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use indexmap::IndexMap; use nu_errors::ShellError; use nu_source::Text; use std::ffi::OsString; use std::fmt::Debug; use super::basic_host::BasicHost; pub trait Host: Debug + Send { fn stdout(&mut self, out: &str); fn stderr(&mut self, out: &str); fn print_err(&mut self, err: ShellError, source: &Text); fn vars(&mut self) -> Vec<(String, String)>; fn env_get(&mut self, key: OsString) -> Option<OsString>; fn env_set(&mut self, k: OsString, v: OsString); fn env_rm(&mut self, k: OsString); fn width(&self) -> usize; fn height(&self) -> usize; fn is_external_cmd(&self, cmd_name: &str) -> bool; } impl Default for Box<dyn Host> { fn default() -> Self { Box::new(BasicHost) } } impl Host for Box<dyn Host> { fn stdout(&mut self, out: &str) { (**self).stdout(out) } fn stderr(&mut self, out: &str) { (**self).stderr(out) } fn print_err(&mut self, err: ShellError, source: &Text) { (**self).print_err(err, source) } fn vars(&mut self) -> Vec<(String, String)> { (**self).vars() } fn env_get(&mut self, key: OsString) -> Option<OsString> { (**self).env_get(key) } fn env_set(&mut self, key: OsString, value: OsString) { (**self).env_set(key, value); } fn env_rm(&mut self, key: OsString) { (**self).env_rm(key) } fn width(&self) -> usize { (**self).width() } fn height(&self) -> usize { (**self).height() } fn is_external_cmd(&self, name: &str) -> bool { (**self).is_external_cmd(name) } } #[derive(Debug)] pub struct FakeHost { line_written: String, env_vars: IndexMap<String, String>, } impl FakeHost { pub fn new() -> FakeHost { FakeHost { line_written: String::from(""), env_vars: IndexMap::default(), } } } impl Default for FakeHost { fn default() -> Self { FakeHost::new() } } impl Host for FakeHost { fn stdout(&mut self, out: &str) { self.line_written = out.to_string(); } fn stderr(&mut self, out: &str) { self.line_written = out.to_string(); } fn print_err(&mut self, err: ShellError, source: &Text) { BasicHost {}.print_err(err, source); } fn vars(&mut self) -> Vec<(String, String)> { self.env_vars .iter() .map(|(k, v)| (k.clone(), v.clone())) .collect::<Vec<_>>() } fn env_get(&mut self, key: OsString) -> Option<OsString> { let key = key.into_string().expect("Couldn't convert to string."); self.env_vars.get(&key).map(OsString::from) } fn env_set(&mut self, key: OsString, value: OsString) { self.env_vars.insert( key.into_string().expect("Couldn't convert to string."), value.into_string().expect("Couldn't convert to string."), ); } fn env_rm(&mut self, key: OsString) { self.env_vars .shift_remove(&key.into_string().expect("Couldn't convert to string.")); } fn width(&self) -> usize { 1 } fn height(&self) -> usize { 1 } fn is_external_cmd(&self, _: &str) -> bool { true } }