mirror of
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feat(plan-mode): enhanced plan mode with explicit step tracking (#694)
Changes from the original: - Explicit [DONE:n] tag tracking (more accurate than auto-marking on tool_result) - Plan: header requirement - only extracts todos from 'Plan:' sections - Utils extracted to separate file for testability - Better session resume - only scans messages after plan-mode-execute marker - Context filtering - properly filters plan-mode-context custom type messages - Refactored to directory structure (index.ts + utils.ts + README.md) The original auto-completed steps on every tool_result, which was inaccurate for multi-tool steps. This version uses explicit [DONE:n] markers that the agent outputs after completing each step.
This commit is contained in:
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5 changed files with 834 additions and 548 deletions
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# Plan Mode Extension
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Read-only exploration mode for safe code analysis.
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## Features
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- **Read-only tools**: Restricts available tools to read, bash, grep, find, ls, question
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- **Bash allowlist**: Only read-only bash commands are allowed
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- **Plan extraction**: Extracts numbered steps from `Plan:` sections
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- **Progress tracking**: Widget shows completion status during execution
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- **[DONE:n] markers**: Explicit step completion tracking
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- **Session persistence**: State survives session resume
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## Commands
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- `/plan` - Toggle plan mode
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- `/todos` - Show current plan progress
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- `Shift+P` - Toggle plan mode (shortcut)
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## Usage
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1. Enable plan mode with `/plan` or `--plan` flag
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2. Ask the agent to analyze code and create a plan
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3. The agent should output a numbered plan under a `Plan:` header:
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```
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Plan:
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1. First step description
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2. Second step description
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3. Third step description
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```
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4. Choose "Execute the plan" when prompted
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5. During execution, the agent marks steps complete with `[DONE:n]` tags
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6. Progress widget shows completion status
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## How It Works
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### Plan Mode (Read-Only)
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- Only read-only tools available
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- Bash commands filtered through allowlist
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- Agent creates a plan without making changes
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### Execution Mode
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- Full tool access restored
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- Agent executes steps in order
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- `[DONE:n]` markers track completion
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- Widget shows progress
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### Command Allowlist
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Safe commands (allowed):
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- File inspection: `cat`, `head`, `tail`, `less`, `more`
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- Search: `grep`, `find`, `rg`, `fd`
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- Directory: `ls`, `pwd`, `tree`
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- Git read: `git status`, `git log`, `git diff`, `git branch`
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- Package info: `npm list`, `npm outdated`, `yarn info`
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- System info: `uname`, `whoami`, `date`, `uptime`
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Blocked commands:
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- File modification: `rm`, `mv`, `cp`, `mkdir`, `touch`
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- Git write: `git add`, `git commit`, `git push`
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- Package install: `npm install`, `yarn add`, `pip install`
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- System: `sudo`, `kill`, `reboot`
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- Editors: `vim`, `nano`, `code`
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340
packages/coding-agent/examples/extensions/plan-mode/index.ts
Normal file
340
packages/coding-agent/examples/extensions/plan-mode/index.ts
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/**
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* Plan Mode Extension
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*
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* Read-only exploration mode for safe code analysis.
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* When enabled, only read-only tools are available.
