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alias.go
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alias.go
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package generator
import (
"encoding/gob"
"fmt"
"os"
"path/filepath"
"strings"
"github.com/brainicorn/skelp/skelputil"
)
const (
ErrAliasNotFound = "Alias '%s' not found in registry"
ErrInvalidAlias = "Invalid alias '%s'"
ErrInvalidAliasTemplate = "Invalid alias template: '%s' must be a filepath or url"
)
type aliasRegistry map[string]string
func (sg *SkelpGenerator) IDForAlias(alias string) (string, error) {
var err error
var templateID string
var found bool
if sg.aliases == nil {
_, err = sg.initAliasRegistry()
}
if err == nil {
templateID, found = sg.aliases[alias]
if !found {
err = fmt.Errorf(ErrAliasNotFound, alias)
}
}
return templateID, err
}
func (sg *SkelpGenerator) AddAlias(alias, fileOrUrl string) error {
var err error
var aliasFile string
var aliasPath string
if !IsAlias(alias) {
return fmt.Errorf(ErrInvalidAlias, alias)
}
if !IsFilePath(fileOrUrl) && !IsRepoURL(fileOrUrl) {
return fmt.Errorf(ErrInvalidAliasTemplate, fileOrUrl)
}
aliasFile, err = sg.initAliasRegistry()
if err == nil {
aliasPath = fileOrUrl
if IsFilePath(aliasPath) && !strings.HasPrefix(aliasPath, "file://") {
aliasPath, err = filepath.Abs(aliasPath)
}
if err == nil {
sg.aliases[alias] = aliasPath
}
}
return sg.saveAliases(aliasFile, err)
}
func (sg *SkelpGenerator) RemoveAlias(alias string) error {
var err error
var aliasPath string
if !IsAlias(alias) {
return fmt.Errorf(ErrInvalidAlias, alias)
}
aliasPath, err = sg.initAliasRegistry()
if err == nil {
delete(sg.aliases, alias)
}
return sg.saveAliases(aliasPath, err)
}
func (sg *SkelpGenerator) AliasMap() (map[string]string, error) {
var err error
_, err = sg.initAliasRegistry()
return sg.aliases, err
}
func (sg *SkelpGenerator) saveAliases(path string, initialErr error) error {
var err error
var file *os.File
aliases := aliasRegistry{}
err = initialErr
if err == nil {
if sg.aliases != nil {
aliases = sg.aliases
}
file, err = os.Create(path)
}
if err == nil {
encoder := gob.NewEncoder(file)
sg.mu.Lock()
encoder.Encode(aliases)
sg.mu.Unlock()
}
file.Close()
return err
}
func (sg *SkelpGenerator) loadAliases(path string) error {
var err error
var file *os.File
if sg.aliases == nil {
file, err = os.Open(path)
if err == nil {
decoder := gob.NewDecoder(file)
sg.mu.Lock()
err = decoder.Decode(&sg.aliases)
sg.mu.Unlock()
}
file.Close()
}
return err
}
func (sg *SkelpGenerator) initAliasRegistry() (string, error) {
var err error
var skelpHome, aliasesPath string
skelpHome, err = sg.InitSkelpHome()
if err == nil {
aliasesPath = filepath.Join(skelpHome, skelpAliasesFilename)
if !skelputil.PathExists(aliasesPath) {
err = sg.saveAliases(aliasesPath, err)
}
if err == nil {
err = sg.loadAliases(aliasesPath)
}
}
return aliasesPath, err
}