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package registry
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"sort"
"strings"
"text/template"
"time"
"github.com/AlecAivazis/survey/v2"
"github.com/mholt/archiver/v3"
"github.com/pelletier/go-toml"
)
// Template is a tmpl project
type Template struct {
reg *Registry `toml:"-"`
Name string `toml:"name"`
Path string `toml:"path"`
Repository string `toml:"repository"`
Branch string `toml:"branch"`
Created time.Time `toml:"created"`
}
// ArchiveName is the name given to the archive for this Template
func (t *Template) ArchiveName() string {
return fmt.Sprintf("%s.tar.gz", t.Name)
}
// ArchivePath is the full path to the archive for this Template within the Registry
func (t *Template) ArchivePath() string {
return filepath.Join(t.reg.dir, t.ArchiveName())
}
// Execute runs the Template and copies to dest
func (t *Template) Execute(dest string, defaults bool) error {
tmp, err := ioutil.TempDir(os.TempDir(), "tmpl")
if err != nil {
return err
}
defer os.RemoveAll(tmp)
if err := archiver.Unarchive(t.ArchivePath(), tmp); err != nil {
return err
}
vars, err := prompt(tmp, defaults)
if err != nil {
return err
}
base := filepath.Join(tmp, "template")
return filepath.Walk(base, func(walkPath string, walkInfo os.FileInfo, walkErr error) error {
if walkErr != nil {
return walkErr
}
if walkInfo.IsDir() {
return nil
}
contents, err := ioutil.ReadFile(walkPath)
if err != nil {
return err
}
tmpl, err := template.New("tmpl").Funcs(mergeMaps(funcMap, convertMap(vars))).Parse(string(contents))
if err != nil {
return err
}
newDest := strings.TrimPrefix(walkPath, base+"/")
newDest = filepath.Join(dest, newDest)
if err := os.MkdirAll(filepath.Dir(newDest), os.ModePerm); err != nil {
return err
}
oldFi, err := os.Lstat(walkPath)
if err != nil {
return err
}
newFi, err := os.OpenFile(newDest, os.O_RDWR|os.O_CREATE|os.O_TRUNC, oldFi.Mode())
if err != nil {
return err
}
if err := tmpl.Execute(newFi, vars); err != nil {
return err
}
return newFi.Close()
})
}
func prompt(dir string, defaults bool) (map[string]interface{}, error) {
templatePath := filepath.Join(dir, "template.toml")
if _, err := os.Lstat(templatePath); err != nil {
return nil, err
}
tree, err := toml.LoadFile(templatePath)
if err != nil {
return nil, err
}
vars := tree.ToMap()
// Return early if we only want defaults
if defaults {
return vars, nil
}
// Sort the map keys so they are consistent
sorted := make([]string, 0, len(vars))
for k := range vars {
sorted = append(sorted, k)
}
sort.Strings(sorted)
for _, k := range sorted {
v := vars[k]
var p survey.Prompt
switch t := v.(type) {
case []string:
p = &survey.Select{
Message: k,
Options: t,
}
default:
p = &survey.Input{
Message: k,
Default: fmt.Sprintf("%v", t),
}
}
q := []*survey.Question{
{
Name: "response",
Prompt: p,
Validate: survey.Required,
},
}
a := struct {
Response string
}{}
if err := survey.Ask(q, &a); err != nil {
return nil, err
}
vars[k] = a.Response
}
return vars, nil
}
func convertMap(m map[string]interface{}) template.FuncMap {
mm := make(template.FuncMap)
for k, v := range m {
vv := v // Enclosures in a loop
mm[k] = func() interface{} {
return fmt.Sprintf("%v", vv)
}
}
return mm
}
func mergeMaps(maps ...map[string]interface{}) map[string]interface{} {
m := make(map[string]interface{})
for _, mm := range maps {
for k, v := range mm {
m[k] = v
}
}
return m
}
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