Nixvim Config

Neovim configuration with NCrunch-style continuous testing, GitHub Copilot integration, and comprehensive language support.

⚡ Key Highlights

• 🧪 NCrunch-style testing: Auto-test-on-save with real-time coverage visualization (🟢 covered, 🟠 partial, 🔴 uncovered)
• 🤖 GitHub Copilot: GPT-4o with resource-based context system (#glob:**/*.py, @copilot for tool access)
• 📋 SSH Clipboard Support: Robust OSC 52 integration for seamless copy/paste over SSH (works with Ghostty, Windows Terminal, iTerm2)
• 🌐 Multi-language: C#/.NET, Go, Python, Ruby, Rust, Java, JavaScript/TypeScript, Zig
• ⚙️ Smart formatting: EditorConfig-aware with Prettier, OmniSharp, alejandra, shfmt

🚀 Quick Start

# Try without installing
nix run github:ChrisJTaylor/nixvim-config

# Install to profile
nix profile install .

🛠️ Installation Options

# Build locally
nix build .

# Run locally
nix run .

# Or add to your flake configuration
inputs.nixvim-config.url = "github:ChrisJTaylor/nixvim-config";
home.packages = [ inputs.nixvim-config.packages.${system}.default ];

---

📖 Feature Deep Dive

🧪 Testing & Coverage Features

NCrunch-style continuous testing with:

• Automatic test execution when saving files
• Real-time coverage updates with color-coded highlights:
  • 🟢 Green: Fully covered lines
  • 🟠 Orange: Partially covered lines
  • 🔴 Red: Uncovered lines
• Interactive test panel with neotest integration where supported
• Smart test runner selection: Vitest uses vim-test (free), while Jest and other languages use neotest
• Multi-framework support per language

Supported Languages & Frameworks:

• C#: .NET Test, xUnit, NUnit, MSTest
• Go: Built-in testing framework
• Python: pytest, unittest
• Ruby: RSpec
• Rust: Cargo test
• Java: JUnit, TestNG
• JavaScript/TypeScript: Jest, Vitest

Test runner note:

• Vitest uses vim-test for nearest/file/suite/last test execution
• Jest uses neotest-jest
• Other supported languages continue to use their neotest adapters
• The <leader>t... mappings automatically choose the appropriate backend
• Zig: Built-in testing

🤖 GitHub Copilot Integration

Advanced AI Assistant with:

• GPT-4o model for enhanced understanding
• Resource-based context system: #glob:**/*.py, #buffer:active, #gitdiff:staged
• Tool access: @copilot enables AI to use search, edit, and bash commands
• Multi-language examples: Works with Python, Rust, Go, JavaScript, C#, Java, etc.
• Project-specific context via .copilot-instructions.md

📋 Clipboard & Remote Development

Seamless Remote Experience:

• SSH Support: Uses OSC 52 escape sequences to communicate directly with your local terminal clipboard.
• Platform Agnostic: Works whether you are on Linux, macOS, or Windows (via WSL2).
• Tmux Integration: Automatic configuration when running inside tmux.

🧰 Language Support & Formatting

EditorConfig-aware formatting:

• JS/TS: Prettier via none-ls (prettierd); tsserver formatting disabled
• C#: OmniSharp handles formatting and respects .editorconfig
• Shell: shfmt with defaults -i 2 -sr -bn
• Nix: alejandra formats Nix files
• Format on save: Enabled for LSP and none-ls sources

Core Features:

• Full LSP integration with lspsaga enhanced UI
• Intelligent completion with blink-cmp
• Advanced syntax highlighting with treesitter
• Neo-tree file explorer with git integration
• Telescope fuzzy finder with frecency algorithm

---

⌨️ Keybinding Reference

AI Assistant (Copilot)

