remove protobuf types (#51)

They are unused, so we can keep the generated output. Additionally this remove
a dependency on pbtypes.Timestamp

Author: sofiia-tesliuk

.travis.yml

@@ -1,7 +1,7 @@
 sudo: false
 language: go
 go:
-  - "1.12.x"
+  - "1.14.x"
 script:
   - GO111MODULE=on go get -t -v ./...
   - diff -u <(echo -n) <(gofmt -d -s .)

diff/diff.go

@@ -1,10 +1,64 @@
 package diff
 
-import "bytes"
+import (
+	"bytes"
+	"time"
+)
 
-// NOTE: types are code-generated in diff.pb.go.
+// A FileDiff represents a unified diff for a single file.
+//
+// A file unified diff has a header that resembles the following:
+//
+//   --- oldname	2009-10-11 15:12:20.000000000 -0700
+//   +++ newname	2009-10-11 15:12:30.000000000 -0700
+type FileDiff struct {
+	// the original name of the file
+	OrigName string
+	// the original timestamp (nil if not present)
+	OrigTime *time.Time
+	// the new name of the file (often same as OrigName)
+	NewName string
+	// the new timestamp (nil if not present)
+	NewTime *time.Time
+	// extended header lines (e.g., git's "new mode <mode>", "rename from <path>", etc.)
+	Extended []string
+	// hunks that were changed from orig to new
+	Hunks []*Hunk
+}
 
-//go:generate protoc -I../../../.. -I ../../../../github.com/gogo/protobuf/protobuf -I. --gogo_out=. diff.proto
+// A Hunk represents a series of changes (additions or deletions) in a file's
+// unified diff.
+type Hunk struct {
+	// starting line number in original file
+	OrigStartLine int32
+	// number of lines the hunk applies to in the original file
+	OrigLines int32
+	// if > 0, then the original file had a 'No newline at end of file' mark at this offset
+	OrigNoNewlineAt int32
+	// starting line number in new file
+	NewStartLine int32
+	// number of lines the hunk applies to in the new file
+	NewLines int32
+	// optional section heading
+	Section string
+	// 0-indexed line offset in unified file diff (including section headers); this is
+	// only set when Hunks are read from entire file diff (i.e., when ReadAllHunks is
+	// called) This accounts for hunk headers, too, so the StartPosition of the first
+	// hunk will be 1.
+	StartPosition int32
+	// hunk body (lines prefixed with '-', '+', or ' ')
+	Body []byte
+}
+
+// A Stat is a diff stat that represents the number of lines added/changed/deleted.
+type Stat struct {
+	// number of lines added
+	Added int32
+	// number of lines changed
+	Changed int32
+	// number of lines deleted
+	Deleted int32
+}
 
 // Stat computes the number of lines added/changed/deleted in all
 // hunks in this file's diff.