modules/commands: Implement 'pgqversion' command

modules/commands/commands.go

@@ -24,4 +24,8 @@ var list = []command{
 		Name:    "star",
 		Handler: handleStarCommand,
 	},
+	command{
+		Name:    "version",
+		Handler: handleVersionCommand,
+	},
 }

modules/commands/version.go

@@ -0,0 +1,34 @@
+package commands
+
+import (
+	"fmt"
+	"os/exec"
+	"strings"
+
+	"github.com/bwmarrin/discordgo"
+
+	"PermissionGacha/modules/log"
+)
+
+var versionString string
+
+func handleVersionCommand(s *discordgo.Session, args []string, m *discordgo.MessageCreate) error {
+	if versionString == "" {
+		out, err := exec.Command("git describe --tags").Output()
+		if err != nil {
+			log.Error(
+				s,
+				fmt.Errorf("modules/commands: error while requesting version information from git: %v", err),
+			)
+			versionString = "Error while generating version string."
+		} else {
+			info := strings.Split(string(out), " ")
+			versionString = fmt.Sprintf(
+				"**VERSION > **Current running version: __%s.%s__ (Internal ID: %s)",
+				info[0], info[1], info[2],
+			)
+		}
+	}
+	s.ChannelMessageSend(m.ChannelID, versionString)
+	return nil
+}