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*
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* Features:
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* - /plan command or Shift+P to toggle
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* - Bash restricted to allowlisted read-only commands
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* - Extracts numbered plan steps from "Plan:" sections
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* - [DONE:n] markers to complete steps during execution
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* - Progress tracking widget during execution
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*/
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import type { AgentMessage } from "@mariozechner/pi-agent-core";
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import type { AssistantMessage, TextContent } from "@mariozechner/pi-ai";
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import type { ExtensionAPI, ExtensionContext } from "@mariozechner/pi-coding-agent";
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import { Key } from "@mariozechner/pi-tui";
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import { extractTodoItems, isSafeCommand, markCompletedSteps, type TodoItem } from "./utils.js";
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// Tools
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const PLAN_MODE_TOOLS = ["read", "bash", "grep", "find", "ls", "questionnaire"];
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const NORMAL_MODE_TOOLS = ["read", "bash", "edit", "write"];
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// Type guard for assistant messages
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function isAssistantMessage(m: AgentMessage): m is AssistantMessage {
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return m.role === "assistant" && Array.isArray(m.content);
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}
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// Extract text content from an assistant message
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function getTextContent(message: AssistantMessage): string {
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return message.content
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.filter((block): block is TextContent => block.type === "text")
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.map((block) => block.text)
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.join("\n");
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}
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export default function planModeExtension(pi: ExtensionAPI): void {
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let planModeEnabled = false;
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let executionMode = false;
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let todoItems: TodoItem[] = [];
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pi.registerFlag("plan", {
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description: "Start in plan mode (read-only exploration)",
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type: "boolean",
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default: false,
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});
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function updateStatus(ctx: ExtensionContext): void {
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// Footer status
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if (executionMode && todoItems.length > 0) {
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const completed = todoItems.filter((t) => t.completed).length;
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ctx.ui.setStatus("plan-mode", ctx.ui.theme.fg("accent", `📋 ${completed}/${todoItems.length}`));
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} else if (planModeEnabled) {
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ctx.ui.setStatus("plan-mode", ctx.ui.theme.fg("warning", "⏸ plan"));
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} else {
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ctx.ui.setStatus("plan-mode", undefined);
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}
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// Widget showing todo list
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if (executionMode && todoItems.length > 0) {
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const lines = todoItems.map((item) => {
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if (item.completed) {
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return (
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ctx.ui.theme.fg("success", "☑ ") + ctx.ui.theme.fg("muted", ctx.ui.theme.strikethrough(item.text))
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);
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}
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return `${ctx.ui.theme.fg("muted", "☐ ")}${item.text}`;
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});
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ctx.ui.setWidget("plan-todos", lines);
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} else {
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ctx.ui.setWidget("plan-todos", undefined);
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}
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}
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function togglePlanMode(ctx: ExtensionContext): void {
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planModeEnabled = !planModeEnabled;
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executionMode = false;
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todoItems = [];
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if (planModeEnabled) {
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pi.setActiveTools(PLAN_MODE_TOOLS);
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ctx.ui.notify(`Plan mode enabled. Tools: ${PLAN_MODE_TOOLS.join(", ")}`);
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} else {
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pi.setActiveTools(NORMAL_MODE_TOOLS);
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ctx.ui.notify("Plan mode disabled. Full access restored.");
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}
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updateStatus(ctx);
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}
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function persistState(): void {
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pi.appendEntry("plan-mode", {
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enabled: planModeEnabled,
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todos: todoItems,
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executing: executionMode,
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});
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}
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pi.registerCommand("plan", {
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description: "Toggle plan mode (read-only exploration)",
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handler: async (_args, ctx) => togglePlanMode(ctx),
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});
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pi.registerCommand("todos", {
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description: "Show current plan todo list",
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handler: async (_args, ctx) => {
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if (todoItems.length === 0) {
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ctx.ui.notify("No todos. Create a plan first with /plan", "info");
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return;
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}
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const list = todoItems.map((item, i) => `${i + 1}. ${item.completed ? "✓" : "○"} ${item.text}`).join("\n");
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ctx.ui.notify(`Plan Progress:\n${list}`, "info");
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},
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});
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pi.registerShortcut(Key.shift("p"), {
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description: "Toggle plan mode",
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handler: async (ctx) => togglePlanMode(ctx),
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});
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// Block destructive bash commands in plan mode
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pi.on("tool_call", async (event) => {
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if (!planModeEnabled || event.toolName !== "bash") return;
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const command = event.input.command as string;
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if (!isSafeCommand(command)) {
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return {
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block: true,
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reason: `Plan mode: command blocked (not allowlisted). Use /plan to disable plan mode first.\nCommand: ${command}`,
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};
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}
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});
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// Filter out stale plan mode context when not in plan mode
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pi.on("context", async (event) => {
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if (planModeEnabled) return;
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return {
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messages: event.messages.filter((m) => {
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const msg = m as AgentMessage & { customType?: string };
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if (msg.customType === "plan-mode-context") return false;
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if (msg.role !== "user") return true;
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const content = msg.content;
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if (typeof content === "string") {
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return !content.includes("[PLAN MODE ACTIVE]");
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}
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if (Array.isArray(content)) {
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return !content.some(
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(c) => c.type === "text" && (c as TextContent).text?.includes("[PLAN MODE ACTIVE]"),
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);
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}
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return true;
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}),
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};
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});
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// Inject plan/execution context before agent starts
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pi.on("before_agent_start", async () => {
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if (planModeEnabled) {
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return {
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message: {
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customType: "plan-mode-context",
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content: `[PLAN MODE ACTIVE]
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You are in plan mode - a read-only exploration mode for safe code analysis.