Key	Action	Description
<leader>cc	:CopilotChat	Open Copilot chat
<leader>ca	:CopilotChatOpen	Open chat with project context
<leader>cR	:CopilotChatRefresh	Refresh repository context
<leader>cT	Toggle auto-trigger	Toggle auto-trigger
<leader>cs	:CopilotChatSave	Save chat history
<leader>ct	:CopilotChatTests	Generate tests
<leader>cr	:CopilotChatReview	Review code
<leader>ci	:CopilotChatContext	Show resource syntax help
<leader>cp	:CopilotChatProjectOverview	Project overview with context
<leader>cA	:CopilotChatCodeAnalysis	Analyze codebase for improvements
<leader>cH	:CopilotChatProjectHelp	Project structure help
<leader>ce	:CopilotChatExplain	Explain selected code
<leader>cf	:CopilotChatFix	Fix selected code
<leader>cd	:CopilotChatDocs	Generate documentation
<leader>co	:CopilotChatOptimize	Optimize code
<leader>cm	:CopilotChatCommit	Generate commit message
<C-Space>	Manual suggestion trigger	Trigger suggestion in insert mode

Clipboard (SSH & Local)

Key	Action	Description
<leader>y	OSC52 Copy	Copy to system clipboard (SSH supported)
<leader>p	OSC52 Paste	Paste from system clipboard (SSH supported)
<leader>yt	Test Clipboard	Test clipboard configuration
<leader>ys	Clipboard Status	Show clipboard provider status

Testing & Coverage

Key	Action	Description
<leader>ts	:SmartTestSummary	Show test panel when supported (neotest)
<leader>tr	:SmartTestSuite	Run all tests in project
<leader>tf	:SmartTestFile	Run tests in current file
<leader>tn	:SmartTestNearest	Run test under cursor
<leader>tl	:SmartTestLast	Re-run last test
<leader>tw	:SmartTestWatch	Toggle watch current file when supported
<leader>td	:SmartTestDebug	Debug nearest test when supported
<leader>to	:SmartTestOutput	Show test output
<leader>ll	:CoverageLoad	Load coverage data
<leader>ls	:CoverageShow	Show coverage highlights
<leader>lm	:CoverageSummary	Display coverage summary
<leader>lt	:CoverageToggle	Toggle coverage display
<leader>mc	Coverage toggle	Quick coverage toggle
<leader>mx	Coverage summary	Quick coverage summary

Note: for Vitest projects, vim-test handles nearest/file/suite/last execution in a sticky terminal split. neotest summary/watch/debug/output features remain available for Jest and the other configured language adapters.

File Explorer & Navigation

Key	Action	Description
<leader>ef	:Neotree filesystem reveal	Open file explorer
<leader>efl	:Neotree filesystem reveal left	File explorer (left)
<leader>efr	:Neotree filesystem reveal right	File explorer (right)
<leader>eb	:Neotree buffers reveal	Show open buffers
<leader>eg	:Neotree git_status reveal	Show git changes

LSP & Code Navigation

Key	Action	Description
K	:Lspsaga hover_doc	Show documentation
<leader>k	:Lspsaga hover_doc	Show documentation
<leader>K	:Lspsaga hover_doc ++keep	Show documentation (keep open)
<leader>a	:Lspsaga code_action	Show code actions
<leader>f	:Lspsaga finder ref	Find references
<leader>F	:Lspsaga finder def+ref+imp	Find definitions/references/implementations

Git Integration

Key	Action	Description
<leader>gg	:LazyGit	Open LazyGit

Window Management

Key	Action	Description
<leader>|	<C-w><C-v>	Split vertically
<leader>-	<C-w><C-s>	Split horizontally
<leader>w	<C-w><C-w>	Switch windows
<C-h/j/k/l>	Move focus	Navigate between windows

Utilities

Key	Action	Description
<leader>q	:q!	Quit without saving
<leader>m	:marks	List all marks
<leader>tm	:TimerlyToggle	Toggle time tracking
<leader>rr	Telescope refactoring	Show refactoring options
t	:Lspsaga term_toggle	Toggle floating terminal
<ESC>	:nohlsearch	Clear search highlights

📚 Resources

• Nixvim documentation
• NixOS
• Nix first steps