3 files changed, 12 insertions, 5 deletions

diff --git a/Cargo.toml b/Cargo.toml
index 4523192..8c10596 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -12,7 +12,7 @@ categories = ["command-line-interface", "science", "parser-implementations"]
 license = "MIT"
 
 [dependencies]
-rustyline   = "3.0.0"
+rustyline   = "4.0.0"
 clap        = "2.32.0"
 radix_fmt   = "0.1.1"
 lazy_static = "1.3.0"
diff --git a/readme.md b/readme.md
index ea96c76..2c1998a 100644
--- a/readme.md
+++ b/readme.md
@@ -23,7 +23,7 @@ $ cargo run
 ### usage
 
 ```shell
-eva 0.2.3
+eva 0.2.4
 NerdyPepper <[email protected]>
 Calculator REPL similar to bc(1)
 
@@ -36,10 +36,12 @@ FLAGS:
     -V, --version    Prints version information
 
 OPTIONS:
-    -f, --fix <FIX>    set number of decimal places in the output
+    -b, --base <RADIX>    set the radix of calculation output (2, 8, 10, 16 etc.)
+    -f, --fix <FIX>       set number of decimal places in the output
 
 ARGS:
     <INPUT>    optional expression string to run eva in command mode
+
 ```
 
 type out an expression and hit enter, repeat.
diff --git a/src/main.rs b/src/main.rs
index 5846a87..ffdb690 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -20,10 +20,14 @@ use crate::format::*;
 // extern crates
 use rustyline::error::ReadlineError;
 use rustyline::Editor;
-use rustyline::config::{ Builder, ColorMode, EditMode };
+use rustyline::config::{ Builder, ColorMode, EditMode, CompletionType };
+use rustyline::highlight::{ Highlighter, MatchingBracketHighlighter };
+use rustyline::hint::{ Hinter, HistoryHinter };
 use clap::{Arg, App};
 use lazy_static::lazy_static;
 
+struct LineHelper (MatchingBracketHighlighter, HistoryHinter);
+
 struct Configuration {
     radian_mode: bool,
     fix: usize,
@@ -50,6 +54,7 @@ fn main() {
         let config = config_builder.color_mode(ColorMode::Enabled)
             .edit_mode(EditMode::Emacs)
             .history_ignore_space(true)
+            .completion_type(CompletionType::Circular)
             .max_history_size(1000)
             .build();
         let mut rl = Editor::<()>::with_config(config);
@@ -102,7 +107,7 @@ fn parse_arguments() -> Configuration {
              .long("base")
              .takes_value(true)
              .value_name("RADIX")
-             .help("set the radix of calculation output (2, 8, 10, 16 etc.)"))
+             .help("set the radix of calculation output (1 - 36)"))
         .arg(Arg::with_name("INPUT")
              .help("optional expression string to run eva in command mode")
              .index(1))