Use required-features for bin tools.

src/bin/README.md

@@ -3,10 +3,38 @@ Rhai Tools
 
 Tools for running Rhai scripts.
 
+| Tool                                                                             | Required feature(s) | Description                                         |
+| -------------------------------------------------------------------------------- | :-----------------: | --------------------------------------------------- |
+| [`rhai-run`](https://github.com/rhaiscript/rhai/blob/main/src/bin/rhai-run.rs)   |                     | runs each filename passed to it as a Rhai script    |
+| [`rhai-repl`](https://github.com/rhaiscript/rhai/blob/main/src/bin/rhai-repl.rs) |     `rustyline`     | simple REPL that interactively evaluates statements |
+| [`rhai-dbg`](https://github.com/rhaiscript/rhai/blob/main/src/bin/rhai-dbg.rs)   |     `debugging`     | the _Rhai Debugger_                                 |
+
 
 How to Run
 ----------
 
-```bash
+```sh
 cargo run --bin sample_app_to_run
 ```
+
+or with required features
+
+```sh
+cargo run --bin sample_app_to_run --features feature1,feature2,feature3
+```
+
+
+How to Install
+--------------
+
+To install these all tools (with [`decimal`] and [`metadata`] support), use the following command:
+
+```sh
+cargo install --path . --bins  --features decimal,metadata,debugging,rustyline
+```
+
+or specifically:
+
+```sh
+cargo install --path . --bin rhai-run  --features decimal,metadata,debugging,rustyline
+```

src/bin/rhai-dbg.rs

@@ -1,12 +1,6 @@
-#![cfg(not(feature = "no_std"))]
-
-#[cfg(feature = "debugging")]
+use rhai::debugger::DebuggerCommand;
 use rhai::{Dynamic, Engine, EvalAltResult, ImmutableString, Position, Scope};
 
-#[cfg(feature = "debugging")]
-use rhai::debugger::DebuggerCommand;
-
-#[cfg(feature = "debugging")]
 use std::{
     env,
     fs::File,
@@ -16,7 +10,6 @@ use std::{
 };
 
 /// Pretty-print source line.
-#[cfg(feature = "debugging")]
 fn print_source(lines: &[String], pos: Position, offset: usize) {
     let line_no = if lines.len() > 1 {
         if pos.is_none() {
@@ -44,7 +37,6 @@ fn print_source(lines: &[String], pos: Position, offset: usize) {
 }
 
 /// Pretty-print error.
-#[cfg(feature = "debugging")]
 fn print_error(input: &str, mut err: EvalAltResult) {
     let lines: Vec<_> = input.trim().split('\n').collect();
     let pos = err.take_position();
@@ -78,7 +70,6 @@ fn print_error(input: &str, mut err: EvalAltResult) {
 }
 
 /// Print debug help.
-#[cfg(feature = "debugging")]
 fn print_debug_help() {
     println!("help                  => print this help");
     println!("quit, exit, kill      => quit");
@@ -114,7 +105,6 @@ fn print_debug_help() {
 }
 
 /// Display the scope.
-#[cfg(feature = "debugging")]
 fn print_scope(scope: &Scope, dedup: bool) {
     let flattened_clone;
     let scope = if dedup {
@@ -153,7 +143,6 @@ fn print_scope(scope: &Scope, dedup: bool) {
     println!();
 }
 
-#[cfg(feature = "debugging")]
 fn main() {
     let title = format!("Rhai Debugger (version {})", env!("CARGO_PKG_VERSION"));
     println!("{}", title);
@@ -552,8 +541,3 @@ fn main() {
         }
     }
 }
-
-#[cfg(not(feature = "debugging"))]
-fn main() {
-    panic!("rhai-dbg requires the 'debugging' feature.")
-}