mnml

NvChad meets VSCode — a terminal IDE in Rust.

Vim or standard editing, first-class on both sides — without if vim {} scattered through the codebase. NvChad-style tree / tabline / statusline chrome; VSCode-style palette, mouse fluency, and modeless keymap. LSP, rich git, fuzzy everything, embedded terminal & AI panes, a baked-in HTTP client, and a headless test harness — one binary.

mnml is a terminal IDE that aims to be a real editor and a baked-in HTTP request client and a scriptable, testable surface — built so the pieces compose instead of fighting each other.

It takes NvChad's look — file-tree rail, tabline of open buffers, powerline statusline, Nerd-Font devicons, tree-sitter highlighting — and marries it to VSCode's discoverability — command palette, activity bar, right-click menus, mouse-first chrome, a modeless keymap that doesn't hide anything behind a modifier. Under both surfaces sits one design decision: a pluggable input layer. Vim modal editing and the modeless standard keymap are both first-class, both fully remappable, and swappable at runtime. The editor, buffer, and render layers never branch on which one is active.

Highlights

• Two editing modes, one codebase. A modal vim keymap (Normal / Insert / Visual / Visual-Block / Replace + a : ex-command line) and a modeless standard keymap. Swap live with :set input=vim or the command palette. Input handlers translate keys into a closed set of edit operations — the rest of the app is mode-agnostic.
• Splits, panes, tab pages. A recursive split tree; editors, terminals, diffs, and tool panes are all Panes. Vim Ctrl-W window chords and mouse drag-to-resize both work. An optional right side panel (Ctrl+Shift+B or :set rightpanel) gives a collapsible, drag-resizable column on the right edge.
• LSP, batteries included. Completion with docs, hover, go-to-definition, references, rename with preview, code actions, inlay hints, semantic tokens, document/type/call hierarchy, signature help, and a Problems pane — driven by a config-driven server table.
• Rich git + a coloured-lane commit graph. Gutter line-signs, a diff pane with per-hunk staging, blame, a staging view, a coloured-lane commit DAG, a branch/worktree/PR rail, and AI-written commit messages.
• Fuzzy everything. File finder, command palette, buffer switcher, symbol picker, and a which-key leader popup — all over one fuzzy-match core.
• Embedded terminal & AI panes. Run a shell, the claude CLI, or Codex as panes; on-selection AI actions (explain / fix / refactor / write tests) and Copilot-style inline suggestions, with a CLI or direct-API backend.
• A baked-in HTTP client. Send .http / .curl / .rest files, run request chains, generate stubs from an OpenAPI spec — an editable, form-style request pane lives right in the IDE.
• Headless & scriptable. mnml --headless renders to a virtual screen driven over a file-IPC channel; a line-based .test format runs end-to-end UI tests against the same App the terminal uses.
• 94 themes (the NvChad base46 set) and tree-sitter highlighting for 39+ languages, with language injection (highlighted fenced code blocks, embedded <script> / <style>, and more).

See FEATURES.md for the complete, organised inventory.

Install

cargo install mnml-rs        # the crate is mnml-rs; the binary it installs is `mnml`

cargo install compiles from source and needs Zig 0.16.0

• git on PATH so mnml-libghostty-vt-sys can build Ghostty's VT lib (brew install zig / scoop install zig / snap install zig --classic --edge). The build script emits a helpful message if either tool is missing.

Prefer prebuilt binaries — no toolchain needed:

• Homebrew (macOS / Linux): brew install chris-mclennan/tap/mnml
• Scoop (Windows): scoop install mnml
• Direct download: releases page

A Nerd Font is recommended for devicons and powerline glyphs. Without one, pass --ascii (or set [ui] ascii_icons = true) for a plain-text fallback.

Quick start

mnml                       # open the current directory
mnml ~/code/project        # open a specific workspace
mnml --input vim           # start in vim mode (default is standard)
mnml --ascii               # no Nerd Font? plain-text icons
mnml --startup-picker      # show a workspace chooser on launch

Once it's open:

Every key is remappable — see Configuration.

