add follow command

cmd/mstdn/cmd_follow.go

@@ -0,0 +1,30 @@
+package main
+
+import (
+	"context"
+	"errors"
+
+	"github.com/mattn/go-mastodon"
+	"github.com/urfave/cli"
+)
+
+func cmdFollow(c *cli.Context) error {
+	client := c.App.Metadata["client"].(*mastodon.Client)
+	if !c.Args().Present() {
+		return errors.New("arguments required")
+	}
+	for i := 0; i < c.NArg(); i++ {
+		account, err := client.AccountsSearch(context.Background(), c.Args().Get(i), 1)
+		if err != nil {
+			return err
+		}
+		if len(account) == 0 {
+			continue
+		}
+		_, err = client.AccountFollow(context.Background(), account[0].ID)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}

cmd/mstdn/main.go

@@ -222,6 +222,11 @@ func makeApp() *cli.App {
 			Usage:  "show followers",
 			Action: cmdFollowers,
 		},
+		{
+			Name:   "follow",
+			Usage:  "follow account",
+			Action: cmdFollow,
+		},
 		{
 			Name:   "upload",
 			Usage:  "upload file",