massive: move a lot of things

x-tba/swapi-api-client/main.go

@@ -0,0 +1,84 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"strconv"
+	"time"
+)
+
+// const
+// nil, string, int, float64, bool, comparison
+// variables
+//   multiple short variables
+//   assignment?
+// if
+// error handling
+// functions
+//   returns
+//   defer
+// struct
+//   encoding/json
+// pointers
+// concurrency
+//   select
+//   chan receive
+// fmt
+//   Printf
+//   Sprintf
+//   Errorf
+// net/http
+//   Get
+// context/Context
+
+// TODO: convert fmt calls to log
+// TODO: you can make the fetcher a library and main package the user
+// TODO: you can generate an html for the ship details? template pkg.
+
+const timeout = 10 * time.Second
+
+func main() {
+	args := os.Args[1:]
+	quit("give me a film id", len(args) != 1)
+
+	id, err := strconv.Atoi(args[0])
+	quit("film id is incorrrect", err)
+
+	ctx, cancel := context.WithTimeout(context.Background(), timeout)
+	defer cancel()
+
+	// TODO: print the ship details to a text file (or any io.Writer)
+
+	film, err := fetchFilm(ctx, id)
+	quit("Error occurred while fetching the film data", err)
+	fmt.Println(film)
+
+	// a channel also can be used to print as they come
+	ships := make([]Starship, len(film.Starships))
+	err = fetchStarships(ctx, film.Starships, ships)
+	quit("Error occurred while fetching starships", err)
+
+	fmt.Println("Ships used in the movie:")
+	fmt.Println("------------------------")
+	for _, ship := range ships {
+		fmt.Println(ship)
+	}
+}
+
+func quit(message string, cond interface{}) {
+	var quit bool
+
+	switch v := cond.(type) {
+	case error:
+		quit = true
+		message += ": " + v.Error()
+	case bool:
+		quit = v
+	}
+
+	if quit {
+		fmt.Fprintln(os.Stderr, message)
+		os.Exit(1)
+	}
+}