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template.go
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183 lines (150 loc) · 3.33 KB
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package main
import (
"bytes"
"encoding/xml"
"io"
"io/ioutil"
"net/http"
"regexp"
"strings"
"text/template"
)
var (
prefix, suffix *template.Template
templateBuffer bytes.Buffer
whitespace = regexp.MustCompile(`^(\s*)`)
)
func init() {
load := func(name string) *template.Template {
f, _ := assets.Open(name)
defer f.Close()
b, _ := ioutil.ReadAll(f)
return template.Must(template.New(name).Parse(string(b)))
}
prefix = load("prefix.tmpl")
suffix = load("suffix.tmpl")
}
type Document struct {
Type string `xml:"type,attr"`
Options string `xml:"options,attr"`
Prefix string `xml:"prefix"`
Suffix string `xml:"suffix"`
Preamble string `xml:"preamble"`
}
type Package struct {
Name string `xml:"name,attr"`
Options string `xml:"options,attr"`
}
type Asset struct {
Path string `xml:"path,attr"`
Base64 []byte `xml:",innerxml"`
}
type Template struct {
XMLName xml.Name `xml:"template"`
Document Document `xml:"document"`
Packages []Package `xml:"packages>package"`
Assets []Asset `xml:"assets>asset"`
}
func ReadTemplate(r io.Reader) (*Template, error) {
var t Template
return &t, xml.NewDecoder(r).Decode(&t)
}
func GetTemplate(fs *Filesystem, base, src string) (*Template, error) {
var (
r io.ReadCloser
err error
)
switch {
case src == "":
r, err = assets.Open("default.xml")
case strings.HasPrefix(src, "http://") || strings.HasPrefix(src, "https://"):
res, _err := http.Get(src)
r, err = res.Body, _err
default:
r, err = fs.Open(RelativePath(base, src))
}
if err != nil {
return nil, err
}
defer r.Close()
return ReadTemplate(r)
}
func (t *Template) AddPackage(p Package) {
for _, k := range t.Packages {
if k.Name == p.Name {
return
}
}
t.Packages = append(t.Packages, p)
}
func (t *Template) ApplyMeta(m Meta) error {
t.Document.Preamble = trimIndentation(t.Document.Preamble)
t.Document.Prefix = trimIndentation(t.Document.Prefix)
t.Document.Suffix = trimIndentation(t.Document.Suffix)
var (
err error
s = []*string{
&t.Document.Preamble,
&t.Document.Prefix,
&t.Document.Suffix,
&t.Document.Options,
&t.Document.Type,
}
)
for _, v := range s {
*v, err = execTextTemplate(*v, m)
if err != nil {
return err
}
}
for i, p := range t.Packages {
p.Name, err = execTextTemplate(p.Name, m)
if err != nil {
return err
}
p.Options, err = execTextTemplate(p.Options, m)
if err != nil {
return err
}
t.Packages[i] = p
}
return nil
}
func (t *Template) WritePrefix(w io.Writer) error {
return prefix.Execute(w, t)
}
func (t *Template) WriteSuffix(w io.Writer) error {
return suffix.Execute(w, t)
}
func execTextTemplate(tmpl string, values map[string]string) (string, error) {
t, err := template.New("inline").Parse(tmpl)
if err != nil {
return "", err
}
templateBuffer.Reset()
err = t.Execute(&templateBuffer, values)
if err != nil {
return "", err
}
return templateBuffer.String(), nil
}
func trimIndentation(text string) string {
if text == "" {
return text
}
lines, ind := strings.Split(text, "\n"), ""
for _, l := range lines {
if strings.TrimSpace(l) != "" {
pind := whitespace.FindString(l)
if ind == "" || len(pind) < len(ind) {
ind = pind
}
}
}
for i, l := range lines {
if strings.HasPrefix(l, ind) {
lines[i] = l[len(ind):]
}
}
return strings.Join(lines, "\n")
}