Working on UI

Cargo.toml

@@ -7,3 +7,4 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+dialoguer = "0.7.1"

src/lib.rs

@@ -4,6 +4,8 @@ use std::fs::{metadata, symlink_metadata};
 use std::path::PathBuf;
 use std::process::Command;
 
+use dialoguer::{theme::SimpleTheme, Confirm, MultiSelect};
+
 macro_rules! unwrap_or_false {
     ($expr: expr) => {
         match $expr {
@@ -171,22 +173,41 @@ impl Component {
             Component::Git => &[Component::Sudo],
             Component::Zsh => &[Component::Sudo],
             Component::Dotfiles => &[Component::Git],
-            Component::Zshrc => &[Component::Zsh, Component::Dotfiles],
+            Component::Zshrc => &[Component::Zsh, Component::Dotfiles, Component::OhMyZsh],
             Component::OhMyZsh => &[Component::Git],
         }
     }
+
+    /// Returns the str representation of the command.
+    pub fn to_str(self) -> &'static str {
+        match self {
+            Component::Sudo => "sudo",
+            Component::Git => "git",
+            Component::Zsh => "zsh",
+            Component::Dotfiles => "dotfiles",
+            Component::Zshrc => "zshrc",
+            Component::OhMyZsh => "ohmyzsh",
+        }
+    }
 }
 
 impl fmt::Display for Component {
     fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
-        match self {
-            Component::Sudo => write!(fmt, "sudo"),
-            Component::Git => write!(fmt, "git"),
-            Component::Zsh => write!(fmt, "zsh"),
-            Component::Dotfiles => write!(fmt, "dotfiles"),
-            Component::Zshrc => write!(fmt, "zshrc"),
-            Component::OhMyZsh => write!(fmt, "ohmyzsh"),
-        }
+        write!(
+            fmt,
+            "{} (requires {}{})",
+            self.to_str(),
+            self.dependencies()
+                .into_iter()
+                .map(|x| x.to_str())
+                .collect::<Vec<_>>()
+                .join(", "),
+            if self.is_installed() {
+                ", already installed"
+            } else {
+                ""
+            }
+        )
     }
 }
 
@@ -194,23 +215,52 @@ impl fmt::Display for Component {
 pub struct Installer {
     /// All the components to install, and whether the users want to install them.
     components: Vec<(Component, bool)>,
-
-    /// Where the users cursor is.
-    cursor: usize,
 }
 
 impl Installer {
     /// Creates a new installer.
     pub fn new() -> Installer {
         Installer {
-            components: Component::all().into_iter().map(|x| (x, true)).collect(),
-            cursor: 0,
+            components: Component::all().into_iter().map(|x| (x, false)).collect(),
         }
     }
 
-    /// Prints the installer.
-    pub fn print(&self) {
-        print!("{}", self);
+    /// Asks interactively to the user which components to install.
+    pub fn interact(&mut self) -> bool {
+        let multiselected = self
+            .components
+            .iter()
+            .map(|(component, _)| format!("{}", component))
+            .collect::<Vec<_>>();
+
+        let defaults = self
+            .components
+            .iter()
+            .map(|(_, active)| *active)
+            .collect::<Vec<_>>();
+
+        let selections = MultiSelect::with_theme(&SimpleTheme)
+            .items(&multiselected[..])
+            .defaults(&defaults[..])
+            .interact()
+            .unwrap();
+
+        for i in selections {
+            self.components[i].1 = true;
+        }
+
+        println!("The following components will be installed:");
+        for (comp, to_install) in &self.components {
+            if *to_install {
+                println!("  - {}", comp.to_str());
+            }
+        }
+        let message = "Is this correct?";
+
+        Confirm::with_theme(&SimpleTheme)
+            .with_prompt(message)
+            .interact()
+            .unwrap()
     }
 
     /// Runs the installer.
@@ -228,7 +278,8 @@ impl Installer {
         if component.is_installed() || component == Component::Sudo {
             return Ok(());
         }
-        println!("Install {}", component);
+
+        println!("Install {}", component.to_str());
 
         for dep in component.dependencies() {
             self.install_component(*dep)?;
@@ -241,32 +292,6 @@ impl Installer {
     }
 }
 
-impl fmt::Display for Installer {
-    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
-        for (index, (component, to_install)) in self.components.iter().enumerate() {
-            writeln!(
-                fmt,
-                "{} [{}] {} (requires {}{})",
-                if self.cursor == index { ">" } else { " " },
-                if *to_install { "x" } else { " " },
-                component,
-                component
-                    .dependencies()
-                    .into_iter()
-                    .map(|x| format!("{}", x))
-                    .collect::<Vec<_>>()
-                    .join(", "),
-                if component.is_installed() {
-                    ", already installed"
-                } else {
-                    ""
-                }
-            )?;
-        }
-        Ok(())
-    }
-}
-
 /// The error type of this library.
 pub enum Error {}
 
@@ -281,8 +306,9 @@ pub type Result<T> = std::result::Result<T, Error>;
 
 /// Runs the installer
 pub fn main() -> Result<()> {
-    let installer = Installer::new();
-    installer.print();
-    installer.start()?;
+    let mut installer = Installer::new();
+    if installer.interact() {
+        installer.start()?;
+    }
     Ok(())
 }