From 6121b486e168334db70cbbe7a67afe56c0272748 Mon Sep 17 00:00:00 2001
From: Aleks Kissinger <aleks0@gmail.com>
Date: Mon, 17 Dec 2018 12:37:15 +0100
Subject: preview almost works

---
 src/gui/latexprocess.cpp | 98 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 98 insertions(+)
 create mode 100644 src/gui/latexprocess.cpp

(limited to 'src/gui/latexprocess.cpp')

diff --git a/src/gui/latexprocess.cpp b/src/gui/latexprocess.cpp
new file mode 100644
index 0000000..f81e883
--- /dev/null
+++ b/src/gui/latexprocess.cpp
@@ -0,0 +1,98 @@
+#include "latexprocess.h"
+#include "tikzit.h"
+
+#include <QDebug>
+#include <QStandardPaths>
+#include <QTemporaryDir>
+
+LatexProcess::LatexProcess(PreviewWindow *preview, QObject *parent) : QObject(parent)
+{
+    _preview = preview;
+    _output = preview->outputTextEdit();
+
+    _proc = new QProcess(this);
+    _proc->setProcessChannelMode(QProcess::MergedChannels);
+    _proc->setWorkingDirectory(_workingDir.path());
+
+    connect(_proc, SIGNAL(readyReadStandardOutput()), this, SLOT(readyReadStandardOutput()));
+    connect(_proc, SIGNAL(finished(int)), this, SLOT(finished(int)));
+
+    // for debug purposes
+    _workingDir.setAutoRemove(false);
+}
+
+void LatexProcess::makePreview(QString tikz)
+{
+    _output->clear();
+
+    if (!_workingDir.isValid()) {
+        _output->appendPlainText("COULD NOT WRITE TO TEMP DIR: " + _workingDir.path() + "\n");
+        return;
+    }
+
+    _output->appendPlainText("USING TEMP DIR: " + _workingDir.path() + "\n");
+    _output->appendPlainText("SEARCHING FOR pdflatex IN:");
+    _output->appendPlainText(qgetenv("PATH"));
+    _output->appendPlainText("\n");
+
+
+    QString pdflatex = QStandardPaths::findExecutable("pdflatex");
+    if (pdflatex.isEmpty()) {
+        _output->appendPlainText("pdflatex NOT FOUND, ABORTING.\n");
+        return;
+    }
+
+    _output->appendPlainText("FOUND: " + pdflatex + "\n");
+
+    // copy active *.tikzstyles file to preview dir
+    if (!tikzit->styleFile().isEmpty() && QFile::exists(tikzit->styleFilePath())) {
+        QFile::copy(tikzit->styleFilePath(), _workingDir.path() + "/" + tikzit->styleFile());
+    }
+
+    // copy tikzit.sty to preview dir
+    QFile::copy(":/tex/sample/tikzit.sty", _workingDir.path() + "/tikzit.sty");
+
+    // write out the file containing the tikz picture
+    QFile f(_workingDir.path() + "/preview.tex");
+    f.open(QIODevice::WriteOnly);
+    QTextStream tex(&f);
+    tex << "\\documentclass{article}\n";
+    tex << "\\usepackage[active,tightpage]{preview}\n";
+    tex << "\\PreviewEnvironment{tikzpicture}\n";
+    tex << "\\usepackage{tikzit}\n";
+    tex << "\\input{" + tikzit->styleFile() + "}\n";
+    tex << "\\begin{document}\n\n";
+    tex << tikz;
+    tex << "\n\n\\end{document}\n";
+
+    f.close();
+    _proc->start(pdflatex, QStringList() << "preview.tex");
+
+}
+
+void LatexProcess::kill()
+{
+    if (_proc->state() == QProcess::Running) _proc->kill();
+}
+
+void LatexProcess::readyReadStandardOutput()
+{
+    QByteArray s = _proc->readAllStandardOutput();
+    _output->appendPlainText(s);
+}
+
+void LatexProcess::finished(int exitCode)
+{
+    QByteArray s = _proc->readAllStandardOutput();
+    _output->appendPlainText(s);
+
+    if (exitCode == 0) {
+        QString pdf = _workingDir.path() + "/preview.pdf";
+        _output->appendPlainText("\n\nSUCCESSFULLY GENERATED: " + pdf + "\n");
+        //_preview->setPdf(pdf);
+        emit previewFinished();
+    } else {
+        _output->appendPlainText("\n\npdflatex RETURNED AN ERROR\n");
+        emit previewFinished();
+    }
+}
-- 
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