refactor: replace gitdiff with external package

1 files changed, 0 insertions, 142 deletions

diff --git a/internal/gitdiff/parser.go b/internal/gitdiff/parser.go
deleted file mode 100644
index e8f8430..0000000
--- a/internal/gitdiff/parser.go
+++ /dev/null
@@ -1,142 +0,0 @@
-// Package gitdiff parses and applies patches generated by Git. It supports
-// line-oriented text patches, binary patches, and can also parse standard
-// unified diffs generated by other tools.
-package gitdiff
-
-import (
-	"bufio"
-	"fmt"
-	"io"
-)
-
-// Parse parses a patch with changes to one or more files. Any content before
-// the first file is returned as the second value. If an error occurs while
-// parsing, it returns all files parsed before the error.
-//
-// Parse expects to receive a single patch. If the input may contain multiple
-// patches (for example, if it is an mbox file), callers should split it into
-// individual patches and call Parse on each one.
-func Parse(r io.Reader) ([]*File, string, error) {
-	p := newParser(r)
-
-	if err := p.Next(); err != nil {
-		if err == io.EOF {
-			return nil, "", nil
-		}
-		return nil, "", err
-	}
-
-	var preamble string
-	var files []*File
-	for {
-		file, pre, err := p.ParseNextFileHeader()
-		if err != nil {
-			return files, preamble, err
-		}
-		if len(files) == 0 {
-			preamble = pre
-		}
-		if file == nil {
-			break
-		}
-
-		for _, fn := range []func(*File) (int, error){
-			p.ParseTextFragments,
-			p.ParseBinaryFragments,
-		} {
-			n, err := fn(file)
-			if err != nil {
-				return files, preamble, err
-			}
-			if n > 0 {
-				break
-			}
-		}
-
-		files = append(files, file)
-	}
-
-	return files, preamble, nil
-}
-
-// TODO(bkeyes): consider exporting the parser type with configuration
-// this would enable OID validation, p-value guessing, and prefix stripping
-// by allowing users to set or override defaults
-
-// parser invariants:
-// - methods that parse objects:
-//     - start with the parser on the first line of the first object
-//     - if returning nil, do not advance
-//     - if returning an error, do not advance past the object
-//     - if returning an object, advance to the first line after the object
-// - any exported parsing methods must initialize the parser by calling Next()
-
-type stringReader interface {
-	ReadString(delim byte) (string, error)
-}
-
-type parser struct {
-	r stringReader
-
-	eof    bool
-	lineno int64
-	lines  [3]string
-}
-
-func newParser(r io.Reader) *parser {
-	if r, ok := r.(stringReader); ok {
-		return &parser{r: r}
-	}
-	return &parser{r: bufio.NewReader(r)}
-}
-
-// Next advances the parser by one line. It returns any error encountered while
-// reading the line, including io.EOF when the end of stream is reached.
-func (p *parser) Next() error {
-	if p.eof {
-		return io.EOF
-	}
-
-	if p.lineno == 0 {
-		// on first call to next, need to shift in all lines
-		for i := 0; i < len(p.lines)-1; i++ {
-			if err := p.shiftLines(); err != nil && err != io.EOF {
-				return err
-			}
-		}
-	}
-
-	err := p.shiftLines()
-	if err != nil && err != io.EOF {
-		return err
-	}
-
-	p.lineno++
-	if p.lines[0] == "" {
-		p.eof = true
-		return io.EOF
-	}
-	return nil
-}
-
-func (p *parser) shiftLines() (err error) {
-	for i := 0; i < len(p.lines)-1; i++ {
-		p.lines[i] = p.lines[i+1]
-	}
-	p.lines[len(p.lines)-1], err = p.r.ReadString('\n')
-	return
-}
-
-// Line returns a line from the parser without advancing it. A delta of 0
-// returns the current line, while higher deltas return read-ahead lines. It
-// returns an empty string if the delta is higher than the available lines,
-// either because of the buffer size or because the parser reached the end of
-// the input. Valid lines always contain at least a newline character.
-func (p *parser) Line(delta uint) string {
-	return p.lines[delta]
-}
-
-// Errorf generates an error and appends the current line information.
-func (p *parser) Errorf(delta int64, msg string, args ...interface{}) error {
-	return fmt.Errorf("gitdiff: line %d: %s", p.lineno+delta, fmt.Sprintf(msg, args...))
-}