Add MongoDB Shell (mongosh) installation support

[Copilot]

Overview

This PR adds the ability to install and manage MongoDB Shell (mongosh) versions directly through the m tool, addressing issue #160. Users can now install mongosh just like they install MongoDB server and Database Tools.

Motivation

MongoDB Shell (mongosh) is released separately from the MongoDB server starting with MongoDB 6.0+. Previously, users had to manually install mongosh via package managers (e.g., brew on macOS) or download it manually. This PR brings mongosh management into the m tool, providing a consistent interface for managing all MongoDB components.

New Features

MongoDB Shell Installation Commands

# List all available mongosh versions
$ m mongosh ls

# Show installed mongosh versions
$ m mongosh
$ m mongosh installed

# Install the latest stable mongosh version
$ m mongosh stable

# Install a specific mongosh version
$ m mongosh 2.3.7

# Remove mongosh versions
$ m mongosh rm 2.3.0 2.3.5

Enhanced Shell Execution

The m shell <version> [args...] command now intelligently handles both mongosh and legacy mongo shells:

• First tries to use the installed mongosh version
• Falls back to the legacy mongo shell from the MongoDB server installation if mongosh is not installed
• Provides helpful error messages suggesting how to install mongosh

Database Tools Enhancement

Added rm support for Database Tools:

# Remove Database Tools versions
$ m tools rm 100.9.0 100.9.1

Implementation Details

The implementation follows the same patterns established for Database Tools management:

Core Functions:

• SHELL_DIR configuration variable for version storage ($M_PREFIX/m/shell/versions/)
• get_all_shell_versions() fetches available versions from mongodb-js/mongosh GitHub releases
• install_shell_bin() downloads and installs mongosh binaries from downloads.mongodb.com/compass
• install_shell() activates a specific mongosh version
• check_current_shell_version() detects the currently active version
• list_shell_versions() and display_shell_versions() provide version listings
• remove_shell_versions() removes installed mongosh versions
• handle_mongosh() dispatches mongosh subcommands

Platform Support:

• Linux (x86_64)
• macOS (x86_64 and arm64)
• Downloads .tgz for Linux, .zip for macOS (version dependent)

UX Improvements:

• When called without arguments, m mongosh shows installed versions (consistent with m and m tools)
• Consistent command structure across m, m tools, and m mongosh
• Clear error messages and installation hints

Backward Compatibility

The implementation maintains full backward compatibility:

• m shell <version> [args...] continues to work, now with intelligent mongosh/mongo fallback
• All existing aliases (s, sh, mongo) continue to work
• No breaking changes to existing workflows

Testing

Added comprehensive test coverage in test/suite.mjs:

• ✅ List available mongosh versions
• ✅ Show installed mongosh versions (plain and JSON output)
• ✅ Install specific mongosh versions
• ✅ Install latest stable mongosh
• ✅ Remove mongosh versions
• ✅ Reactivate already installed versions
• ✅ Shell execution with mongosh/mongo fallback

Documentation

Updated both inline help (m --help) and README.md with:

• Complete list of new mongosh commands
• Usage examples for all features
• Explanation of intelligent shell execution behavior
• Clear distinction between mongosh management and shell execution

Example Usage

# Install the latest stable mongosh
$ m mongosh stable
... installing binary
Downloading from https://downloads.mongodb.com/compass/mongosh-2.3.7-linux-x86_64.tgz
... Installation complete

Activating: MongoDB Server 8.0.6, MongoDB Shell 2.3.7

# List installed versions
$ m mongosh
  * 2.3.7

# Execute mongosh directly
$ m shell 2.3.7
Current Mongosh Log ID: 67416a8c9f3e8d5c4b2a1e9f
Connecting to: mongodb://127.0.0.1:27017/
...

# If mongosh not installed, falls back to legacy mongo shell
$ m shell 7.0.0
... mongosh version 7.0.0 not found, falling back to legacy mongo shell
MongoDB shell version v7.0.0
connecting to: mongodb://127.0.0.1:27017/
...

Fixes #160

Original prompt

---

This section details on the original issue you should resolve

<issue_title>can you add installing shell to the tool</issue_title>
<issue_description>I believe the tool would greatly benefit from having the ability to install a shell directly. </issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes can you add installing shell to the tool #160

---

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[aheckmann]

@copilot Review and update this PR description to accurately reflect the changes.

[Copilot]

@copilot Review and update this PR description to accurately reflect the changes.

Updated the PR description to accurately reflect the implementation. Key changes:

1. Command: Uses m mongosh (not m shell) for mongosh management
2. New feature: m mongosh rm to remove installed versions
3. Enhanced: m tools rm support added
4. Smart fallback: m shell <version> tries mongosh first, falls back to legacy mongo
5. Consistent UX: m mongosh without args shows installed versions

All documentation (README and help text) now matches the actual implementation. Commit: aa0780d

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