Add description truncation for slash commands in CLI UI

Author: sestinj

extensions/cli/.gitignore

@@ -13,4 +13,5 @@ config.yaml
 .continue-debug/
 
 *.expect
-!demo.expect
+!demo.expect
+*.cast

extensions/cli/src/ui/SlashCommandUI.tsx

@@ -4,6 +4,15 @@ import React, { useMemo } from "react";
 
 import { getAllSlashCommands } from "../commands/commands.js";
 
+const MAX_DESCRIPTION_LENGTH = 80;
+
+const truncateDescription = (description: string): string => {
+  if (description.length <= MAX_DESCRIPTION_LENGTH) {
+    return description;
+  }
+  return description.slice(0, MAX_DESCRIPTION_LENGTH).trim() + "…";
+};
+
 interface SlashCommandUIProps {
   assistant?: AssistantConfig;
   filter: string;
@@ -74,7 +83,7 @@ const SlashCommandUI: React.FC<SlashCommandUIProps> = ({
               {paddedCommandName}
               <Text color={isSelected ? "blue" : "gray"}>
                 {"    "}
-                {command.description}
+                {truncateDescription(command.description)}
               </Text>
             </Text>
           </Box>