From 078c425d9ed8d6ba9b2e6a3356100c9cdb61e75b Mon Sep 17 00:00:00 2001
From: bel <bel@bel.bel>
Date: Sun, 22 Oct 2023 22:03:26 -0600
Subject: [PATCH] someday

---
 ana/ana.go      |  1 +
 go.mod          |  7 +++++++
 go.sum          |  6 ++++++
 ledger/delta.go | 38 ++++++++++++++++++++++++++++++++++++++
 ledger/file.go  | 41 +++++++++++++++++++++++++++++++++++++++++
 ledger/like.go  | 15 +++++++++++++++
 6 files changed, 108 insertions(+)
 create mode 100644 ana/ana.go
 create mode 100644 go.sum
 create mode 100644 ledger/delta.go
 create mode 100644 ledger/file.go
 create mode 100644 ledger/like.go

diff --git a/ana/ana.go b/ana/ana.go
new file mode 100644
index 0000000..227ada8
--- /dev/null
+++ b/ana/ana.go
@@ -0,0 +1 @@
+package ana
diff --git a/go.mod b/go.mod
index 3ad49a2..2568b13 100644
--- a/go.mod
+++ b/go.mod
@@ -1,3 +1,10 @@
 module gogs.inhome.blapointe.com/ana-ledger
 
 go 1.21.1
+
+require github.com/howeyc/ledger v1.15.1
+
+require (
+	github.com/alfredxing/calc v0.0.0-20180827002445-77daf576f976 // indirect
+	github.com/joyt/godate v0.0.0-20150226210126-7151572574a7 // indirect
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..a9fe5ec
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,6 @@
+github.com/alfredxing/calc v0.0.0-20180827002445-77daf576f976 h1:+jyVKPjl5Y39thM0ZlVrRqKjSO/Upr5tP9ZQGELv8gw=
+github.com/alfredxing/calc v0.0.0-20180827002445-77daf576f976/go.mod h1:/HQknSiD7YKT15DoHXuiXezQfNPBUm8PeqFaTxeA3HU=
+github.com/howeyc/ledger v1.15.1 h1:KmCnRrhPJS/eRMqMZqAX3lMrIQumkHPCs3cAvo/dsTs=
+github.com/howeyc/ledger v1.15.1/go.mod h1:FwnBqmXCItQpDvsDnLmw7JAhvZdoLGqQpfm/gT5YtHA=
+github.com/joyt/godate v0.0.0-20150226210126-7151572574a7 h1:2wH5antjhmU3EuWyidm0lJ4B9hGMpl5lNRo+M9uGJ5A=
+github.com/joyt/godate v0.0.0-20150226210126-7151572574a7/go.mod h1:R+UgFL3iylLhx9N4w35zZ2HdhDlgorRDx4SxbchWuN0=
diff --git a/ledger/delta.go b/ledger/delta.go
new file mode 100644
index 0000000..8fc6509
--- /dev/null
+++ b/ledger/delta.go
@@ -0,0 +1,38 @@
+package ledger
+
+import (
+	"time"
+
+	"github.com/howeyc/ledger"
+)
+
+type Currency string
+
+const (
+	USD = Currency("$")
+)
+
+type Delta struct {
+	Date     time.Time
+	Account  string
+	Value    float64
+	Currency Currency
+}
+
+func newDeltas(t *ledger.Transaction) []Delta {
+	result := make([]Delta, len(t.AccountChanges))
+	for i, a := range t.AccountChanges {
+		result[i] = newDelta(t.Date, a)
+	}
+	return result
+}
+
+func newDelta(d time.Time, a ledger.Account) Delta {
+	value, _ := a.Balance.Float64()
+	return Delta{
+		Date:     d,
+		Account:  a.Name,
+		Value:    value,
+		Currency: USD, // TODO
+	}
+}
diff --git a/ledger/file.go b/ledger/file.go
new file mode 100644
index 0000000..3d94f87
--- /dev/null
+++ b/ledger/file.go
@@ -0,0 +1,41 @@
+package ledger
+
+import (
+	"github.com/howeyc/ledger"
+)
+
+type File string
+
+func NewFile(p string) (File, error) {
+	f := File(p)
+	_, err := f.Deltas()
+	return f, err
+}
+
+func (file File) Deltas(likes ...Like) ([]Delta, error) {
+	transactions, err := file.transactions()
+	if err != nil {
+		return nil, err
+	}
+	result := make([]Delta, 0, len(transactions)*2)
+	for _, transaction := range transactions {
+		for _, delta := range newDeltas(transaction) {
+			if got := func() bool {
+				for _, like := range likes {
+					if !like(delta) {
+						return false
+					}
+				}
+				return true
+			}(); !got {
+				continue
+			}
+			result = append(result, delta)
+		}
+	}
+	return result, nil
+}
+
+func (file File) transactions() ([]*ledger.Transaction, error) {
+	return ledger.ParseLedgerFile(string(file))
+}
diff --git a/ledger/like.go b/ledger/like.go
new file mode 100644
index 0000000..3a88a5b
--- /dev/null
+++ b/ledger/like.go
@@ -0,0 +1,15 @@
+package ledger
+
+import "regexp"
+
+type Like func(Delta) bool
+
+func LikeAcc(pattern string) Like {
+	return func(d Delta) bool {
+		return like(pattern, d.Account)
+	}
+}
+
+func like(pattern string, other string) bool {
+	return regexp.MustCompile(pattern).MatchString(other)
+}