apt.Search improvements:

apt.go

@@ -44,13 +44,19 @@ func List() ([]*Package, error) {
 // Search list packages available in the system that match the search
 // pattern
 func Search(pattern string) ([]*Package, error) {
-cmd := exec.Command("dpkg-query", "-W", "-f=${Package}\t${Architecture}\t${db:Status-Status}\t${Version}\n", pattern)
-out, err := cmd.Output()
+res := []*Package{}
+
+cmd := exec.Command("dpkg-query", "-W", "-f=${Package}\t${Architecture}\t${db:Status-Status}\t${Version}\n", "*"+pattern+"*")
+
+out, err := cmd.CombinedOutput()
 if err != nil {
-return nil, fmt.Errorf("running dpkg-query: %s", err)
+// Avoid returning an error if the list is empty
+if bytes.Contains(out, []byte("no packages found matching")) {
+return res, nil
+}
+return nil, fmt.Errorf("running dpkg-query: %s - %s", err, out)
 }
 
-res := []*Package{}
 scanner := bufio.NewScanner(bytes.NewReader(out))
 for scanner.Scan() {
 data := strings.Split(scanner.Text(), "\t")

apt_test.go

@@ -38,18 +38,28 @@ func TestList(t *testing.T) {
 continue
 }
 statusCount[p.Status]++
-fmt.Printf("%+v\n", p)
+// fmt.Printf("%+v\n", p)
 }
 
-fmt.Println("Summary:")
-for k, v := range statusCount {
-fmt.Printf(" %s: %d\n", k, v)
-}
+// fmt.Println("Summary:")
+// for k, v := range statusCount {
+// fmt.Printf(" %s: %d\n", k, v)
+// }
 
 require.NotNil(t, dpkg, "search package 'dpkg'")
 require.Equal(t, "installed", dpkg.Status, "'dpkg' status")
 }
 
+func TestSearch(t *testing.T) {
+list, err := Search("nonexisting")
+require.NoError(t, err, "running Search command")
+require.Empty(t, list, "Search command result")
+
+list, err = Search("header")
+require.NoError(t, err, "running Search command")
+require.NotEmpty(t, list, "Search command result")
+}
+
 func TestListUpgradable(t *testing.T) {
 list, err := ListUpgradable()
 for _, p := range list {