From d6d19b3a8f66f27f78fd2c6fa02b32fb2a88e9ad Mon Sep 17 00:00:00 2001
From: Luke Shumaker <lukeshu@lukeshu.com>
Date: Wed, 25 Jan 2023 17:41:28 -0700
Subject: Move btrfs-rec's logging RuneScanner to a new `streamio` package

---
 cmd/btrfs-rec/util.go | 61 ++-------------------------------------------------
 1 file changed, 2 insertions(+), 59 deletions(-)

(limited to 'cmd/btrfs-rec')

diff --git a/cmd/btrfs-rec/util.go b/cmd/btrfs-rec/util.go
index 9a0d60c..b2497b2 100644
--- a/cmd/btrfs-rec/util.go
+++ b/cmd/btrfs-rec/util.go
@@ -9,77 +9,20 @@ import (
 	"context"
 	"io"
 	"os"
-	"time"
 
 	"git.lukeshu.com/go/lowmemjson"
 	"github.com/datawire/dlib/dlog"
 
-	"git.lukeshu.com/btrfs-progs-ng/lib/textui"
+	"git.lukeshu.com/btrfs-progs-ng/lib/streamio"
 )
 
-type runeScanner struct {
-	ctx            context.Context //nolint:containedctx // For detecting shutdown from methods
-	progress       textui.Portion[int64]
-	progressWriter *textui.Progress[textui.Portion[int64]]
-	unreadCnt      uint64
-	reader         *bufio.Reader
-	closer         io.Closer
-}
-
-func newRuneScanner(ctx context.Context, fh *os.File) (*runeScanner, error) {
-	fi, err := fh.Stat()
-	if err != nil {
-		return nil, err
-	}
-	ret := &runeScanner{
-		ctx: ctx,
-		progress: textui.Portion[int64]{
-			D: fi.Size(),
-		},
-		progressWriter: textui.NewProgress[textui.Portion[int64]](ctx, dlog.LogLevelInfo, textui.Tunable(1*time.Second)),
-		reader:         bufio.NewReader(fh),
-		closer:         fh,
-	}
-	return ret, nil
-}
-
-func (rs *runeScanner) ReadRune() (r rune, size int, err error) {
-	if err := rs.ctx.Err(); err != nil {
-		return 0, 0, err
-	}
-	r, size, err = rs.reader.ReadRune()
-	if rs.unreadCnt > 0 {
-		rs.unreadCnt--
-	} else {
-		rs.progress.N += int64(size)
-		rs.progressWriter.Set(rs.progress)
-	}
-	return
-}
-
-func (rs *runeScanner) UnreadRune() error {
-	if err := rs.ctx.Err(); err != nil {
-		return err
-	}
-	if err := rs.reader.UnreadRune(); err != nil {
-		return err
-	}
-	rs.unreadCnt++
-	return nil
-}
-
-func (rs *runeScanner) Close() error {
-	rs.progressWriter.Done()
-	return rs.closer.Close()
-}
-
 func readJSONFile[T any](ctx context.Context, filename string) (T, error) {
 	fh, err := os.Open(filename)
 	if err != nil {
 		var zero T
 		return zero, err
 	}
-	buf, err := newRuneScanner(dlog.WithField(ctx, "btrfs.read-json-file", filename), fh)
+	buf, err := streamio.NewRuneScanner(dlog.WithField(ctx, "btrfs.read-json-file", filename), fh)
 	defer func() {
 		_ = buf.Close()
 	}()
-- 
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