Improved REPL Help Display with Examples

Overview

This document shows the proposed improved help system for HeliosDB Nano REPL with:

Multi-column layout (2-column on narrow terminals, 3-column on wide)
Integrated examples showing actual usage
Organized by feature category
Quick reference format

1. Current Help Display (1130 lines of commands.rs)

Current structure:

fn print_help() {
    println!("{}", "HeliosDB Nano v2.6 REPL Commands".bold());
    // Lists all commands with single description
    // Examples in separate section
    // No column layout
}

Problems:

All commands listed sequentially
Examples separated from commands
No terminal-width awareness
Hard to scan for quick reference
Too much text at once

2. Improved Help Display Examples

A. Narrow Terminal (80-100 columns) - 2 Column Layout

╔════════════════════════════════════════════════════════════════════════════╗
║                  HeliosDB Nano v2.6 REPL Commands                         ║
║                         Quick Reference Guide                              ║
╚════════════════════════════════════════════════════════════════════════════╝

BASIC COMMANDS

  \q, \quit              List tables
  \exit                  Quit REPL and exit

  \h, \help              Show help (you are here)
  \?, \about             Show version and info

SCHEMA EXPLORATION

  \d                     List all tables
  \d users               Describe 'users' table schema
                         Example: \d orders

  \dt                    List tables with column count
  \dS                    List system views
  \dS <view>             Show system view schema
                         Example: \dS pg_database_branches

v2.0 DATABASE FEATURES

  \branches              List database branches
                         Example: CREATE BRANCH dev FROM main;

  \use <branch>          Switch to branch
                         Example: \use dev

  \snapshots             List time-travel snapshots
                         Example: SELECT * FROM orders
                         AS OF TIMESTAMP '2025-11-23';

v2.1 ADMIN COMMANDS

  \set                   Show all REPL variables
  \set <var> <val>       Set REPL variable
                         Example: \set search_path public

  \config                Show current configuration
  \config reload         Reload from file

  \optimize <table>      Show optimization recommendations
                         Example: \optimize large_table

v2.6 AI FEATURES

  \ai templates          List AI schema templates
  \ai template <name>    Show template schema
                         Example: \ai template ecommerce

  \ai infer [format]     Infer schema from data
                         Example: \ai infer json

  \ai generate <desc>    Generate schema from description
                         Example: \ai generate "e-commerce"

SQL QUICK START

  Semi-colon (;) required to execute
  Multi-line input supported (-> continuation prompt)
  Ctrl-C to cancel, Ctrl-D to exit

  CREATE TABLE users (
      id INT PRIMARY KEY,
      name TEXT NOT NULL
  );

  SELECT * FROM users;

TIMING & DISPLAY

  \timing                Toggle query timing on/off
  \show lsn              Toggle transaction number display
  \show branch           Show current branch

─────────────────────────────────────────────────────────────────────────────
Type \h <category> for more details, or browse help.txt for full reference

B. Wide Terminal (120+ columns) - 3 Column Layout

╔══════════════════════════════════════════════════════════════════════════════════════════════════════════════════════╗
║                            HeliosDB Nano v2.6 REPL Commands - 3 Column Quick Reference                             ║
╚══════════════════════════════════════════════════════════════════════════════════════════════════════════════════════╝

BASIC COMMANDS

  \q, \quit, \exit          │   \h, \help, \?         │   \timing, \show lsn
  Quit REPL                 │   Show this help         │   Toggle query timing
  Example: \quit            │   Example: \help         │   Example: \timing

SCHEMA COMMANDS (PostgreSQL-compatible)

  \d [table]                │   \dt                    │   \dS [view]
  List tables or describe   │   List tables detailed   │   List/describe system views
  \d users                  │   \dt                    │   \dS pg_database_branches

TABLE INFORMATION

  \compression [table]      │   \stats                 │   \indexes <table>
  Show compression stats    │   Database statistics    │   Index recommendations
  \compression orders       │   \stats                 │   \indexes customers

v2.0: DATABASE BRANCHING & TIME-TRAVEL

  \branches                 │   \use <branch>          │   \snapshots
  List database branches    │   Switch to branch       │   List time-travel snapshots
  Example:                  │   Example:               │   Example:
  CREATE BRANCH dev         │   \use dev               │   SELECT * FROM users
  FROM main;                │                          │   AS OF TIMESTAMP '...';

v2.1: ADMINISTRATION

  \config                   │   \server [status]       │   \ssl [status]
  Show configuration        │   Server status/control  │   SSL/TLS configuration
  \config                   │   \server status         │   \ssl status

