lib/text: realign struct for better size allocation

The realignment reduce the cost of the following struct,

* Chunk: from 16 to 8 bytes (-8)
* struct in TestChunk_MarshalJSON: from 40 to 32 bytes (-8)
* diff.LineChange: from 96 to 88 bytes (-8)
* Line: from 16 to 8 bytes (-8)
* struct in TestLine_MarshalJSON: from 40 to 32 bytes (-8)

5 files changed, 13 insertions, 7 deletions

diff --git a/lib/text/chunk.go b/lib/text/chunk.go
index ddf2edc4..9a2db9e6 100644
--- a/lib/text/chunk.go
+++ b/lib/text/chunk.go
@@ -13,8 +13,8 @@ import (
 // Chunk represent subset of line, contain starting position and slice of
 // bytes in line.
 type Chunk struct {
-	StartAt int
 	V       []byte
+	StartAt int
 }
 
 // JoinChunks all chunk's values using `sep` as separator and return it as
diff --git a/lib/text/chunk_test.go b/lib/text/chunk_test.go
index 36f1cf8b..403d8c65 100644
--- a/lib/text/chunk_test.go
+++ b/lib/text/chunk_test.go
@@ -7,8 +7,8 @@ import (
 
 func TestChunk_MarshalJSON(t *testing.T) {
 	type testCase struct {
-		chunk Chunk
 		exp   string
+		chunk Chunk
 	}
 
 	var cases = []testCase{{
diff --git a/lib/text/diff/linechange.go b/lib/text/diff/linechange.go
index 0a659f9f..b9f18470 100644
--- a/lib/text/diff/linechange.go
+++ b/lib/text/diff/linechange.go
@@ -13,15 +13,21 @@ import (
 
 // LineChange represent one change in text.
 type LineChange struct {
-	Old  text.Line
-	New  text.Line
 	Adds text.Chunks
 	Dels text.Chunks
+
+	Old text.Line
+	New text.Line
 }
 
 // NewLineChange create a pointer to new LineChange object.
 func NewLineChange(old, new text.Line) *LineChange {
-	return &LineChange{old, new, text.Chunks{}, text.Chunks{}}
+	return &LineChange{
+		Adds: text.Chunks{},
+		Dels: text.Chunks{},
+		Old:  old,
+		New:  new,
+	}
 }
 
 // String return formatted content of LineChange.
diff --git a/lib/text/line.go b/lib/text/line.go
index 254fc0dc..a2cbbfee 100644
--- a/lib/text/line.go
+++ b/lib/text/line.go
@@ -12,8 +12,8 @@ import (
 
 // Line represent line number and slice of bytes as string.
 type Line struct {
-	N int
 	V []byte
+	N int
 }
 
 func (line Line) MarshalJSON() ([]byte, error) {
diff --git a/lib/text/line_test.go b/lib/text/line_test.go
index e4395592..dce2e040 100644
--- a/lib/text/line_test.go
+++ b/lib/text/line_test.go
@@ -7,8 +7,8 @@ import (
 
 func TestLine_MarshalJSON(t *testing.T) {
 	type testCase struct {
-		line Line
 		exp  string
+		line Line
 	}
 
 	var cases = []testCase{{