Add support for playback from URL

Also, this fixes #387.

Cargo.lock

@@ -95,6 +95,7 @@ dependencies = [
  "serde",
  "serde_json",
  "signal-hook",
+ "tempfile",
  "termion",
  "uuid",
  "which",
@@ -334,6 +335,12 @@ version = "3.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "281e452d3bad4005426416cdba5ccfd4f5c1280e10099e21db27f7c1c28347fc"
 
+[[package]]
+name = "fastrand"
+version = "2.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "25cbce373ec4653f1a01a31e8a5e5ec0c622dc27ff9c4e6606eefef5cbbed4a5"
+
 [[package]]
 name = "fd-lock"
 version = "4.0.1"
@@ -611,9 +618,9 @@ checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 
 [[package]]
 name = "libc"
-version = "0.2.149"
+version = "0.2.152"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a08173bc88b7955d1b3145aa561539096c421ac8debde8cbc3612ec635fee29b"
+checksum = "13e3bf6590cbc649f4d1a3eefc9d5d6eb746f5200ffb04e5e142700b8faa56e7"
 
 [[package]]
 name = "linux-raw-sys"
@@ -807,13 +814,22 @@ dependencies = [
  "bitflags 1.3.2",
 ]
 
+[[package]]
+name = "redox_syscall"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4722d768eff46b75989dd134e5c353f0d6296e5aaa3132e776cbdb56be7731aa"
+dependencies = [
+ "bitflags 1.3.2",
+]
+
 [[package]]
 name = "redox_termios"
 version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8440d8acb4fd3d277125b4bd01a6f38aee8d814b3b5fc09b3f2b825d37d3fe8f"
 dependencies = [
- "redox_syscall",
+ "redox_syscall 0.2.16",
 ]
 
 [[package]]
@@ -891,15 +907,15 @@ checksum = "d626bb9dae77e28219937af045c257c28bfd3f69333c512553507f5f9798cb76"
 
 [[package]]
 name = "rustix"
-version = "0.38.21"
+version = "0.38.30"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2b426b0506e5d50a7d8dafcf2e81471400deb602392c7dd110815afb4eaf02a3"
+checksum = "322394588aaf33c24007e8bb3238ee3e4c5c09c084ab32bc73890b99ff326bca"
 dependencies = [
  "bitflags 2.4.1",
  "errno",
  "libc",
  "linux-raw-sys",
- "windows-sys 0.48.0",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
@@ -1102,6 +1118,19 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "tempfile"
+version = "3.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "01ce4141aa927a6d1bd34a041795abd0db1cccba5d5f24b009f694bdf3a1f3fa"
+dependencies = [
+ "cfg-if",
+ "fastrand",
+ "redox_syscall 0.4.1",
+ "rustix",
+ "windows-sys 0.52.0",
+]
+
 [[package]]
 name = "termion"
 version = "2.0.1"
@@ -1110,7 +1139,7 @@ checksum = "659c1f379f3408c7e5e84c7d0da6d93404e3800b6b9d063ba24436419302ec90"
 dependencies = [
  "libc",
  "numtoa",
- "redox_syscall",
+ "redox_syscall 0.2.16",
  "redox_termios",
 ]
 

Cargo.toml

@@ -23,3 +23,4 @@ reqwest = { version = "0.11.23", default-features = false, features = ["blocking
 rustyline = "13.0.0"
 config = { version = "0.13.4", default-features = false, features = ["toml", "ini"] }
 which = "5.0.0"
+tempfile = "3.9.0"

src/cmd/play.rs

@@ -1,15 +1,18 @@
 use crate::config::Config;
 use crate::format::asciicast;
 use crate::logger;
-use crate::{
-    player::{self, KeyBindings},
-    tty,
-};
-use anyhow::Result;
+use crate::player::{self, KeyBindings};
+use crate::tty;
+use anyhow::{anyhow, Result};
 use clap::Args;
+use reqwest::Url;
+use std::io;
+use std::path::{Path, PathBuf};
+use tempfile::NamedTempFile;
 
 #[derive(Debug, Args)]
 pub struct Cli {
+    #[arg(value_name = "FILENAME_OR_URL")]
     filename: String,
 
     /// Limit idle time to a given number of seconds
@@ -36,8 +39,10 @@ impl Cli {
 
         logger::info!("Replaying session from {}", self.filename);
 
+        let path = get_path(&self.filename)?;
+
         let ended = loop {
-            let recording = asciicast::open_from_path(&self.filename)?;
+            let recording = asciicast::open_from_path(&path)?;
             let tty = tty::DevTty::open()?;
             let keys = get_key_bindings(config)?;
 
@@ -65,6 +70,39 @@ impl Cli {
     }
 }
 
+enum LocalPath {
+    Normal(PathBuf),
+    Temporary(NamedTempFile),
+}
+
+impl AsRef<Path> for LocalPath {
+    fn as_ref(&self) -> &Path {
+        match self {
+            LocalPath::Normal(p) => p,
+            LocalPath::Temporary(f) => f.path(),
+        }
+    }
+}
+
+fn get_path(filename: &str) -> Result<LocalPath> {
+    if filename.starts_with("https://") || filename.starts_with("http://") {
+        download_asciicast(filename)
+            .map(LocalPath::Temporary)
+            .map_err(|e| anyhow!("download failed: {e}"))
+    } else {
+        Ok(LocalPath::Normal(PathBuf::from(filename)))
+    }
+}
+
+fn download_asciicast(url: &str) -> Result<NamedTempFile> {
+    let mut response = reqwest::blocking::get(Url::parse(url)?)?;
+    response.error_for_status_ref()?;
+    let mut file = NamedTempFile::new()?;
+    io::copy(&mut response, &mut file)?;
+
+    Ok(file)
+}
+
 fn get_key_bindings(config: &Config) -> Result<KeyBindings> {
     let mut keys = KeyBindings::default();