use readline/rustyline instead of stdin.read_line

This gives us a history, nicer editing capabilities and the possibility
to add completion in the future.

2 files changed, 5 insertions, 6 deletions

diff --git a/Cargo.toml b/Cargo.toml
index 2d64d51..2825776 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -26,6 +26,7 @@ dirs = "2.0"
 log = { version = "0.4", features = ["std"] }
 thiserror = "1.0"
 lalrpop-util = "0.18"
+rustyline = "6.1"
 
 [build-dependencies]
 lalrpop = { version = "0.18", features = ["lexer"] }
diff --git a/src/main.rs b/src/main.rs
index ff882e5..b6633ac 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -11,6 +11,7 @@ use chrono::{NaiveDateTime, Weekday};
 use colored::Colorize;
 use log::debug;
 use num_traits::cast::FromPrimitive;
+use rustyline::{error::ReadlineError, Editor};
 use structopt::StructOpt;
 use walkdir::{DirEntry, WalkDir};
 
@@ -231,13 +232,10 @@ fn run() -> Result<()> {
 }
 
 fn repl(opt: &Opt) -> Result<()> {
-    let stdin = std::io::stdin();
+    let mut rl = Editor::<()>::new();
     loop {
-        print!("Query> ");
-        std::io::stdout().flush()?;
-        let mut line = String::new();
-        stdin.read_line(&mut line)?;
-        let line = line.trim();
+        let line = rl.readline("Query> ")?;
+        rl.add_history_entry(&line);
         let parsed = build_filter(&line);
         match parsed {
             Ok(filter) => grep(&opt, &*filter)?,