Editing: vim or standard

mnml ships two input handlers and lets you pick per-session or per-workspace:

# ~/.config/mnml/config.toml
[editor]
input_style = "vim"        # or "standard"

Switch at runtime with :set input=vim / :set input=standard, or the editor.toggle_keymap command. The vim handler covers modal editing in depth — operators and text objects, registers and macros, marks, :-commands (:%s///, ranges, :g/, :norm, …), surround, and more. The standard handler is a modeless VS Code-style keymap. Both resolve through the same config-driven keymap, so [keys.global], [keys.vim], and [keys.standard] rebind either of them.

Configuration

mnml reads TOML, merged lowest-to-highest precedence:

built-in defaults
  → ~/.config/mnml/config.toml
  → <workspace>/.mnml/config.toml
  → --config PATH

[editor]
input_style = "standard"   # "vim" | "standard"
tab_width   = 4

[ui]
theme       = "onedark"    # any of 94 themes — gruvbox, catppuccin, kanagawa, nord, …
ascii_icons = false
wrap        = false

[keys.global]
"ctrl+s" = "buffer.save"
"ctrl+p" = "picker.files"
"f5"     = "dap.run"
# "key" = "none"  unbinds

[lsp.rust]
cmd        = "rust-analyzer"
extensions = ["rs"]

# Bufferline right-cluster icons. Setting this key replaces the built-in
# Claude Code + Codex defaults. `command` is a registered command id or
# a colon-prefixed ex-cmdline string (e.g. ":term my-binary").
[[ui.launcher_icon]]
id       = "claude_code"
glyph    = "\u{F0E2D}"
fallback = "CC"
command  = "ai.claude_code"
color    = "orange"
tooltip  = "Claude Code (right dock)"

[lsp.*], [ai], [dap.*], [linters.*], [formatters.*], [tasks.*], and the SCM dashboard tables are all configurable too — see FEATURES.md for the full surface.

Themed shell prompt (optional)

mnml ships a small powerline-style prompt (themes/mnml-prompt.sh) that auto-themes against the active mnml palette. When mnml spawns a shell it installs the script to ~/.config/mnml/prompt.sh and exports $MNML_PROMPT_SCRIPT plus the palette colors. To enable it, add one line to your ~/.zshrc (or .bashrc):

[ -n "$MNML_PROMPT_SCRIPT" ] && source "$MNML_PROMPT_SCRIPT"

Outside mnml shells the env var is unset and the line is a no-op, so normal terminals are unaffected. The prompt shows cwd · git branch (± when dirty) · exit code (only non-zero) · clock · context-chip. Switching mnml themes auto-rethemes the next shell spawned. No external binary required — pure bash/zsh + ANSI.

Building from source

git clone https://github.com/chris-mclennan/mnml
cd mnml
cargo build --release        # binary at target/release/mnml

cargo test                   # unit + e2e + ipc suites
cargo clippy --all-targets   # kept warning-free
cargo fmt

Development convenience wrappers:

./run.sh [WORKSPACE]        # build + run, with a rebuild-on-exit-75 loop
./run.sh restart            # tell a running instance to rebuild + relaunch (IPC)
./run.sh stop               # send quit to the running instance
./run.sh status             # show marker (workspace, IPC dir)
./run.sh headless [WS]      # same loop but --headless
./run.sh build|release|test|check   # cargo wrappers
./run.sh watch              # cargo-watch auto-rebuild + relaunch on save
./run.sh menu               # interactive numbered picker

Optional Cargo features:

cargo build --features aws-codebuild

mnml builds on stable Rust (MSRV 1.87, edition 2024).

Family

mnml is one of a small family of terminal-native Rust tools:

mnml runs in any terminal — Apple Terminal, iTerm2, Ghostty, kitty, WezTerm, Alacritty, and others.

Contributing

Contributions are welcome — see CONTRIBUTING.md for the workflow, conventions, and architecture notes, and CLAUDE.md for the load-bearing design spine; the release history lives in CHANGELOG.md.

License

Licensed under either of

• Apache License, Version 2.0 (LICENSE-APACHE)
• MIT license (LICENSE-MIT)

at your option.

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in this crate by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.