feat: tie dialog to graph

Signed-off-by: kjuulh <contact@kjuulh.io>

crates/hyperlog-tui/src/command_parser.rs

@@ -0,0 +1,37 @@
+use itertools::Itertools;
+
+pub enum Commands {
+    Write,
+    Quit,
+    WriteQuit,
+}
+
+impl Commands {
+    pub fn is_write(&self) -> bool {
+        matches!(self, Commands::Write | Commands::WriteQuit)
+    }
+
+    pub fn is_quit(&self) -> bool {
+        matches!(self, Commands::Quit | Commands::WriteQuit)
+    }
+}
+
+pub struct CommandParser {}
+
+impl CommandParser {
+    pub fn parse(raw_command: &str) -> Option<Commands> {
+        let prepared = raw_command.trim();
+        // TODO: respect quotes
+        let parts = prepared.split_whitespace().collect_vec();
+
+        match parts.split_first() {
+            Some((command, _)) => match *command {
+                "w" | "write" => Some(Commands::Write),
+                "q" | "quit" => Some(Commands::Quit),
+                "wq" | "write-quit" => Some(Commands::WriteQuit),
+                _ => None,
+            },
+            None => None,
+        }
+    }
+}