mirror of
https://github.com/neilotoole/sq.git
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162 lines
3.3 KiB
Go
162 lines
3.3 KiB
Go
// Package htmlw implements a RecordWriter for HTML.
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package htmlw
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import (
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"bytes"
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"context"
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"encoding/base64"
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"fmt"
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"html"
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"io"
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"strconv"
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"sync"
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"time"
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"github.com/shopspring/decimal"
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"github.com/neilotoole/sq/cli/output"
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"github.com/neilotoole/sq/libsq/core/errz"
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"github.com/neilotoole/sq/libsq/core/kind"
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"github.com/neilotoole/sq/libsq/core/record"
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"github.com/neilotoole/sq/libsq/core/stringz"
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)
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// RecordWriter implements output.RecordWriter.
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type recordWriter struct {
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out io.Writer
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pr *output.Printing
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buf *bytes.Buffer
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recMeta record.Meta
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mu sync.Mutex
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}
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var _ output.NewRecordWriterFunc = NewRecordWriter
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// NewRecordWriter an output.RecordWriter for HTML.
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func NewRecordWriter(out io.Writer, pr *output.Printing) output.RecordWriter {
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return &recordWriter{out: out, pr: pr}
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}
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// Open implements output.RecordWriter.
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func (w *recordWriter) Open(_ context.Context, recMeta record.Meta) error {
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w.recMeta = recMeta
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w.buf = &bytes.Buffer{}
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const header = `<!doctype html>
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<html>
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<head>
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<title>sq output</title>
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</head>
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<body>
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<table>
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<colgroup>
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`
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w.buf.WriteString(header)
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for _, field := range recMeta {
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w.buf.WriteString(" <col class=\"kind-")
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w.buf.WriteString(field.Kind().String())
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w.buf.WriteString("\" />\n")
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}
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w.buf.WriteString(" </colgroup>\n <thead>\n <tr>\n")
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for _, field := range recMeta {
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w.buf.WriteString(" <th scope=\"col\">")
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w.buf.WriteString(field.MungedName())
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w.buf.WriteString("</th>\n")
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}
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w.buf.WriteString(" </tr>\n </thead>\n <tbody>\n")
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return nil
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}
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// Flush implements output.RecordWriter.
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func (w *recordWriter) Flush(context.Context) error {
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w.mu.Lock()
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defer w.mu.Unlock()
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_, err := w.buf.WriteTo(w.out) // resets buf
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return errz.Err(err)
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}
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// Close implements output.RecordWriter.
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func (w *recordWriter) Close(ctx context.Context) error {
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err := w.Flush(ctx)
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if err != nil {
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return err
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}
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const footer = ` </tbody>
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</table>
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</body>
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</html>
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`
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_, err = w.out.Write([]byte(footer))
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return errz.Err(err)
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}
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func (w *recordWriter) writeRecord(rec record.Record) error {
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w.buf.WriteString(" <tr>\n")
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var s string
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for i, field := range rec {
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w.buf.WriteString(" <td>")
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switch val := field.(type) {
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default:
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s = html.EscapeString(fmt.Sprintf("%v", val))
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// should never happen
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case nil:
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// nil is rendered as empty string, which this cell already is
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case int64:
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s = strconv.FormatInt(val, 10)
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case string:
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s = html.EscapeString(val)
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case bool:
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s = strconv.FormatBool(val)
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case float64:
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s = stringz.FormatFloat(val)
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case decimal.Decimal:
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s = stringz.FormatDecimal(val)
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case []byte:
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s = base64.StdEncoding.EncodeToString(val)
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case time.Time:
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switch w.recMeta[i].Kind() { //nolint:exhaustive
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default:
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s = w.pr.FormatDatetime(val)
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case kind.Time:
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s = w.pr.FormatTime(val)
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case kind.Date:
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s = w.pr.FormatDate(val)
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}
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}
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w.buf.WriteString(s)
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w.buf.WriteString("</td>\n")
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}
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w.buf.WriteString(" </tr>\n")
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return nil
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}
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// WriteRecords implements output.RecordWriter.
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func (w *recordWriter) WriteRecords(ctx context.Context, recs []record.Record) error {
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w.mu.Lock()
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defer w.mu.Unlock()
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var err error
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for _, rec := range recs {
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select {
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case <-ctx.Done():
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return ctx.Err()
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default:
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}
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err = w.writeRecord(rec)
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if err != nil {
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return err
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}
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}
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return nil
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}
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