Respect environment variable for colors

Author: m42e

Cargo.lock

@@ -73,3 +73,8 @@ pub fn get_default_tab() -> Location {
         _ => Location::Session,
     }
 }
+
+pub fn get_color() -> String {
+    let color = env::var("HISTDB_COLOR").unwrap_or(String::from("auto"));
+    return color.to_string();
+}

src/environment.rs

@@ -93,13 +93,15 @@ fn show_history(thequery: String) -> Result<String, String> {
     loop {
         let title = generate_title(&location);
         let window_option = get_preview_window_option();
+        let color_options = get_color();
 
         let options = SkimOptionsBuilder::default()
             .height(Some("100%"))
             .multi(false)
             .reverse(true)
             .prompt(Some("history >>"))
             .query(Some(&query))
+            .color(Some(&color_options))
             .bind(vec![
                 "f1:abort",
                 "f2:abort",