Write torrent to stdout if - is passed to --output

type: added

src/capture.rs

@@ -17,6 +17,10 @@ impl Capture {
       .unwrap()
       .to_owned()
   }
+
+  pub(crate) fn bytes(&self) -> Vec<u8> {
+    self.cursor.borrow().get_ref().clone()
+  }
 }
 
 impl Write for Capture {

src/common.rs

@@ -49,7 +49,7 @@ pub(crate) use crate::{
   bytes::Bytes, env::Env, error::Error, file_info::FileInfo, files::Files, hasher::Hasher,
   info::Info, lint::Lint, linter::Linter, metainfo::Metainfo, mode::Mode, opt::Opt,
   piece_length_picker::PieceLengthPicker, platform::Platform, style::Style, table::Table,
-  torrent_summary::TorrentSummary, use_color::UseColor,
+  target::Target, torrent_summary::TorrentSummary, use_color::UseColor,
 };
 
 // test stdlib types

src/main.rs

@@ -16,6 +16,7 @@
   clippy::result_expect_used,
   clippy::result_unwrap_used,
   clippy::shadow_reuse,
+  clippy::too_many_lines,
   clippy::unreachable,
   clippy::unseparated_literal_suffix,
   clippy::wildcard_enum_match_arm
@@ -76,6 +77,7 @@ mod platform_interface;
 mod reckoner;
 mod style;
 mod table;
+mod target;
 mod torrent_summary;
 mod use_color;
 

src/opt.rs

@@ -2,19 +2,6 @@ use crate::common::*;
 
 mod torrent;
 
-#[derive(StructOpt)]
-pub(crate) enum Subcommand {
-  Torrent(torrent::Torrent),
-}
-
-impl Subcommand {
-  pub(crate) fn run(self, env: &mut Env, unstable: bool) -> Result<(), Error> {
-    match self {
-      Self::Torrent(torrent) => torrent.run(env, unstable),
-    }
-  }
-}
-
 #[derive(StructOpt)]
 #[structopt(
   about(consts::ABOUT),
@@ -51,3 +38,16 @@ impl Opt {
     self.subcommand.run(env, self.unstable)
   }
 }
+
+#[derive(StructOpt)]
+pub(crate) enum Subcommand {
+  Torrent(torrent::Torrent),
+}
+
+impl Subcommand {
+  pub(crate) fn run(self, env: &mut Env, unstable: bool) -> Result<(), Error> {
+    match self {
+      Self::Torrent(torrent) => torrent.run(env, unstable),
+    }
+  }
+}

src/opt/torrent/create.rs

@@ -47,7 +47,8 @@ Note: Many BitTorrent clients do not implement the behavior described in BEP 12.
     name = "INPUT",
     long = "input",
     help = "Read torrent contents from `INPUT`.",
-    long_help = "Read torrent contents from `INPUT`. If `INPUT` is a file, torrent will be a single-file torrent, otherwise if `INPUT` is a directory, torrent will be a multi-file torrent."
+    long_help = "Read torrent contents from `INPUT`. If `INPUT` is a file, torrent will be a single-file torrent, otherwise if `INPUT` is a directory, torrent will be a multi-file torrent.",
+    parse(from_os_str)
   )]
   input: PathBuf,
   #[structopt(
@@ -85,9 +86,10 @@ Note: Many BitTorrent clients do not implement the behavior described in BEP 12.
   #[structopt(
     name = "OUTPUT",
     long = "output",
-    help = "Save `.torrent` file to `OUTPUT`. Defaults to `$INPUT.torrent`."
+    help = "Save `.torrent` file to `OUTPUT`, or `-` for standard output. Defaults to `$INPUT.torrent`.",
+    parse(from_os_str)
   )]
-  output: Option<PathBuf>,
+  output: Option<Target>,
   #[structopt(
     name = "PIECE-LENGTH",
     long = "piece-length",
@@ -175,12 +177,12 @@ impl Create {
     let output = self
       .output
       .as_ref()
-      .map(|output| env.resolve(&output))
+      .map(|output| output.resolve(env))
       .unwrap_or_else(|| {
         let mut torrent_name = name.to_owned();
         torrent_name.push_str(".torrent");
 
