use std::{io::Write, time::Duration}; use anyhow::bail; use crossterm::event::{Event, KeyEvent}; use helix_core::{test, Selection, Transaction}; use helix_term::{application::Application, args::Args, config::Config}; use helix_view::{doc, input::parse_macro}; use tempfile::NamedTempFile; use tokio_stream::wrappers::UnboundedReceiverStream; #[derive(Clone, Debug)] pub struct TestCase { pub in_text: String, pub in_selection: Selection, pub in_keys: String, pub out_text: String, pub out_selection: Selection, } impl> From<(S, S, S)> for TestCase { fn from((input, keys, output): (S, S, S)) -> Self { let (in_text, in_selection) = test::print(&input.into()); let (out_text, out_selection) = test::print(&output.into()); TestCase { in_text, in_selection, in_keys: keys.into(), out_text, out_selection, } } } #[inline] pub async fn test_key_sequence( app: &mut Application, in_keys: Option<&str>, test_fn: Option<&dyn Fn(&Application)>, ) -> anyhow::Result<()> { test_key_sequences(app, vec![(in_keys, test_fn)]).await } #[allow(clippy::type_complexity)] pub async fn test_key_sequences( app: &mut Application, inputs: Vec<(Option<&str>, Option<&dyn Fn(&Application)>)>, ) -> anyhow::Result<()> { const TIMEOUT: Duration = Duration::from_millis(500); let (tx, rx) = tokio::sync::mpsc::unbounded_channel(); let mut rx_stream = UnboundedReceiverStream::new(rx); for (in_keys, test_fn) in inputs { if let Some(in_keys) = in_keys { for key_event in parse_macro(in_keys)?.into_iter() { tx.send(Ok(Event::Key(KeyEvent::from(key_event))))?; } } if !app.event_loop_until_idle(&mut rx_stream).await { bail!("application exited before test function could run"); } if let Some(test) = test_fn { test(app); }; } for key_event in parse_macro(":q!")?.into_iter() { tx.send(Ok(Event::Key(KeyEvent::from(key_event))))?; } let event_loop = app.event_loop(&mut rx_stream); tokio::time::timeout(TIMEOUT, event_loop).await?; app.close().await?; Ok(()) } pub async fn test_key_sequence_with_input_text>( app: Option, test_case: T, test_fn: &dyn Fn(&Application), ) -> anyhow::Result<()> { let test_case = test_case.into(); let mut app = match app { Some(app) => app, None => Application::new(Args::default(), Config::default())?, }; let (view, doc) = helix_view::current!(app.editor); let sel = doc.selection(view.id).clone(); // replace the initial text with the input text doc.apply( &Transaction::change_by_selection(doc.text(), &sel, |_| { (0, doc.text().len_chars(), Some((&test_case.in_text).into())) }) .with_selection(test_case.in_selection.clone()), view.id, ); test_key_sequence(&mut app, Some(&test_case.in_keys), Some(test_fn)).await } /// Use this for very simple test cases where there is one input /// document, selection, and sequence of key presses, and you just /// want to verify the resulting document and selection. pub async fn test_with_config>( args: Args, config: Config, test_case: T, ) -> anyhow::Result<()> { let test_case = test_case.into(); let app = Application::new(args, config)?; test_key_sequence_with_input_text(Some(app), test_case.clone(), &|app| { let doc = doc!(app.editor); assert_eq!(&test_case.out_text, doc.text()); let mut selections: Vec<_> = doc.selections().values().cloned().collect(); assert_eq!(1, selections.len()); let sel = selections.pop().unwrap(); assert_eq!(test_case.out_selection, sel); }) .await } pub async fn test>(test_case: T) -> anyhow::Result<()> { test_with_config(Args::default(), Config::default(), test_case).await } pub fn temp_file_with_contents>( content: S, ) -> anyhow::Result { let mut temp_file = tempfile::NamedTempFile::new()?; temp_file .as_file_mut() .write_all(content.as_ref().as_bytes())?; temp_file.flush()?; temp_file.as_file_mut().sync_all()?; Ok(temp_file) } /// Replaces all LF chars with the system's appropriate line feed /// character, and if one doesn't exist already, appends the system's /// appropriate line ending to the end of a string. pub fn platform_line(input: &str) -> String { let line_end = helix_core::DEFAULT_LINE_ENDING.as_str(); // we can assume that the source files in this code base will always // be LF, so indoc strings will always insert LF let mut output = input.replace('\n', line_end); if !output.ends_with(line_end) { output.push_str(line_end); } output } /// Creates a new temporary file that is set to read only. Useful for /// testing write failures. pub fn new_readonly_tempfile() -> anyhow::Result { let mut file = tempfile::NamedTempFile::new()?; let metadata = file.as_file().metadata()?; let mut perms = metadata.permissions(); perms.set_readonly(true); file.as_file_mut().set_permissions(perms)?; Ok(file) }