Method printRow

cf/terminal/table.go:179–255

printRow is responsible for the laying-out, transforming and printing of the string in a single row

(result io.Writer, transformer rowTransformer, rowIndex int, row []string)

// printRow is responsible for the laying-out, transforming and
// printing of the string in a single row
func (t *Table) printRow(result io.Writer, transformer rowTransformer, rowIndex int, row []string) error {

	height := t.rowHeight[rowIndex]

	// Compute the index of the last column as the min number of
	// cells in the header and cells in the current row.
	// Note: math.Min seems to be for float only :(
	last := len(t.headers) - 1
	lastr := len(row) - 1
	if lastr < last {
		last = lastr
	}

	// Note how we always print into a line buffer before placing
	// the assembled line into the result. This allows us to trim
	// superfluous trailing whitespace from the line before making
	// it final.

	if height <= 1 {
		// Easy case, all cells in the row are single-line
		line := &bytes.Buffer{}

		for columnIndex := range row {
			// Truncate long row, ignore the additional fields.
			if columnIndex >= len(t.headers) {
				break
			}

			err := t.printCellValue(line, transformer, columnIndex, last, row[columnIndex])
			if err != nil {
				return err
			}
		}

		fmt.Fprintf(result, "%s\n", trim(string(line.Bytes())))
		return nil
	}

	// We have at least one multi-line cell in this row.
	// Treat it a bit like a mini-table.

	// Step I. Fill the mini-table. Note how it is stored
	//         column-major, not row-major.

	// [column][row]string
	sub := make([][]string, len(t.headers))
	for columnIndex := range row {
		// Truncate long row, ignore the additional fields.
		if columnIndex >= len(t.headers) {
			break
		}
		sub[columnIndex] = strings.Split(row[columnIndex], "\n")
		// (*) Extend the column to the full height.
		for len(sub[columnIndex]) < height {
			sub[columnIndex] = append(sub[columnIndex], "")
		}
	}