Implemented prompt expansion, and display for errors

src/prompt/mod.rs

@@ -6,9 +6,9 @@ use std::path::Path;
 use readline::FernReadline;
 use rustyline::{error::ReadlineError, history::FileHistory, Editor};
 
-use crate::{libsh::{error::ShResult, term::{Style, Styled}}, prelude::*};
+use crate::{expand::expand_prompt, libsh::{error::ShResult, term::{Style, Styled}}, prelude::*};
 
-fn init_rl<'s>() -> ShResult<Editor<FernReadline,FileHistory>> {
+fn init_rl() -> ShResult<Editor<FernReadline,FileHistory>> {
 	let rl = FernReadline::new();
 	let mut editor = Editor::new()?;
 	editor.set_helper(Some(rl));
@@ -16,15 +16,35 @@ fn init_rl<'s>() -> ShResult<Editor<FernReadline,FileHistory>> {
 	Ok(editor)
 }
 
-pub fn read_line<'s>() -> ShResult<String> {
+fn get_prompt() -> ShResult<String> {
+	let Ok(prompt) = env::var("PS1") else {
+		return Ok("$ ".styled(Style::Green | Style::Bold))
+	};
+
+	Ok(format!("\n{}",expand_prompt(&prompt)?))
+}
+
+fn get_hist_path() -> ShResult<PathBuf> {
+	if let Ok(path) = env::var("FERN_HIST") {
+		Ok(PathBuf::from(path))
+	} else {
+		let home = env::var("HOME")?;
+		Ok(PathBuf::from(format!("{home}/.fernhist")))
+	}
+
+}
+
+pub fn read_line() -> ShResult<String> {
 	assert!(isatty(STDIN_FILENO).unwrap());
 	let mut editor = init_rl()?;
-	let prompt = "$ ".styled(Style::Green | Style::Bold);
+	let prompt = get_prompt()?;
 	match editor.readline(&prompt) {
 		Ok(line) => {
 			if !line.is_empty() {
+				let hist_path = get_hist_path()?;
+				flog!(DEBUG, hist_path);
 				editor.add_history_entry(&line)?;
-				editor.save_history(&Path::new("/home/pagedmov/.fernhist"))?;
+				editor.save_history(&hist_path)?;
 			}
 			Ok(line)
 		}