pass theme by reference

Cargo.toml

@@ -9,5 +9,6 @@ readme = "README.md"
 keywords = ["cli", "prompt", "console"]
 
 [dependencies]
-console = "0.15"
-termcolor = "1"
+console = "0.15.8"
+once_cell = "1.19.0"
+termcolor = "1.4.1"

README.md

@@ -165,7 +165,7 @@ let theme = Theme {
 Input::new("What's your e-mail?")
         .description("Please enter your e-mail address.")
         .placeholder("[email protected]")
-        .theme(theme.clone())
+        .theme(&theme)
         .run()
         .expect("error running input")?;
 ```

examples/themes.rs

@@ -3,22 +3,19 @@ use std::env::args;
 use demand::{Confirm, DemandOption, Input, MultiSelect, Theme};
 
 fn main() {
-    let mut theme = Theme::new();
-    match args().nth(1) {
-        Some(arg) => match arg.as_str() {
-            "base16" => theme = Theme::base16(),
-            "charm" => theme = Theme::charm(),
-            "catppuccin" => theme = Theme::catppuccin(),
-            "dracula" => theme = Theme::dracula(),
-            _ => {}
-        },
-        None => {}
-    }
+    let theme = match args().nth(1).unwrap_or_default().as_str() {
+        "base16" => Theme::base16(),
+        "charm" => Theme::charm(),
+        "catppuccin" => Theme::catppuccin(),
+        "dracula" => Theme::dracula(),
+        "" => Theme::new(),
+        theme => unimplemented!("theme {} not implemented", theme),
+    };
 
     let i = Input::new("What's your e-mail?")
         .description("Please enter your e-mail address.")
         .placeholder("[email protected]")
-        .theme(theme.clone());
+        .theme(&theme);
     i.run().expect("error running input");
 
     let ms = MultiSelect::new("Interests")
@@ -33,13 +30,13 @@ fn main() {
         .option(DemandOption::new("Technology"))
         .option(DemandOption::new("Travel"))
         .option(DemandOption::new("Sports"))
-        .theme(theme.clone());
+        .theme(&theme);
     ms.run().expect("error running multi select");
 
     let c = Confirm::new("Confirm privacy policy")
         .description("Do you accept the privacy policy?")
         .affirmative("Yes")
         .negative("No")
-        .theme(theme.clone());
+        .theme(&theme);
     c.run().expect("error running confirm");
 }

src/confirm.rs

@@ -1,11 +1,12 @@
-use crate::theme::Theme;
-
-use console::{Key, Term};
-
 use std::io;
 use std::io::Write;
+
+use console::{Key, Term};
 use termcolor::{Buffer, WriteColor};
 
+use crate::theme;
+use crate::theme::Theme;
+
 /// Select multiple options from a list
 ///
 /// # Example
@@ -18,11 +19,11 @@ use termcolor::{Buffer, WriteColor};
 /// let yes = ms.run().expect("error running confirm");
 /// println!("yes: {}", yes);
 /// ```
-pub struct Confirm {
+pub struct Confirm<'a> {
     /// The title of the selector
     pub title: String,
     /// The colors/style of the selector
-    pub theme: Theme,
+    pub theme: &'a Theme,
     /// A description to display above the selector
     pub description: String,
     /// The text to display for the affirmative option
@@ -35,13 +36,13 @@ pub struct Confirm {
     height: usize,
 }
 
-impl Confirm {
+impl<'a> Confirm<'a> {
     /// Create a new multi select with the given title
     pub fn new<S: Into<String>>(title: S) -> Self {
         Self {
             title: title.into(),
             description: String::new(),
-            theme: Theme::default(),
+            theme: &*theme::DEFAULT,
             term: Term::stderr(),
             affirmative: "Yes".to_string(),
             negative: "No".to_string(),
@@ -75,7 +76,7 @@ impl Confirm {
     }
 
     /// Set the theme of the dialog
-    pub fn theme(mut self, theme: Theme) -> Self {
+    pub fn theme(mut self, theme: &'a Theme) -> Self {
         self.theme = theme;
         self
     }

src/input.rs

@@ -6,7 +6,7 @@ use std::{
 use console::{Key, Term};
 use termcolor::{Buffer, WriteColor};
 
-use crate::Theme;
+use crate::{theme, Theme};
 
 /// Single line text input
 ///
@@ -18,7 +18,7 @@ use crate::Theme;
 ///   .description("We'll use this to personalize your experience.")
 ///   .placeholder("Enter your name");
 /// let name = input.run().expect("error running input");
-pub struct Input {
+pub struct Input<'a> {
     /// The title of the input
     pub title: String,
     /// A description to display after the title
@@ -34,14 +34,14 @@ pub struct Input {
     /// Input entered by the user
     pub input: String,
     /// Colors/style of the input
-    pub theme: Theme,
+    pub theme: &'a Theme,
 
     cursor: usize,
     height: usize,
     term: Term,
 }
 
-impl Input {
+impl<'a> Input<'a> {
     /// Creates a new input with the given title.
     pub fn new<S: Into<String>>(title: S) -> Self {
         Self {
@@ -52,7 +52,7 @@ impl Input {
             input: String::new(),
             inline: false,
             password: false,
-            theme: Theme::default(),
+            theme: &*theme::DEFAULT,
             cursor: 0,
             height: 0,
             term: Term::stderr(),
@@ -95,7 +95,7 @@ impl Input {
     }
 
     /// Sets the theme of the input
-    pub fn theme(mut self, theme: Theme) -> Self {
+    pub fn theme(mut self, theme: &'a Theme) -> Self {
