args: add --print-streams arg

Just takes the same path as when a quality isn't set

README.md

@@ -58,6 +58,7 @@ servers=https://eu.luminous.dev/live/[channel],https://lb-eu.cdn-perfprod.com/li
 debug=true
 quiet=true
 passthrough=false
+print-streams=false
 no-low-latency=false
 no-kill=false
 force-https=true

src/args.rs

@@ -16,19 +16,24 @@ pub struct Args {
     pub hls: HlsArgs,
     pub debug: bool,
     pub passthrough: bool,
+    pub print_streams: bool,
     pub quality: Option<String>,
 }
 
 impl ArgParser for Args {
     fn parse(&mut self, parser: &mut Parser) -> Result<()> {
         parser.parse_switch_or(&mut self.debug, "-d", "--debug")?;
         parser.parse_switch(&mut self.passthrough, "--passthrough")?;
+        parser.parse_switch(&mut self.print_streams, "--print-streams")?;
 
         self.http.parse(parser)?;
         self.player.parse(parser)?;
         self.hls.parse(parser)?;
 
-        parser.parse_free(&mut self.quality, "quality")?;
+        if !self.print_streams {
+            parser.parse_free(&mut self.quality, "quality")?;
+        }
+
         Ok(())
     }
 }

src/usage

@@ -26,6 +26,8 @@ Options:
           Silence player output
       --passthrough
           Passthrough playlist URL to player and do nothing else
+      --print-streams
+          Print available stream qualities and exit
       --no-low-latency
           Disable low latency streaming
       --no-config