add simple mux command

.gitignore

@@ -0,0 +1,2 @@
+target/
+result

flake.nix

@@ -20,9 +20,10 @@
           devShells = with pkgs; {
             default = mkShell
               {
-                buildInputs = [
+                buildInputs = with gst_all_1; [
                   rust-bin.nightly.latest.default
                   rust-analyzer
+                  ffmpeg
                 ];
               };
             bare = mkShell
@@ -47,6 +48,9 @@
             nativeBuildInputs = with pkgs; [
               rust-bin.nightly.latest.default
             ];
+            buildInputs = with pkgs; [
+              ffmpeg
+            ];
             cargoSha256 = "sha256-DhWWUNDpDsao6lOogoM5UfUgrUfEmZvCpY0pxmr4/mI=";
           };
         }

general.rs

@@ -0,0 +1,9 @@
+use serenity::framework::standard::{macros::command, CommandResult};
+use serenity::model::prelude::*;
+use serenity::prelude::*;
+
+#[command]
+pub async fn ping(ctx: &Context, msg: &Message) -> CommandResult {
+    msg.reply(ctx, "Pong!").await?;
+    Ok(())
+}

src/commands/general.rs

@@ -0,0 +1,9 @@
+use serenity::framework::standard::{macros::command, CommandResult};
+use serenity::model::prelude::*;
+use serenity::prelude::*;
+
+#[command]
+pub async fn ping(ctx: &Context, msg: &Message) -> CommandResult {
+    msg.reply(ctx, "Pong!").await?;
+    Ok(())
+}

src/commands/mod.rs

@@ -0,0 +1,2 @@
+pub mod general;
+pub mod transcode;

src/commands/transcode.rs

@@ -0,0 +1,71 @@
+use crate::lib::ffmpeg::FfmpegTranscode;
+use serenity::{
+    framework::standard::{macros::command, Args, CommandResult},
+    http::AttachmentType,
+    model::prelude::*,
+    prelude::*,
+};
+use std::{fs::remove_file, path::Path, process::ExitStatus};
+use tokio::fs::File;
+
+#[command]
+#[aliases("mux")]
+pub async fn remux(ctx: &Context, msg: &Message, args: Args) -> CommandResult {
+    let q: Vec<&str> = args.raw().collect::<Vec<&str>>();
+    if q.len() < 2 || q.len() > 4 {
+        msg.reply(
+            ctx,
+            "Please use the proper syntax: `xxremux <audio> <video> [audio_codec] [video_codec]` or attach something",
+        )
+        .await?;
+        return Ok(());
+    }
+
+    let mut trans = FfmpegTranscode::default();
+
+    trans.add_input(q[0]).add_input(q[1]);
+
+    if q.len() > 2 {
+        trans.set_acodec(q[2]);
+    }
+
+    if q.len() > 3 {
+        trans.set_vcodec(q[3]);
+    }
+
+    let ext = Path::new(&q[1]).extension().unwrap().to_str().unwrap();
+    let output = format!("/tmp/{}{}.{}", "singh4-", msg.id, ext);
+
+    trans
+        .add_flag("shortest")
+        .set_output(&output)
+        .add_arg("map", "0:a:0")
+        .add_arg("map", "1:v:0");
+
+    let mut m = msg.reply_ping(ctx, "Working").await?;
+    let exit_code: ExitStatus = trans.run();
+    let file: File = File::open(&output).await?;
+
+    if !exit_code.success() {
+        msg.reply(ctx, "Some error occurred, please check the inputs")
+            .await?;
+    } else if file.metadata().await.unwrap().len() > 8 * 1024 * 1024 {
+        msg.reply(ctx, "Output file larger than 8 MB").await?;
+    } else {
+        m.edit(ctx, |m| m.content("Uploading")).await?;
+        msg.channel_id
+            .send_message(ctx, |m| {
+                m.add_file(AttachmentType::File {
+                    file: &file,
+                    filename: format!("{}.{}", msg.id, ext),
+                })
+                .content(msg.author.mention())
+            })
+            .await?;
+        m.delete(ctx).await?;
+    }
+
+    remove_file(output)?;
+
+    Ok(())
+}