         self.theme = theme;
         self
     }

src/multiselect.rs

@@ -1,12 +1,14 @@
-use crate::theme::Theme;
-use crate::DemandOption;
-use console::{Key, Term};
 use std::collections::HashSet;
 use std::fmt::Display;
 use std::io;
 use std::io::Write;
+
+use console::{Key, Term};
 use termcolor::{Buffer, WriteColor};
 
+use crate::theme::Theme;
+use crate::{theme, DemandOption};
+
 /// Select multiple options from a list
 ///
 /// # Example
@@ -27,11 +29,11 @@ use termcolor::{Buffer, WriteColor};
 ///   .option(DemandOption::new("Nutella"));///
 /// let toppings = ms.run().expect("error running multi select");
 /// ```
-pub struct MultiSelect<T: Display> {
+pub struct MultiSelect<'a, T: Display> {
     /// The title of the selector
     pub title: String,
     /// The colors/style of the selector
-    pub theme: Theme,
+    pub theme: &'a Theme,
     /// A description to display above the selector
     pub description: String,
     /// The options which can be selected
@@ -53,7 +55,7 @@ pub struct MultiSelect<T: Display> {
     capacity: usize,
 }
 
-impl<T: Display> MultiSelect<T> {
+impl<'a, T: Display> MultiSelect<'a, T> {
     /// Create a new multi select with the given title
     pub fn new<S: Into<String>>(title: S) -> Self {
         Self {
@@ -63,7 +65,7 @@ impl<T: Display> MultiSelect<T> {
             min: 0,
             max: usize::MAX,
             filterable: false,
-            theme: Theme::default(),
+            theme: &*theme::DEFAULT,
             err: None,
             cursor: 0,
             height: 0,
@@ -107,7 +109,7 @@ impl<T: Display> MultiSelect<T> {
     }
 
     /// Set the theme of the selector
-    pub fn theme(mut self, theme: Theme) -> Self {
+    pub fn theme(mut self, theme: &'a Theme) -> Self {
         self.theme = theme;
         self
     }

src/option.rs

@@ -44,4 +44,5 @@ impl<T: Display> PartialEq for DemandOption<T> {
         self.id == other.id
     }
 }
+
 impl<T: Display> Eq for DemandOption<T> {}

src/select.rs

@@ -1,12 +1,13 @@
-use crate::theme::Theme;
-use crate::DemandOption;
-use console::{Key, Term};
-
 use std::fmt::Display;
 use std::io;
 use std::io::Write;
+
+use console::{Key, Term};
 use termcolor::{Buffer, WriteColor};
 
+use crate::theme::Theme;
+use crate::{theme, DemandOption};
+
 /// Select multiple options from a list
 ///
 /// # Example
@@ -25,11 +26,11 @@ use termcolor::{Buffer, WriteColor};
 ///   .option(DemandOption::new("Nutella"));
 /// let topping = ms.run().expect("error running multi select");
 /// ```
-pub struct Select<T: Display> {
+pub struct Select<'a, T: Display> {
     /// The title of the selector
     pub title: String,
     /// The colors/style of the selector
-    pub theme: Theme,
+    pub theme: &'a Theme,
     /// A description to display above the selector
     pub description: String,
     /// The options which can be selected
@@ -46,15 +47,15 @@ pub struct Select<T: Display> {
     capacity: usize,
 }
 
-impl<T: Display> Select<T> {
+impl<'a, T: Display> Select<'a, T> {
     /// Create a new select with the given title
     pub fn new<S: Into<String>>(title: S) -> Self {
         Self {
             title: title.into(),
             description: String::new(),
             options: vec![],
             filterable: false,
-            theme: Theme::default(),
+            theme: &*theme::DEFAULT,
             cursor: 0,
             height: 0,
             term: Term::stderr(),
@@ -85,7 +86,7 @@ impl<T: Display> Select<T> {
     }
 
     /// Set the theme of the selector
-    pub fn theme(mut self, theme: Theme) -> Self {
+    pub fn theme(mut self, theme: &'a Theme) -> Self {
         self.theme = theme;
         self
     }

src/spinner.rs

@@ -7,7 +7,7 @@ use std::{
 use console::Term;
 use termcolor::{Buffer, WriteColor};
 
-use crate::Theme;
+use crate::{theme, Theme};
 
 /// Show a spinner
 ///
@@ -24,26 +24,26 @@ use crate::Theme;
 ///    })
 ///   .expect("error running spinner");
 /// ```
-pub struct Spinner {
+pub struct Spinner<'a> {
     // The title of the spinner
     pub title: String,
     // The style of the spinner
     pub style: SpinnerStyle,
     /// The colors/style of the spinner
-    pub theme: Theme,
+    pub theme: &'a Theme,
 
     term: Term,
     frame: usize,
     height: usize,
 }
 
-impl Spinner {
+impl<'a> Spinner<'a> {
     /// Create a new spinner with the given title
     pub fn new<S: Into<String>>(title: S) -> Self {
         Self {
             title: title.into(),
             style: SpinnerStyle::line(),
-            theme: Theme::default(),
+            theme: &*theme::DEFAULT,
             term: Term::stderr(),
             frame: 0,
             height: 0,
@@ -57,7 +57,7 @@ impl Spinner {
     }
 
     /// Set the theme of the dialog
-    pub fn theme(mut self, theme: Theme) -> Self {
+    pub fn theme(mut self, theme: &'a Theme) -> Self {
         self.theme = theme;
         self
     }

src/theme.rs

@@ -1,5 +1,8 @@
+use once_cell::sync::Lazy;
 use termcolor::{Color, ColorSpec};
 
+pub(crate) static DEFAULT: Lazy<Theme> = Lazy::new(Theme::default);
+
 /// Theme for styling the UI.
 ///
 /// # Example