Add optional guards

This not really necessary right now, but it is a good future-proof measure anyway

src/cell.h

@@ -1,3 +1,5 @@
+#ifndef TREESHEETS_CELL_H
+#define TREESHEETS_CELL_H
 
 /* The evaluation types for a cell.
 CT_DATA: "Data"
@@ -540,3 +542,5 @@ struct Cell {
         return this;
     }
 };
+
+#endif

src/document.h

@@ -1,3 +1,6 @@
+#ifndef TREESHEETS_DOCUMENT_H
+#define TREESHEETS_DOCUMENT_H
+
 #ifndef PACKAGE_VERSION
     #define PACKAGE_VERSION __DATE__
 #endif
@@ -2336,3 +2339,5 @@ struct Document {
         Refresh();
     }
 };
+
+#endif

src/evaluator.h

@@ -1,3 +1,5 @@
+#ifndef TREESHEETS_EVALUATOR_H
+#define TREESHEETS_EVALUATOR_H
 
 /*
     A structure describing an operation.
@@ -210,3 +212,5 @@ struct Evaluator {
         ClearVars();
     }
 };
+
+#endif

src/grid.h

@@ -1,3 +1,5 @@
+#ifndef TREESHEETS_GRID_H
+#define TREESHEETS_GRID_H
 
 struct Grid {
     // owning cell.
@@ -1111,3 +1113,5 @@ struct Grid {
 
     void ClearImages(const Selection &s) { foreachcellinsel(c, s) c->text.image = nullptr; }
 };
+
+#endif

src/lobster_impl.cpp

@@ -1,8 +1,8 @@
+#ifndef TREESHEETS_LOBSTER_IMPL_H
+#define TREESHEETS_LOBSTER_IMPL_H
 
 #include "lobster/stdafx.h"
-
 #include "script_interface.h"
-
 #include "lobster/compiler.h"
 
 using namespace lobster;
@@ -228,3 +228,4 @@ FileLoader EnginePreInit(NativeRegistry &nfr) {
 extern "C" void GLFrame(StackPtr, VM &) {}
 string BreakPoint(lobster::VM &vm, string_view reason) { return {}; }
 
+#endif

src/myapp.h

@@ -1,3 +1,5 @@
+#ifndef TREESHEETS_MYAPP_H
+#define TREESHEETS_MYAPP_H
 
 struct IPCServer : wxServer {
     wxConnectionBase *OnAcceptConnection(const wxString &topic) {
@@ -182,3 +184,5 @@ struct MyApp : wxApp {
 
     DECLARE_EVENT_TABLE()
 };
+
+#endif

src/mycanvas.h

@@ -1,3 +1,6 @@
+#ifndef TREESHEETS_MYCANVAS_H
+#define TREESHEETS_MYCANVAS_H
+
 struct TSCanvas : public wxScrolledCanvas {
     MyFrame *frame;
     Document *doc {nullptr};
@@ -187,3 +190,5 @@ struct TSCanvas : public wxScrolledCanvas {
 
     DECLARE_EVENT_TABLE()
 };
+
+#endif

src/myframe.h

@@ -1,3 +1,6 @@
+#ifndef TREESHEETS_MYFRAME_H
+#define TREESHEETS_MYFRAME_H
+
 struct MyFrame : wxFrame {
     wxString exepath_;
     MyApp *app;
@@ -1326,3 +1329,5 @@ struct MyFrame : wxFrame {
 
     DECLARE_EVENT_TABLE()
 };
+
+#endif

src/mywxtools.h

@@ -1,3 +1,5 @@
+#ifndef TREESHEETS_MYWXTOOLS_H
+#define TREESHEETS_MYWXTOOLS_H
 
 static void DrawRectangle(wxDC &dc, uint c, int x, int y, int xs, int ys, bool outline = false) {
     if (outline)
@@ -252,3 +254,5 @@ static uint64_t CalculateHash(vector<uint8_t> &idv) {
     int max = 4096;
     return FNV1A64(idv.data(), min(idv.size(), max));
 }
+
+#endif

src/script_interface.h

@@ -1,3 +1,6 @@
+#ifndef TREESHEETS_SCRIPT_INTERFACE_H
+#define TREESHEETS_SCRIPT_INTERFACE_H
+
 typedef int64_t (*FileLoader)(string_view_nt absfilename, std::string *dest, int64_t start, int64_t len);
 
 namespace script {
@@ -45,3 +48,5 @@ extern std::string RunLobster(std::string_view filename, std::string_view code,
 extern void TSDumpBuiltinDoc();
 
 }  // namespace script
+
+#endif

src/selection.h

@@ -1,3 +1,5 @@
+#ifndef TREESHEETS_SELECTION_H
+#define TREESHEETS_SELECTION_H
 
 class Selection {
     bool textedit {false};
@@ -398,3 +400,5 @@ class Selection {
         doc->DrawSelectMove(dc, *this);
     }
 };
+
+#endif

src/system.h

@@ -1,3 +1,6 @@
+#ifndef TREESHEETS_SYSTEM_H
+#define TREESHEETS_SYSTEM_H
+
 struct Image {
     vector<uint8_t> image_data;
     char image_type;
@@ -632,3 +635,5 @@ struct System {
 
     void ImageDraw(wxBitmap *bm, wxDC &dc, int x, int y) { dc.DrawBitmap(*bm, x, y); }
 };
+
+#endif

src/text.h

@@ -1,3 +1,5 @@
+#ifndef TREESHEETS_TEXT_H
+#define TREESHEETS_TEXT_H
 
 struct Text {
     Cell *cell {nullptr};
@@ -505,3 +507,5 @@ struct Text {
         }
     }
 };
+
+#endif