todo

src/ledger/file.go

@@ -25,6 +25,10 @@ func NewFiles(p string, q ...string) (Files, error) {
 	return f, err
 }
 
+func (files Files) Amend(old, now Delta) error {
+	return io.EOF
+}
+
 func (files Files) TempGetLastNLines(n int) ([]string, error) {
 	p := files.paths()[0]
 	f, err := os.Open(p)
@@ -143,11 +147,13 @@ func (files Files) Add(payee string, delta Delta) error {
 }
 
 func (files Files) append(s string) error {
-	if err := files.trimTrainlingWhitespace(); err != nil {
+	p := path.Join(path.Dir(files.paths()[0]), "inbox.txt")
+
+	if err := files.trimTrailingWhitespace(p); err != nil {
 		return err
 	}
 
-	f, err := os.OpenFile(string(files.paths()[0]), os.O_APPEND|os.O_CREATE|os.O_WRONLY, os.ModePerm)
+	f, err := os.OpenFile(p, os.O_APPEND|os.O_CREATE|os.O_WRONLY, os.ModePerm)
 	if err != nil {
 		return err
 	}
@@ -157,8 +163,8 @@ func (files Files) append(s string) error {
 	return f.Close()
 }
 
-func (files Files) trimTrainlingWhitespace() error {
-	idx, err := files._lastNonWhitespacePos()
+func (files Files) trimTrailingWhitespace(p string) error {
+	idx, err := files._lastNonWhitespacePos(p)
 	if err != nil {
 		return err
 	}
@@ -166,7 +172,7 @@ func (files Files) trimTrainlingWhitespace() error {
 		return nil
 	}
 
-	f, err := os.OpenFile(string(files.paths()[0]), os.O_CREATE|os.O_WRONLY, os.ModePerm)
+	f, err := os.OpenFile(p, os.O_CREATE|os.O_WRONLY, os.ModePerm)
 	if err != nil {
 		return err
 	}
@@ -175,8 +181,8 @@ func (files Files) trimTrainlingWhitespace() error {
 	return f.Truncate(int64(idx + 1))
 }
 
-func (files Files) _lastNonWhitespacePos() (int, error) {
-	f, err := os.Open(string(files.paths()[0]))
+func (files Files) _lastNonWhitespacePos(p string) (int, error) {
+	f, err := os.Open(p)
 	if os.IsNotExist(err) {
 		return -1, nil
 	}

src/ledger/file_test.go

@@ -10,6 +10,15 @@ import (
 	"testing"
 )
 
+func TestFileAmend(t *testing.T) {
+	// given real xaction
+	// find it
+	// invert it
+	// modify original delta to requested
+	// modify counterpart
+	// inbox.txt has xaction inverted and xaction'
+}
+
 func TestFileAdd(t *testing.T) {
 	filesAppendDelim = " "
 	payee := "name:3"
@@ -70,7 +79,7 @@ func TestFileAdd(t *testing.T) {
 	for name, d := range cases {
 		c := d
 		t.Run(name, func(t *testing.T) {
-			p := path.Join(t.TempDir(), "input")
+			p := path.Join(t.TempDir(), "inbox.txt")
 			if c.given != nil {
 				if err := os.WriteFile(p, []byte(c.given), os.ModePerm); err != nil {
 					t.Fatal(err)

src/ledger/like.go

@@ -8,6 +8,12 @@ type Like func(Delta) bool
 
 type Likes []Like
 
+func LikeTransaction(delta Delta) Like {
+	return func(d Delta) bool {
+		return d.transaction == delta.transaction
+	}
+}
+
 func LikeBefore(date string) Like {
 	return func(d Delta) bool {
 		return date >= d.Date