refactor(get_command): spawn rustyline instance from main()

notes.org

@@ -196,7 +196,15 @@ i will use rustyline, since it seems like the most feature-complete
 
 ** DONE do the impl
 
-** TODO tweak it to make history work
+** TODO make history work
+
+*** DONE have the rl instance be spawned from main
+
+*** TODO figure out how to locate the app data directory on linux
+
+*** TODO create our own app data directory
+
+*** TODO load and save the history from a file in this directory
 
 * TODO handle non-interactive input better
 

src/cli.rs

@@ -1,11 +1,5 @@
-use rustyline::DefaultEditor;
+use rustyline::{Editor, history::FileHistory};
 
-pub fn read_input() -> Option<String> {
-    let mut rl = DefaultEditor::new().ok()?;
-
-    let readline = rl.readline("osdb> ");
-    match readline {
-        Ok(line) => Some(line),
-        Err(_) => None,
-    }
+pub fn read_input(rl: &mut Editor<(), FileHistory>) -> Option<String> {
+    rl.readline("osdb> ").ok()
 }

src/main.rs

@@ -4,9 +4,13 @@ use osdb::error_display::OSDBError as _;
 use osdb::parser::parse;
 
 fn main() {
+    let mut rl = rustyline::DefaultEditor::new().expect("failed to create stdin reader");
+
     println!("{}", startup_msg());
-    'main: while let Some(input) = read_input() {
+
+    'main: while let Some(input) = read_input(&mut rl) {
         let file = String::from("<stdin>");
+
         match parse(file.clone(), input.clone()) {
             Ok(cmds) => {
                 for cmd in cmds {
@@ -24,5 +28,6 @@ fn main() {
             }
         }
     }
+
     println!("Good-bye");
 }

src/parser.rs

@@ -22,11 +22,7 @@ pub fn parse(file: String, input: String) -> Result<Vec<Command>, Vec<CommandPar
             crate::tokens::TokenData::EndOfFile => (),
         }
     }
-    if errs.is_empty() {
-        Ok(cmds)
-    } else {
-        Err(errs)
-    }
+    if errs.is_empty() { Ok(cmds) } else { Err(errs) }
 }
 
 #[cfg(test)]