ViewTask

- When supplied with a vector of attribute names, can insert spacing into the
  rendered output when values change.  These we call listing breaks.

src/ViewTask.cpp

@@ -307,6 +307,25 @@ std::string ViewTask::render (std::vector <Task>& data, std::vector <int>& seque
         max_lines = cells[c].size ();
     }
 
+    // Listing breaks are simply blank lines inserted when a column value
+    // changes.
+    if (s > 0 &&
+        _breaks.size () > 0)
+    {
+      std::vector <std::string>::iterator b;
+      for (b = _breaks.begin (); b != _breaks.end (); ++b)
+      {
+        if (data[sequence[s - 1]].get (*b) != data[sequence[s]].get (*b))
+        {
+          out += "\n";
+          ++_lines;
+
+          // Only want one \n, regardless of how many values change.
+          break;
+        }
+      }
+    }
+
     for (unsigned int i = 0; i < max_lines; ++i)
     {
       out += left_margin + (odd ? extra_odd : extra_even);

src/ViewTask.h

@@ -40,43 +40,45 @@ public:
   ~ViewTask ();
 
   // View specifications.
-  void add (Column* column)       { _columns.push_back (column); }
-  void width (int width)          { _width = width;              }
-  void leftMargin (int margin)    { _left_margin = margin;       }
-  void colorHeader (Color& c)     { _header = c;                 }
-  void colorOdd (Color& c)        { _odd = c;                    }
-  void colorEven (Color& c)       { _even = c;                   }
-  void intraPadding (int padding) { _intra_padding = padding;    }
-  void intraColorOdd (Color& c)   { _intra_odd = c;              }
-  void intraColorEven (Color& c)  { _intra_even = c;             }
-  void extraPadding (int padding) { _extra_padding = padding;    }
-  void extraColorOdd (Color& c)   { _extra_odd = c;              }
-  void extraColorEven (Color& c)  { _extra_even = c;             }
-  void truncateLines (int n)      { _truncate_lines = n;         }
-  void truncateRows (int n)       { _truncate_rows = n;          }
-  int lines ()                    { return _lines;               }
-  int rows ()                     { return _rows;                }
+  void add (Column* column)               { _columns.push_back (column); }
+  void width (int width)                  { _width = width;              }
+  void leftMargin (int margin)            { _left_margin = margin;       }
+  void colorHeader (Color& c)             { _header = c;                 }
+  void colorOdd (Color& c)                { _odd = c;                    }
+  void colorEven (Color& c)               { _even = c;                   }
+  void intraPadding (int padding)         { _intra_padding = padding;    }
+  void intraColorOdd (Color& c)           { _intra_odd = c;              }
+  void intraColorEven (Color& c)          { _intra_even = c;             }
+  void extraPadding (int padding)         { _extra_padding = padding;    }
+  void extraColorOdd (Color& c)           { _extra_odd = c;              }
+  void extraColorEven (Color& c)          { _extra_even = c;             }
+  void truncateLines (int n)              { _truncate_lines = n;         }
+  void truncateRows (int n)               { _truncate_rows = n;          }
+  void addBreak (const std::string& attr) { _breaks.push_back (attr);    }
+  int lines ()                            { return _lines;               }
+  int rows ()                             { return _rows;                }
 
   // View rendering.
   std::string render (std::vector <Task>&, std::vector <int>&);
 
 private:
-  std::vector <Column*> _columns;
-  int                   _width;
-  int                   _left_margin;
-  Color                 _header;
-  Color                 _odd;
-  Color                 _even;
-  int                   _intra_padding;
-  Color                 _intra_odd;
-  Color                 _intra_even;
-  int                   _extra_padding;
-  Color                 _extra_odd;
-  Color                 _extra_even;
-  int                   _truncate_lines;
-  int                   _truncate_rows;
-  int                   _lines;
-  int                   _rows;
+  std::vector <Column*>     _columns;
+  std::vector <std::string> _breaks;
+  int                       _width;
+  int                       _left_margin;
+  Color                     _header;
+  Color                     _odd;
+  Color                     _even;
+  int                       _intra_padding;
+  Color                     _intra_odd;
+  Color                     _intra_even;
+  int                       _extra_padding;
+  Color                     _extra_odd;
+  Color                     _extra_even;
+  int                       _truncate_lines;
+  int                       _truncate_rows;
+  int                       _lines;
+  int                       _rows;
 };
 
 #endif