1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127

package registry

import (
	"bytes"
	"fmt"
	"os"
	"path/filepath"
	"strings"
	"text/template"
	"time"

	"github.com/Masterminds/sprig/v3"
	"github.com/mholt/archiver/v3"
)

// Template is a tmpl project
type Template struct {
	reg        *Registry `yaml:"-"`
	Name       string    `yaml:"name"`
	Path       string    `yaml:"path"`
	Repository string    `yaml:"repository"`
	Branch     string    `yaml:"branch"`
	LastUpdate time.Time `yaml:"last_update"`
}

// ArchiveName is the name given to the archive for this Template
func (t *Template) ArchiveName() string {
	return fmt.Sprintf("%s.tar.gz", t.Name)
}

// ArchivePath is the full path to the archive for this Template within the Registry
func (t *Template) ArchivePath() string {
	return filepath.Join(t.reg.dir, t.ArchiveName())
}

// Execute runs the Template and copies to dest
func (t *Template) Execute(dest string, defaults, overwrite bool) error {
	tmp, err := os.MkdirTemp(os.TempDir(), "tmpl")
	if err != nil {
		return err
	}
	defer os.RemoveAll(tmp)

	if err := archiver.Unarchive(t.ArchivePath(), tmp); err != nil {
		return err
	}

	prompts, err := prompt(tmp, defaults)
	if err != nil {
		return err
	}

	funcs := mergeMaps(funcMap, prompts.ToFuncMap(), sprig.TxtFuncMap())
	base := filepath.Join(tmp, "template")
	return filepath.Walk(base, func(walkPath string, walkInfo os.FileInfo, walkErr error) error {
		if walkErr != nil {
			return walkErr
		}

		if walkInfo.IsDir() {
			return nil
		}

		contents, err := os.ReadFile(walkPath)
		if err != nil {
			return err
		}

		newDest := strings.TrimPrefix(walkPath, base+string(filepath.Separator))
		newDest = filepath.Join(dest, newDest)

		tmplDest, err := template.New("dest").Funcs(funcs).Parse(newDest)
		if err != nil {
			return err
		}

		var buf bytes.Buffer
		if err := tmplDest.Execute(&buf, prompts.ToMap()); err != nil {
			return err
		}
		newDest = buf.String()

		if err := os.MkdirAll(filepath.Dir(newDest), os.ModePerm); err != nil {
			return err
		}

		// Skip .tmplkeep files, after creating the directory structure
		if strings.EqualFold(walkInfo.Name(), ".tmplkeep") {
			return nil
		}

		oldFi, err := os.Lstat(walkPath)
		if err != nil {
			return err
		}

		// Check if new file exists. If it does, only skip if not overwriting
		if _, err := os.Lstat(newDest); err == nil && !overwrite {
			return nil
		}

		newFi, err := os.OpenFile(newDest, os.O_RDWR|os.O_CREATE|os.O_TRUNC, oldFi.Mode())
		if err != nil {
			return err
		}

		tmplContents, err := template.New("tmpl").Funcs(funcs).Parse(string(contents))
		if err != nil {
			return err
		}
		if err := tmplContents.Execute(newFi, prompts.ToMap()); err != nil {
			return err
		}

		return newFi.Close()
	})
}

func mergeMaps(maps ...map[string]any) map[string]any {
	m := make(map[string]any)
	for _, mm := range maps {
		for k, v := range mm {
			m[k] = v
		}
	}
	return m
}