main.go

package main

import (
	"encoding/json"
	"errors"
	"flag"
	"fmt"
	"io/ioutil"
	"net/http"
	"os"
)

func main() {
	flag.Parse()
	username := flag.Arg(0)
	if username == "" {
		ExitWithError(errors.New("need to provide a username"))
	}

	resp, err := http.Get("https://api.app.net/users/@" + flag.Arg(0))
	if err != nil {
		ExitWithError(err)
	}
	defer resp.Body.Close()

	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		ExitWithError(err)
	}

	var record UserResponse
	err = json.Unmarshal(body, &record)
	if err != nil {
		ExitWithError(err)
	}

	fmt.Printf("@%s has %d followers, has starred %d posts, and has this to say about themselves: %s\n",
		record.Data.Username,
		record.Data.Counts.Followers,
		record.Data.Counts.Stars,
		record.Data.Description.Text)
}

func ExitWithError(err error) {
	fmt.Println(err)
	os.Exit(1)
}

user.go

package main

type UserResponse struct {
	Data User `json:"data"`
	Meta Meta `json:"meta"`
}

type Annotation struct {
	Type  string            `json:"type"`
	Value map[string]string `json:"value"`
}

type Description struct {
	Text     string   `json:"text"`
	Html     string   `json:"html"`
	Entities Entities `json:"entities"`
}

type UserCounts struct {
	Following int `json:"following"`
	Followers int `json:"followers"`
	Posts     int `json:"posts"`
	Stars     int `json:"stars"`
}

type Image struct {
	Height    int    `json:"height"`
	Width     int    `json:"width"`
	IsDefault bool   `json:"is_default"`
	Url       string `json:"url"`
}

type User struct {
	Id              string       `json:"id"`
	Username        string       `json:"username"`
	Name            string       `json:"name"`
	Description     Description  `json:"description"`
	Timezone        string       `json:"timezone"`
	Locale          string       `json:"locale"`
	AvatarImage     Image        `json:"avatar_image"`
	CoverImage      Image        `json:"cover_image"`
	Type            string       `json:"type"`
	CreatedAt       string       `json:"created_at"`
	Counts          UserCounts   `json:"counts"`
	FollowsYou      bool         `json:"follows_you"`
	YouBlocked      bool         `json:"you_blocked"`
	YouFollow       bool         `json:"you_follow"`
	YouMuted        bool         `json:"you_muted"`
	YouCanSubscribe bool         `json:"you_can_subscribe"`
	YouCanFollow    bool         `json:"you_can_follow"`
	VerifiedDomain  string       `json:"verified_domain"`
	Annotations     []Annotation `json:"annotations"`
	CanonicalUrl    string       `json:"canonical_url"`
}