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eget/meta/meta.go

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package meta
import (
"encoding/json"
"errors"
"fmt"
"os"
"strings"
"github.com/adrg/xdg"
)
type Meta struct {
Packages []Package `json:"packages"`
}
type Package struct {
Name string `json:"name"`
Version string `json:"version"`
}
func Add(pkg Package) error {
m, err := Read()
if err != nil {
return err
}
for _, p := range m.Packages {
if strings.EqualFold(pkg.Name, p.Name) {
return errors.New("package already exists locally")
}
}
m.Packages = append(m.Packages, pkg)
return save(m)
}
func Read() (Meta, error) {
var m Meta
fp, err := metaPath()
if err != nil {
return m, fmt.Errorf("could not get meta file: %w", err)
}
fi, err := os.Open(fp)
if err != nil {
return m, fmt.Errorf("could not open meta file: %w", err)
}
defer fi.Close()
if err := json.NewDecoder(fi).Decode(&m); err != nil {
return m, fmt.Errorf("could not decode meta: %w", err)
}
return m, nil
}
func Remove(name string) error {
m, err := Read()
if err != nil {
return err
}
for idx, p := range m.Packages {
if strings.EqualFold(name, p.Name) {
m.Packages = append(m.Packages[:idx], m.Packages[idx+1:]...)
return save(m)
}
}
return fmt.Errorf("could not find package to remove for %q", name)
}
func metaPath() (string, error) {
return xdg.DataFile("eget/meta.json")
}
func save(m Meta) error {
fp, err := metaPath()
if err != nil {
return fmt.Errorf("could not get meta path: %w", err)
}
fi, err := os.Create(fp)
if err != nil {
return fmt.Errorf("could not create meta file: %w", err)
}
defer fi.Close()
return json.NewEncoder(fi).Encode(m)
}