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gen.go
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gen.go
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package internal
import (
"fmt"
"io/ioutil"
"os/exec"
"path/filepath"
"strings"
"time"
)
const (
pkgDateKeyword keywordType = "{date}"
pkgTimeKeyword keywordType = "{time}"
pkgSystemKeyword keywordType = "{system}"
)
var pkgKeywords = keywordSet{
newKeyword(pkgDateKeyword),
newKeyword(pkgTimeKeyword),
newKeyword(pkgSystemKeyword),
}
func GenPackageList(config *configuration) error {
var path string
if config.Pkglist.Name != "" {
path = filepath.Join(config.Pkglist.Path, config.Pkglist.Name)
} else {
path = filepath.Join(config.Pkglist.Path, "pkglist.txt")
}
for _, kw := range pkgKeywords {
switch kw.kwType {
case pkgDateKeyword:
currentDate := time.Now().Local().Format("2006-01-02")
path = kw.transform(path, currentDate)
case pkgTimeKeyword:
currentTime := time.Now().Local().Format("15:04:05")
path = kw.transform(path, currentTime)
case pkgSystemKeyword:
if system, err := getUserOS(); err == nil {
path = kw.transform(path, system)
} else {
return newError(err, "Failed to determine operating system")
}
}
}
var targetPackages []byte
if err := checkFile(path); err == nil {
targetPackages, err = ioutil.ReadFile(path)
if err != nil {
return newError(err, "Failed to read package list")
}
}
systemPackages, err := getSystemPackages()
if err != nil {
return newError(err, "Failed to determine installed packages")
}
var (
targetPackagesList = strings.Split(string(targetPackages), "\n")
systemPackagesList = strings.Split(string(systemPackages), "\n")
addedPackagesList = difference(systemPackagesList, targetPackagesList)
removedPackagesList = difference(targetPackagesList, systemPackagesList)
)
defer fmt.Printf("%d Packages\n", len(systemPackagesList))
if len(addedPackagesList) != 0 {
fmt.Printf("Added/Updated (%+d):\n", len(addedPackagesList))
displayPackages(addedPackagesList)
}
if len(removedPackagesList) != 0 {
fmt.Printf("Removed (-%d):\n", len(removedPackagesList))
displayPackages(removedPackagesList)
}
if len(addedPackagesList) == 0 && len(removedPackagesList) == 0 {
fmt.Println("Package list is up to date")
return nil
}
if config.dryRun {
return nil
}
if err := ioutil.WriteFile(path, systemPackages, 0644); err != nil {
return newError(err, "Failed to write to package list")
}
return nil
}
func getSystemPackages() ([]byte, error) {
userOS, err := getUserOS()
if err != nil {
return nil, err
}
var cmd *exec.Cmd
switch userOS {
case "arch":
cmd = exec.Command("pacman", "-Q")
default:
return nil, fmt.Errorf("unknown operating system: %s", userOS)
}
return cmd.Output()
}
func getUserOS() (string, error) {
cmd := exec.Command("uname", "-n")
if output, err := cmd.Output(); err == nil {
return strings.Trim(string(output), "\n"), nil
} else {
return "", err
}
}
func displayPackages(packages []string) {
for _, item := range packages {
fmt.Printf("- %s\n", strings.Fields(item)[0])
}
}