github.com/alex123012/deckhouse-controller-tools@v0.0.0-20230510090815-d594daf1af8c/pkg/genall/help/pretty/table.go (about) 1 /* 2 Copyright 2019 The Kubernetes Authors. 3 4 Licensed under the Apache License, Version 2.0 (the "License"); 5 you may not use this file except in compliance with the License. 6 You may obtain a copy of the License at 7 8 http://www.apache.org/licenses/LICENSE-2.0 9 10 Unless required by applicable law or agreed to in writing, software 11 distributed under the License is distributed on an "AS IS" BASIS, 12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 See the License for the specific language governing permissions and 14 limitations under the License. 15 */ 16 17 package pretty 18 19 // TableCalculator calculates column widths (with optional padding) 20 // for a table based on the maximum required column width. 21 type TableCalculator struct { 22 cellSizesByCol [][]int 23 24 Padding int 25 MaxWidth int 26 } 27 28 // AddRowSizes registers a new row with cells of the given sizes. 29 func (c *TableCalculator) AddRowSizes(cellSizes ...int) { 30 if len(cellSizes) > len(c.cellSizesByCol) { 31 for range cellSizes[len(c.cellSizesByCol):] { 32 c.cellSizesByCol = append(c.cellSizesByCol, []int(nil)) 33 } 34 } 35 for i, size := range cellSizes { 36 c.cellSizesByCol[i] = append(c.cellSizesByCol[i], size) 37 } 38 } 39 40 // ColumnWidths calculates the appropriate column sizes given the 41 // previously registered rows. 42 func (c *TableCalculator) ColumnWidths() []int { 43 maxColWidths := make([]int, len(c.cellSizesByCol)) 44 45 for colInd, cellSizes := range c.cellSizesByCol { 46 max := 0 47 for _, cellSize := range cellSizes { 48 if max < cellSize { 49 max = cellSize 50 } 51 } 52 maxColWidths[colInd] = max 53 } 54 55 actualMaxWidth := c.MaxWidth - c.Padding 56 for i, width := range maxColWidths { 57 if actualMaxWidth > 0 && width > actualMaxWidth { 58 maxColWidths[i] = actualMaxWidth 59 } 60 maxColWidths[i] += c.Padding 61 } 62 63 return maxColWidths 64 }