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package termprint
import (
"io"
"os"
"strings"
"sync"
"github.com/mattn/go-runewidth"
"golang.org/x/term"
)
// ColumnPrinter streams provider output in side-by-side columns.
type ColumnPrinter struct {
mu sync.Mutex
stdout io.Writer
columns int
colWidth int
partial []string
providers []string
models []string
}
type columnWriter struct {
printer *ColumnPrinter
index int
}
// NewColumnPrinter builds a multi-column printer for the provider/model pairs.
func NewColumnPrinter(stdout io.Writer, providers []string, models []string) *ColumnPrinter {
cols := len(providers)
if len(models) > cols {
cols = len(models)
}
if cols == 0 {
return nil
}
width := detectTerminalWidth(stdout)
if width <= 0 {
width = 100
}
sepWidth := (cols - 1) * 3
colWidth := (width - sepWidth) / cols
if colWidth < 20 {
colWidth = 20
}
providerCols := make([]string, cols)
copy(providerCols, providers)
modelCols := make([]string, cols)
copy(modelCols, models)
return &ColumnPrinter{
stdout: stdout,
columns: cols,
colWidth: colWidth,
partial: make([]string, cols),
providers: providerCols,
models: modelCols,
}
}
func detectTerminalWidth(w io.Writer) int {
type fder interface{ Fd() uintptr }
if f, ok := w.(*os.File); ok {
if width, _, err := term.GetSize(int(f.Fd())); err == nil {
return width
}
}
if f, ok := w.(fder); ok {
if width, _, err := term.GetSize(int(f.Fd())); err == nil {
return width
}
}
return 0
}
// Writer returns an io.Writer that routes chunks to a single column index.
func (cp *ColumnPrinter) Writer(idx int) io.Writer {
return columnWriter{printer: cp, index: idx}
}
// PrintHeader writes provider/model headers and a divider row.
func (cp *ColumnPrinter) PrintHeader() {
cp.mu.Lock()
defer cp.mu.Unlock()
combo := make([]string, cp.columns)
for i := 0; i < cp.columns; i++ {
provider := strings.TrimSpace(cp.providers[i])
model := strings.TrimSpace(cp.models[i])
switch {
case provider != "" && model != "":
combo[i] = provider + ":" + model
case provider != "":
combo[i] = provider
case model != "":
combo[i] = model
default:
combo[i] = ""
}
}
cp.writeLine(combo)
divider := make([]string, cp.columns)
line := strings.Repeat("─", cp.colWidth)
for i := range divider {
divider[i] = line
}
cp.writeLine(divider)
}
// Flush emits any buffered partial line for a column.
func (cp *ColumnPrinter) Flush(idx int) {
cp.mu.Lock()
defer cp.mu.Unlock()
if idx < 0 || idx >= len(cp.partial) {
return
}
if cp.partial[idx] == "" {
return
}
cp.emitJobLine(idx, cp.partial[idx])
cp.partial[idx] = ""
}
func (w columnWriter) Write(p []byte) (int, error) {
return w.printer.write(w.index, string(p))
}
func (cp *ColumnPrinter) write(idx int, data string) (int, error) {
cp.mu.Lock()
defer cp.mu.Unlock()
if idx < 0 || idx >= len(cp.partial) {
return len(data), nil
}
data = strings.ReplaceAll(data, "\r", "")
cp.partial[idx] += data
for strings.Contains(cp.partial[idx], "\n") {
line, rest, _ := strings.Cut(cp.partial[idx], "\n")
cp.partial[idx] = rest
cp.emitJobLine(idx, line)
}
return len(data), nil
}
func (cp *ColumnPrinter) emitJobLine(idx int, line string) {
segments := cp.wrap(line)
for _, seg := range segments {
cells := make([]string, cp.columns)
if idx >= 0 && idx < len(cells) {
cells[idx] = seg
}
cp.writeLine(cells)
}
}
func (cp *ColumnPrinter) wrap(text string) []string {
text = strings.ReplaceAll(text, "\t", " ")
if runewidth.StringWidth(text) <= cp.colWidth {
return []string{text}
}
var lines []string
var current strings.Builder
width := 0
for _, r := range text {
rw := runewidth.RuneWidth(r)
if width+rw > cp.colWidth && current.Len() > 0 {
lines = append(lines, current.String())
current.Reset()
width = 0
}
current.WriteRune(r)
width += rw
}
if current.Len() > 0 {
lines = append(lines, current.String())
}
if len(lines) == 0 {
lines = append(lines, "")
}
return lines
}
func (cp *ColumnPrinter) writeLine(cells []string) {
if len(cells) < cp.columns {
extra := make([]string, cp.columns-len(cells))
cells = append(cells, extra...)
}
var builder strings.Builder
for i := 0; i < cp.columns; i++ {
cell := cells[i]
width := runewidth.StringWidth(cell)
if width > cp.colWidth {
cell = runewidth.Truncate(cell, cp.colWidth, "…")
width = runewidth.StringWidth(cell)
}
builder.WriteString(cell)
if pad := cp.colWidth - width; pad > 0 {
builder.WriteString(strings.Repeat(" ", pad))
}
if i != cp.columns-1 {
builder.WriteString(" │ ")
}
}
builder.WriteByte('\n')
_, _ = cp.stdout.Write([]byte(builder.String()))
}
|
