Implement history loading/saving for REPL.

Author: 01mf02

Cargo.lock

@@ -20,13 +20,14 @@ jaq-std  = { version = "2.1.0", path = "../jaq-std" }
 jaq-json = { version = "1.1.1", path = "../jaq-json" }
 
 codesnake = { version = "0.2" }
+dirs = { version = "6.0" }
 env_logger = { version = "0.10.0", default-features = false }
 hifijson = "0.2.0"
 is-terminal = "0.4.13"
 log = { version = "0.4.17" }
 memmap2 = "0.9"
 mimalloc = { version = "0.1.29", default-features = false, optional = true }
-rustyline = { version = "13.0.0", default-features = false }
+rustyline = { version = "13.0.0", default-features = false, features = ["with-file-history"] }
 tempfile = "3.3.0"
 unicode-width = "0.1.13"
 yansi = "1.0.1"

jaq/Cargo.toml

@@ -38,13 +38,17 @@ fn repl_with(depth: usize, f: impl Fn(String)) -> Result<(), ReadlineError> {
         .auto_add_history(true)
         .build();
     let mut rl = DefaultEditor::with_config(config)?;
+    let history = dirs::cache_dir().map(|dir| dir.join("jaq-history"));
+    let _ = history.iter().try_for_each(|h| rl.load_history(h));
     let prompt = format!("{}{} ", str::repeat("  ", depth), '>'.bold());
     loop {
         match rl.readline(&prompt) {
             Ok(line) => f(line),
             Err(ReadlineError::Interrupted) => (),
-            Err(ReadlineError::Eof) => return Ok(()),
+            Err(ReadlineError::Eof) => break,
             Err(err) => Err(err)?,
         }
     }
+    let _ = history.iter().try_for_each(|h| rl.append_history(h));
+    Ok(())
 }