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