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// Package vfstemplate offers text/template helpers that use http.FileSystem.
package vfstemplate
import (
"fmt"
"net/http"
"path"
"text/template"
"github.com/shurcooL/httpfs/path/vfspath"
"github.com/shurcooL/httpfs/vfsutil"
)
// ParseFiles creates a new Template if t is nil and parses the template definitions from
// the named files. The returned template's name will have the (base) name and
// (parsed) contents of the first file. There must be at least one file.
// If an error occurs, parsing stops and the returned *Template is nil.
func ParseFiles(fs http.FileSystem, t *template.Template, filenames ...string) (*template.Template, error) {
return parseFiles(fs, t, filenames...)
}
// ParseGlob parses the template definitions in the files identified by the
// pattern and associates the resulting templates with t. The pattern is
// processed by vfspath.Glob and must match at least one file. ParseGlob is
// equivalent to calling t.ParseFiles with the list of files matched by the
// pattern.
func ParseGlob(fs http.FileSystem, t *template.Template, pattern string) (*template.Template, error) {
filenames, err := vfspath.Glob(fs, pattern)
if err != nil {
return nil, err
}
if len(filenames) == 0 {
return nil, fmt.Errorf("vfs/text/vfstemplate: pattern matches no files: %#q", pattern)
}
return parseFiles(fs, t, filenames...)
}
// parseFiles is the helper for the method and function. If the argument
// template is nil, it is created from the first file.
func parseFiles(fs http.FileSystem, t *template.Template, filenames ...string) (*template.Template, error) {
if len(filenames) == 0 {
// Not really a problem, but be consistent.
return nil, fmt.Errorf("vfs/text/vfstemplate: no files named in call to ParseFiles")
}
for _, filename := range filenames {
b, err := vfsutil.ReadFile(fs, filename)
if err != nil {
return nil, err
}
s := string(b)
name := path.Base(filename)
// First template becomes return value if not already defined,
// and we use that one for subsequent New calls to associate
// all the templates together. Also, if this file has the same name
// as t, this file becomes the contents of t, so
// t, err := New(name).Funcs(xxx).ParseFiles(name)
// works. Otherwise we create a new template associated with t.
var tmpl *template.Template
if t == nil {
t = template.New(name)
}
if name == t.Name() {
tmpl = t
} else {
tmpl = t.New(name)
}
_, err = tmpl.Parse(s)
if err != nil {
return nil, err
}
}
return t, nil
}
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