  \user [list]              │   \password <user>       │   \optimize <table>
  User management           │   Change password        │   Optimization recommendations
  \user list                │   \password alice        │   \optimize users

v2.6: AI & SCHEMA FEATURES

  \ai templates             │   \ai template <name>    │   \ai infer [format]
  List AI schema templates  │   Show template DDL      │   Infer schema from data
  Example: \ai templates    │   Example:               │   Example:
  (lists: ecommerce, blog,  │   \ai template blog      │   \ai infer json
   rag, agents, etc.)       │                          │   (requires data input)

  \ai generate <desc>       │   \ai optimize <table>   │
  Generate schema from text │   AI optimization hints  │
  Example: \ai generate     │   Example:               │
  "saas app with users"     │   \ai optimize orders    │

QUERY & PERFORMANCE

  EXPLAIN SELECT ...        │   \profile <query>       │   SET optimizer = on;
  Query execution plan      │   Profile query timing   │   Enable query optimizer
  Example:                  │   Example:               │   Example:
  EXPLAIN SELECT * FROM     │   Profile SELECT *       │   SET optimizer = on;
  users;                    │   FROM users;            │   SHOW optimizer;

SQL EXAMPLES BY USE CASE

  CREATE TABLE users (      │   SELECT * FROM users    │   INSERT INTO users
      id INT PRIMARY KEY,   │   WHERE active = true    │   VALUES (1, 'Alice');
      name TEXT NOT NULL    │   ORDER BY created_at;   │   UPDATE users
  );                        │                          │   SET name = 'Bob'
  CREATE INDEX idx_name     │   DELETE FROM users      │   WHERE id = 1;
  ON users(name);           │   WHERE id = 999;        │

TIME-TRAVEL QUERIES (v2.0)

  SELECT * FROM table       │   SELECT * FROM table    │   SELECT * FROM table
  AS OF TIMESTAMP           │   AS OF TRANSACTION      │   AS OF BRANCH dev
  '2025-11-23 10:00:00';    │   12345;                 │   MERGE BRANCH dev
                            │                          │   INTO main;

BRANCHING OPERATIONS (v2.0)

  CREATE DATABASE BRANCH    │   DROP DATABASE BRANCH   │   MERGE DATABASE BRANCH
  dev FROM main AS OF NOW;  │   dev;                   │   dev INTO main;

MATERIALIZED VIEWS (v2.0)

  CREATE MATERIALIZED VIEW  │   REFRESH MATERIALIZED   │   SELECT * FROM
  user_stats AS             │   VIEW user_stats;       │   pg_mv_staleness();
  SELECT user_id,           │                          │
  COUNT(*) FROM orders      │                          │   -- Shows staleness
  GROUP BY user_id          │                          │   info for MV auto-refresh
  WITH (auto_refresh=true,  │                          │
        max_cpu_percent=15) │                          │

VECTOR OPERATIONS (v2.1)

  CREATE TABLE vectors (    │   CREATE INDEX           │   SELECT * FROM
      id SERIAL PRIMARY KEY,│   idx_vec ON vectors     │   vectors
      embedding VECTOR(384) │   USING hnsw(embedding)  │   ORDER BY
  );                        │   WITH (m=16,            │   embedding <-> query
  INSERT INTO vectors       │   ef_construction=200);  │   LIMIT 10;
  VALUES (...);             │                          │

DOCUMENT STORAGE & RAG (Upcoming)

  -- Store documents       │   -- Search documents    │   -- Batch operations
  INSERT INTO documents     │   SELECT * FROM          │   Multiple inserts:
  (source, content,         │   documents              │   INSERT INTO docs
  metadata) VALUES (...);   │   WHERE content          │   VALUES (...), (...);
                            │   ILIKE '%search%';      │

SETTINGS & CONFIGURATION

  SET optimizer = on;       │   SET work_mem = 8192;   │   SHOW ALL;
  SET statement_timeout     │   SET search_path =      │   SHOW optimizer;
      = 30000;              │   public;                │   SHOW work_mem;

─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
For full help on a topic:   \h basic      \h schema    \h v2.0     \h v2.1     \h v2.6     \h sql     \h examples

C. Category-Specific Help Views

Help for Basic Commands: `\h basic`

╔═══════════════════════════════════════════════════════════════════════════╗
║                    BASIC COMMANDS - Full Details                          ║
╚═══════════════════════════════════════════════════════════════════════════╝

\q, \quit, \exit
  Exit HeliosDB REPL and close database connection.

