tmpl/registry/template.go

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package registry
import (
"bytes"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strings"
"text/template"
"time"
"github.com/mholt/archiver/v3"
)
// 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, overwrite 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
}
prompts, err := prompt(tmp, defaults)
if err != nil {
return err
}
funcs := mergeMaps(funcMap, prompts.ToFuncMap())
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
}
newDest := strings.TrimPrefix(walkPath, base+"/")
newDest = filepath.Join(dest, newDest)
tmplDest, err := template.New("dest").Funcs(funcs).Parse(newDest)
if err != nil {
return err
}
var buf bytes.Buffer
if err := tmplDest.Execute(&buf, prompts.ToMap()); err != nil {
return err
}
newDest = buf.String()
if err := os.MkdirAll(filepath.Dir(newDest), os.ModePerm); err != nil {
return err
}
oldFi, err := os.Lstat(walkPath)
if err != nil {
return err
}
// Check if new file exists. If it does, only skip if not overwriting
if _, err := os.Lstat(newDest); err == nil && !overwrite {
return nil
}
newFi, err := os.OpenFile(newDest, os.O_RDWR|os.O_CREATE|os.O_TRUNC, oldFi.Mode())
if err != nil {
return err
}
tmplContents, err := template.New("tmpl").Funcs(funcs).Parse(string(contents))
if err != nil {
return err
}
if err := tmplContents.Execute(newFi, prompts.ToMap()); err != nil {
return err
}
return newFi.Close()
})
}
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
}