# Interactive shell environment

Everything the shell, terminal multiplexer, git and ssh do beyond their defaults,
and where each is defined. All of it is managed declaratively through
home-manager — edit the listed file and rebuild, never the generated dotfiles.

Keyboard shortcuts have their own reference: [`KEYBINDINGS.md`](./KEYBINDINGS.md).

| Area                                   | Defined in                                            |
| -------------------------------------- | ----------------------------------------------------- |
| zsh, CLI tools, tmux, ssh, auto-tmux   | [`shell.nix`](./shell.nix)                            |
| git (+ delta, commitizen)              | [`git.nix`](./git.nix)                                |
| Neovim (nixvim) + LSP                  | [`editor.nix`](./editor.nix)                          |
| Claude Code (CLAUDE.md, style, memory) | [`claude.nix`](./claude.nix)                          |
| GUI apps, GTK/Firefox theming, cursor  | [`desktop.nix`](./desktop.nix) (graphical hosts only) |

Shared by every host via [`default.nix`](./default.nix); the work box also layers
[`work.nix`](../users/emmathorpe/work.nix) on top (its own ssh config, extra
packages, and the C#/Helm language servers). The committer identity (name, email,
signing key) comes from the user registry
([`../users/registry.nix`](../users/registry.nix)), not this module.

---

## zsh

| Feature                  | Notes                                                                                                                                          |
| ------------------------ | ---------------------------------------------------------------------------------------------------------------------------------------------- |
| oh-my-zsh                | plugins `git`, `man`, `sudo` (Esc-Esc to prepend sudo), `colored-man-pages`, `extract`; theme `robbyrussell`                                   |
| Autosuggestion           | fish-style history suggestions as you type (→ to accept)                                                                                       |
| Syntax highlighting      | commands coloured by validity as you type                                                                                                      |
| Completion               | menu completion; the dump is rebuilt on every activation (see Maintenance)                                                                     |
| History                  | 100k in-memory/on-disk, deduped, space-prefixed commands ignored, timestamped, **shared live across sessions**; file stays at `~/.zsh_history` |
| Dotfiles location        | `dotDir` is `~/.config/zsh` (XDG) — `.zshrc`/`.zshenv`/`.zcompdump` live there; `~/.zshenv` only bootstraps `$ZDOTDIR`                         |
| History substring search | type a fragment, then ↑/↓ cycles matching past commands — works in foot, iTerm2 and the Linux TTY (both CSI and SS3 arrow encodings bound)     |
| Prompt                   | hostname is prefixed when over SSH                                                                                                             |

**Aliases:** `ls`/`ll`/`la`/`lt` → `eza` (icons + git), `cls` → `clear`. git aliases live in git.nix (below).

## CLI tools

| Tool                    | What it gives you                                                                                                                                                                                                                   |
| ----------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `fzf`                   | `Ctrl-R` fuzzy history, `Ctrl-T` file picker, `Alt-C` fuzzy cd (Catppuccin-themed)                                                                                                                                                  |
| `zoxide`                | `z <fragment>` jumps to frecent directories                                                                                                                                                                                         |
| `direnv` + `nix-direnv` | per-project environments auto-loaded on `cd` (cached Nix dev shells)                                                                                                                                                                |
| `eza`                   | modern `ls` (drives the ls aliases)                                                                                                                                                                                                 |
| `bat`                   | syntax-highlighting pager (Catppuccin Mocha theme); behaves like `cat` when piped; also the `MANPAGER`                                                                                                                              |
| `ripgrep` / `fd`        | fast search (`rg`) and find (`fd`); also back `fzf`                                                                                                                                                                                 |
| `jq`                    | JSON processor                                                                                                                                                                                                                      |
| `gh` / `tea`            | GitHub and Gitea (`code.emmathe.dev`) CLIs; `gh` uses SSH                                                                                                                                                                           |
| `nix-index`             | `command-not-found`: an unknown command tells you which Nix package provides it (prebuilt DB, no manual indexing)                                                                                                                   |
| `comma` (`,`)           | run an uninstalled program once: `, cowsay hi`                                                                                                                                                                                      |
| `nh`                    | nicer `nixos-rebuild`/`home-manager` with diffs; `$NH_FLAKE` set to the repo. No scheduled GC (it could reap paths a running generation still references) — collect garbage manually with `nh clean all` / `nix-collect-garbage -d` |
| `btop`                  | resource monitor, themed Catppuccin Mocha (vendored theme)                                                                                                                                                                          |
| `lazygit`               | git TUI for staging/rebasing, themed to match (`git.nix`)                                                                                                                                                                           |
| `hyperfine` / `sd`      | command-line benchmarking; saner find-and-replace than sed                                                                                                                                                                          |

**Theming:** `fzf`, `bat`, `btop`, `lazygit` and `git`'s `delta` pager are all
Catppuccin Mocha, driven from the shared `../lib/catppuccin-mocha.nix` palette / the
catppuccin upstream themes.

**Env & defaults:** `xdg.enable` on; `PAGER`/`MANPAGER` (bat) set in `default.nix`
(the editor owns `$EDITOR`/`$VISUAL`); `xdg.mimeApps` maps web→Firefox,
directories→nemo (`desktop.nix`).

