native status: support HGPLAIN color suppression

Summary: Plus a minor refactoring to use the io::IsTty trait in edenfs_client::status instead of calling into libc directly.

Reviewed By: quark-zju

Differential Revision: D31156633

fbshipit-source-id: 218f06a4e64836be88b4afac98dcfa140373c730

eden/scm/lib/edenfs-client/Cargo.toml

@@ -9,7 +9,6 @@ anyhow = "1.0"
 byteorder = "1.3"
 chrono = { version = "0.4", features = ["clock", "serde", "std"], default-features = false }
 clidispatch = { path = "../clidispatch" }
-libc = "0.2.98"
 sha2 = "0.8"
 thrift-types = { path = "../thrift-types" }
 tokio = { version = "1.10", features = ["full", "test-util", "tracing"] }

eden/scm/lib/edenfs-client/src/status.rs

@@ -10,7 +10,10 @@ use thrift_types::edenfs as eden;
 use crate::path_relativizer::PathRelativizer;
 use anyhow::{bail, ensure, Error, Result};
 use byteorder::{BigEndian, ByteOrder};
-use clidispatch::{errors::FallbackToPython, io::IO};
+use clidispatch::{
+    errors::FallbackToPython,
+    io::{CanColor, IO},
+};
 use eden::client::EdenService;
 use eden::{GetScmStatusParams, GetScmStatusResult, ScmFileStatus, ScmStatus};
 #[cfg(unix)]
@@ -25,7 +28,6 @@ use std::io;
 use std::io::BufReader;
 use std::io::Read;
 #[cfg(unix)]
-use std::os::unix::io::AsRawFd;
 use std::path::Path;
 use std::path::PathBuf;
 use std::str;
@@ -119,7 +121,7 @@ async fn maybe_status_fastpath_internal(
     }
 
     let stdout = io::stdout();
-    let use_color = should_colorize_output(&stdout);
+    let use_color = stdout.can_color();
 
     let status = get_status_helper(
         &client,
@@ -199,18 +201,6 @@ fn needs_morestatus_extension(hg_dir: &Path, p2: &[u8; 20]) -> bool {
     false
 }
 
-#[cfg(unix)]
-fn should_colorize_output(stdout: &dyn AsRawFd) -> bool {
-    let fd = stdout.as_raw_fd();
-    let istty = unsafe { libc::isatty(fd as i32) } != 0;
-    istty
-}
-
-#[cfg(not(unix))]
-fn should_colorize_output(stdout: &io::Stdout) -> bool {
-    false
-}
-
 fn is_unknown_method_error(error: &eden::errors::eden_service::GetScmStatusV2Error) -> bool {
     if let eden::errors::eden_service::GetScmStatusV2Error::ApplicationException(ref e) = error {
         e.type_ == ApplicationExceptionErrorCode::UnknownMethod

eden/scm/lib/io/Cargo.toml

@@ -8,6 +8,7 @@ edition = "2018"
 [dependencies]
 atty = "0.2"
 configmodel = { path = "../configmodel" }
+configparser = { path = "../configparser" }
 once_cell = "1.4"
 parking_lot = "0.10.2"
 pipe = "0.2"

eden/scm/lib/io/src/lib.rs

@@ -90,6 +90,14 @@ pub trait IsTty {
     }
 }
 
+pub trait CanColor: IsTty {
+    fn can_color(&self) -> bool {
+        self.is_tty() && !configparser::hg::is_plain(Some("color"))
+    }
+}
+
+impl<T: IsTty> CanColor for T {}
+
 pub trait Read: io::Read + IsTty + Any + Send + Sync {
     fn as_any(&self) -> &dyn Any;