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Restrictions:
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- You can only use: read, bash, grep, find, ls, questionnaire
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- You CANNOT use: edit, write (file modifications are disabled)
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- Bash is restricted to an allowlist of read-only commands
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Ask clarifying questions using the questionnaire tool.
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Use brave-search skill via bash for web research.
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Create a detailed numbered plan under a "Plan:" header:
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Plan:
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1. First step description
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2. Second step description
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...
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Do NOT attempt to make changes - just describe what you would do.`,
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display: false,
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},
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};
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}
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if (executionMode && todoItems.length > 0) {
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const remaining = todoItems.filter((t) => !t.completed);
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const todoList = remaining.map((t) => `${t.step}. ${t.text}`).join("\n");
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return {
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message: {
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customType: "plan-execution-context",
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content: `[EXECUTING PLAN - Full tool access enabled]
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Remaining steps:
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${todoList}
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Execute each step in order.
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After completing a step, include a [DONE:n] tag in your response.`,
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display: false,
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},
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};
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}
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});
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// Track progress after each turn
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pi.on("turn_end", async (event, ctx) => {
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if (!executionMode || todoItems.length === 0) return;
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if (!isAssistantMessage(event.message)) return;
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const text = getTextContent(event.message);
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if (markCompletedSteps(text, todoItems) > 0) {
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updateStatus(ctx);
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}
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persistState();
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});
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// Handle plan completion and plan mode UI
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pi.on("agent_end", async (event, ctx) => {
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// Check if execution is complete
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if (executionMode && todoItems.length > 0) {
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if (todoItems.every((t) => t.completed)) {
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const completedList = todoItems.map((t) => `~~${t.text}~~`).join("\n");
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pi.sendMessage(
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{ customType: "plan-complete", content: `**Plan Complete!** ✓\n\n${completedList}`, display: true },
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{ triggerTurn: false },
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);
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executionMode = false;
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todoItems = [];
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pi.setActiveTools(NORMAL_MODE_TOOLS);
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updateStatus(ctx);
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persistState(); // Save cleared state so resume doesn't restore old execution mode
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}
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return;
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}
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if (!planModeEnabled || !ctx.hasUI) return;
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// Extract todos from last assistant message
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const lastAssistant = [...event.messages].reverse().find(isAssistantMessage);
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if (lastAssistant) {
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const extracted = extractTodoItems(getTextContent(lastAssistant));
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if (extracted.length > 0) {
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todoItems = extracted;
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}
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}
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// Show plan steps and prompt for next action
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if (todoItems.length > 0) {
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const todoListText = todoItems.map((t, i) => `${i + 1}. ☐ ${t.text}`).join("\n");
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pi.sendMessage(
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{
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customType: "plan-todo-list",
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content: `**Plan Steps (${todoItems.length}):**\n\n${todoListText}`,
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display: true,
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},
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{ triggerTurn: false },
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);
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}