## tmux

**Auto-start:** opening any interactive terminal — foot, iTerm2, the WSL shell, the
Linux console — drops you straight into a tmux session named `main` (attach if it
exists, else create). Panes run a plain non-login zsh. It deliberately does **not**
fire for SSH sessions, VS Code's integrated terminal, already-inside-tmux, or
non-interactive shells. Escape hatch: `NO_TMUX=1 <terminal>` opens a bare shell.

| Setting                          | Value                                                                                                                                      |
| -------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------ |
| Mode keys                        | vi                                                                                                                                         |
| Mouse                            | on                                                                                                                                         |
| Scrollback                       | 500000 lines                                                                                                                               |
| `escape-time`                    | 10ms (the 500ms default lagged vim's ESC)                                                                                                  |
| `focus-events`                   | on (vim autoread)                                                                                                                          |
| `base-index` / `pane-base-index` | 1                                                                                                                                          |
| Splits                           | `prefix s` vertical, `prefix v` horizontal (stock `%`/`"` unbound)                                                                         |
| Pane nav                         | `Alt`+arrows (no prefix)                                                                                                                   |
| Terminal                         | `default-terminal tmux-256color`; truecolor advertised per outer terminal (`foot*`, `xterm-256color`/iTerm2) via `terminal-features … RGB` |
| Clipboard                        | `set-clipboard on`; foot `terminal-features` advertise truecolor/sync/OSC52/title/cursor                                                   |

**Plugins:** `sensible`, `vim-tmux-navigator` (Ctrl-h/j/k/l across vim ↔ tmux),
`yank`, `extrakto` (`prefix`+`Tab`: fzf-grab paths/URLs/text from the pane into
the prompt), `catppuccin` (Mocha statusline), `resurrect` + `continuum`
(sessions auto-save and restore across reboots). The statusline draws Nerd-Font
glyphs — see Fonts.

## Fonts

**JetBrainsMono Nerd Font**, **Noto Sans** and **Noto Color Emoji** are
installed on every host (in `common-nixos.nix`, because tmux/terminals run
everywhere; the Mac installs the Nerd Font to `/Library/Fonts` via the Darwin
config). `fonts.fontconfig.defaultFonts` maps the generic families so anything
asking for `monospace` gets the Nerd Font (with emoji fallback) — this also
gives the WSL box emoji/sans coverage it otherwise lacked. foot uses the Nerd
Font as its main font automatically. iTerm2's font is a GUI setting — set it to
_JetBrainsMono Nerd Font_ (Settings → Profiles → Text → Font) so the tmux
statusline glyphs render instead of `?`.

## Editor (Neovim)

`nvim` — aliased to `vi`/`vim`, and set as `$EDITOR`/`$VISUAL` — is configured
declaratively with **nixvim**, so the same plugins and config are baked in on
every host. Migrated from plain vim; the practical gain is a real LSP stack in
place of the old (inert) ALE.

| Feature        | Notes                                                                                     |
| -------------- | ----------------------------------------------------------------------------------------- |
| Colorscheme    | Catppuccin Mocha (matches the terminal and the rest of the desktop)                       |
| File tree      | nvim-tree, toggled with `,,` (comma twice; was nerdtree)                                  |
| Fuzzy finder   | telescope (+fzf-native): `<leader>ff` files, `<leader>fg` grep, `<leader>fb` buffers      |
| Format on save | conform-nvim (nixfmt, stylua, ruff, shfmt, prettier, gofumpt; LSP fallback otherwise)     |
| Git            | fugitive (`:Git …`) + gitsigns gutter signs/blame                                         |
| Diagnostics    | inline + trouble list (`<leader>xx`)                                                      |
| Completion     | nvim-cmp (LSP/buffer/path) with luasnip snippet expansion                                 |
| Indent guides  | indent-blankline, on by default (was vim-indent-guides)                                   |
| Statusline     | lualine (Catppuccin theme)                                                                |
| Editing        | which-key hints, comment (`gc`/`gcc`), autopairs, treesitter textobjects                  |
| Pane nav       | vim-tmux-navigator — `Ctrl`+`h/j/k/l` moves across vim splits and tmux panes              |
| Syntax         | tree-sitter (nix, lua, bash, markdown, groovy, c#, python, terraform, yaml)               |
| LSP            | nvim-cmp completion + servers `nil_ls` (Nix), `lua_ls`, `pyright` (Python), `terraformls` |
| Indentation    | 2-wide hard tabs (`noexpandtab`, `tabstop`/`shiftwidth` = 2); line numbers on             |
| Filetypes      | `*Jenkinsfile` → groovy                                                                   |

Leader is `Space`. LSP keymaps (`gd`, `gr`, `K`, `<leader>rn`, `<leader>ca`) and
the file-tree toggle are listed in
[`KEYBINDINGS.md`](./KEYBINDINGS.md#neovim). Add a universal language server by
enabling it under `programs.nixvim.plugins.lsp.servers` in `editor.nix`;
host-specific ones go in that host's module — the work box (`work.nix`) adds
`omnisharp` (C#) and `helm_ls` (Helm), kept off the personal machines.

