add version flag

Readme.org

@@ -154,7 +154,6 @@ Note: this section only tracks the state of incomplete TODO items. Having everyt
 ** DONE Beta tasks
 (See tag: v0.3.0)
 ** TODO v1.0 tasks
-- Version flag
 - islist type query
 - Can pass args to relish scripts (via interpreter)
 - Can pass args to relish scripts (via command line)

src/bin/relish.rs

@@ -38,8 +38,8 @@ use {
         path::{PathBuf, Path},
     },
     reedline::{
-        FileBackedHistory, DefaultHinter, DefaultValidator,
-        Reedline, Signal, Prompt, PromptEditMode, PromptHistorySearch,
+        FileBackedHistory, DefaultHinter, Reedline, Signal,
+        Prompt, PromptEditMode, PromptHistorySearch,
         PromptHistorySearchStatus, Completer, Suggestion, Span,
         KeyModifiers, KeyCode, ReedlineEvent, Keybindings,
         ColumnarMenu, Emacs, ReedlineMenu, Validator, ValidationResult,
@@ -282,6 +282,15 @@ fn add_menu_keybindings(keybindings: &mut Keybindings) {
 fn main() {
     const HIST_FILE: &str = "/.relish_hist";
     const CONFIG_FILE_DEFAULT: &str = "/.relishrc";
+    const VERSION: &str = env!("CARGO_PKG_VERSION");
+    if env::args().count() > 1  &&
+        env::args()
+        .collect::<Vec<_>>()
+        .contains(&"--version".to_string()) {
+            println!("Relish {}", VERSION);
+            return;
+    }
+
 
     // default config file dirs
     let home_dir = home_dir().unwrap().to_str().unwrap().to_owned();