75 lines
1.3 KiB
Go
75 lines
1.3 KiB
Go
package ledger
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import (
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"io"
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"os"
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"time"
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)
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type File string
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func NewFile(p string) (File, error) {
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f := File(p)
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_, err := f.Deltas()
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return f, err
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}
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func (file File) Deltas(like ...Like) ([]Delta, error) {
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transactions, err := file.transactions()
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if err != nil {
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return nil, err
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}
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result := make([]Delta, 0, len(transactions)*2)
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for _, transaction := range transactions {
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sums := map[string]float64{}
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for _, acc := range transaction.recipients {
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sums[acc.currency] += acc.value
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delta := newDelta(
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transaction.date,
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transaction.description,
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acc.name,
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acc.value,
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acc.currency,
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)
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if likes(like).all(delta) {
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result = append(result, delta)
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}
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}
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for currency, value := range sums {
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delta := newDelta(
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transaction.date,
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transaction.description,
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transaction.payee,
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value,
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currency,
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)
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if likes(like).all(delta) {
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result = append(result, delta)
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}
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}
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}
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return result, nil
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}
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type transaction struct {
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date time.Time
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description string
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payee string
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recipients []transactionRecipient
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}
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type transactionRecipient struct {
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name string
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value float64
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currency string
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}
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func (file File) transactions() ([]transaction, error) {
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f, err := os.Open(string(file))
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if err != nil {
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return nil, err
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}
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defer f.Close()
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return nil, io.EOF
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}
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