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146 lines
2.8 KiB
Go
146 lines
2.8 KiB
Go
package main
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import (
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"html/template"
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"io"
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"io/fs"
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"path/filepath"
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"strings"
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txttmpl "text/template"
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)
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// Options for getting a template tree
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type Options struct {
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Globs []string
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Prefix string
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Suffix string
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Root string
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Funcs map[string]interface{}
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}
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func (o Options) getRoot() string {
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if o.Root == "" {
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return "."
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}
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return o.Root
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}
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func (o Options) matchesGlob(path string) (bool, error) {
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if len(o.Globs) == 0 {
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return true, nil
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}
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for _, glob := range o.Globs {
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ok, err := filepath.Match(glob, path)
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if err != nil {
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return false, err
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}
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if ok {
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return true, nil
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}
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}
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return false, nil
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}
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func (o Options) trim(path string) string {
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return strings.TrimSuffix(strings.TrimPrefix(path, o.Prefix), o.Suffix)
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}
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// Templates returns templates based on a filesystem
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func Templates(files fs.FS, opts Options) (*template.Template, error) {
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var ret *template.Template
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parseTemplates := func(name string, body []byte) error {
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var tmpl *template.Template
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if ret == nil {
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tmpl = template.New(name)
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if opts.Funcs != nil {
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tmpl = tmpl.Funcs(template.FuncMap(opts.Funcs))
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}
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} else {
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tmpl = ret.New(name)
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}
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tmpl, err := tmpl.Parse(string(body))
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if err != nil {
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return err
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}
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ret = tmpl
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return nil
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}
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if err := walk(files, opts, parseTemplates); err != nil {
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return nil, err
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}
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return ret, nil
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}
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// TextTemplates returns templates based on a filesystem
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func TextTemplates(files fs.FS, opts Options) (*txttmpl.Template, error) {
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var ret *txttmpl.Template
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parseTemplates := func(name string, body []byte) error {
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var tmpl *txttmpl.Template
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if ret == nil {
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tmpl = txttmpl.New(name)
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if opts.Funcs != nil {
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tmpl = tmpl.Funcs(txttmpl.FuncMap(opts.Funcs))
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}
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} else {
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tmpl = ret.New(name)
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}
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tmpl, err := tmpl.Parse(string(body))
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if err != nil {
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return err
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}
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ret = tmpl
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return nil
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}
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if err := walk(files, opts, parseTemplates); err != nil {
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return nil, err
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}
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return ret, nil
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}
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func walk(files fs.FS, opts Options, handle func(string, []byte) error) error {
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walker := func(path string, d fs.DirEntry, er error) (err error) {
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if er != nil {
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return er
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}
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matches, err := opts.matchesGlob(path)
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if err != nil {
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return err
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}
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if !matches {
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return nil
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}
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body, err := readfile(files, path)
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if err != nil {
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return err
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}
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if err := handle(opts.trim(path), body); err != nil {
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return err
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}
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return nil
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}
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if err := fs.WalkDir(files, opts.getRoot(), walker); err != nil {
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return err
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}
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return nil
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}
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func readfile(files fs.FS, path string) ([]byte, error) {
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f, err := files.Open(path)
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if err != nil {
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return nil, err
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}
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body, err := io.ReadAll(f)
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if err != nil {
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if err := f.Close(); err != nil {
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return nil, err
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}
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return nil, err
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}
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if err := f.Close(); err != nil {
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return nil, err
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}
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return body, nil
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} |