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main.go
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main.go
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// MIT License
// Copyright (c) 2018 Yann Druffin
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
// Console application to display stories form news aggregators
package main
import (
"flag"
"fmt"
"log"
"os"
"strings"
"github.com/yanndr/topstories/provider"
"github.com/yanndr/topstories/provider/hackernews"
"github.com/yanndr/topstories/provider/reddit"
)
func main() {
var (
output *os.File
sw provider.StoryWriter
err error
)
csvPtr := flag.Bool("csv", false, "Save the result to a csv file.")
prPtr := flag.String("p", "hackernews", "Stories provider: hackernews or reddit")
path := flag.String("o", "outupt.csv", "output file name")
n := flag.Int("n", 20, "number of stories to display")
c := flag.Uint("c", 20, "max concurency allowed")
flag.Parse()
if *c < 1 {
fmt.Println("Cannot have less than 1 go routine allowed.")
os.Exit(1)
}
if *csvPtr {
output, err = os.Create(*path)
if err != nil {
log.Panicf("cannot create the file: %s", err)
}
sw = provider.NewCsvWriter(output)
} else {
sw = provider.NewWriter(os.Stdout)
output = os.Stdout
}
defer output.Close()
p, err := getProviderByName(*prPtr, *c)
if err != nil {
fmt.Printf("Can't reconize provider %s, %s\n", *prPtr, err)
os.Exit(1)
}
err = run(p, sw, *n)
if err != nil {
log.Panic(err)
}
}
func getProviderByName(name string, maxConcurecy uint) (provider.StoryProvider, error) {
switch strings.ToLower(name) {
case "hackernews":
return hackernews.New(maxConcurecy), nil
case "reddit":
return reddit.New(), nil
default:
return nil, fmt.Errorf("provider not found")
}
}
func run(p provider.StoryProvider, w provider.StoryWriter, n int) error {
resp, err := p.GetStories(n)
if err != nil {
return fmt.Errorf("cannot get the stories: %s", err)
}
for r := range resp {
if r.Error != nil {
return r.Error
}
err := w.Write(r.Story)
if err != nil {
return fmt.Errorf("cannot write the story: %v", r.Error)
}
}
return w.Flush()
}