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package ui
import (
"math"
"regexp"
"strings"
"git.sr.ht/~rjarry/aerc/config"
"git.sr.ht/~rjarry/aerc/lib/format"
"github.com/gdamore/tcell/v2"
"github.com/mattn/go-runewidth"
)
type Table struct {
Columns []Column
Rows []Row
Width int
Height int
// Optional callback that allows customizing the default drawing routine
// of table rows. If true is returned, the default routine is skipped.
CustomDraw func(t *Table, row int, c *Context) bool
// Optional callback that allows returning a custom style for the row.
GetRowStyle func(t *Table, row int) tcell.Style
// true if at least one column has WIDTH_FIT
autoFitWidths bool
// if false, widths need to be computed before drawing
widthsComputed bool
}
type Column struct {
Offset int
Width int
Def *config.ColumnDef
Separator string
}
type Row struct {
Cells []string
Priv interface{}
}
func NewTable(
width, height int,
columnDefs []*config.ColumnDef, separator string,
customDraw func(*Table, int, *Context) bool,
getRowStyle func(*Table, int) tcell.Style,
) Table {
if customDraw == nil {
customDraw = func(*Table, int, *Context) bool { return false }
}
if getRowStyle == nil {
getRowStyle = func(*Table, int) tcell.Style {
return tcell.StyleDefault
}
}
columns := make([]Column, len(columnDefs))
autoFitWidths := false
for c, col := range columnDefs {
if col.Flags.Has(config.WIDTH_FIT) {
autoFitWidths = true
}
columns[c] = Column{Def: col}
if c != len(columns)-1 {
// set separator for all columns except the last one
columns[c].Separator = separator
}
}
return Table{
Columns: columns,
Width: width,
Height: height,
CustomDraw: customDraw,
GetRowStyle: getRowStyle,
autoFitWidths: autoFitWidths,
}
}
// add a row to the table, returns true when the table is full
func (t *Table) AddRow(cells []string, priv interface{}) bool {
if len(cells) != len(t.Columns) {
panic("invalid number of cells")
}
if len(t.Rows) >= t.Height {
return true
}
t.Rows = append(t.Rows, Row{Cells: cells, Priv: priv})
if t.autoFitWidths {
t.widthsComputed = false
}
return len(t.Rows) >= t.Height
}
func (t *Table) computeWidths() {
contentMaxWidths := make([]int, len(t.Columns))
if t.autoFitWidths {
for _, row := range t.Rows {
for c := range t.Columns {
w := runewidth.StringWidth(row.Cells[c])
if w > contentMaxWidths[c] {
contentMaxWidths[c] = w
}
}
}
}
nonFixed := t.Width
autoWidthCount := 0
for c := range t.Columns {
col := &t.Columns[c]
switch {
case col.Def.Flags.Has(config.WIDTH_FIT):
col.Width = contentMaxWidths[c]
// compensate for exact width columns
col.Width += runewidth.StringWidth(col.Separator)
case col.Def.Flags.Has(config.WIDTH_EXACT):
col.Width = int(math.Round(col.Def.Width))
// compensate for exact width columns
col.Width += runewidth.StringWidth(col.Separator)
case col.Def.Flags.Has(config.WIDTH_AUTO):
col.Width = 0
autoWidthCount += 1
case col.Def.Flags.Has(config.WIDTH_FRACTION):
col.Width = int(math.Round(float64(t.Width) * col.Def.Width))
}
nonFixed -= col.Width
}
autoWidth := 0
if autoWidthCount > 0 && nonFixed > 0 {
autoWidth = nonFixed / autoWidthCount
if autoWidth == 0 {
autoWidth = 1
}
}
offset := 0
remain := t.Width
for c := range t.Columns {
col := &t.Columns[c]
if col.Def.Flags.Has(config.WIDTH_AUTO) && autoWidth > 0 {
col.Width = autoWidth
if nonFixed >= 2*autoWidth {
nonFixed -= autoWidth
}
}
if remain == 0 {
// column is outside of screen
col.Width = -1
} else if col.Width > remain {
// limit width to avoid overflow
col.Width = remain
}
remain -= col.Width
col.Offset = offset
offset += col.Width
// reserve room for separator
col.Width -= runewidth.StringWidth(col.Separator)
}
}
var metaCharsRegexp = regexp.MustCompile(`[\t\r\f\n\v]`)
func (col *Column) alignCell(cell string) string {
cell = metaCharsRegexp.ReplaceAllString(cell, " ")
width := runewidth.StringWidth(cell)
switch {
case col.Def.Flags.Has(config.ALIGN_LEFT):
if width < col.Width {
cell += strings.Repeat(" ", col.Width-width)
} else if width > col.Width {
cell = runewidth.Truncate(cell, col.Width, "…")
}
case col.Def.Flags.Has(config.ALIGN_CENTER):
if width < col.Width {
padding := strings.Repeat(" ", col.Width-width)
l := len(padding) / 2
cell = padding[:l] + cell + padding[l:]
} else if width > col.Width {
cell = runewidth.Truncate(cell, col.Width, "…")
}
case col.Def.Flags.Has(config.ALIGN_RIGHT):
if width < col.Width {
cell = strings.Repeat(" ", col.Width-width) + cell
} else if width > col.Width {
cell = format.TruncateHead(cell, col.Width, "…")
}
}
return cell
}
func (t *Table) Draw(ctx *Context) {
if !t.widthsComputed {
t.computeWidths()
t.widthsComputed = true
}
for r, row := range t.Rows {
if t.CustomDraw(t, r, ctx) {
continue
}
for c, col := range t.Columns {
if col.Width == -1 {
// column overflows screen width
continue
}
cell := col.alignCell(row.Cells[c])
style := t.GetRowStyle(t, r)
ctx.Printf(col.Offset, r, style, "%s%s", cell, col.Separator)
}
}
}
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