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linker.go
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/
linker.go
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package flags
import (
"bytes"
"fmt"
"net/url"
"path"
"strings"
"text/template"
"github.com/johnstarich/go/gopages/internal/generate/source"
)
// GoPagesLinker is the default GoPages source.Linker, which links to scraped godoc source pages
type GoPagesLinker struct {
baseURL string
}
func newGoPagesLinker(baseURL string) *GoPagesLinker {
return &GoPagesLinker{
baseURL: baseURL,
}
}
// LinkToSource implements source.Linker
func (l *GoPagesLinker) LinkToSource(packagePath string, options source.LinkOptions) url.URL {
u := url.URL{
Path: path.Join(l.baseURL, "/src", packagePath),
}
if path.Ext(u.Path) == ".go" {
u.Path += ".html"
}
if options.Line > 0 {
u.Fragment = fmt.Sprintf("L%d", options.Line)
}
return u
}
// TemplateLinker is a custom template-based source.Linker, which links to external source pages
type TemplateLinker struct {
template *template.Template
modulePackage string
}
var _ source.Linker = &TemplateLinker{}
var _ source.ScrapeChecker = &TemplateLinker{}
func newTemplateLinker(modulePackageURL, tmpl string) (*TemplateLinker, error) {
var l TemplateLinker
modulePackage, err := url.Parse(modulePackageURL)
if err == nil {
l.modulePackage = path.Join(modulePackage.Host, modulePackage.Path)
l.template, err = template.New("").Parse(tmpl)
}
return &l, err
}
// LinkToSource implements source.Linker
func (l *TemplateLinker) LinkToSource(packagePath string, options source.LinkOptions) url.URL {
filePath := strings.TrimPrefix(packagePath, l.modulePackage)
filePath = strings.TrimPrefix(filePath, "/")
if filePath == packagePath {
return url.URL{}
}
var args = struct {
Path string
source.LinkOptions
}{
Path: filePath,
LinkOptions: options,
}
var buf bytes.Buffer
err := l.template.Execute(&buf, args)
panicIfErr(err)
var u url.URL
err = u.UnmarshalBinary(buf.Bytes())
panicIfErr(err)
return u
}
// ShouldScrapePackage implements source.ScrapeChecker
func (l *TemplateLinker) ShouldScrapePackage(packagePath string) bool {
return strings.HasPrefix(packagePath, l.modulePackage+"/")
}
func panicIfErr(err error) {
if err != nil {
panic(err)
}
}