1package main
  2
  3import (
  4	"fmt"
  5	"strconv"
  6	"strings"
  7	"time"
  8)
  9
 10type (
 11	// https://wiki.alpinelinux.org/wiki/Apk_spec
 12	Entry struct {
 13		Checksum         string     // C
 14		Version          string     // V
 15		Name             string     // P
 16		Architecture     *string    // A
 17		PackageSize      int        // S
 18		InstalledSize    int        // I
 19		Description      string     // T
 20		Url              string     // U
 21		License          string     // L
 22		Origin           *string    // o
 23		Maintainer       *string    // m
 24		BuildTime        *time.Time // t
 25		Commit           *string    // c
 26		ProviderPriority *int       // k
 27		Dependencies     []string   // D
 28		Provides         []string   // p
 29		InstallIf        []string   // i
 30	}
 31)
 32
 33func (e *Entry) FomartLink(format string) string {
 34	c := strings.Replace(*e.Commit, "-dirty", "", -1)
 35	return fmt.Sprintf(format, c, *e.Origin)
 36}
 37
 38func (e *Entry) Properties() map[string]string {
 39	p := make(map[string]string)
 40
 41	p["checksum"] = e.Checksum
 42	p["version"] = e.Version
 43	p["name"] = e.Name
 44	p["package size"] = strconv.Itoa(e.PackageSize)
 45	p["installed size"] = strconv.Itoa(e.InstalledSize)
 46	p["description"] = e.Description
 47	p["url"] = e.Url
 48	p["license"] = e.License
 49
 50	if e.Architecture != nil {
 51		p["architecture"] = *e.Architecture
 52	}
 53
 54	if e.Origin != nil {
 55		p["origin"] = *e.Origin
 56	}
 57
 58	if e.Maintainer != nil {
 59		p["maintainer"] = *e.Maintainer
 60	}
 61
 62	if e.BuildTime != nil {
 63		p["build time"] = e.BuildTime.String()
 64	}
 65
 66	if e.Commit != nil {
 67		p["commit"] = *e.Commit
 68	}
 69
 70	if e.ProviderPriority != nil {
 71		p["provider priority"] = strconv.Itoa(*e.ProviderPriority)
 72	}
 73
 74	if len(e.Dependencies) > 0 {
 75		p["dependencies"] = strings.Join(e.Dependencies, " ")
 76	}
 77
 78	if len(e.Provides) > 0 {
 79		p["provides"] = strings.Join(e.Provides, " ")
 80	}
 81
 82	if len(e.InstallIf) > 0 {
 83		p["install if"] = strings.Join(e.InstallIf, " ")
 84	}
 85
 86	return p
 87}
 88
 89func ptr[T any](v T) *T {
 90	return &v
 91}
 92
 93func split(line string) (string, string) {
 94	parts := strings.SplitN(line, ":", 2)
 95	return parts[0], parts[1]
 96}
 97
 98func toInt(v string) int {
 99	i, _ := strconv.Atoi(v)
100	return i
101}
102
103func Parse(lines []string) *Entry {
104	entry := &Entry{}
105	for _, line := range lines {
106		r, c := split(line)
107		switch r {
108		case "C":
109			entry.Checksum = c
110		case "V":
111			entry.Version = c
112		case "P":
113			entry.Name = c
114		case "A":
115			entry.Architecture = &c
116		case "S":
117			entry.PackageSize = toInt(c)
118		case "I":
119			entry.InstalledSize = toInt(c)
120		case "T":
121			entry.Description = c
122		case "U":
123			entry.Url = c
124		case "L":
125			entry.License = c
126		case "o":
127			entry.Origin = &c
128		case "m":
129			entry.Maintainer = &c
130		case "t":
131			entry.BuildTime = ptr(time.Unix(int64(toInt(c)), 0))
132		case "c":
133			entry.Commit = &c
134		case "k":
135			entry.ProviderPriority = ptr(toInt(c))
136		case "D":
137			entry.Dependencies = strings.Split(c, " ")
138		case "p":
139			entry.Dependencies = strings.Split(c, " ")
140		case "i":
141			entry.Dependencies = strings.Split(c, " ")
142		}
143	}
144	return entry
145}