[apps/code] Handle autocomplete coloring

apps/code/python_text_area.cpp

@@ -19,6 +19,7 @@ constexpr KDColor KeywordColor = KDColor::RGB24(0xFF000C);
 // constexpr KDColor BuiltinColor = KDColor::RGB24(0x0086B3);
 constexpr KDColor OperatorColor = KDColor::RGB24(0xd73a49);
 constexpr KDColor StringColor = KDColor::RGB24(0x032f62);
+constexpr KDColor AutocompleteColor = KDColorRed;
 constexpr KDColor BackgroundColor = KDColorWhite;
 constexpr KDColor HighlightColor = Palette::Select;
 
@@ -160,6 +161,27 @@ void PythonTextArea::ContentView::drawLine(KDContext * ctx, int line, const char
     mp_lexer_free(lex);
     nlr_pop();
   }
+
+  // Redraw the autocompleted word in the right color
+  const char * autocompleteStart = m_cursorLocation;
+  assert(autocompleteStart != text);
+  if (m_autocomplete && autocompleteStart > text && autocompleteStart < text + byteLength) {
+    const char * autocompleteEnd = cursorLocation();
+    while (*autocompleteEnd != ' ' && autocompleteEnd < text + byteLength) {
+      autocompleteEnd++;
+    }
+    drawStringAt(
+        ctx,
+        line,
+        UTF8Helper::GlyphOffsetAtCodePoint(text, autocompleteStart),
+        autocompleteStart,
+        minPointer(text + byteLength, autocompleteEnd) - autocompleteStart,
+        AutocompleteColor,
+        BackgroundColor,
+        nullptr,
+        nullptr,
+        HighlightColor);
+  }
 }
 
 KDRect PythonTextArea::ContentView::dirtyRectFromPosition(const char * position, bool includeFollowingLines) const {

apps/code/python_text_area.h

@@ -21,7 +21,8 @@ protected:
   public:
     ContentView(App * pythonDelegate, const KDFont * font) :
       TextArea::ContentView(font),
-      m_pythonDelegate(pythonDelegate)
+      m_pythonDelegate(pythonDelegate),
+      m_autocomplete(false)
     {
     }
     void loadSyntaxHighlighter();
@@ -31,6 +32,7 @@ protected:
     KDRect dirtyRectFromPosition(const char * position, bool includeFollowingLines) const override;
   private:
     App * m_pythonDelegate;
+    bool m_autocomplete;
   };
 private:
   const ContentView * nonEditableContentView() const override { return &m_contentView; }