Add warning if inline script file is invalid

data/locale/en-US.ini

@@ -1543,6 +1543,9 @@ AdvSceneSwitcher.script.language.select="--select language--"
 AdvSceneSwitcher.script.language.layout="Script language:{{language}}"
 AdvSceneSwitcher.script.file.open="Open"
 AdvSceneSwitcher.script.file.open.failed="Could not open script file!"
+AdvSceneSwitcher.script.file.warning.notFound="Warning: The given file path was not found!"
+AdvSceneSwitcher.script.file.warning.openFail="Warning: Could not open the script file!"
+AdvSceneSwitcher.script.file.warning.loadMissing="Warning: The script is missing a 'script_load' function!"
 AdvSceneSwitcher.script.file.layout="Script file:{{path}}{{open}}"
 
 AdvSceneSwitcher.tempVar.select="--select value--"

plugins/scripting/macro-segment-script-inline.cpp

@@ -5,6 +5,7 @@
 #include "ui-helpers.hpp"
 
 #include <QDesktopServices>
+#include <QFile>
 
 namespace advss {
 
@@ -57,6 +58,7 @@ MacroSegmentScriptInlineEdit::MacroSegmentScriptInlineEdit(
 	  _openFile(new QPushButton(
 		  obs_module_text("AdvSceneSwitcher.script.file.open"), this)),
 	  _fileLayout(new QHBoxLayout()),
+	  _contentIssueWarning(new QLabel(this)),
 	  _entryData(entryData)
 {
 	SetupLayout();
@@ -127,6 +129,8 @@ void MacroSegmentScriptInlineEdit::PathChanged(const QString &path)
 	const QSignalBlocker b(_path);
 	_path->SetPath(pathAdjusted);
 	_entryData->SetPath(pathAdjusted.toStdString());
+
+	SetupContentIssueWarning();
 }
 
 void MacroSegmentScriptInlineEdit::PopulateWidgets()
@@ -182,6 +186,7 @@ void MacroSegmentScriptInlineEdit::SetupLayout()
 	layout->addLayout(languageLayout);
 	layout->addLayout(_fileLayout);
 	layout->addWidget(_script);
+	layout->addWidget(_contentIssueWarning);
 	setLayout(layout);
 }
 
@@ -191,8 +196,66 @@ void MacroSegmentScriptInlineEdit::SetWidgetVisibility()
 			    InlineScript::Type::INLINE);
 	SetLayoutVisible(_fileLayout,
 			 _entryData->GetType() == InlineScript::Type::FILE);
+	SetupContentIssueWarning();
+
 	adjustSize();
 	updateGeometry();
 }
 
+void MacroSegmentScriptInlineEdit::SetupContentIssueWarning() const
+{
+	if (_entryData->GetType() == InlineScript::Type::INLINE) {
+		_contentIssueWarning->hide();
+		return;
+	}
+
+	const auto path = QString::fromStdString(_entryData->GetPath());
+	QFile file(path);
+
+	if (!file.exists()) {
+		_contentIssueWarning->setText(obs_module_text(
+			"AdvSceneSwitcher.script.file.warning.notFound"));
+		_contentIssueWarning->show();
+		return;
+	}
+
+	if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) {
+		_contentIssueWarning->setText(obs_module_text(
+			"AdvSceneSwitcher.script.file.warning.openFail"));
+		_contentIssueWarning->show();
+		return;
+	}
+
+	QTextStream in(&file);
+	QStringList fileLines;
+
+	while (!in.atEnd()) {
+		QString line = in.readLine().trimmed();
+		fileLines << line.trimmed();
+	}
+
+	file.close();
+
+	static const QStringList requiredLinesLUA = {
+		"function script_load(settings)"};
+	static const QStringList requiredLinesPython = {
+		"def script_load(settings):"};
+
+	const auto &requiredLines = _entryData->GetLanguage() ==
+						    OBS_SCRIPT_LANG_PYTHON
+					    ? requiredLinesPython
+					    : requiredLinesLUA;
+
+	for (const QString &required : requiredLines) {
+		if (fileLines.contains(required)) {
+			_contentIssueWarning->hide();
+			return;
+		}
+	}
+
+	_contentIssueWarning->setText(obs_module_text(
+		"AdvSceneSwitcher.script.file.warning.loadMissing"));
+	_contentIssueWarning->show();
+}
+
 } // namespace advss

plugins/scripting/macro-segment-script-inline.hpp

@@ -42,6 +42,7 @@ protected:
 	void SetupWidgetConnections();
 	void SetupLayout();
 	void SetWidgetVisibility();
+	void SetupContentIssueWarning() const;
 
 	QComboBox *_scriptType;
 	QComboBox *_language;
@@ -49,6 +50,7 @@ protected:
 	FileSelection *_path;
 	QPushButton *_openFile;
 	QHBoxLayout *_fileLayout;
+	QLabel *_contentIssueWarning;
 
 	std::shared_ptr<MacroSegmentScriptInline> _entryData;
 	bool _loading = true;