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pkgconfig.go
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pkgconfig.go
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package pkgconfig
import (
"bufio"
"io/fs"
"os"
"path/filepath"
"strings"
)
type Config struct {
Path string
Id string
Name string
Description string
URL string
Version string
Requires []string
Private []string
Conflict []string
Cflags string
Libs string
PrivLibs string
}
func LoadAll(root string) ([]*Config, error) {
var configs []*Config
for _, sub := range []string{"lib/pkgconfig", "share/pkgconfig"} {
err := filepath.Walk(filepath.Join(root, sub), func(path string, info fs.FileInfo, err error) error {
if filepath.Ext(path) == ".pc" {
cfg, err := Load(path)
if err != nil {
return err
}
configs = append(configs, cfg)
}
return nil
})
if err != nil {
return nil, err
}
}
return configs, nil
}
func Load(path string) (*Config, error) {
r, err := os.Open(path)
if err != nil {
return nil, err
}
defer r.Close()
br := bufio.NewReader(r)
vars := map[string]string{}
var cfg Config
cfg.Id = filepath.Base(path)
cfg.Id = cfg.Id[:len(cfg.Id)-3] // -3 to remove .pc
for {
line, err := br.ReadString('\n')
if err != nil {
break
}
var (
name string
value string
isVar bool
)
outer:
for i, b := range line {
switch b {
case '=':
name = line[:i]
value = strings.TrimSpace(line[i+1:])
isVar = true
break outer
case ':':
name = line[:i]
value = strings.TrimSpace(line[i+1:])
break outer
}
}
if name == "" {
continue
}
value = expand(value, vars)
if isVar {
vars[name] = value
} else {
switch name {
case "Name":
cfg.Name = value
case "Description":
cfg.Description = value
case "URL":
cfg.URL = value
case "Version":
cfg.Version = value
case "Requires":
cfg.Requires = strings.Split(value, ",")
case "Requires.private":
cfg.Private = strings.Split(value, ",")
case "Conflicts":
cfg.Conflict = strings.Split(value, ",")
case "Cflags":
cfg.Cflags = value
case "Libs":
cfg.Libs = value
case "Libs.private":
cfg.PrivLibs = value
}
}
}
return &cfg, nil
}
func expand(input string, vars map[string]string) string {
var sb strings.Builder
var (
state int
si int
)
for i, b := range input {
switch state {
case 0:
if b == '$' {
state = 1
} else {
sb.WriteRune(b)
}
case 1:
if b == '{' {
state = 2
si = i + 1
} else {
sb.WriteRune('$')
sb.WriteRune(b)
state = 0
}
case 2:
if b == '}' {
sb.WriteString(vars[input[si:i]])
state = 0
}
}
}
return sb.String()
}