railpack

1package generate2 3import (4	"bytes"5	"errors"6	"fmt"7	"text/template"8 9	"github.com/railwayapp/railpack/core/app"10)11 12type TemplateFileResult struct {13	Filename string14	Contents string15}16 17// TemplateFiles will look the first file that exists in the list of potential files and render it with the given data18// If no file is found, it will use the default contents and render it with the given data19func (c *GenerateContext) TemplateFiles(potentialFiles []string, defaultContents string, data map[string]any) (*TemplateFileResult, error) {20	filename, contents, err := c.App.ReadFirstFileOf(potentialFiles...)21	if err != nil {22		if !errors.Is(err, app.ErrNoFileFound) {23			return nil, err24		}25 26		contents = defaultContents27	}28 29	tmpl, err := template.New(filename).Parse(contents)30	if err != nil {31		return nil, fmt.Errorf("failed to parse template: %w", err)32	}33 34	var buf bytes.Buffer35	if err := tmpl.Execute(&buf, data); err != nil {36		return nil, fmt.Errorf("failed to execute template: %w", err)37	}38 39	return &TemplateFileResult{40		Filename: filename,41		Contents: buf.String(),42	}, nil43}44