🐛 layout: should use oneline layout when pipeline

Signed-off-by: Wei Zhang <kweizh@gmail.com>

src/core.rs

@@ -1,7 +1,7 @@
 use crate::color::Colors;
 use crate::display;
 use crate::flags::{
-    ColorOption, Display, Flags, HyperlinkOption, Layout, Literal, SortOrder, ThemeOption,
+    ColorOption, Display, Flags, Header, HyperlinkOption, Layout, Literal, SortOrder, ThemeOption,
 };
 use crate::git::GitCache;
 use crate::icon::Icons;
@@ -44,8 +44,6 @@ impl Core {
         #[cfg(target_os = "windows")]
         let console_color_ok = crossterm::ansi_support::supports_ansi();
 
-        let mut inner_flags = flags.clone();
-
         let color_theme = match (tty_available && console_color_ok, flags.color.when) {
             (_, ColorOption::Never) | (false, ColorOption::Auto) => ThemeOption::NoColor,
             _ => flags.color.theme.clone(),
@@ -71,9 +69,14 @@ impl Core {
             //
             // Most of the programs does not handle correctly the ansi colors
             // or require a raw output (like the `wc` command).
-            inner_flags.layout = Layout::OneLine;
-
+            flags.header = Header(false);
             flags.literal = Literal(true);
+
+            // GNU ls will set layout to OneLine when not a tty
+            // but lsd support `--tree`, and `--tree` should not be overwrite even piped
+            if flags.layout != Layout::Tree {
+                flags.layout = Layout::OneLine;
+            }
         };
 
         let sorters = sort::assemble_sorters(&flags);

tests/lscompatible.rs

@@ -0,0 +1,55 @@
+extern crate assert_cmd;
+extern crate predicates;
+
+use assert_cmd::prelude::*;
+use assert_fs::prelude::*;
+use std::process::{Command, Stdio};
+
+fn cmd() -> Command {
+    Command::cargo_bin(env!("CARGO_PKG_NAME")).unwrap()
+}
+
+fn tempdir() -> assert_fs::TempDir {
+    assert_fs::TempDir::new().unwrap()
+}
+
+#[test]
+fn test_pipe_should_use_line() {
+    let dir = tempdir();
+    dir.child("one").touch().unwrap();
+    dir.child("two").touch().unwrap();
+
+    let lsd = cmd()
+        .arg("--ignore-config")
+        .arg(dir.path())
+        .stdout(Stdio::piped())
+        .spawn()
+        .expect("Failed to start lsd process");
+    let lsd_out = lsd.stdout.expect("Failed to open ls stdout");
+
+    let cat_lsd = Command::new("cat")
+        .stdin(Stdio::from(lsd_out))
+        .stdout(Stdio::piped())
+        .spawn()
+        .expect("Failed to start cat process");
+    let output_lsd = cat_lsd
+        .wait_with_output()
+        .expect("Failed to wait on cat lsd");
+
+    let ls = Command::new("ls")
+        .arg(dir.path())
+        .stdout(Stdio::piped())
+        .spawn()
+        .expect("Failed to start ls process");
+    let ls_out = ls.stdout.expect("Failed to open ls stdout");
+
+    let cat_ls = Command::new("cat")
+        .stdin(Stdio::from(ls_out))
+        .stdout(Stdio::piped())
+        .spawn()
+        .expect("Failed to start cat process");
+
+    let output_ls = cat_ls.wait_with_output().expect("Failed to wait on cat ls");
+
+    assert_eq!(output_ls.stdout, output_lsd.stdout);
+}