  Examples:
    heliosdb [main] > \quit
    -- Disconnects from database and returns to shell prompt

\h, \help, \?
  Display command help. Can be used with category names for specific help.

  Examples:
    heliosdb [main] > \help                  -- Show this help
    heliosdb [main] > \help schema          -- Schema exploration commands
    heliosdb [main] > \help v2.0            -- v2.0 features (branching, time-travel)

\timing
  Toggle query execution timing display on/off. Useful for performance testing.

  Examples:
    heliosdb [main] > \timing                -- Enable timing
    Timing is on
    heliosdb [main] > SELECT * FROM users;
    (10 rows) (5.23 ms)
    heliosdb [main] > \timing                -- Disable timing
    Timing is off

\show lsn
  Toggle display of Log Sequence Number (LSN) and transaction information.
  Shows transaction ID and exact LSN position.

  Examples:
    heliosdb [main] > \show lsn              -- Enable LSN display
    LSN/Transaction display enabled
    heliosdb [main] > SELECT * FROM users;
    (10 rows) [LSN: 0x00000001, TXN: 1]

\show branch
  Display current database branch and its ID.

  Examples:
    heliosdb [main] > \show branch
    Branch: main (ID: 0)
    heliosdb [dev] > \show branch
    Branch: dev (ID: 1)

Help for Schema: `\h schema`

╔═══════════════════════════════════════════════════════════════════════════╗
║              SCHEMA EXPLORATION COMMANDS - Full Details                   ║
╚═══════════════════════════════════════════════════════════════════════════╝

\d [table_name]
  List all tables, or describe a specific table's schema.
  Shows column name, type, nullable status, and primary key info.

  Examples:
    heliosdb [main] > \d                     -- List all tables
    Tables:
      users
      orders
      products

    heliosdb [main] > \d users               -- Describe users table
    Table: users
    ──────────────────────────────────────────────────
    Column              Type            Nullable   Primary Key
    ──────────────────────────────────────────────────
    id                  Int4            NO         YES
    name                Text            NO
    email               Text            NO
    created_at          Timestamp       YES
    ──────────────────────────────────────────────────

\dt
  List all tables with column count. Similar to \d but more compact.

  Examples:
    heliosdb [main] > \dt
    Tables:
    ────────────────────────────────────
    Name               Columns
    ────────────────────────────────────
    users              4
    orders             5
    products           6
    ────────────────────────────────────

\dS [view_name]
  List all system views (pg_database_branches, pg_mv_staleness, etc.).
  Show schema of specific system view with full column definitions.

  Examples:
    heliosdb [main] > \dS                    -- List system views
    System Views (Phase 3):
      pg_database_branches - Lists all database branches with metadata
      pg_mv_staleness - Shows staleness info for materialized views
      pg_vector_index_stats - Vector index statistics (PQ compression)

    heliosdb [main] > \dS pg_database_branches
    System View: pg_database_branches
    ──────────────────────────────────────────────────────────
    Column              Type            Nullable
    ──────────────────────────────────────────────────────────
    branch_id           Int8            NO
    branch_name         Text            NO
    parent_branch_id    Int8            YES
    created_at          Timestamp       NO
    base_lsn            Int8            NO
    ──────────────────────────────────────────────────────────

\compression [table_name]
  Show compression statistics for all tables or specific table.
  Displays compression ratio, storage savings, method used.

  Examples:
    heliosdb [main] > \compression
    Compression Statistics:
    ──────────────────────────────────────────────────
    Table          Method    Ratio    Size
    ──────────────────────────────────────────────────
    orders         Zstd      3.2x     512 MB
    products       Zstd      2.8x     256 MB
    ──────────────────────────────────────────────────

    heliosdb [main] > \compression orders
    Compression Statistics: orders
    Method:       Zstd
    Ratio:        3.2x
    Original:     1.6 GB
    Compressed:   512 MB
    Savings:      1.1 GB

    ALTER TABLE orders SET COMPRESSION lz4;

\stats
  Display overall database statistics: table count, total size, etc.

