| @@ -0,0 +1,191 @@ |
| 1 | package control |
| 2 | |
| 3 | import ( |
| 4 | "io" |
| 5 | "strconv" |
| 6 | "strings" |
| 7 | ) |
| 8 | |
| 9 | type cellKind int |
| 10 | |
| 11 | const ( |
| 12 | kindText cellKind = iota |
| 13 | kindFlex |
| 14 | kindRef |
| 15 | kindState |
| 16 | kindAge |
| 17 | kindNum |
| 18 | ) |
| 19 | |
| 20 | // cell is one column of a table row. The kind decides colour, time |
| 21 | // format, and whether the column may be clipped to fit the terminal. |
| 22 | type cell struct { |
| 23 | kind cellKind |
| 24 | s string |
| 25 | } |
| 26 | |
| 27 | func cRef(s string) cell { return cell{kindRef, s} } |
| 28 | func cState(s string) cell { return cell{kindState, s} } |
| 29 | func cText(s string) cell { return cell{kindText, s} } |
| 30 | func cFlex(s string) cell { return cell{kindFlex, s} } |
| 31 | func cAge(ts string) cell { return cell{kindAge, ts} } |
| 32 | func cNum(n int64) cell { return cell{kindNum, strconv.FormatInt(n, 10)} } |
| 33 | |
| 34 | // table is a list command's rows. Plain, each row is written as it |
| 35 | // comes, tab-separated with no header. At a terminal rows are held |
| 36 | // until flush, then written under a header, padded, and fitted to the |
| 37 | // width. |
| 38 | type table struct { |
| 39 | term Term |
| 40 | w io.Writer |
| 41 | header []string |
| 42 | rows [][]cell |
| 43 | } |
| 44 | |
| 45 | func (c *Ctx) table(w io.Writer, header ...string) *table { |
| 46 | return &table{term: c.Term, w: w, header: header} |
| 47 | } |
| 48 | |
| 49 | func (t *table) row(cs ...cell) { |
| 50 | if t.term.Cols == 0 { |
| 51 | parts := make([]string, len(cs)) |
| 52 | for i, c := range cs { |
| 53 | if c.kind == kindAge { |
| 54 | parts[i] = stamp(c.s) |
| 55 | } else { |
| 56 | parts[i] = c.s |
| 57 | } |
| 58 | } |
| 59 | io.WriteString(t.w, strings.Join(parts, "\t")+"\n") |
| 60 | return |
| 61 | } |
| 62 | now := termNow() |
| 63 | for i := range cs { |
| 64 | if cs[i].kind == kindAge { |
| 65 | cs[i].s = relAge(cs[i].s, now) |
| 66 | } |
| 67 | } |
| 68 | t.rows = append(t.rows, cs) |
| 69 | } |
| 70 | |
| 71 | func (t *table) flush() { |
| 72 | if t.term.Cols == 0 || len(t.rows) == 0 { |
| 73 | return |
| 74 | } |
| 75 | n := len(t.header) |
| 76 | widths := make([]int, n) |
| 77 | for i, h := range t.header { |
| 78 | widths[i] = cells(h) |
| 79 | } |
| 80 | for _, r := range t.rows { |
| 81 | for i := 0; i < n && i < len(r); i++ { |
| 82 | widths[i] = max(widths[i], cells(r[i].s)) |
| 83 | } |
| 84 | } |
| 85 | t.fit(widths) |
| 86 | |
| 87 | var b strings.Builder |
| 88 | line := make([]string, n) |
| 89 | for i, h := range t.header { |
| 90 | line[i] = h |
| 91 | } |
| 92 | b.WriteString(t.term.paint(sgrDim, t.join(line, widths)) + "\n") |
| 93 | for _, r := range t.rows { |
| 94 | for i := 0; i < n; i++ { |
| 95 | s := "" |
| 96 | if i < len(r) { |
| 97 | s = clip(r[i].s, widths[i]) |
| 98 | } |
| 99 | line[i] = s |
| 100 | } |
| 101 | b.WriteString(t.joinRow(r, line, widths) + "\n") |
| 102 | } |
| 103 | io.WriteString(t.w, b.String()) |
| 104 | } |
| 105 | |
| 106 | // fit shrinks columns until a row fits the terminal: the flexible |
| 107 | // column first, down to 8 cells, then the other text columns from the |
| 108 | // right, down to 8 each. |
| 109 | func (t *table) fit(widths []int) { |
| 110 | total := func() int { |
| 111 | s := 2 * (len(widths) - 1) |
| 112 | for _, w := range widths { |
| 113 | s += w |
| 114 | } |
| 115 | return s |
| 116 | } |
| 117 | kinds := make([]cellKind, len(widths)) |
| 118 | if len(t.rows) > 0 { |
| 119 | for i := range widths { |
| 120 | if i < len(t.rows[0]) { |
| 121 | kinds[i] = t.rows[0][i].kind |
| 122 | } |
| 123 | } |
| 124 | } |
| 125 | shrink := func(i int) { |
| 126 | if over := total() - t.term.Cols; over > 0 && widths[i] > 8 { |
| 127 | widths[i] = max(8, widths[i]-over) |
| 128 | } |
| 129 | } |
| 130 | for i, k := range kinds { |
| 131 | if k == kindFlex { |
| 132 | shrink(i) |
| 133 | } |
| 134 | } |
| 135 | for i := len(kinds) - 1; i >= 0; i-- { |
| 136 | if kinds[i] == kindText { |
| 137 | shrink(i) |
| 138 | } |
| 139 | } |
| 140 | } |
| 141 | |
| 142 | // join pads every column but the last and separates them by two spaces. |
| 143 | func (t *table) join(line []string, widths []int) string { |
| 144 | var b strings.Builder |
| 145 | for i, s := range line { |
| 146 | if i > 0 { |
| 147 | b.WriteString(" ") |
| 148 | } |
| 149 | if i == len(line)-1 { |
| 150 | b.WriteString(s) |
| 151 | } else { |
| 152 | b.WriteString(pad(s, widths[i])) |
| 153 | } |
| 154 | } |
| 155 | return b.String() |
| 156 | } |
| 157 | |
| 158 | // joinRow is join with state cells coloured after padding, so the |
| 159 | // SGR bytes never count against the width. |
| 160 | func (t *table) joinRow(r []cell, line []string, widths []int) string { |
| 161 | var b strings.Builder |
| 162 | for i, s := range line { |
| 163 | if i > 0 { |
| 164 | b.WriteString(" ") |
| 165 | } |
| 166 | padding := "" |
| 167 | if i < len(line)-1 { |
| 168 | padding = strings.Repeat(" ", max(0, widths[i]-cells(s))) |
| 169 | } |
| 170 | if i < len(r) && r[i].kind == kindState { |
| 171 | s = t.term.paint(stateColor(s), s) |
| 172 | } |
| 173 | b.WriteString(s + padding) |
| 174 | } |
| 175 | return b.String() |
| 176 | } |
| 177 | |
| 178 | // stripSGR removes SGR sequences, for tests and width checks. |
| 179 | func stripSGR(s string) string { |
| 180 | var b strings.Builder |
| 181 | for i := 0; i < len(s); i++ { |
| 182 | if s[i] == 0x1b { |
| 183 | if j := strings.IndexByte(s[i:], 'm'); j >= 0 { |
| 184 | i += j |
| 185 | continue |
| 186 | } |
| 187 | } |
| 188 | b.WriteByte(s[i]) |
| 189 | } |
| 190 | return b.String() |
| 191 | } |