name_pattern.go

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`c62570e2` 2022-09-23 Pavel Safronov	1	package main
	2
`71bdf574` 2022-09-23 Pavel Safronov	3	import (
	4	"errors"
`05f9e8ef` 2022-10-06 Pavel Safronov	5	"fmt"
`71bdf574` 2022-09-23 Pavel Safronov	6	"strings"
	7	"text/template"
	8	"time"
`5c81baec` 2022-11-20 Pavel Safronov	9
	10	"github.com/Masterminds/sprig/v3"
`71bdf574` 2022-09-23 Pavel Safronov	11	)
`c62570e2` 2022-09-23 Pavel Safronov	12
`687d5626` 2022-10-28 Pavel Safronov	13	func createNewNameForPatterns(
	14	now time.Time,
`8c15a714` 2022-11-04 Pavel Safronov	15	patternData PrePatternData,
`687d5626` 2022-10-28 Pavel Safronov	16	projectName string,
	17	namePatterns []ParameterizedText,
`10676da3` 2022-11-06 Pavel Safronov	18	extras map[string]string,
	19	validator func(newName string) bool) (string, error) {
`5e7795dc` 2022-10-21 Pavel Safronov	20	for index, namePattern := range namePatterns {
`71bdf574` 2022-09-23 Pavel Safronov	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)
`5c81baec` 2022-11-20 Pavel Safronov	31	template = template.Funcs(sprig.FuncMap())
`71bdf574` 2022-09-23 Pavel Safronov	32
	33	for {
	34
`1a02ef4e` 2022-10-21 Pavel Safronov	35	template, err := template.Parse(string(namePattern))
`71bdf574` 2022-09-23 Pavel Safronov	36	if err != nil {
`8c15a714` 2022-11-04 Pavel Safronov	37	return "", fmt.Errorf("error parsing name pattern %d: %w", index, err)
`71bdf574` 2022-09-23 Pavel Safronov	38	}
	39
	40	sb := new(strings.Builder)
	41	err = template.Execute(sb, patternData)
	42	if err != nil {
`8c15a714` 2022-11-04 Pavel Safronov	43	return "", fmt.Errorf("error executing name pattern %d: %w", index, err)
`71bdf574` 2022-09-23 Pavel Safronov	44	}
	45
	46	newName := sb.String()
`10676da3` 2022-11-06 Pavel Safronov	47	isValid := validator(newName)
`71bdf574` 2022-09-23 Pavel Safronov	48	useIndex := invokeCount > 0
`5e7795dc` 2022-10-21 Pavel Safronov	49	isLastPattern := index == len(namePatterns)-1
`71bdf574` 2022-09-23 Pavel Safronov	50
`10676da3` 2022-11-06 Pavel Safronov	51	// if new name is valid, use this name
	52	if isValid {
`8c15a714` 2022-11-04 Pavel Safronov	53	return newName, nil
`71bdf574` 2022-09-23 Pavel Safronov	54	}
`10676da3` 2022-11-06 Pavel Safronov	55
`71bdf574` 2022-09-23 Pavel Safronov	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 {
`8c15a714` 2022-11-04 Pavel Safronov	64	return "", errors.New("cannot use function getVersion in a pattern that is not the last pattern")
`71bdf574` 2022-09-23 Pavel Safronov	65	}
	66
	67	startingVersion++
	68	}
	69	}
`8c15a714` 2022-11-04 Pavel Safronov	70	return "", errors.New("couldn't find a new name")
`71bdf574` 2022-09-23 Pavel Safronov	71	}