Create empty file if input doesn't exist

src/buffer.d

@@ -50,18 +50,23 @@ class Buffer {
 
     void remove(ulong start, ulong end) {
         text.remove(start, end);
+        update();
     }
     void insert(ulong position, string value) {
         text.insert(position, value);
+        update();
     }
     string substring(ulong start, ulong end = -1) {
         if (end == -1) {
+            update();
             return text.substring(start, text.length);
         } else {
+            update();
             return text.substring(start, end);
         }
     }
     char charAt(ulong pos) {
+        update();
         return text.charAt(pos);
     }
 }

src/main.d

@@ -12,12 +12,24 @@ void main(string[] args) {
 
     if (args.length > 1) {
         filename = args[1];
-        fileTxt = readText(filename);
+        if (!exists(filename)) {
+            File file = File(filename, "w");
+            file.close();
+        } else {
+            if (isDir(filename)) {
+                writeln(filename, " is a directory");
+                return;
+            }
+            fileTxt = readText(filename);
+            if (fileTxt is null) {
+                fileTxt = "";
+            }
+        }
     }
 
+    Buffer buf = new Buffer(fileTxt, filename);
     init();
 
-    Buffer buf = new Buffer(fileTxt, filename);
     Cursor cursor = new Cursor();
     View v = new View(buf, cursor);
 

src/rope.d

@@ -51,6 +51,9 @@ class Rope {
     void remove(ulong start, ulong end) {
         if (value !is null) {
             value = to!string(value.to!dstring[0 .. start] ~ value.to!dstring[end .. $]);
+            if (value is null) {
+                value = "";
+            }
             length = value.count;
         } else {
             auto leftStart = min(start, left.length);

src/view.d

@@ -152,7 +152,6 @@ class View {
             if (cursor.y > topline + height-1) {
                 topline = cursor.y - height-1;
             }
-            buf.update();
         }
     }