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const choice = await ctx.ui.select("Plan mode - what next?", [
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todoItems.length > 0 ? "Execute the plan (track progress)" : "Execute the plan",
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"Stay in plan mode",
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"Refine the plan",
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]);
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if (choice?.startsWith("Execute")) {
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planModeEnabled = false;
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executionMode = todoItems.length > 0;
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pi.setActiveTools(NORMAL_MODE_TOOLS);
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updateStatus(ctx);
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const execMessage =
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todoItems.length > 0
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? `Execute the plan. Start with: ${todoItems[0].text}`
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: "Execute the plan you just created.";
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pi.sendMessage(
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{ customType: "plan-mode-execute", content: execMessage, display: true },
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{ triggerTurn: true },
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);
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} else if (choice === "Refine the plan") {
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const refinement = await ctx.ui.editor("Refine the plan:", "");
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if (refinement?.trim()) {
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pi.sendUserMessage(refinement.trim());
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}
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}
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});
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// Restore state on session start/resume
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pi.on("session_start", async (_event, ctx) => {
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if (pi.getFlag("plan") === true) {
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planModeEnabled = true;
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}
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const entries = ctx.sessionManager.getEntries();
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// Restore persisted state
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const planModeEntry = entries
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.filter((e: { type: string; customType?: string }) => e.type === "custom" && e.customType === "plan-mode")
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.pop() as { data?: { enabled: boolean; todos?: TodoItem[]; executing?: boolean } } | undefined;
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if (planModeEntry?.data) {
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planModeEnabled = planModeEntry.data.enabled ?? planModeEnabled;
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todoItems = planModeEntry.data.todos ?? todoItems;
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executionMode = planModeEntry.data.executing ?? executionMode;
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}
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// On resume: re-scan messages to rebuild completion state
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// Only scan messages AFTER the last "plan-mode-execute" to avoid picking up [DONE:n] from previous plans
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const isResume = planModeEntry !== undefined;
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if (isResume && executionMode && todoItems.length > 0) {
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// Find the index of the last plan-mode-execute entry (marks when current execution started)
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let executeIndex = -1;
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for (let i = entries.length - 1; i >= 0; i--) {
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const entry = entries[i] as { type: string; customType?: string };
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if (entry.customType === "plan-mode-execute") {
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executeIndex = i;
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break;
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}
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}
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// Only scan messages after the execute marker
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const messages: AssistantMessage[] = [];
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for (let i = executeIndex + 1; i < entries.length; i++) {
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const entry = entries[i];
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if (entry.type === "message" && "message" in entry && isAssistantMessage(entry.message as AgentMessage)) {
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messages.push(entry.message as AssistantMessage);
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}
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}
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const allText = messages.map(getTextContent).join("\n");
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markCompletedSteps(allText, todoItems);
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}
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if (planModeEnabled) {
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pi.setActiveTools(PLAN_MODE_TOOLS);
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}
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updateStatus(ctx);
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});
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}
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168
packages/coding-agent/examples/extensions/plan-mode/utils.ts
Normal file
168
packages/coding-agent/examples/extensions/plan-mode/utils.ts
Normal file
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/**
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* Pure utility functions for plan mode.
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* Extracted for testability.
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*/
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// Destructive commands blocked in plan mode
