Support VSCode and --edit-cmd as editor

src/editor/zellij.rs

@@ -0,0 +1,62 @@
+use std::process::{Command, Stdio};
+
+use anyhow::{Context, Result, bail};
+use serde::Deserialize;
+
+#[derive(Deserialize)]
+struct Pane {
+    id: u32,
+}
+
+pub fn parse_pane_id(b: &[u8]) -> Option<(String, u32)> {
+    // Remove newline
+    let b = b.get("terminal_".len()..b.len().saturating_sub(1))?;
+    let id_str = str::from_utf8(b).ok()?;
+
+    let (first, rest) = b.split_first()?;
+    let mut id = u32::from(first - b'0');
+
+    for c in rest {
+        id = 10 * id + u32::from(c - b'0');
+    }
+
+    Some((id_str.to_owned(), id))
+}
+
+pub fn pane_open(pane_id: u32) -> Result<bool> {
+    let mut output = Command::new("zellij")
+        .arg("action")
+        .arg("list-panes")
+        .arg("-j")
+        .stdin(Stdio::null())
+        .stderr(Stdio::null())
+        .output()
+        .context("Failed to run `zellij action list-panes -j`")?;
+
+    if !output.status.success() {
+        bail!("`zellij action list-panes -j` didn't exit successfully");
+    }
+
+    // Remove newline
+    output.stdout.pop();
+
+    let panes = serde_json::de::from_slice::<Vec<Pane>>(&output.stdout)
+        .context("Failed to parse the output of `zellij action list-panes -j`")?;
+
+    Ok(panes.iter().any(|pane| pane.id == pane_id))
+}
+
+pub fn close_pane(pane_id: &str) -> Result<()> {
+    Command::new("zellij")
+        .arg("action")
+        .arg("close-pane")
+        .arg("-p")
+        .arg(pane_id)
+        .stdin(Stdio::null())
+        .stdout(Stdio::null())
+        .stderr(Stdio::null())
+        .status()
+        .context("Failed to run `zellij action close-pane -p ID`")?;
+
+    Ok(())
+}