Add CLI flags

README.md

@@ -5,5 +5,15 @@ Download images from reddit.
 ```bash
 go mod tidy
 
-go run main.go
+go run main.go pics oldschoolcool thewaywewere MilitaryPorn EarthPorn
+```
+
+```bash
+docker run --restart unless-stopped \
+  -v ${PWD}/subreddits:/data/subreddits \
+  ghcr.io/cwpearson/reimager --every 1800 --out-dir /data/subreddits \
+    pics \
+    EarthPorn \
+    oldschoolcool \
+    thewaywewere
 ```

main.go

@@ -1,7 +1,10 @@
 package main
 
 import (
+	"flag"
+	"fmt"
 	"log"
+	"os"
 	"time"
 
 	"github.com/cwpearson/reddit-images/rate_limit"
@@ -10,12 +13,16 @@ import (
 
 func main() {
 
-	subreddits := []string{
+	// Define and parse flags
-		"pics",
+	every := flag.Int64("every", 60*30, "Optional: Run every N seconds")
-		"oldschoolcool",
+	outDir := flag.String("out-dir", "subreddits", "Optional: Output directory path")
-		"thewaywewere",
+	flag.Parse()
-		"MilitaryPorn",
+
-		"EarthPorn",
+	subreddits := flag.Args()
+	if len(subreddits) == 0 {
+		fmt.Fprintf(os.Stderr, "Error: At least one string argument is required\n\n")
+		fmt.Fprintf(os.Stderr, "Usage: %s [--every N] [--out-dir path] string1 [string2 ...]\n", os.Args[0])
+		os.Exit(1)
 	}
 
 	rl := rate_limit.NewRateLimit()
@@ -23,10 +30,10 @@ func main() {
 	for {
 		for _, subreddit := range subreddits {
 			r := reddit.NewReddit(rl, subreddit)
-			r.Get()
+			r.Get(*outDir)
 		}
 
-		when := time.Now().Add(time.Minute * time.Duration(30))
+		when := time.Now().Add(time.Second * time.Duration(*every))
 		log.Println("sleep until", when)
 		time.Sleep(time.Until(when))
 	}

reddit/reddit.go

@@ -117,11 +117,11 @@ func getImage(rl *rate_limit.RateLimit, url, outDir, stem string) error {
 	return os.WriteFile(outPath, contents, 0644)
 }
 
-func (r *Reddit) Get() {
+func (r *Reddit) Get(outDir string) {
 	var children []ChildData
 	var err error
 
-	outDir := filepath.Join("subreddits", r.subreddit)
+	outDir = filepath.Join(outDir, r.subreddit)
 	err = os.MkdirAll(outDir, 0755)
 	if err != nil && !os.IsExist(err) {
 		log.Println("ERROR: couldn't create out directory", outDir)
@@ -173,7 +173,7 @@ func (r *Reddit) Get() {
 				if len(parts) == 2 {
 					imgUrl := fmt.Sprintf("https://i.redd.it/%s.%s", meta.Id, parts[1])
 
-					stem := fmt.Sprintf("%d_%s_%d_%s", int64(child.Created), shortTitle, mi, meta.Id)
+					stem := fmt.Sprintf("%d_%s_%s", int64(child.Created), shortTitle, meta.Id)
 
 					if _, ok := existing[stem]; ok {
 						log.Println(stem, "already downloaded")