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const DESTRUCTIVE_PATTERNS = [
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/\brm\b/i,
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/\brmdir\b/i,
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/\bmv\b/i,
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/\bcp\b/i,
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/\bmkdir\b/i,
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/\btouch\b/i,
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/\bchmod\b/i,
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/\bchown\b/i,
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/\bchgrp\b/i,
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/\bln\b/i,
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/\btee\b/i,
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/\btruncate\b/i,
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/\bdd\b/i,
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/\bshred\b/i,
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/(^|[^<])>(?!>)/,
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/>>/,
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/\bnpm\s+(install|uninstall|update|ci|link|publish)/i,
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/\byarn\s+(add|remove|install|publish)/i,
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/\bpnpm\s+(add|remove|install|publish)/i,
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/\bpip\s+(install|uninstall)/i,
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/\bapt(-get)?\s+(install|remove|purge|update|upgrade)/i,
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/\bbrew\s+(install|uninstall|upgrade)/i,
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/\bgit\s+(add|commit|push|pull|merge|rebase|reset|checkout|branch\s+-[dD]|stash|cherry-pick|revert|tag|init|clone)/i,
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/\bsudo\b/i,
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/\bsu\b/i,
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/\bkill\b/i,
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/\bpkill\b/i,
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/\bkillall\b/i,
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/\breboot\b/i,
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/\bshutdown\b/i,
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/\bsystemctl\s+(start|stop|restart|enable|disable)/i,
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/\bservice\s+\S+\s+(start|stop|restart)/i,
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/\b(vim?|nano|emacs|code|subl)\b/i,
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];
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// Safe read-only commands allowed in plan mode
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const SAFE_PATTERNS = [
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/^\s*cat\b/,
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/^\s*head\b/,
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/^\s*tail\b/,
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/^\s*less\b/,
|
||||
/^\s*more\b/,
|
||||
/^\s*grep\b/,
|
||||
/^\s*find\b/,
|
||||
/^\s*ls\b/,
|
||||
/^\s*pwd\b/,
|
||||
/^\s*echo\b/,
|
||||
/^\s*printf\b/,
|
||||
/^\s*wc\b/,
|
||||
/^\s*sort\b/,
|
||||
/^\s*uniq\b/,
|
||||
/^\s*diff\b/,
|
||||
/^\s*file\b/,
|
||||
/^\s*stat\b/,
|
||||
/^\s*du\b/,
|
||||
/^\s*df\b/,
|
||||
/^\s*tree\b/,
|
||||
/^\s*which\b/,
|
||||
/^\s*whereis\b/,
|
||||
/^\s*type\b/,
|
||||
/^\s*env\b/,
|
||||
/^\s*printenv\b/,
|
||||
/^\s*uname\b/,
|
||||
/^\s*whoami\b/,
|
||||
/^\s*id\b/,
|
||||
/^\s*date\b/,
|
||||
/^\s*cal\b/,
|
||||
/^\s*uptime\b/,
|
||||
/^\s*ps\b/,
|
||||
/^\s*top\b/,
|
||||
/^\s*htop\b/,
|
||||
/^\s*free\b/,
|
||||
/^\s*git\s+(status|log|diff|show|branch|remote|config\s+--get)/i,
|
||||
/^\s*git\s+ls-/i,
|
||||
/^\s*npm\s+(list|ls|view|info|search|outdated|audit)/i,
|
||||
/^\s*yarn\s+(list|info|why|audit)/i,
|
||||
/^\s*node\s+--version/i,
|
||||
/^\s*python\s+--version/i,
|
||||
/^\s*curl\s/i,
|
||||
/^\s*wget\s+-O\s*-/i,
|
||||
/^\s*jq\b/,
|
||||
/^\s*sed\s+-n/i,
|
||||
/^\s*awk\b/,
|
||||
/^\s*rg\b/,
|
||||
/^\s*fd\b/,
|
||||
/^\s*bat\b/,
|
||||
/^\s*exa\b/,
|
||||
];
|
||||
|
||||
export function isSafeCommand(command: string): boolean {
|
||||
const isDestructive = DESTRUCTIVE_PATTERNS.some((p) => p.test(command));
|
||||
const isSafe = SAFE_PATTERNS.some((p) => p.test(command));
|
||||
return !isDestructive && isSafe;
|
||||
}
|
||||
|
||||
export interface TodoItem {
|
||||
step: number;
|
||||
text: string;
|
||||
completed: boolean;
|
||||
}
|
||||
|
||||
export function cleanStepText(text: string): string {
|
||||
let cleaned = text
|
||||
.replace(/\*{1,2}([^*]+)\*{1,2}/g, "$1") // Remove bold/italic
|
||||
.replace(/`([^`]+)`/g, "$1") // Remove code
|
||||
.replace(
|
||||
/^(Use|Run|Execute|Create|Write|Read|Check|Verify|Update|Modify|Add|Remove|Delete|Install)\s+(the\s+)?/i,
|
||||
"",
|
||||
)
|
||||
.replace(/\s+/g, " ")
|
||||
.trim();
|
||||
|
||||
if (cleaned.length > 0) {
|
||||
cleaned = cleaned.charAt(0).toUpperCase() + cleaned.slice(1);
|
||||
}
|
||||
if (cleaned.length > 50) {
|
||||
cleaned = `${cleaned.slice(0, 47)}...`;
|
||||
}
|
||||
return cleaned;
|
||||
}
|
||||
|
||||
export function extractTodoItems(message: string): TodoItem[] {
|
||||
const items: TodoItem[] = [];
|
||||
const headerMatch = message.match(/\*{0,2}Plan:\*{0,2}\s*\n/i);
|
||||
if (!headerMatch) return items;
|
||||
|
||||
const planSection = message.slice(message.indexOf(headerMatch[0]) + headerMatch[0].length);
|
||||
const numberedPattern = /^\s*(\d+)[.)]\s+\*{0,2}([^*\n]+)/gm;
|
||||
|
||||
for (const match of planSection.matchAll(numberedPattern)) {
|
||||
const text = match[2]
|
||||
.trim()
|
||||
.replace(/\*{1,2}$/, "")
|
||||
.trim();
|
||||
if (text.length > 5 && !text.startsWith("`") && !text.startsWith("/") && !text.startsWith("-")) {
|
||||
const cleaned = cleanStepText(text);
|
||||
if (cleaned.length > 3) {
|
||||
items.push({ step: items.length + 1, text: cleaned, completed: false });
|
||||
}
|
||||
}
|
||||
}
|
||||
return items;
|
||||
}
|
||||
|
||||
export function extractDoneSteps(message: string): number[] {
|
||||
const steps: number[] = [];
|
||||
for (const match of message.matchAll(/\[DONE:(\d+)\]/gi)) {
|
||||
const step = Number(match[1]);
|
||||
if (Number.isFinite(step)) steps.push(step);
|
||||
}
|
||||
return steps;
|
||||
}
|
||||
|
||||
export function markCompletedSteps(text: string, items: TodoItem[]): number {
|
||||
const doneSteps = extractDoneSteps(text);
|
||||
for (const step of doneSteps) {
|
||||
const item = items.find((t) => t.step === step);
|
||||
if (item) item.completed = true;
|
||||
}
|
||||
return doneSteps.length;
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue