Initial commit for fern

src/prompt/mod.rs

@@ -0,0 +1,46 @@
+use crate::prelude::*;
+use readline::SynHelper;
+use rustyline::{config::Configurer, history::DefaultHistory, ColorMode, CompletionType, Config, DefaultEditor, EditMode, Editor};
+
+pub mod readline;
+pub mod highlight;
+
+fn init_rl<'a>(shenv: &'a mut ShEnv) -> Editor<SynHelper<'a>, DefaultHistory> {
+	let hist_path = std::env::var("FERN_HIST").unwrap_or_default();
+	let mut config = Config::builder()
+		.max_history_size(1000).unwrap()
+		.history_ignore_dups(true).unwrap()
+		.completion_prompt_limit(100)
+		.edit_mode(EditMode::Vi)
+		.color_mode(ColorMode::Enabled)
+		.tab_stop(2)
+		.build();
+
+	let mut editor = Editor::with_config(config).unwrap();
+	editor.set_completion_type(CompletionType::List);
+	editor.set_helper(Some(SynHelper::new(shenv)));
+	if !hist_path.is_empty() {
+		editor.load_history(&PathBuf::from(hist_path)).unwrap();
+	}
+	editor
+}
+
+pub fn read_line<'a>(shenv: &'a mut ShEnv) -> ShResult<String> {
+	log!(TRACE, "Entering prompt");
+	let prompt = &style_text("$ ", Style::Green | Style::Bold);
+	let mut editor = init_rl(shenv);
+	match editor.readline(prompt) {
+		Ok(line) => Ok(line),
+		Err(rustyline::error::ReadlineError::Eof) => {
+			kill(Pid::this(), Signal::SIGQUIT)?;
+			Ok(String::new())
+		}
+		Err(rustyline::error::ReadlineError::Interrupted) => {
+			Ok(String::new())
+		}
+		Err(e) => {
+			log!(ERROR, e);
+			Err(e.into())
+		}
+	}
+}