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+/*************************************************************************
+** MetafontWrapper.cpp **
+** **
+** This file is part of dvisvgm -- a fast DVI to SVG converter **
+** Copyright (C) 2005-2019 Martin Gieseking <martin.gieseking@uos.de> **
+** **
+** This program is free software; you can redistribute it and/or **
+** modify it under the terms of the GNU General Public License as **
+** published by the Free Software Foundation; either version 3 of **
+** the License, or (at your option) any later version. **
+** **
+** This program is distributed in the hope that it will be useful, but **
+** WITHOUT ANY WARRANTY; without even the implied warranty of **
+** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the **
+** GNU General Public License for more details. **
+** **
+** You should have received a copy of the GNU General Public License **
+** along with this program; if not, see <http://www.gnu.org/licenses/>. **
+*************************************************************************/
+
+#include <cstdlib>
+#include <cctype>
+#include <fstream>
+#include <sstream>
+#include "FileSystem.hpp"
+#include "FileFinder.hpp"
+#include "Message.hpp"
+#include "MetafontWrapper.hpp"
+#include "Process.hpp"
+#include "XMLString.hpp"
+
+using namespace std;
+
+
+MetafontWrapper::MetafontWrapper (string fname, string dir)
+ : _fontname(std::move(fname)), _dir(std::move(dir))
+{
+ // ensure that folder paths ends with slash
+ if (_dir.empty())
+ _dir = "./";
+ else if (_dir != "/" && dir[dir.length()-1] != '/')
+ _dir += '/';
+}
+
+
+/** Calls Metafont and evaluates the logfile. If a gf file was successfully
+ * generated the dpi value is stripped from the filename
+ * (e.g. cmr10.600gf => cmr10.gf). This makes life easier...
+ * @param[in] mode Metafont mode, e.g. "ljfour"
+ * @param[in] mag magnification factor
+ * @return true on success */
+bool MetafontWrapper::call (const string &mode, double mag) {
+ if (!FileFinder::instance().lookup(_fontname+".mf"))
+ return false; // mf file not available => no need to call the "slow" Metafont
+ FileSystem::remove(_fontname+".gf");
+
+#ifdef _WIN32
+#ifdef TEXLIVEWIN32
+ const char *mfname = "mf-nowin.exe";
+#else
+ const char *mfname = "mf.exe";
+#endif
+ const char *cmd = FileFinder::instance().lookup(mfname, false);
+ if (!cmd) {
+ Message::estream(true) << "can't run Metafont (" << mfname << " not found)\n";
+ return false;
+ }
+#else
+ const char *cmd = "mf";
+#endif
+ ostringstream oss;
+ oss << "\"\\mode=" << mode << ";" // set MF mode, e.g. 'proof', 'ljfour' or 'localfont'
+ "mode_setup;" // initialize MF variables
+ "mag:=" << mag << ";" // set magnification factor
+ "show pixels_per_inch*mag;" // print character resolution to stdout
+ "batchmode;" // don't halt on errors and don't print informational messages
+ "input " << _fontname << "\""; // load font description
+ Message::mstream(false, Message::MC_STATE) << "\nrunning Metafont for " << _fontname << '\n';
+ Process mf_process(cmd, oss.str());
+ string mf_messages;
+ mf_process.run(_dir, &mf_messages);
+
+ // get resolution value from stdout created by above MF command
+ char buf[256];
+ istringstream iss(mf_messages);
+ int resolution = 0;
+ while (iss) {
+ iss.getline(buf, sizeof(buf));
+ string line = buf;
+ if (line.substr(0, 3) == ">> ") {
+ resolution = atoi(line.substr(3).c_str());
+ break;
+ }
+ }
+ // compose expected name of GF file (see Metafont Book, p. 324)
+ string gfname = _dir + _fontname + ".";
+ if (resolution > 0)
+ gfname += XMLString(resolution);
+ gfname += "gf";
+ FileSystem::rename(gfname, _dir+_fontname+".gf"); // remove resolution value from filename
+ return FileSystem::exists(_dir+_fontname+".gf");
+}
+
+
+/** Calls Metafont if output files (tfm and gf) don't already exist.
+ * @param[in] mode Metafont mode to be used (e.g. 'ljfour')
+ * @param[in] mag magnification factor
+ * @return true on success */
+bool MetafontWrapper::make (const string &mode, double mag) {
+ ifstream tfm(_dir+_fontname+".tfm");
+ ifstream gf(_dir+_fontname+".gf");
+ if (gf && tfm) // @@ distinguish between gf and tfm
+ return true;
+ return call(mode, mag);
+}
+
+
+bool MetafontWrapper::success () const {
+ ifstream tfm(_dir+_fontname+".tfm");
+ ifstream gf(_dir+_fontname+".gf");
+ return tfm && gf;
+}