1 files changed, 0 insertions, 158 deletions
diff --git a/pkg/gitdiff/apply_text.go b/pkg/gitdiff/apply_text.go
deleted file mode 100644
index 8d0accb..0000000
--- a/pkg/gitdiff/apply_text.go
+++ /dev/null
@@ -1,158 +0,0 @@
-package gitdiff
-
-import (
-	"errors"
-	"io"
-)
-
-// TextApplier applies changes described in text fragments to source data. If
-// changes are described in multiple fragments, those fragments must be applied
-// in order. The applier must be closed after use.
-//
-// By default, TextApplier operates in "strict" mode, where fragment content
-// and positions must exactly match those of the source.
-type TextApplier struct {
-	dst      io.Writer
-	src      io.ReaderAt
-	lineSrc  LineReaderAt
-	nextLine int64
-
-	closed bool
-	dirty  bool
-}
-
-// NewTextApplier creates a TextApplier that reads data from src and writes
-// modified data to dst. If src implements LineReaderAt, it is used directly.
-func NewTextApplier(dst io.Writer, src io.ReaderAt) *TextApplier {
-	a := TextApplier{
-		dst: dst,
-		src: src,
-	}
-
-	if lineSrc, ok := src.(LineReaderAt); ok {
-		a.lineSrc = lineSrc
-	} else {
-		a.lineSrc = &lineReaderAt{r: src}
-	}
-
-	return &a
-}
-
-// ApplyFragment applies the changes in the fragment f, writing unwritten data
-// before the start of the fragment and any changes from the fragment. If
-// multiple text fragments apply to the same content, ApplyFragment must be
-// called in order of increasing start position. As a result, each fragment can
-// be applied at most once.
-//
-// If an error occurs while applying, ApplyFragment returns an *ApplyError that
-// annotates the error with additional information. If the error is because of
-// a conflict between the fragment and the source, the wrapped error will be a
-// *Conflict.
-func (a *TextApplier) ApplyFragment(f *TextFragment) error {
-	if a.closed {
-		return applyError(errApplierClosed)
-	}
-
-	// mark an apply as in progress, even if it fails before making changes
-	a.dirty = true
-
-	// application code assumes fragment fields are consistent
-	if err := f.Validate(); err != nil {
-		return applyError(err)
-	}
-
-	// lines are 0-indexed, positions are 1-indexed (but new files have position = 0)
-	fragStart := f.OldPosition - 1
-	if fragStart < 0 {
-		fragStart = 0
-	}
-	fragEnd := fragStart + f.OldLines
-
-	start := a.nextLine
-	if fragStart < start {
-		return applyError(&Conflict{"fragment overlaps with an applied fragment"})
-	}
-
-	if f.OldPosition == 0 {
-		ok, err := isLen(a.src, 0)
-		if err != nil {
-			return applyError(err)
-		}
-		if !ok {
-			return applyError(&Conflict{"cannot create new file from non-empty src"})
-		}
-	}
-
-	preimage := make([][]byte, fragEnd-start)
-	n, err := a.lineSrc.ReadLinesAt(preimage, start)
-	if err != nil {
-		// an EOF indicates that source file is shorter than the patch expects,
-		// which should be reported as a conflict rather than a generic error
-		if errors.Is(err, io.EOF) {
-			err = &Conflict{"src has fewer lines than required by fragment"}
-		}
-		return applyError(err, lineNum(start+int64(n)))
-	}
-
-	// copy leading data before the fragment starts
-	for i, line := range preimage[:fragStart-start] {
-		if _, err := a.dst.Write(line); err != nil {
-			a.nextLine = start + int64(i)
-			return applyError(err, lineNum(a.nextLine))
-		}
-	}
-	preimage = preimage[fragStart-start:]
-
-	// apply the changes in the fragment
-	used := int64(0)
-	for i, line := range f.Lines {
-		if err := applyTextLine(a.dst, line, preimage, used); err != nil {
-			a.nextLine = fragStart + used
-			return applyError(err, lineNum(a.nextLine), fragLineNum(i))
-		}
-		if line.Old() {
-			used++
-		}
-	}
-	a.nextLine = fragStart + used
-
-	// new position of +0,0 mean a full delete, so check for leftovers
-	if f.NewPosition == 0 && f.NewLines == 0 {
-		var b [1][]byte
-		n, err := a.lineSrc.ReadLinesAt(b[:], a.nextLine)
-		if err != nil && err != io.EOF {
-			return applyError(err, lineNum(a.nextLine))
-		}
-		if n > 0 {
-			return applyError(&Conflict{"src still has content after full delete"}, lineNum(a.nextLine))
-		}
-	}
-
-	return nil
-}
-
-func applyTextLine(dst io.Writer, line Line, preimage [][]byte, i int64) (err error) {
-	if line.Old() && string(preimage[i]) != line.Line {
-		return &Conflict{"fragment line does not match src line"}
-	}
-	if line.New() {
-		_, err = io.WriteString(dst, line.Line)
-	}
-	return err
-}
-
-// Close writes any data following the last applied fragment and prevents
-// future calls to ApplyFragment.
-func (a *TextApplier) Close() (err error) {
-	if a.closed {
-		return nil
-	}
-
-	a.closed = true
-	if !a.dirty {
-		_, err = copyFrom(a.dst, a.src, 0)
-	} else {
-		_, err = copyLinesFrom(a.dst, a.lineSrc, a.nextLine)
-	}
-	return err
-}