src/lib/ffmpeg.rs

@@ -0,0 +1,84 @@
+use std::process::{Command, ExitStatus};
+
+//Helper lib for running ffmpeg using std::process::Command
+
+fn sanitize_arg<V: Into<String>>(value: V) -> String {
+    let v: String = value.into();
+    if v.starts_with('-') {
+        v
+    } else {
+        format!("-{}", v)
+    }
+}
+
+#[derive(Clone, Debug)]
+pub struct FfmpegTranscode {
+    args: Vec<String>,
+    out: String,
+    acodec: String,
+    vcodec: String,
+}
+
+impl Default for FfmpegTranscode {
+    fn default() -> Self {
+        FfmpegTranscode {
+            args: vec![],
+            out: String::from("/tmp/ffmpeg"),
+            acodec: String::from("copy"),
+            vcodec: String::from("copy"),
+        }
+    }
+}
+
+impl FfmpegTranscode {
+    pub fn add_flag<V: Into<String>>(&mut self, value: V) -> &mut Self {
+        self.args.push(sanitize_arg(value));
+        self
+    }
+
+    pub fn add_flags<T: Into<String>, V: IntoIterator<Item = T>>(&mut self, value: V) -> &mut Self {
+        for v in value {
+            self.add_flag(v);
+        }
+        self
+    }
+
+    pub fn add_arg<K: Into<String>, V: ToString>(&mut self, key: K, value: V) -> &mut Self {
+        self.args.push(sanitize_arg(key));
+        self.args.push(value.to_string());
+        self
+    }
+
+    pub fn add_input<V: ToString>(&mut self, input: V) -> &mut Self {
+        self.add_arg('i', input)
+    }
+
+    pub fn set_output<V: ToString>(&mut self, output: V) -> &mut Self {
+        self.out = output.to_string();
+        self
+    }
+
+    pub fn set_acodec<V: ToString>(&mut self, acodec: V) -> &mut Self {
+        self.acodec = acodec.to_string();
+        self
+    }
+
+    pub fn set_vcodec<V: ToString>(&mut self, vcodec: V) -> &mut Self {
+        self.vcodec = vcodec.to_string();
+        self
+    }
+
+    pub fn add_map(&mut self, inp: i32, s: char, out: i32) -> &mut Self {
+        self.add_arg("map", format!("{}:{}:{}", inp, s, out))
+    }
+
+    pub fn run(&self) -> ExitStatus {
+        Command::new("ffmpeg")
+            .args(&self.args)
+            .args(vec!["-c:a", &self.acodec])
+            .args(vec!["-c:v", &self.vcodec])
+            .arg(&self.out)
+            .status()
+            .expect("FFmpeg failed to run")
+    }
+}

src/lib/mod.rs

@@ -0,0 +1 @@
+pub mod ffmpeg;

src/main.rs

@@ -1,11 +1,15 @@
+mod commands;
 mod handler;
+mod lib;
+use commands::general::*;
+use commands::transcode::*;
 use handler::Handler;
 use serenity::{
     client::bridge::gateway::ShardManager,
     framework::{
         standard::{
             help_commands,
-            macros::help,
+            macros::{group, help},
             Args, CommandGroup, CommandResult, HelpOptions,
         },
         StandardFramework,
@@ -22,6 +26,14 @@ impl TypeMapKey for ShardManagerContainer {
     type Value = Arc<Mutex<ShardManager>>;
 }
 
+#[group]
+#[commands(remux)]
+struct Transcode;
+
+#[group]
+#[commands(ping)]
+struct General;
+
 #[help]
 #[max_levenshtein_distance(2)]
 #[indention_prefix = "+"]
@@ -56,8 +68,10 @@ async fn main() {
     };
 
     let framework = StandardFramework::new()
-        .configure(|c| c.owners(owners).prefix(","))
-        .help(&MY_HELP);
+        .configure(|c| c.owners(owners).prefix("xx"))
+        .help(&MY_HELP)
+        .group(&GENERAL_GROUP)
+        .group(&TRANSCODE_GROUP);
 
     let mut client = Client::builder(&token)
         .framework(framework)