Feat: Add bang syntax in chat, remove context modifiers, and add help command

Author: chaynabors

crates/q_cli/src/cli/chat/command.rs

@@ -0,0 +1,34 @@
+use eyre::Result;
+
+pub enum Command {
+    Ask { prompt: String },
+    Execute { command: String },
+    Clear,
+    Help,
+    Quit,
+}
+
+impl Command {
+    pub fn parse(input: &str) -> Result<Self, String> {
+        let input = input.trim();
+
+        if let Some(command) = input.strip_prefix("/") {
+            return Ok(match command.to_lowercase().as_str() {
+                "clear" => Self::Clear,
+                "help" => Self::Help,
+                "q" | "exit" | "quit" => Self::Quit,
+                _ => return Err(format!("Unknown command: {}", input)),
+            });
+        }
+
+        if let Some(command) = input.strip_prefix("!") {
+            return Ok(Self::Execute {
+                command: command.to_string(),
+            });
+        }
+
+        Ok(Self::Ask {
+            prompt: input.to_string(),
+        })
+    }
+}