add list users subcommand

related issue: #37

README.md

@@ -33,18 +33,18 @@ Unofficial packages are available on: [Debian](https://packages.debian.org/buste
 
 ### Commands
 
-	update                Update the index
-	search [<regexp...>]  Search available apps
-	show <appid...>       Show detailed info about apps
-	install [<appid...>]  Install or upgrade apps
-	uninstall <appid...>  Uninstall an app
-	download <appid...>   Download an app
-	devices               List connected devices
-	list (categories)     List all known values of a kind
-	repo                  Manage repositories
-	clean                 Clean index and/or cache
-	defaults              Reset to the default settings
-	version               Print version information
+	update                   Update the index
+	search [<regexp...>]     Search available apps
+	show <appid...>          Show detailed info about apps
+	install [<appid...>]     Install or upgrade apps
+	uninstall <appid...>     Uninstall an app
+	download <appid...>      Download an app
+	devices                  List connected devices
+	list (categories/users)  List all known values of a kind
+	repo                     Manage repositories
+	clean                    Clean index and/or cache
+	defaults                 Reset to the default settings
+	version                  Print version information
 
 
 An appid is just an app's unique package name. A specific version of an app can

list.go

@@ -4,13 +4,16 @@
 package main
 
 import (
+	"bufio"
 	"fmt"
 	"os"
+	"regexp"
 	"sort"
+	"strings"
 )
 
 var cmdList = &Command{
-	UsageLine: "list (categories)",
+	UsageLine: "list (categories/users)",
 	Short:     "List all known values of a kind",
 }
 
@@ -34,6 +37,10 @@ func runList(args []string) error {
 				values[c] = struct{}{}
 			}
 		}
+	case "users":
+		if err := listUsers(); err != nil {
+			return err
+		}
 	default:
 		return fmt.Errorf("invalid argument")
 	}
@@ -47,3 +54,64 @@ func runList(args []string) error {
 	}
 	return nil
 }
+
+var userIdNameRegex = regexp.MustCompile(`UserInfo{(\d+):([^:}]*):[^}]*}`)
+
+func listUsers() error {
+	device, err := oneDevice()
+	if err != nil {
+		return err
+	}
+	cmd := device.AdbShell("pm", "list", "users")
+	stdout, err := cmd.StdoutPipe()
+	if err != nil {
+		return err
+	}
+	if err := cmd.Start(); err != nil {
+		return err
+	}
+	uidHeader := "UID"
+	nameHeader := "Name"
+	runningHeader := "Running"
+	scanner := bufio.NewScanner(stdout)
+	uids := make([]string, 0)
+	names := make([]string, 0)
+	running := make([]bool, 0)
+	maxUidLen := len(uidHeader)
+	maxNameLen := len(nameHeader)
+	for scanner.Scan() {
+		text := scanner.Text()
+		m := userIdNameRegex.FindStringSubmatch(text)
+		if m == nil {
+			continue
+		}
+		uid := m[1]
+		uids = append(uids, uid)
+		if uidLen := len(uid); uidLen > maxUidLen {
+			maxUidLen = uidLen
+		}
+		name := m[2]
+		names = append(names, name)
+		if nameLen := len(name); nameLen > maxNameLen {
+			maxNameLen = nameLen
+		}
+		currentRunning := false
+		if strings.HasSuffix(strings.TrimSpace(text), "running") {
+			currentRunning = true
+		}
+		running = append(running, currentRunning)
+	}
+	if len(uids) == 0 {
+		return nil
+	}
+	fmt.Printf("%-*s %-*s %s\n", maxUidLen, uidHeader, maxNameLen, nameHeader, runningHeader)
+	for i, uid := range uids {
+		name := names[i]
+		runningStr := ""
+		if running[i] {
+			runningStr = "Yes"
+		}
+		fmt.Printf("%*s %-*s %s\n", maxUidLen, uid, maxNameLen, name, runningStr)
+	}
+	return nil
+}