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template.go
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template.go
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package docsite
import (
"context"
"fmt"
"html/template"
"io/ioutil"
"net/http"
"net/url"
"os"
"strings"
"github.com/pkg/errors"
"github.com/sourcegraph/docsite/markdown"
)
const (
rootTemplateName = "root"
documentTemplateName = "document"
searchTemplateName = "search"
)
func (s *Site) getTemplate(templatesFS http.FileSystem, name string, extraFuncs template.FuncMap) (*template.Template, error) {
readFile := func(fs http.FileSystem, path string) ([]byte, error) {
f, err := fs.Open(path)
if err != nil {
return nil, err
}
defer f.Close()
data, err := ioutil.ReadAll(f)
if err != nil {
return nil, err
}
return data, nil
}
tmpl := template.New(rootTemplateName)
tmpl.Funcs(template.FuncMap{
"asset": func(path string) string {
return s.AssetsBase.ResolveReference(&url.URL{Path: path}).String()
},
"assetsFromVersion": func(version, path string) string {
return s.AssetsBase.ResolveReference(&url.URL{Path: path, RawQuery: version}).String()
},
"contentFileExists": func(version, path string) bool {
fs, err := s.Content.OpenVersion(context.Background(), version)
if err != nil {
return false
}
f, err := fs.Open(path)
// Treat all errors as "not-exists".
if f != nil {
f.Close()
}
return err == nil
},
"renderMarkdownContentFile": func(version, path string) (template.HTML, error) {
fs, err := s.Content.OpenVersion(context.Background(), version)
if err != nil {
return "", err
}
data, err := readFile(fs, path)
if err != nil {
return "", err
}
doc, err := markdown.Run(data, s.markdownOptions(path, version))
if err != nil {
return "", err
}
return template.HTML(doc.HTML), nil
},
"subtract": func(a, b int) int { return a - b },
"replace": strings.Replace,
"trimPrefix": strings.TrimPrefix,
"contains": strings.Contains,
"hasRootURL": func() bool {
return s.Root != nil
},
"absURL": func(path string) string {
if s.Root != nil {
url := *s.Root
url.Path = path
return url.String()
}
return path
},
})
tmpl.Funcs(extraFuncs)
// Read root and named template files.
names := []string{rootTemplateName, name}
for _, name := range names {
path := "/" + name + ".html"
data, err := ReadFile(templatesFS, path)
if name == rootTemplateName && os.IsNotExist(err) {
continue
}
if err != nil {
return nil, errors.WithMessage(err, fmt.Sprintf("read template %s", path))
}
if _, err := tmpl.Parse(string(data)); err != nil {
return nil, errors.WithMessage(err, fmt.Sprintf("parse template %s", path))
}
}
return tmpl, nil
}