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// Package tmpl contains functions for defining or executing in-line templates.
package tmpl
import (
"bytes"
"fmt"
"path/filepath"
"text/template"
)
// Template -
type Template struct {
root *template.Template
defaultCtx any
path string
}
// New -
func New(root *template.Template, tctx any, path string) *Template {
return &Template{root, tctx, path}
}
// Path - returns the path to the current template if it came from a file.
// An empty string is returned for inline templates.
func (t *Template) Path() (string, error) {
return t.path, nil
}
// PathDir - returns the directory of the template, if it came from a file. An empty
// string is returned for inline templates. If the template was loaded from the
// current working directory, "." is returned.
func (t *Template) PathDir() (string, error) {
if t.path == "" {
return "", nil
}
return filepath.Dir(t.path), nil
}
// Inline - a template function to do inline template processing
//
// Can be called 4 ways:
// {{ tmpl.Inline "inline template" }} - unnamed (single-use) template with default context
// {{ tmpl.Inline "name" "inline template" }} - named template with default context
// {{ tmpl.Inline "inline template" $foo }} - unnamed (single-use) template with given context
// {{ tmpl.Inline "name" "inline template" $foo }} - named template with given context
func (t *Template) Inline(args ...any) (string, error) {
name, in, ctx, err := t.parseArgs(args...)
if err != nil {
return "", err
}
return t.inline(name, in, ctx)
}
func (t *Template) inline(name, in string, ctx any) (string, error) {
tmpl, err := t.root.New(name).Parse(in)
if err != nil {
return "", err
}
return render(tmpl, ctx)
}
// Exec - execute (render) a template - this is the built-in `template` action, except with output...
func (t *Template) Exec(name string, tmplcontext ...any) (string, error) {
ctx := t.defaultCtx
if len(tmplcontext) == 1 {
ctx = tmplcontext[0]
}
tmpl := t.root.Lookup(name)
if tmpl == nil {
return "", fmt.Errorf(`template "%s" not defined`, name)
}
return render(tmpl, ctx)
}
func render(tmpl *template.Template, ctx any) (string, error) {
out := &bytes.Buffer{}
err := tmpl.Execute(out, ctx)
if err != nil {
return "", err
}
return out.String(), nil
}
func (t *Template) parseArgs(args ...any) (name, in string, ctx any, err error) {
name = "<inline>"
ctx = t.defaultCtx
if len(args) == 0 || len(args) > 3 {
return "", "", nil, fmt.Errorf("wrong number of args for tpl: want 1, 2, or 3 - got %d", len(args))
}
first, ok := args[0].(string)
if !ok {
return "", "", nil, fmt.Errorf("wrong input: first arg must be string, got %T", args[0])
}
switch len(args) {
case 1:
in = first
case 2:
// this can either be (name string, in string) or (in string, ctx any)
switch second := args[1].(type) {
case string:
name = first
in = second
default:
in = first
ctx = second
}
case 3:
name = first
var ok bool
in, ok = args[1].(string)
if !ok {
return "", "", nil, fmt.Errorf("wrong input: second arg (in) must be string, got %T", args[0])
}
ctx = args[2]
}
return name, in, ctx, nil
}
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