Add --side argument to filter list command (#256)

* added list command filter by side

* changed error logging for --side flags

* removed len checks on side flags

* removed comments previous commit made useless

cmd/list.go

@@ -39,6 +39,24 @@ var listCmd = &cobra.Command{
 			os.Exit(1)
 		}
 
+		// Filter mods by side
+		if viper.IsSet("list.side") {
+			side := viper.GetString("list.side")
+			if side != core.UniversalSide && side != core.ServerSide && side != core.ClientSide {
+				fmt.Printf("Invalid side %q, must be one of client, server, or both (default)\n", side)
+				os.Exit(1)
+			}
+
+			i := 0
+			for _, mod := range mods {
+				if mod.Side == side || mod.Side == core.EmptySide || mod.Side == core.UniversalSide || side == core.UniversalSide {
+					mods[i] = mod
+					i++
+				}
+			}
+			mods = mods[:i]
+		}
+
 		sort.Slice(mods, func(i, j int) bool {
 			return strings.ToLower(mods[i].Name) < strings.ToLower(mods[j].Name)
 		})
@@ -61,4 +79,7 @@ func init() {
 
 	listCmd.Flags().BoolP("version", "v", false, "Print name and version")
 	_ = viper.BindPFlag("list.version", listCmd.Flags().Lookup("version"))
+	listCmd.Flags().StringP("side", "s", "", "Filter mods by side (e.g., client or server)")
+	_ = viper.BindPFlag("list.side", listCmd.Flags().Lookup("side"))
+
 }

curseforge/export.go

@@ -4,13 +4,14 @@ import (
 	"archive/zip"
 	"bufio"
 	"fmt"
+	"os"
+	"strconv"
+
 	"github.com/packwiz/packwiz/cmdshared"
 	"github.com/packwiz/packwiz/core"
 	"github.com/packwiz/packwiz/curseforge/packinterop"
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
-	"os"
-	"strconv"
 )
 
 // exportCmd represents the export command
@@ -20,8 +21,8 @@ var exportCmd = &cobra.Command{
 	Args:  cobra.NoArgs,
 	Run: func(cmd *cobra.Command, args []string) {
 		side := viper.GetString("curseforge.export.side")
-		if len(side) == 0 || (side != core.UniversalSide && side != core.ServerSide && side != core.ClientSide) {
+		if side != core.UniversalSide && side != core.ServerSide && side != core.ClientSide {
-			fmt.Println("Invalid side!")
+			fmt.Printf("Invalid side %q, must be one of client, server, or both (default)\n", side)
 			os.Exit(1)
 		}