elm_code: display a line-width marker if requested

elm_code/src/lib/elm_code_private.h

@@ -37,4 +37,5 @@ typedef struct
    unsigned int cursor_line, cursor_col;
    Eina_Bool editable, focussed;
    Eina_Bool show_line_numbers;
+   unsigned int line_width_marker;
 } Elm_Code_Widget_Data;

elm_code/src/lib/elm_code_widget.c

@@ -108,6 +108,22 @@ _elm_code_widget_fill_line_token(Evas_Textgrid_Cell *cells, int count, int start
      }
 }
 
+static unsigned int
+_elm_code_widget_status_type_get(Elm_Code_Widget *widget, Elm_Code_Status_Type set_type, unsigned int col)
+{
+   Elm_Code_Widget_Data *pd;
+
+   pd = eo_data_scope_get(widget, ELM_CODE_WIDGET_CLASS);
+
+   if (set_type != ELM_CODE_STATUS_TYPE_DEFAULT)
+     return set_type;
+
+   if (pd->line_width_marker == col)
+     return ELM_CODE_WIDGET_COLOR_GUTTER_BG;
+
+   return ELM_CODE_STATUS_TYPE_DEFAULT;
+}
+
 static void
 _elm_code_widget_fill_line_tokens(Elm_Code_Widget *widget, Evas_Textgrid_Cell *cells,
                                   unsigned int count, Elm_Code_Line *line)
@@ -203,14 +219,14 @@ _elm_code_widget_fill_line(Elm_Code_Widget *widget, Elm_Code_Line *line)
    for (x = gutter; x < (unsigned int) w && x < length + gutter; x++)
      {
         cells[x].codepoint = *chr;
-        cells[x].bg = line->status;
+        cells[x].bg = _elm_code_widget_status_type_get(widget, line->status, x - gutter + 1);
 
         chr++;
      }
    for (; x < (unsigned int) w; x++)
      {
         cells[x].codepoint = 0;
-        cells[x].bg = line->status;
+        cells[x].bg = _elm_code_widget_status_type_get(widget, line->status, x - gutter + 1);
      }
 
    _elm_code_widget_fill_line_tokens(widget, cells, w, line);
@@ -241,7 +257,7 @@ _elm_code_widget_empty_line(Elm_Code_Widget *widget, unsigned int number)
    for (x = gutter; x < (unsigned int) w; x++)
      {
         cells[x].codepoint = 0;
-        cells[x].bg = ELM_CODE_STATUS_TYPE_DEFAULT;
+        cells[x].bg = _elm_code_widget_status_type_get(widget, ELM_CODE_STATUS_TYPE_DEFAULT, x - gutter + 1);
      }
 
    evas_object_textgrid_update_add(pd->grid, 0, number - 1, w, 1);
@@ -709,6 +725,19 @@ _elm_code_widget_line_numbers_get(Eo *obj EINA_UNUSED, Elm_Code_Widget_Data *pd)
    return pd->show_line_numbers;
 }
 
+EOLIAN static void
+_elm_code_widget_line_width_marker_set(Eo *obj, Elm_Code_Widget_Data *pd, unsigned int col)
+{
+   pd->line_width_marker = col;
+   _elm_code_widget_fill(obj);
+}
+
+EOLIAN static unsigned int
+_elm_code_widget_line_width_marker_get(Eo *obj EINA_UNUSED, Elm_Code_Widget_Data *pd)
+{
+   return pd->line_width_marker;
+}
+
 EOLIAN static void
 _elm_code_widget_cursor_position_set(Eo *obj, Elm_Code_Widget_Data *pd, unsigned int col, unsigned int line)
 {

elm_code/src/lib/elm_code_widget.eo

@@ -103,6 +103,26 @@ class Elm_Code_Widget (Elm_Layout, Elm_Interface_Atspi_Text)
             Eina_Bool line_numbers; /*@ Whether or not line numbers (or their placeholder) should be shown */
          }
       }
+      line_width_marker {
+         set {
+            /*@
+            Set where the line width market should be shown.
+
+            Passing a non-zero value will set which line width to mark with a vertical line.
+            Passing 0 will hide this marker.
+
+            @ingroup Features */
+         }
+         get {
+            /*@
+            Get the position of the line width marker, any positive return indicates where the marker appears.
+
+            @ingroup Features */
+         }
+         values {
+            uint line_width_marker; /*@ Where to display a line width marker, if at all */
+         }
+      }
       cursor_position {
          set {
             /*@

src/bin/editor/edi_editor.c

@@ -611,7 +611,8 @@ edi_editor_add(Evas_Object *parent, Edi_Mainview_Item *item)
          elm_code_widget_code_set(code),
          elm_code_widget_font_size_set(_edi_cfg->font.size),
          elm_code_widget_editable_set(EINA_TRUE),
-         elm_code_widget_line_numbers_set(EINA_TRUE));
+         elm_code_widget_line_numbers_set(EINA_TRUE),
+         elm_code_widget_line_width_marker_set(80));
 
    editor = calloc(1, sizeof(*editor));
    editor->entry = widget;