feat(plugins): add Command.which(cmd) function

Cargo.lock

@@ -3398,6 +3398,7 @@ dependencies = [
  "tracing",
  "unicode-width 0.2.0",
  "uzers",
+ "which",
  "yazi-adapter",
  "yazi-boot",
  "yazi-config",

yazi-plugin/Cargo.toml

@@ -39,6 +39,7 @@ tokio-stream  = { workspace = true }
 tokio-util    = { workspace = true }
 tracing       = { workspace = true }
 unicode-width = { workspace = true }
+which = "6.0.3"
 yazi-prebuild = "0.1.2"
 
 [target."cfg(unix)".dependencies]

yazi-plugin/src/process/command.rs

@@ -23,12 +23,17 @@ impl Command {
 			Ok(Self { inner })
 		})?;
 
+		let which = lua.create_function(|_, (program,): (String,)| {
+			Ok(which::which(program).ok().and_then(|path| path.to_str().map(str::to_string)))
+		})?;
+
 		let command = lua.create_table_from([
 			// Stdio
 			("NULL", NULL),
 			("PIPED", PIPED),
 			("INHERIT", INHERIT),
 		])?;
+		command.raw_set("which", which)?;
 
 		command.set_metatable(Some(lua.create_table_from([("__call", new)])?));