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Add Fish custom prompts #4

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2 changes: 1 addition & 1 deletion README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -37,7 +37,7 @@ Or your usual **`dfu`** alias if it wraps the same steps.

## Layout notes

- **Fish** (`dot_config/fish/`): `conf.d/` snippets (PATH from **`00-chezmoi-path.fish.tmpl`**, env, abbreviations, dircolors, Catppuccin theme, vi bindings, secrets) and **`functions/`** for `dfu`, `load_secret`, `cdgr`, `up`, helpers, plus **`fish_prompt`** / **`fish_right_prompt`** (cwd + `USER at <~/.name>` + `fish_git_prompt`). Not ported from zsh: async right-prompt, `tog` / `vshow` / `vmultiline`.
- **Fish** (`dot_config/fish/`): `conf.d/` snippets (PATH from **`00-path.fish.tmpl`**, env, abbreviations, Catppuccin theme, vi bindings, secrets) and **`functions/`** for `dfu`, `load_secret`, `mcd`, `peek`, `up`, plus **`fish_prompt`** / **`fish_right_prompt`** (cwd + `USER at <~/.name>` + `fish_git_prompt`). Not ported from zsh: async right-prompt, `tog` / `vshow` / `vmultiline`.
- **Vim externals** ([`.chezmoiexternal.toml`](.chezmoiexternal.toml)): [vim-polyglot](https://github.com/sheerun/vim-polyglot) for bundled syntax; [vim-go](https://github.com/fatih/vim-go) with **`g:polyglot_disabled = ['go']`** in `dot_vimrc` so Go stays on vim-go. Separate trees for [preservim/nerdtree](https://github.com/preservim/nerdtree), [lightline.vim](https://github.com/itchyny/lightline.vim), [material.vim](https://github.com/kaicataldo/material.vim), [incsearch.vim](https://github.com/haya14busa/incsearch.vim). Dircolors: [nordtheme/dircolors](https://github.com/nordtheme/dircolors) under `~/.shell/plugins/nord-dircolors/`.
- **`dot_zshrc.tmpl`**: main zsh init (PATH, Homebrew on macOS, shared `~/.shell` and `~/.zsh` bits). Optional **`~/.zshrc.local`** is sourced last for machine-only overrides (not in this repo).
- **`dot_hammerspoon/`** is skipped on non-macOS via **`.chezmoiignore.tmpl`**.
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7 changes: 7 additions & 0 deletions dot_config/fish/functions/_machine_name.fish
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@@ -0,0 +1,7 @@
function _machine_name
if test -f $HOME/.name
cat $HOME/.name
else
hostname -s
end
Comment on lines +2 to +6

@gemini-code-assist gemini-code-assist Bot Jul 9, 2026

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medium

Spawning external processes like cat and hostname on every prompt render introduces unnecessary latency and slows down terminal responsiveness. We can optimize this by using the built-in read command to read the file without forking, using the built-in prompt_hostname function, and caching the resolved machine name in a global variable so it is only computed once per session.

    if not set -q __machine_name_cache
        if test -f $HOME/.name
            read -l name < $HOME/.name
            set -g __machine_name_cache (string trim $name)
        else
            set -g __machine_name_cache (prompt_hostname)
        end
    end
    echo -n $__machine_name_cache

end
15 changes: 15 additions & 0 deletions dot_config/fish/functions/fish_prompt.fish
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function fish_prompt
set -l cmd_status $status

echo -n (set_color green)(prompt_pwd)(set_color normal)' '

if test $cmd_status -ne 0
echo -n (set_color red)'!'(set_color normal)' '
end

if test (id -u) -eq 0
echo -n (set_color red)'>'(set_color normal)' '
else
echo -n (set_color magenta)'>'(set_color normal)' '
end
Comment on lines +10 to +14

@gemini-code-assist gemini-code-assist Bot Jul 9, 2026

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medium

Using (id -u) spawns an external process on every single prompt render, which can degrade shell performance. Fish provides a built-in function fish_is_root_user that checks user privileges extremely quickly without spawning any external processes.

    if fish_is_root_user
        echo -n (set_color red)'>'(set_color normal)' '
    else
        echo -n (set_color magenta)'>'(set_color normal)' '
    end

end
12 changes: 12 additions & 0 deletions dot_config/fish/functions/fish_right_prompt.fish
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@@ -0,0 +1,12 @@
function fish_right_prompt
if test (id -u) -eq 0
echo -n (set_color red)(whoami)(set_color normal)
else
echo -n (set_color magenta)(whoami)(set_color normal)
end
Comment on lines +2 to +6

@gemini-code-assist gemini-code-assist Bot Jul 9, 2026

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medium

Spawning external processes like (id -u) and (whoami) on every right prompt render degrades terminal responsiveness. We can optimize this by using the built-in fish_is_root_user function and the standard $USER environment variable, avoiding external process forks entirely.

    if fish_is_root_user
        echo -n (set_color red)"$USER"(set_color normal)
    else
        echo -n (set_color magenta)"$USER"(set_color normal)
    end


echo -n (set_color blue)' at '(set_color normal)
echo -n (set_color cyan)(_machine_name)(set_color normal)' '

fish_git_prompt
end