name_pattern.go

1	package main
2
3	import (
4	"errors"
5	"fmt"
6	"strings"
7	"text/template"
8	"time"
9
10	"github.com/Masterminds/sprig/v3"
11	)
12
13	func createNewNameForPatterns(
14	now time.Time,
15	patternData PrePatternData,
16	projectName string,
17	namePatterns []ParameterizedText,
18	extras map[string]string,
19	validator func(newName string) bool) (string, error) {
20	for index, namePattern := range namePatterns {
21
22	startingVersion := 1
23	invokeCount := 0
24	funcMap := template.FuncMap{
25	"getVersion": func() int {
26	invokeCount++
27	return startingVersion
28	},
29	}
30	template := template.New("template-name").Funcs(funcMap)
31	template = template.Funcs(sprig.FuncMap())
32
33	for {
34
35	template, err := template.Parse(string(namePattern))
36	if err != nil {
37	return "", fmt.Errorf("error parsing name pattern %d: %w", index, err)
38	}
39
40	sb := new(strings.Builder)
41	err = template.Execute(sb, patternData)
42	if err != nil {
43	return "", fmt.Errorf("error executing name pattern %d: %w", index, err)
44	}
45
46	newName := sb.String()
47	isValid := validator(newName)
48	useIndex := invokeCount > 0
49	isLastPattern := index == len(namePatterns)-1
50
51	// if new name is valid, use this name
52	if isValid {
53	return newName, nil
54	}
55
56	// if index is not being used (template did not invoke getVersion)
57	// then we're done
58	if !useIndex {
59	break
60	}
61
62	// if getVersion was used, but this isn't the last pattern, report an error
63	if useIndex && !isLastPattern {
64	return "", errors.New("cannot use function getVersion in a pattern that is not the last pattern")
65	}
66
67	startingVersion++
68	}
69	}
70	return "", errors.New("couldn't find a new name")
71	}