1 files changed, 111 insertions, 0 deletions
diff --git a/vendor/terminal_size/src/unix.rs b/vendor/terminal_size/src/unix.rs
new file mode 100644
index 000000000..59af979d0
--- /dev/null
+++ b/vendor/terminal_size/src/unix.rs
@@ -0,0 +1,111 @@
+use super::{Height, Width};
+use std::os::unix::io::RawFd;
+use rustix::fd::BorrowedFd;
+
+/// Returns the size of the terminal defaulting to STDOUT, if available.
+///
+/// If STDOUT is not a tty, returns `None`
+pub fn terminal_size() -> Option<(Width, Height)> {
+    terminal_size_using_fd(rustix::io::raw_stdout())
+}
+
+/// Returns the size of the terminal using the given file descriptor, if available.
+///
+/// If the given file descriptor is not a tty, returns `None`
+pub fn terminal_size_using_fd(fd: RawFd) -> Option<(Width, Height)> {
+    use rustix::termios::{isatty, tcgetwinsize};
+
+    // TODO: Once I/O safety is stabilized, the enlosing function here should
+    // be unsafe due to taking a `RawFd`. We should then move the main
+    // logic here into a new function which takes a `BorrowedFd` and is safe.
+    let fd = unsafe { BorrowedFd::borrow_raw(fd) };
+
+    if !isatty(fd) {
+        return None;
+    }
+
+    let winsize = tcgetwinsize(fd).ok()?;
+
+    let rows = winsize.ws_row;
+    let cols = winsize.ws_col;
+
+    if rows > 0 && cols > 0 {
+        Some((Width(cols), Height(rows)))
+    } else {
+        None
+    }
+}
+
+#[test]
+/// Compare with the output of `stty size`
+fn compare_with_stty() {
+    use std::process::Command;
+    use std::process::Stdio;
+
+    let (rows, cols) = if cfg!(target_os = "illumos") {
+        // illumos stty(1) does not accept a device argument, instead using
+        // stdin unconditionally:
+        let output = Command::new("stty")
+            .stdin(Stdio::inherit())
+            .output()
+            .unwrap();
+        assert!(output.status.success());
+
+        // stdout includes the row and columns thus: "rows = 80; columns = 24;"
+        let vals = String::from_utf8(output.stdout)
+            .unwrap()
+            .lines()
+            .map(|line| {
+                // Split each line on semicolons to get "k = v" strings:
+                line.split(';')
+                    .map(str::trim)
+                    .map(str::to_string)
+                    .collect::<Vec<_>>()
+            })
+            .flatten()
+            .filter_map(|term| {
+                // split each "k = v" string and look for rows/columns:
+                match term.splitn(2, " = ").collect::<Vec<_>>().as_slice() {
+                    ["rows", n] | ["columns", n] => Some(n.parse().unwrap()),
+                    _ => None,
+                }
+            })
+            .collect::<Vec<_>>();
+        (vals[0], vals[1])
+    } else {
+        let output = if cfg!(target_os = "linux") {
+            Command::new("stty")
+                .arg("size")
+                .arg("-F")
+                .arg("/dev/stderr")
+                .stderr(Stdio::inherit())
+                .output()
+                .unwrap()
+        } else {
+            Command::new("stty")
+                .arg("-f")
+                .arg("/dev/stderr")
+                .arg("size")
+                .stderr(Stdio::inherit())
+                .output()
+                .unwrap()
+        };
+
+        assert!(output.status.success());
+        let stdout = String::from_utf8(output.stdout).unwrap();
+        // stdout is "rows cols"
+        let mut data = stdout.split_whitespace();
+        println!("{}", stdout);
+        let rows = u16::from_str_radix(data.next().unwrap(), 10).unwrap();
+        let cols = u16::from_str_radix(data.next().unwrap(), 10).unwrap();
+        (rows, cols)
+    };
+    println!("{} {}", rows, cols);
+
+    if let Some((Width(w), Height(h))) = terminal_size() {
+        assert_eq!(rows, h);
+        assert_eq!(cols, w);
+    } else {
+        panic!("terminal_size() return None");
+    }
+}