Initial implementation

Author: gbarr

date.go

@@ -0,0 +1,33 @@
+package pflagdate
+
+import (
+	date "github.com/hardfinhq/go-date"
+)
+
+type Date struct {
+	date.Date
+}
+
+// Implement pflag.Value interface
+
+// Type implements pflag.Value.Type().
+// Returns "Date".
+func (*Date) Type() string {
+	return "Date"
+}
+
+// String implements pflag.Value.String().
+// Returns date formatted as time.DateOnly.
+func (d *Date) String() string {
+	return d.Date.String()
+}
+
+// Set implements pflag.Value.Set().
+func (d *Date) Set(value string) error {
+	parsed, err := date.FromString(value)
+	if err != nil {
+		return err
+	}
+	d.Date = parsed
+	return nil
+}

date_test.go

@@ -0,0 +1,45 @@
+package pflagdate
+
+import (
+	"testing"
+	"time"
+
+	date "github.com/hardfinhq/go-date"
+	"github.com/spf13/pflag"
+)
+
+func TestDate(t *testing.T) {
+	dt := new(Date)
+
+	if dt.Type() != "Date" {
+		t.Errorf("unexpected type name %q", dt.Type())
+	}
+
+	flag := &pflag.Flag{
+		Name:      "date",
+		Shorthand: "d",
+		Usage:     "YYYY-MM-DD date",
+		Value:     dt,
+	}
+
+	pfs := pflag.NewFlagSet("test", pflag.ContinueOnError)
+	pfs.AddFlag(flag)
+
+	err := pfs.Parse([]string{"--date", "2001-03-06"})
+	if err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+
+	if !dt.Equal(date.NewDate(2001, time.March, 6)) {
+		t.Errorf("unexpected date: %s", dt)
+	}
+
+	if dt.String() != "2001-03-06" {
+		t.Errorf("unexpected date: %s", dt)
+	}
+
+	err2 := pfs.Parse([]string{"--date", "invalid"})
+	if err2 == nil {
+		t.Error("expected error, got nil")
+	}
+}

go.mod

@@ -0,0 +1,8 @@
+module github.com/gbarr/pflag-date
+
+go 1.23.2
+
+require (
+	github.com/hardfinhq/go-date v1.20240411.1
+	github.com/spf13/pflag v1.0.5
+)

go.sum

@@ -0,0 +1,12 @@
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/hardfinhq/go-date v1.20240411.1 h1:UskRXxgD+4eCEa8CpiiWLiv2/Vnf1eB90Bojkf7AQ64=
+github.com/hardfinhq/go-date v1.20240411.1/go.mod h1:7oxaI9XX4W3/MRDeQXec0fLXFnSJDS7BrazIY2XqPXA=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
+github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
+github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
+github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=