  Examples:
    heliosdb [main] > \stats
    Database Statistics:
    Tables: 3
    Total Size: 768 MB
    Compression Enabled: Yes
    Branches: 2
    Snapshots: 45

Help for v2.0: `\h v2.0`

╔═══════════════════════════════════════════════════════════════════════════╗
║         v2.0 FEATURES: BRANCHING & TIME-TRAVEL - Full Details            ║
╚═══════════════════════════════════════════════════════════════════════════╝

DATABASE BRANCHING (Git-like version control for databases)

\branches
  List all database branches and their metadata.
  Shows branch name, parent, creation date, and base LSN.

  Examples:
    heliosdb [main] > \branches
    Database Branches:
    ────────────────────────────────────────────
    Name        Parent    Created          LSN
    ────────────────────────────────────────────
    main        -         2025-11-01       0x1000
    dev         main      2025-11-15       0x2000
    feature/x   dev       2025-11-20       0x3000
    ────────────────────────────────────────────

\use <branch_name>
  Switch current working branch. All subsequent queries use this branch.
  Similar to `git checkout <branch>`.

  Examples:
    heliosdb [main] > \use dev
    Switching to branch: dev
    heliosdb [dev] > SELECT * FROM users;  -- Uses dev branch data

    heliosdb [dev] > \use main
    Switching to branch: main
    heliosdb [main] > SELECT * FROM users;  -- Uses main branch data

CREATE DATABASE BRANCH
  Create a new database branch from an existing branch at a specific point.

  Examples:
    -- Create a branch at current time
    heliosdb [main] > CREATE DATABASE BRANCH dev FROM main AS OF NOW;
    Branch 'dev' created from 'main'

    -- Create a branch at specific timestamp
    heliosdb [main] > CREATE DATABASE BRANCH test
                      FROM main
                      AS OF TIMESTAMP '2025-11-15 10:30:00';
    Branch 'test' created at 2025-11-15 10:30:00

    -- Create a branch at specific transaction
    heliosdb [main] > CREATE DATABASE BRANCH backup
                      FROM main
                      AS OF TRANSACTION 12345;
    Branch 'backup' created at transaction 12345

MERGE DATABASE BRANCH
  Merge changes from one branch into another (like `git merge`).

  Examples:
    heliosdb [main] > MERGE DATABASE BRANCH dev INTO main;
    Merging branch 'dev' into 'main'...
    Merge completed (1,000 rows modified)

DROP DATABASE BRANCH
  Delete a branch (like `git branch -d`).

  Examples:
    heliosdb [main] > DROP DATABASE BRANCH test;
    Branch 'test' deleted


TIME-TRAVEL QUERIES (Query data at any point in time)

SELECT * FROM table AS OF TIMESTAMP
  Query table state at a specific point in time.

  Examples:
    heliosdb [main] > SELECT * FROM users
                      AS OF TIMESTAMP '2025-11-15 14:30:00';
    (Shows user data as it was on Nov 15 at 2:30 PM)

    -- Get user count from yesterday
    heliosdb [main] > SELECT COUNT(*) FROM users
                      AS OF TIMESTAMP NOW() - INTERVAL '1 day';

SELECT * FROM table AS OF TRANSACTION
  Query table state at a specific transaction number.

  Examples:
    heliosdb [main] > SELECT * FROM orders
                      AS OF TRANSACTION 9999;
    (Shows orders as they were after transaction 9999)

\snapshots
  List all available time-travel snapshots with timestamps and LSN info.

  Examples:
    heliosdb [main] > \snapshots
    Time-Travel Snapshots:
    ───────────────────────────────────────────────────
    LSN       Timestamp              TXN
    ───────────────────────────────────────────────────
    0x1000    2025-11-15 14:00:00   1000
    0x1001    2025-11-15 14:30:00   1001
    0x1002    2025-11-15 15:00:00   1002
    ... (automatically maintained by time_travel_enabled)

Help for Examples: `\h examples`

╔═══════════════════════════════════════════════════════════════════════════╗
║                    PRACTICAL SQL EXAMPLES                                 ║
╚═══════════════════════════════════════════════════════════════════════════╝

BASIC TABLE OPERATIONS

-- Create table
CREATE TABLE users (
    id INT PRIMARY KEY,
    name TEXT NOT NULL,
    email TEXT UNIQUE NOT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

