerr << program << ": Failed to initialise LibreOfficeKit" << endl;
	    return NULL;
	}
	return static_cast<void*>(llo);
    } catch (const exception & e) {
	delete llo;
	cerr << program << ": LibreOfficeKit threw exception (" << e.what() << ")" << endl;
	return NULL;
    }
}

void
convert_cleanup(void * h_void)
{
    Office * llo = static_cast<Office *>(h_void);
    delete llo;
}

int
convert(void * h_void, bool url,
	const char * input, const char * output,
	const char * format, const char * options)
try {
    if (!h_void) return 1;
    Office * llo = static_cast<Office *>(h_void);

    string input_url;
    if (url) {
	input_url = input;
    } else {
	url_encode_path(input_url, input);
    }
    Document * lodoc = llo->documentLoad(input_url.c_str(), options);
    if (!lodoc) {
	const char * errmsg = llo->getError();
	cerr << program << ": LibreOfficeKit failed to load document (" << errmsg << ")" << endl;
	return 1;
    }

    string output_url;
    url_encode_path(output_url, output);
    if (!lodoc->saveAs(output_url.c_str(), format, options)) {
	const char * errmsg = llo->getError();
	cerr << program << ": LibreOfficeKit failed to export (" << errmsg << ")" << endl;
	delete lodoc;
	return 1;
    }

    delete lodoc;

    return 0;
} catch (const exception & e) {
    cerr << program << ": LibreOfficeKit threw exception (" << e.what() << ")" << endl;
    return 1;
}