-        input.parent().unwrap().join(torrent_name)
+        Target::File(input.parent().unwrap().join(torrent_name))
       });
 
     let private = if self.private { Some(1) } else { None };
@@ -228,12 +230,15 @@ impl Create {
 
     let bytes = metainfo.serialize()?;
 
-    fs::write(&output, &bytes).context(error::Filesystem { path: &output })?;
-
+    match &output {
+      Target::File(path) => {
+        fs::write(path, &bytes).context(error::Filesystem { path })?;
         TorrentSummary::from_metainfo(metainfo)?.write(env)?;
-
         if self.open {
-      Platform::open(&output)?;
+          Platform::open(&path)?;
+        }
+      }
+      Target::Stdio => env.out.write_all(&bytes).context(error::Stdout)?,
     }
 
     Ok(())
@@ -890,4 +895,21 @@ Content Size  0 bytes
 ";
     assert_eq!(have, want);
   }
+
+  #[test]
+  fn write_to_stdout() {
+    let mut env = environment(&[
+      "--input",
+      "foo",
+      "--announce",
+      "http://bar",
+      "--output",
+      "-",
+    ]);
+    fs::write(env.resolve("foo"), "").unwrap();
+    env.run().unwrap();
+    let bytes = env.out_bytes();
+    let value = bencode::Value::decode(&bytes).unwrap();
+    assert!(matches!(value, bencode::Value::Dict(_)));
+  }
 }

src/opt/torrent/show.rs

@@ -10,7 +10,8 @@ pub(crate) struct Show {
   #[structopt(
     name = "TORRENT",
     long = "input",
-    help = "Show information about `TORRENT`."
+    help = "Show information about `TORRENT`.",
+    parse(from_os_str)
   )]
   input: PathBuf,
 }

src/opt/torrent/stats.rs

@@ -29,7 +29,8 @@ Extract and display values under key paths that match `REGEX`. Subkeys of a benc
     long = "input",
     short = "i",
     help = "Search `INPUT` for torrents.",
-    long_help = "Search `INPUT` for torrents. May be a directory to search or a single torrent file."
+    long_help = "Search `INPUT` for torrents. May be a directory to search or a single torrent file.",
+    parse(from_os_str)
   )]
   input: PathBuf,
   #[structopt(

src/target.rs

@@ -0,0 +1,41 @@
+use crate::common::*;
+
+#[derive(PartialEq, Debug)]
+pub(crate) enum Target {
+  File(PathBuf),
+  Stdio,
+}
+
+impl Target {
+  pub(crate) fn resolve(&self, env: &Env) -> Self {
+    match self {
+      Self::File(path) => Self::File(env.resolve(path)),
+      Self::Stdio => Self::Stdio,
+    }
+  }
+}
+
+impl From<&OsStr> for Target {
+  fn from(text: &OsStr) -> Self {
+    if text == OsStr::new("-") {
+      Self::Stdio
+    } else {
+      Self::File(text.into())
+    }
+  }
+}
+
+#[cfg(test)]
+mod tests {
+  use super::*;
+
+  #[test]
+  fn file() {
+    assert_eq!(Target::from(OsStr::new("foo")), Target::File("foo".into()));
+  }
+
+  #[test]
+  fn stdio() {
+    assert_eq!(Target::from(OsStr::new("-")), Target::Stdio);
+  }
+}

src/test_env.rs

@@ -18,6 +18,10 @@ impl TestEnv {
   pub(crate) fn out(&self) -> String {
     self.out.string()
   }
+
+  pub(crate) fn out_bytes(&self) -> Vec<u8> {
+    self.out.bytes()
+  }
 }
 
 impl Deref for TestEnv {