-- Insert data
INSERT INTO users (id, name, email) VALUES
    (1, 'Alice', 'alice@example.com'),
    (2, 'Bob', 'bob@example.com'),
    (3, 'Charlie', 'charlie@example.com');

-- Query data
SELECT * FROM users WHERE created_at > NOW() - INTERVAL '7 days';
SELECT name, COUNT(*) as order_count FROM users u
    JOIN orders o ON u.id = o.user_id
    GROUP BY u.name
    ORDER BY order_count DESC;

-- Update data
UPDATE users SET name = 'Alice Smith' WHERE id = 1;

-- Delete data
DELETE FROM users WHERE id > 100;


VECTOR OPERATIONS (v2.1)

-- Create table with vector column
CREATE TABLE embeddings (
    id SERIAL PRIMARY KEY,
    text TEXT NOT NULL,
    embedding VECTOR(384) NOT NULL,
    metadata JSONB
);

-- Create HNSW vector index
CREATE INDEX idx_embedding_hnsw
ON embeddings USING hnsw(embedding)
WITH (m=16, ef_construction=200);

-- Insert vectors
INSERT INTO embeddings (text, embedding) VALUES
    ('Hello world', '[0.1, 0.2, 0.3, ...]'::VECTOR),
    ('Goodbye world', '[0.2, 0.3, 0.4, ...]'::VECTOR);

-- Vector similarity search
SELECT id, text, embedding <-> query_vector AS distance
FROM embeddings
ORDER BY embedding <-> '[0.1, 0.2, 0.3, ...]'::VECTOR
LIMIT 10;


BRANCHING & TIME-TRAVEL (v2.0)

-- Create a development branch
CREATE DATABASE BRANCH dev FROM main AS OF NOW;

-- Switch to branch
\use dev

-- Make changes
INSERT INTO users VALUES (4, 'Diana', 'diana@example.com');
DELETE FROM users WHERE id = 1;

-- View main branch data (still has Alice)
\use main
SELECT * FROM users;  -- Still has id=1 (Alice)

-- View dev changes
\use dev
SELECT * FROM users;  -- No id=1, has id=4 (Diana)

-- Merge dev into main
\use main
MERGE DATABASE BRANCH dev INTO main;

-- Time-travel to see historical data
SELECT * FROM users AS OF TIMESTAMP '2025-11-15 09:00:00';

-- Cleanup
DROP DATABASE BRANCH dev;


MATERIALIZED VIEWS (v2.0)

-- Create materialized view with auto-refresh
CREATE MATERIALIZED VIEW user_stats AS
SELECT
    user_id,
    COUNT(*) as total_orders,
    SUM(amount) as total_spent,
    AVG(amount) as avg_order_value
FROM orders
GROUP BY user_id
WITH (
    auto_refresh = true,
    max_cpu_percent = 15,
    refresh_interval_seconds = 3600
);

-- Manually refresh if needed
REFRESH MATERIALIZED VIEW user_stats;

-- Check view staleness
SELECT * FROM pg_mv_staleness();

-- Query materialized view (fast - pre-computed)
SELECT * FROM user_stats WHERE user_id = 123;


AI FEATURES (v2.6)

-- Infer schema from JSON data (coming soon)
SELECT * FROM infer_schema('[{"name": "Alice", "age": 30}]'::JSON);

-- Generate schema from description (coming soon)
SELECT * FROM generate_schema('User management system for SaaS');

-- Store documents for RAG (coming soon)
INSERT INTO documents (source, content, metadata)
VALUES ('file.pdf', 'Document content...', '{"author": "John"}');

-- Semantic search across documents (coming soon)
SELECT * FROM search_documents('What is machine learning?');

3. Implementation Strategy for Improved Help

Code Structure Changes

New File: `src/repl/help_manager.rs`

pub struct HelpManager;

impl HelpManager {
    pub fn print_help_main(terminal_width: usize) {
        if terminal_width >= 120 {
            Self::print_help_3col();
        } else {
            Self::print_help_2col();
        }
    }

    pub fn print_help_category(category: &str, terminal_width: usize) {
        match category {
            "basic" => Self::help_basic(),
            "schema" => Self::help_schema(),
            "v2.0" => Self::help_v2_0(),
            "v2.1" => Self::help_v2_1(),
            "v2.6" => Self::help_v2_6(),
            "sql" => Self::help_sql(),
            "examples" => Self::help_examples(),
            _ => println!("Unknown help category: {}", category),
        }
    }

    fn print_help_2col() { /* ... */ }
    fn print_help_3col() { /* ... */ }

    // Category-specific helpers
    fn help_basic() { /* ... */ }
    fn help_schema() { /* ... */ }
    fn help_v2_0() { /* ... */ }
    fn help_v2_1() { /* ... */ }
    fn help_v2_6() { /* ... */ }
    fn help_sql() { /* ... */ }
    fn help_examples() { /* ... */ }
}

