Stale message includes bin/pks if it exists (#206)

* stale message includes bin/pks if it exists

* including dotslash installation instructions

INSTALLATION.md

@@ -18,3 +18,8 @@ You can add `path/to/packs` to your `PATH` so it's available in every terminal s
 ## Option 3 (coming soon):
 I'm looking into installing via `brew` or as a native ruby gem extension. More coming soon!
 
+## Option 4:
+- Install [dotslash](https://dotslash-cli.com/docs/installation/)
+- Download the latest packs release dotslash `pks` file. Example: https://github.com/alexevanczuk/packs/releases/download/v0.2.8/pks
+- Save the `pks` file to your ruby project's bin/ directory. You'll then have a `bin/pks` file in your project.
+- Use `bin/pks` to execute the CLI.

src/packs.rs

@@ -3,6 +3,7 @@
 pub mod cli;
 
 // Module declarations
+pub(crate) mod bin_locater;
 pub(crate) mod caching;
 pub(crate) mod checker;
 pub(crate) mod configuration;

src/packs/bin_locater.rs

@@ -0,0 +1,9 @@
+use std::path::Path;
+
+pub fn packs_bin_name() -> String {
+    if Path::new("bin/pks").exists() {
+        "bin/pks".to_string()
+    } else {
+        "packs".to_string()
+    }
+}

src/packs/checker.rs

@@ -29,6 +29,7 @@ use std::fmt::Formatter;
 use std::{collections::HashSet, path::PathBuf};
 use tracing::debug;
 
+use super::bin_locater;
 use super::reference_extractor::get_all_references;
 
 #[derive(PartialEq, Clone, Eq, Hash, Debug)]
@@ -90,7 +91,8 @@ impl CheckAllResult {
         if !self.stale_violations.is_empty() {
             writeln!(
                 f,
-                "There were stale violations found, please run `packs update`"
+                "There were stale violations found, please run `{} update`",
+                bin_locater::packs_bin_name(),
             )?;
         }