elm_code widget: backspace or delete merges lines

This is text only for now but serves as editor foundation.

elm_code/src/lib/elm_code_file.c

@@ -212,6 +212,34 @@ EAPI void elm_code_file_line_insert(Elm_Code_File *file, unsigned int row, const
      }
 }
 
+EAPI void elm_code_file_line_remove(Elm_Code_File *file, unsigned int row)
+{
+   Eina_List *item, *next;
+   Elm_Code_Line *line_item, *tofree = NULL;
+   unsigned int r;
+
+   r = row;
+   EINA_LIST_FOREACH_SAFE(file->lines, item, next, line_item)
+     {
+        if (line_item->number < row)
+          continue;
+        else if (line_item->number == row)
+          {
+             tofree = line_item;
+             file->lines = eina_list_remove_list(file->lines, item);
+             continue;
+          }
+
+        line_item->number = r++;
+
+        if (file->parent)
+          elm_code_callback_fire(file->parent, &ELM_CODE_EVENT_LINE_LOAD_DONE, line_item);
+     }
+
+   if (tofree)
+     elm_code_line_free(tofree);
+}
+
 EAPI Elm_Code_Line *elm_code_file_line_get(Elm_Code_File *file, unsigned int number)
 {
    return eina_list_nth(file->lines, number - 1);

elm_code/src/lib/elm_code_file.h

@@ -62,6 +62,8 @@ EAPI void elm_code_file_line_append(Elm_Code_File *file, const char *line, int l
 
 EAPI void elm_code_file_line_insert(Elm_Code_File *file, unsigned int row, const char *line, int length, void *data);
 
+EAPI void elm_code_file_line_remove(Elm_Code_File *file, unsigned int row);
+
 EAPI Elm_Code_Line *elm_code_file_line_get(Elm_Code_File *file, unsigned int line);
 
 /**

elm_code/src/lib/elm_code_text.c

@@ -20,6 +20,29 @@ elm_code_line_text_get(Elm_Code_Line *line, unsigned int *length)
    return line->content;
 }
 
+EAPI void
+elm_code_line_text_set(Elm_Code_Line *line, const char *chars, unsigned int length)
+{
+   Elm_Code_File *file;
+   char *newtext;
+
+   if (!line)
+     return;
+
+   if (line->modified)
+     free(line->modified);
+
+   newtext = malloc(sizeof(char) * length + 1);
+   strncpy(newtext, chars, length);
+   line->modified = newtext;
+   line->length = length;
+// TODO update calculation
+   line->unicode_length = length;
+
+   file = line->file;
+   elm_code_callback_fire(file->parent, &ELM_CODE_EVENT_LINE_LOAD_DONE, line);
+}
+
 static void
 _elm_code_line_tokens_move_right(Elm_Code_Line *line, int position, int move)
 {

elm_code/src/lib/elm_code_text.h

@@ -22,6 +22,8 @@ extern "C" {
 
 EAPI const char *elm_code_line_text_get(Elm_Code_Line *line, unsigned int *length);
 
+EAPI void elm_code_line_text_set(Elm_Code_Line *line, const char *chars, unsigned int length);
+
 EAPI void elm_code_line_text_insert(Elm_Code_Line *line, unsigned int position, const char *string, int length);
 
 EAPI void elm_code_line_text_remove(Elm_Code_Line *line, unsigned int position, int length);

elm_code/src/lib/elm_code_widget.c

@@ -648,6 +648,49 @@ _elm_code_widget_newline(Elm_Code_Widget *widget)
          elm_code_widget_cursor_position_set(1, row + 1));
 }
 
+static void
+_elm_code_widget_backspaceline(Elm_Code_Widget *widget, Eina_Bool nextline)
+{
+   Elm_Code *code;
+   Elm_Code_Line *line, *otherline;
+   unsigned int row, col;
+
+   const char *text1, *text2;
+   char *newtext;
+   unsigned int length1, length2;
+
+   eo_do(widget,
+         code = elm_code_widget_code_get(),
+         elm_code_widget_cursor_position_get(&col, &row));
+   line = elm_code_file_line_get(code->file, row);
+
+   if (nextline)
+     {
+        otherline = elm_code_file_line_get(code->file, row + 1);
+        text1 = elm_code_line_text_get(line, &length1);
+        text2 = elm_code_line_text_get(otherline, &length2);
+     }
+   else
+     {
+        otherline = elm_code_file_line_get(code->file, row - 1);
+        text1 = elm_code_line_text_get(otherline, &length1);
+        text2 = elm_code_line_text_get(line, &length2);
+     }
+
+   newtext = malloc(sizeof(char) * (length1 + length2 + 1));
+   snprintf(newtext, length1 + 1, "%s", text1);
+   snprintf(newtext + length1, length2 + 1, "%s", text2);
+
+// TODO we need to merge tokens from these lines (move this to elm_code_text)
+   elm_code_file_line_remove(code->file, otherline->number);
+   elm_code_line_text_set(line, newtext, length1 + length2);
+
+   free(newtext);
+   if (!nextline)
+     eo_do(widget,
+           elm_code_widget_cursor_position_set(length1 + 1, row - 1));
+}
+
 static void
 _elm_code_widget_backspace(Elm_Code_Widget *widget)
 {
@@ -660,7 +703,16 @@ _elm_code_widget_backspace(Elm_Code_Widget *widget)
          elm_code_widget_cursor_position_get(&col, &row));
 
    if (col <= 1)
-     return;
+     {
+        if (row == 1)
+          return;
+
+        _elm_code_widget_backspaceline(widget, EINA_FALSE);
+        line = elm_code_file_line_get(code->file, row - 1);
+
+        return;
+     }
+
    line = elm_code_file_line_get(code->file, row);
 
    elm_code_line_text_remove(line, col - 1, 1);
@@ -680,7 +732,13 @@ _elm_code_widget_delete(Elm_Code_Widget *widget)
          elm_code_widget_cursor_position_get(&col, &row));
    line = elm_code_file_line_get(code->file, row);
    if (col > line->unicode_length)
-     return;
+     {
+        if (row == elm_code_file_lines_get(code->file))
+          return;
+
+        _elm_code_widget_backspaceline(widget, EINA_TRUE);
+        return;
+     }
 
    elm_code_line_text_remove(line, col, 1);
    eo_do(widget,