## git

Pager is **delta**. **commitizen** is installed on every host; `cz` defaults to
Conventional Commits. **lazygit** (themed) is the TUI. The commit-graph is kept
current (`gc`/`fetch.writeCommitGraph`) so `lg` stays fast.

| Aliases                  |                                                                    |
| ------------------------ | ------------------------------------------------------------------ |
| `st` `co` `sw` `br` `ci` | status / checkout / switch / branch / commit                       |
| `last` `unstage`         | last commit / unstage                                              |
| `amend` `fixup` `undo`   | amend-no-edit / `commit --fixup` / soft-reset HEAD~1 (keep staged) |
| `lg`                     | graph log, all branches                                            |
| `cz` `cc`                | `git cz <sub>` (e.g. `git cz c`) and `git cc` → commitizen prompt  |

| Behaviour      |                                                                                                                                                                                                                |
| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Pulls          | rebase, with autostash + autosquash                                                                                                                                                                            |
| Fetch          | prune deleted remote branches                                                                                                                                                                                  |
| Conflicts      | `zdiff3` (shows the common ancestor)                                                                                                                                                                           |
| Diffs          | histogram algorithm, colour-moved                                                                                                                                                                              |
| `rerere`       | remembers + replays conflict resolutions                                                                                                                                                                       |
| Commit editor  | full diff shown (`commit.verbose`)                                                                                                                                                                             |
| Misc           | branches sorted by date, `column.ui = auto`, `help.autocorrect = prompt`, `push.autoSetupRemote`                                                                                                               |
| Global ignores | `result`, `result-*`, `.direnv`, `*.swp`, `.DS_Store`                                                                                                                                                          |
| Signing        | SSH commit + tag signing (`mkDefault`, so a host without the key in its agent can disable it). Name, email and signing key all come from the per-user `identity` (the user registry, `../users/registry.nix`). |

## ssh

| Feature      | Notes                                                                                                                                                |
| ------------ | ---------------------------------------------------------------------------------------------------------------------------------------------------- |
| ssh-agent    | runs on Linux (launchd on macOS); keys added on **first use** so the passphrase is typed once per login session — this also feeds git commit signing |
| macOS        | `UseKeychain` caches the passphrase in the login keychain (guarded by `IgnoreUnknown`, so a non-Apple `ssh` skips it instead of erroring)            |
| Gitea remote | `code.emmathe.dev` → `HostName 10.187.1.76` (DNS-override), `Port 30009`, user `git`, dedicated key, `identitiesOnly`                                |
| Defaults     | the module's deprecated default block is opted out; equivalents kept under `settings."*"`                                                            |

The **work box keeps its own `~/.ssh/config`** (home-manager's `programs.ssh` is
forced off there) but still runs the agent.

## Claude Code

Managed declaratively by [`claude.nix`](./claude.nix) on every host (the CLI is
`pkgs.claude-code`, tracked to unstable via the flake overlay).

| Managed (static, from Nix)                          | Left mutable (runtime state)                           |
| --------------------------------------------------- | ------------------------------------------------------ |
| `~/.claude/CLAUDE.md` (persona + memory workflow)   | `settings.json` (permissions, model, theme, `/config`) |
| `~/.claude/output-styles/soviet-engineer.md`        | `.credentials.json`, history, caches                   |
| `~/.claude/memory/` (read-only symlink to the repo) |                                                        |

`settings.json` is intentionally **not** managed: Claude rewrites it at runtime
(interactive permission grants, `/config`), which a read-only store symlink would
break.

**Memory is sourced from this repo.** The files in
[`claude/memory/`](./claude/memory) are the source of truth; they are symlinked
read-only into `~/.claude/memory`, so recall works but the runtime "save a
memory" path does not. To add/change/remove a memory, edit `claude/memory/`
(one file per memory + the `MEMORY.md` index) and rebuild — `CLAUDE.md` tells
Claude to route new memories there.

## Maintenance behaviours

- **zcompdump reset** — `~/.config/zsh/.zcompdump*` (plus legacy `~/.zcompdump*`
  and the cache copy) is removed on every activation, so a stale
  dump (pointing at `/nix/store` paths a rebuild or a manual GC removed) can't
  break completion with `_git: function definition file not found`.
- **GC** — no scheduled timer; collect garbage deliberately (`nh clean all` /
  `nix-collect-garbage -d`) when no important session is running.

## Per-host differences

|                             | Personal Linux (sway) | macOS             | Work WSL (EDaaS)            |
| --------------------------- | --------------------- | ----------------- | --------------------------- |
| Auto-tmux                   | yes (foot/TTY)        | yes (iTerm2)      | yes (WSL shell)             |
| git email                   | `iam@emmathe.dev`     | `iam@emmathe.dev` | `…@citrix.com` (work)       |
| ssh config managed          | yes                   | yes               | no (keeps corporate config) |
| ssh-agent                   | yes                   | launchd           | yes (work module)           |
| GUI / theming (desktop.nix) | yes                   | no                | no                          |
