Fix wrapping calculation

src/ui_model/model_layout.rs

@@ -15,13 +15,18 @@ impl ModelLayout {
     /// Wrap all lines into model
     ///
     /// returns actual width
-    pub fn layout(&mut self, lines: Vec<Vec<(Option<Attrs>, Vec<char>)>>, max_columns: u64) -> (u64, u64) {
-        //FIXME: lines.len is not real lines count
-        if lines.len() > self.model.rows || max_columns as usize > self.model.columns {
+    pub fn layout(
+        &mut self,
+        lines: Vec<Vec<(Option<Attrs>, Vec<char>)>>,
+        max_columns: u64,
+    ) -> (u64, u64) {
+        let rows = ModelLayout::count_lines(&lines, max_columns);
+
+        if rows as usize > self.model.rows || max_columns as usize > self.model.columns {
             let model_cols = ((max_columns / ModelLayout::COLUMNS_STEP) + 1) *
                 ModelLayout::COLUMNS_STEP;
-            let model_rows = ((lines.len() as u64 / ModelLayout::ROWS_STEP) + 1) *
-                ModelLayout::ROWS_STEP;
+
+            let model_rows = ((rows as u64 / ModelLayout::ROWS_STEP) + 1) * ModelLayout::ROWS_STEP;
 
             self.model = UiModel::new(model_rows, model_cols);
         }
@@ -36,6 +41,8 @@ impl ModelLayout {
                     if col_idx >= max_columns {
                         col_idx = 0;
                         row_idx += 1;
+                    } else {
+                        col_idx += 1;
                     }
 
                     if max_col_idx < col_idx {
@@ -44,12 +51,35 @@ impl ModelLayout {
 
                     self.model.set_cursor(row_idx, col_idx as usize);
                     self.model.put(ch, false, attr.as_ref());
-                    col_idx += 1;
                 }
             }
             row_idx += 1;
         }
 
-        (max_col_idx + 1, row_idx as u64)
+        (max_col_idx + 1, rows)
+    }
+
+    fn count_lines(lines: &Vec<Vec<(Option<Attrs>, Vec<char>)>>, max_columns: u64) -> u64 {
+        let mut row_count = 0;
+
+        for line in lines {
+            let len: usize = line.iter().map(|c| c.1.len()).sum();
+            row_count += len as u64 / (max_columns + 1) + 1;
+        }
+
+        row_count
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_count_lines() {
+        let lines = vec![vec![(None, vec!['a'; 5])]];
+
+        let rows = ModelLayout::count_lines(&lines, 4);
+        assert_eq!(2, rows);
     }
 }