Fix piping to Helix on macOS (#5468)

Cargo.lock

@@ -263,6 +263,7 @@ checksum = "a84cda67535339806297f1b331d6dd6320470d2a0fe65381e79ee9e156dd3d13"
 dependencies = [
  "bitflags 1.3.2",
  "crossterm_winapi",
+ "filedescriptor",
  "futures-core",
  "libc",
  "mio",
@@ -427,6 +428,17 @@ dependencies = [
  "log",
 ]
 
+[[package]]
+name = "filedescriptor"
+version = "0.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7199d965852c3bac31f779ef99cbb4537f80e952e2d6aa0ffeb30cce00f4f46e"
+dependencies = [
+ "libc",
+ "thiserror",
+ "winapi",
+]
+
 [[package]]
 name = "filetime"
 version = "0.2.21"

helix-term/Cargo.toml

@@ -70,6 +70,9 @@ grep-searcher = "0.1.11"
 signal-hook-tokio = { version = "0.3", features = ["futures-v0_3"] }
 libc = "0.2.147"
 
+[target.'cfg(target_os = "macos")'.dependencies]
+crossterm = { version = "0.26", features = ["event-stream", "use-dev-tty"] }
+
 [build-dependencies]
 helix-loader = { version = "0.6", path = "../helix-loader" }
 

helix-term/src/application.rs

@@ -211,11 +211,6 @@ impl Application {
             }
         } else if stdin().is_tty() || cfg!(feature = "integration") {
             editor.new_file(Action::VerticalSplit);
-        } else if cfg!(target_os = "macos") {
-            // On Linux and Windows, we allow the output of a command to be piped into the new buffer.
-            // This doesn't currently work on macOS because of the following issue:
-            //   https://github.com/crossterm-rs/crossterm/issues/500
-            anyhow::bail!("Piping into helix-term is currently not supported on macOS");
         } else {
             editor
                 .new_file_from_stdin(Action::VerticalSplit)