list keybinding options (#906)

* list keybinding optins

* list keybinding options

* clippy error

6 files changed, 170 insertions, 5 deletions

diff --git a/crates/nu-command/src/default_context.rs b/crates/nu-command/src/default_context.rs
index 1a227270a..c1f4b1b74 100644
--- a/crates/nu-command/src/default_context.rs
+++ b/crates/nu-command/src/default_context.rs
@@ -188,7 +188,9 @@ pub fn create_default_context(cwd: impl AsRef<Path>) -> EngineState {
             Clear,
             Input,
             InputKeys,
+            Keybindings,
             Kill,
+            ListKeybindings,
             Sleep,
             TermSize,
         };
diff --git a/crates/nu-command/src/platform/mod.rs b/crates/nu-command/src/platform/mod.rs
index 03654af5c..5cbc35c4b 100644
--- a/crates/nu-command/src/platform/mod.rs
+++ b/crates/nu-command/src/platform/mod.rs
@@ -3,8 +3,8 @@ mod clear;
 mod dir_info;
 mod du;
 mod input;
-mod input_keys;
 mod kill;
+mod reedline_commands;
 mod sleep;
 mod term_size;
 
@@ -13,7 +13,7 @@ pub use clear::Clear;
 pub use dir_info::{DirBuilder, DirInfo, FileInfo};
 pub use du::Du;
 pub use input::Input;
-pub use input_keys::InputKeys;
 pub use kill::Kill;
+pub use reedline_commands::{InputKeys, Keybindings, ListKeybindings};
 pub use sleep::Sleep;
 pub use term_size::TermSize;
diff --git a/crates/nu-command/src/platform/reedline_commands/command.rs b/crates/nu-command/src/platform/reedline_commands/command.rs
new file mode 100644
index 000000000..be5af7844
--- /dev/null
+++ b/crates/nu-command/src/platform/reedline_commands/command.rs
@@ -0,0 +1,42 @@
+use nu_engine::get_full_help;
+use nu_protocol::{
+    ast::Call,
+    engine::{Command, EngineState, Stack},
+    Category, IntoPipelineData, PipelineData, Signature, Value,
+};
+
+#[derive(Clone)]
+pub struct Keybindings;
+
+impl Command for Keybindings {
+    fn name(&self) -> &str {
+        "keybindings"
+    }
+
+    fn signature(&self) -> Signature {
+        Signature::build(self.name()).category(Category::Platform)
+    }
+
+    fn usage(&self) -> &str {
+        "Keybindings related commands"
+    }
+
+    fn run(
+        &self,
+        engine_state: &EngineState,
+        stack: &mut Stack,
+        call: &Call,
+        _input: PipelineData,
+    ) -> Result<nu_protocol::PipelineData, nu_protocol::ShellError> {
+        Ok(Value::String {
+            val: get_full_help(
+                &Keybindings.signature(),
+                &Keybindings.examples(),
+                engine_state,
+                stack,
+            ),
+            span: call.head,
+        }
+        .into_pipeline_data())
+    }
+}
diff --git a/crates/nu-command/src/platform/input_keys.rs b/crates/nu-command/src/platform/reedline_commands/input_keys.rs
index bd50d278e..99d0116bf 100644
--- a/crates/nu-command/src/platform/input_keys.rs
+++ b/crates/nu-command/src/platform/reedline_commands/input_keys.rs
@@ -12,7 +12,7 @@ pub struct InputKeys;
 
 impl Command for InputKeys {
     fn name(&self) -> &str {
-        "input-keys"
+        "keybindings listen"
     }
 
     fn usage(&self) -> &str {
@@ -20,7 +20,7 @@ impl Command for InputKeys {
     }
 
     fn signature(&self) -> Signature {
-        Signature::build("input-keys").category(Category::Platform)
+        Signature::build(self.name()).category(Category::Platform)
     }
 