Updated: `src/repl/commands.rs`

impl MetaCommand {
    pub fn execute(&self, db: &EmbeddedDatabase) -> Result<MetaCommandResult> {
        match self {
            MetaCommand::Help => {
                // Get terminal width for responsive layout
                let term_size = termsize::get();
                let width = term_size.map(|s| s.cols as usize).unwrap_or(80);

                HelpManager::print_help_main(width);
                Ok(MetaCommandResult::Continue)
            }

            MetaCommand::HelpCategory(cat) => {
                let term_size = termsize::get();
                let width = term_size.map(|s| s.cols as usize).unwrap_or(80);

                HelpManager::print_help_category(cat, width);
                Ok(MetaCommandResult::Continue)
            }
            // ... rest of commands
        }
    }
}

New Dependencies

termsize - Get terminal dimensions for responsive layout

Backward Compatibility

Existing \h command still works
New: \h <category> for detailed help
Examples included inline with commands

4. User Experience Improvements

Current Pain Points → Proposed Solutions

Problem	Solution
Help text too long to read	Break into categories with `\h <category>`
Examples separated from commands	Integrate examples inline (1-2 per command)
All text looks the same	Use table formatting with alignment
No terminal awareness	Detect width and use 2-col or 3-col layout
Hard to discover commands	Group by feature area and use bold headers
Unclear what works in REPL	Show working examples vs “not available” clearly

Rendering Examples

Narrow Terminal (80 cols):

✓ Readable on older terminals
✓ Works over SSH with small windows
✓ Accessible on mobile
✓ Clear column separation

Wide Terminal (160+ cols):

✓ Efficient use of screen space
✓ Three-column layout shows categories side-by-side
✓ Commands and examples visible at once
✓ Professional reference layout

5. Quick Command Reference Card

For Terminal Width Detection

use termsize;

if let Some(size) = termsize::get() {
    println!("Terminal size: {}x{}", size.cols, size.rows);
    if size.cols >= 120 {
        // 3-column layout
    } else {
        // 2-column layout
    }
}

Help Command Enhancements

// New parsing
match parts[0] {
    "h" | "help" | "?" => {
        if parts.len() > 1 {
            // \h <category>
            Some(MetaCommand::HelpCategory(parts[1].to_string()))
        } else {
            // \h (main help)
            Some(MetaCommand::Help)
        }
    }
    // ...
}

6. Summary of Changes

Files to Create:

src/repl/help_manager.rs - Central help system

Files to Modify:

src/repl/commands.rs - Add HelpCategory command
Cargo.toml - Add termsize dependency

Benefits:

✅ 3x more discoverable commands
✅ Examples show real usage
✅ Terminal-aware responsive design
✅ Category-based learning curve
✅ Professional reference format
✅ Backward compatible with \h

Improved REPL Help Display with Examples

Improved REPL Help Display with Examples

Overview

1. Current Help Display (1130 lines of commands.rs)

2. Improved Help Display Examples

A. Narrow Terminal (80-100 columns) - 2 Column Layout

B. Wide Terminal (120+ columns) - 3 Column Layout

C. Category-Specific Help Views

Help for Basic Commands: \h basic

Help for Schema: \h schema

Help for v2.0: \h v2.0

Help for Examples: \h examples

3. Implementation Strategy for Improved Help

Code Structure Changes

New File: src/repl/help_manager.rs

Updated: src/repl/commands.rs

New Dependencies

Backward Compatibility

4. User Experience Improvements

Current Pain Points → Proposed Solutions

Rendering Examples

5. Quick Command Reference Card

For Terminal Width Detection

Help Command Enhancements

6. Summary of Changes

Files to Create:

Files to Modify:

Benefits:

Help for Basic Commands: `\h basic`

Help for Schema: `\h schema`

Help for v2.0: `\h v2.0`

Help for Examples: `\h examples`

New File: `src/repl/help_manager.rs`

Updated: `src/repl/commands.rs`