Rework `atuin init` (#652)

* Rework `atuin init`

This allows users to disable the CTRL-R and Up Arrow bindings,
independently from one another

* Document --disable-{ctrl-r,up-arrow}

* Apply suggestions from code review

Co-authored-by: Ellie Huxtable <ellie@elliehuxtable.com>

Co-authored-by: Ellie Huxtable <ellie@elliehuxtable.com>

2 files changed, 84 insertions, 21 deletions

diff --git a/src/command/init.rs b/src/command/init.rs
index 7faff036..585a8281 100644
--- a/src/command/init.rs
+++ b/src/command/init.rs
@@ -1,7 +1,20 @@
-use clap::Parser;
+use clap::{Parser, ValueEnum};
 
 #[derive(Parser)]
-pub enum Cmd {
+pub struct Cmd {
+    shell: Shell,
+
+    /// Disable the binding of CTRL-R to atuin
+    #[clap(long)]
+    disable_ctrl_r: bool,
+
+    /// Disable the binding of the Up Arrow key to atuin
+    #[clap(long)]
+    disable_up_arrow: bool,
+}
+
+#[derive(Clone, Copy, ValueEnum)]
+pub enum Shell {
     /// Zsh setup
     Zsh,
     /// Bash setup
@@ -10,27 +23,78 @@ pub enum Cmd {
     Fish,
 }
 
-fn init_zsh() {
-    let full = include_str!("../shell/atuin.zsh");
-    println!("{full}");
-}
+impl Cmd {
+    fn init_zsh(&self) {
+        let base = include_str!("../shell/atuin.zsh");
 
-fn init_bash() {
-    let full = include_str!("../shell/atuin.bash");
-    println!("{full}");
-}
+        println!("{base}");
 
-fn init_fish() {
-    let full = include_str!("../shell/atuin.fish");
-    println!("{full}");
-}
+        if std::env::var("ATUIN_NOBIND").is_err() {
+            const BIND_CTRL_R: &str = "bindkey '^r' _atuin_search_widget";
+            const BIND_UP_ARROW: &str = "bindkey '^[[A' _atuin_up_search_widget
+bindkey '^[OA' _atuin_up_search_widget";
+            if !self.disable_ctrl_r {
+                println!("{BIND_CTRL_R}");
+            }
+            if !self.disable_up_arrow {
+                println!("{BIND_UP_ARROW}");
+            }
+        }
+    }
 
-impl Cmd {
-    pub fn run(&self) {
-        match self {
-            Self::Zsh => init_zsh(),
-            Self::Bash => init_bash(),
-            Self::Fish => init_fish(),
+    fn init_bash(&self) {
+        let base = include_str!("../shell/atuin.bash");
+        println!("{base}");
+
+        if std::env::var("ATUIN_NOBIND").is_err() {
+            const BIND_CTRL_R: &str = r#"bind -x '"\C-r": __atuin_history'"#;
+            const BIND_UP_ARROW: &str = r#"bind -x '"\e[A": __atuin_history --shell-up-key-binding'
+bind -x '"\eOA": __atuin_history --shell-up-key-binding'"#;
+            if !self.disable_ctrl_r {
+                println!("{BIND_CTRL_R}");
+            }
+            if !self.disable_up_arrow {
+                println!("{BIND_UP_ARROW}");
+            }
+        }
+    }
+
+    fn init_fish(&self) {
+        let full = include_str!("../shell/atuin.fish");
+        println!("{full}");
+
+        if std::env::var("ATUIN_NOBIND").is_err() {
+            const BIND_CTRL_R: &str = r"bind \cr _atuin_search";
+            const BIND_UP_ARROW: &str = r"bind -k up _atuin_bind_up
+bind \eOA _atuin_bind_up
+bind \e\[A _atuin_bind_up";
+            const BIND_CTRL_R_INS: &str = r"bind -M insert \cr _atuin_search";
+            const BIND_UP_ARROW_INS: &str = r"bind -M insert -k up _atuin_bind_up
+bind -M insert \eOA _atuin_bind_up
+bind -M insert \e\[A _atuin_bind_up";
+
+            if !self.disable_ctrl_r {
+                println!("{BIND_CTRL_R}");
+            }
+            if !self.disable_up_arrow {
+                println!("{BIND_UP_ARROW}");
+            }
+
+            println!("if bind -M insert > /dev/null 2>&1");
+            if !self.disable_ctrl_r {
+                println!("{BIND_CTRL_R_INS}");
+            }
+            if !self.disable_up_arrow {
+                println!("{BIND_UP_ARROW_INS}");
+            }
+            println!("end");
+        }
+    }
+    pub fn run(self) {
+        match self.shell {
+            Shell::Zsh => self.init_zsh(),
+            Shell::Bash => self.init_bash(),
+            Shell::Fish => self.init_fish(),
         }
     }
 }
diff --git a/src/command/mod.rs b/src/command/mod.rs
index 038b24c8..1411bfd2 100644
--- a/src/command/mod.rs
+++ b/src/command/mod.rs
@@ -25,7 +25,6 @@ pub enum AtuinCmd {
     Server(server::Cmd),
 
     /// Output shell setup
-    #[command(subcommand)]
     Init(init::Cmd),
 
     /// Generate a UUID