     fn run(
@@ -47,7 +47,7 @@ impl Command for InputKeys {
     fn examples(&self) -> Vec<Example> {
         vec![Example {
             description: "Type and see key event codes",
-            example: "input-keys",
+            example: "keybindings listen",
             result: None,
         }]
     }
diff --git a/crates/nu-command/src/platform/reedline_commands/list_keybindings.rs b/crates/nu-command/src/platform/reedline_commands/list_keybindings.rs
new file mode 100644
index 000000000..d1d9760b0
--- /dev/null
+++ b/crates/nu-command/src/platform/reedline_commands/list_keybindings.rs
@@ -0,0 +1,114 @@
+use nu_protocol::{
+    ast::Call,
+    engine::{Command, EngineState, Stack},
+    Category, Example, IntoPipelineData, PipelineData, Signature, Span, Value,
+};
+use reedline::{
+    get_reedline_edit_commands, get_reedline_keybinding_modifiers, get_reedline_keycodes,
+    get_reedline_prompt_edit_modes, get_reedline_reedline_events,
+};
+
+#[derive(Clone)]
+pub struct ListKeybindings;
+
+impl Command for ListKeybindings {
+    fn name(&self) -> &str {
+        "keybindings list"
+    }
+
+    fn signature(&self) -> Signature {
+        Signature::build(self.name())
+            .switch("modifiers", "list of modifiers", Some('m'))
+            .switch("keycodes", "list of keycodes", Some('k'))
+            .switch("modes", "list of edit modes", Some('o'))
+            .switch("events", "list of reedline event", Some('e'))
+            .switch("edits", "list of edit commands", Some('d'))
+            .category(Category::Platform)
+    }
+
+    fn usage(&self) -> &str {
+        "List available options that can be used to create keybindings"
+    }
+
+    fn examples(&self) -> Vec<Example> {
+        vec![
+            Example {
+                description: "Get list of key modifiers",
+                example: "keybindings list -m",
+                result: None,
+            },
+            Example {
+                description: "Get list of reedline events and edit commands",
+                example: "keybindings list -e -d",
+                result: None,
+            },
+            Example {
+                description: "Get list with all the available options",
+                example: "keybindings list",
+                result: None,
+            },
+        ]
+    }
+
+    fn run(
+        &self,
+        _engine_state: &EngineState,
+        _stack: &mut Stack,
+        call: &Call,
+        _input: PipelineData,
+    ) -> Result<nu_protocol::PipelineData, nu_protocol::ShellError> {
+        let records = if call.named.is_empty() {
+            let all_options = vec!["modifiers", "keycodes", "edits", "modes", "events"];
+            all_options
+                .iter()
+                .flat_map(|argument| get_records(argument, &call.head))
+                .collect()
+        } else {
+            call.named
+                .iter()
+                .flat_map(|(argument, _)| get_records(argument.item.as_str(), &call.head))
+                .collect()
+        };
+
+        Ok(Value::List {
+            vals: records,
+            span: call.head,
+        }
+        .into_pipeline_data())
+    }
+}
+
+fn get_records(entry_type: &str, span: &Span) -> Vec<Value> {
+    let values = match entry_type {
+        "modifiers" => get_reedline_keybinding_modifiers(),
+        "keycodes" => get_reedline_keycodes(),
+        "edits" => get_reedline_edit_commands(),
+        "modes" => get_reedline_prompt_edit_modes(),
+        "events" => get_reedline_reedline_events(),
+        _ => Vec::new(),
+    };
+
+    values
+        .iter()
+        .map(|edit| edit.split('\n'))
+        .flat_map(|edit| edit.map(|edit| convert_to_record(edit, entry_type, span)))
+        .collect()
+}
+
+fn convert_to_record(edit: &str, entry_type: &str, span: &Span) -> Value {
+    let entry_type = Value::String {
+        val: entry_type.to_string(),
+        span: *span,
+    };
+
+    let name = Value::String {
+        val: edit.to_string(),
+        span: *span,
+    };
+
+    Value::Record {
+        cols: vec!["type".to_string(), "name".to_string()],
+        vals: vec![entry_type, name],
+        span: *span,
+    }
+}
diff --git a/crates/nu-command/src/platform/reedline_commands/mod.rs b/crates/nu-command/src/platform/reedline_commands/mod.rs
new file mode 100644
index 000000000..0f3e1247b
--- /dev/null
+++ b/crates/nu-command/src/platform/reedline_commands/mod.rs
@@ -0,0 +1,7 @@
+mod command;
+mod input_keys;
+mod list_keybindings;
+
+pub use command::Keybindings;
+pub use input_keys::InputKeys;
+pub use list_keybindings::ListKeybindings;