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fish-config/docs/html/11-7-customization.html
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<title>7. CUSTOMIZATION</title>
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<h1 data-number="11" id="7-customization">7. CUSTOMIZATION</h1>
<h2 data-number="11.1" id="machine-local-configuration">Machine-local
Configuration</h2>
<p>Place machine-specific settings that should not be committed to git
in:</p>
<pre><code>~/.config/.user-dots/fish/local.fish</code></pre>
<p>Typical uses: additional PATH entries, local aliases,
hostname-specific env vars, work-specific tool configs.</p>
<h2 data-number="11.2" id="secrets-and-api-keys">Secrets and API
Keys</h2>
<pre><code>~/.config/.user-dots/fish/secrets.fish</code></pre>
<p>Store API tokens, GPG keys, private credentials here. This file is
never committed.</p>
<p>Both files are sourced at the end of config.fish on every interactive
session, so they can override anything set earlier.</p>
<h2 data-number="11.3"
id="overriding-configuration-variables">Overriding Configuration
Variables</h2>
<p>Any variable set in local.fish after the main config loads takes
effect. Example: to increase the scrollback history limit:</p>
<pre><code># in local.fish
set -gx SCROLLBACK_HISTORY_MAX_FILES 200</code></pre>
<h2 data-number="11.4" id="fish-universal-variables">Fish Universal
Variables</h2>
<p>Some settings (fzf colors, theme) are stored in fish_variables via
<code>set -U</code>. These are machine-local and git-ignored. Do not
commit fish_variables.</p>
<h2 data-number="11.5"
id="opinionated-components-minimal-mode">Opinionated Components (Minimal
Mode)</h2>
<p>Every opinionated piece of this config is active by default but can
be switched off through six category opt-out variables, each evaluated
via __fish_variable_check. Set a variable to any falsy value (0, false,
no, off, n) to disable its category; erase it or set a truthy value (1,
true, yes, on, y) to re-enable. Unset means enabled.</p>
<p>An explicit per-category truthy value takes precedence over the
master switch: setting __fish_config_opinionated=0 disables all unset
categories, but a category with an explicit truthy value remains enabled
regardless.</p>
<pre><code>Variable Disables
------------------------------ ------------------------------------
__fish_config_op_aliases Command shadows and flag injection:
ls-&gt;eza, cat-&gt;bat, cd-&gt;zoxide,
rm-&gt;trash, less-&gt;ov, top-&gt;btop,
ping-&gt;prettyping, ssh-&gt;kitten,
du-&gt;duf/dust, mkdir/bash wrappers,
history timestamps, grep/cp/mv/wget
flag injection, help intercept
__fish_config_op_autoexec Startup side-effects: Fisher
bootstrap, theme apply, paru/yay
wrapper generation, auto venv
activation, WakaTime hook
__fish_config_op_overrides Key and env overrides: Vi mode,
exit-&gt;smart_exit, PAGER/MANPAGER,
CDPATH, bang-bang system, autopair,
puffer, starship prompt, theme
colors, FZF_DEFAULT_OPTS, right
prompt
__fish_config_op_integrations Terminal/tool coupling: Kitty/
WezTerm window abbreviations, done
notifications, spwin/tab/split,
hist, logs, upgrade, WakaTime
__fish_config_op_logging Logging &amp; capture: scrollback
capture on exit, paru/yay AUR log
wrappers, Kitty watcher capture;
sentinel file coordinates
cross-process state
__fish_config_op_greeting Greeting &amp; first-run UI: per-session
fish_greeting override (defines empty
function late in config.fish to
suppress distro greetings such as
CachyOS fastfetch); first-run welcome
banner in conf.d/first_run.fish</code></pre>
<p>Examples:</p>
<pre><code># Disable command shadows only (rm becomes plain rm again):
set -U __fish_config_op_aliases off
# Full minimal mode — disable all six categories at once:
set -U __fish_config_opinionated 0
# Re-enable everything:
set -Ue __fish_config_opinionated
# Minimal mode but keep the greeting:
set -U __fish_config_opinionated 0
set -U __fish_config_op_greeting 1
# (erase both to go back to full-flavor defaults)</code></pre>
<p>Notes:</p>
<ul>
<li>Command shadows (rm, cat, ls, ...) react immediately; conf.d-level
components (bindings, prompt, abbreviations, hooks) take effect in new
shells.</li>
<li>With aliases disabled, rm falls back to bare <code>command rm</code>
— files are deleted permanently, not trashed.</li>
<li>Disabled integration commands (spwin, tab, split, hist, logs,
upgrade) print an error naming the variable that disabled them.</li>
<li>On CachyOS, the distro fish config's own aliases, history override,
and bang-bang bindings are stripped per category as well.</li>
</ul>
<h3 data-number="11.5.1" id="component-reference">Component
Reference</h3>
<p>The following tables detail every component in each category. Use
this reference to understand exactly which behaviors change when you
toggle a category variable.</p>
<h4 data-number="11.5.1.1" id="c1--command-shadows">C1 — Command
Shadows</h4>
<p>Disabling __fish_config_op_aliases restores standard system behavior
for all of these commands.</p>
<pre><code>Command / Alias Active behavior Disabled fallback
───────────────────────────────────────────────────────────────────────────
ls eza -l -a --icons --hyperlink system ls
cat bat syntax-highlighted; dirs → ls /usr/bin/cat
cd zoxide frecency-based navigation fish builtin cd
rm moves files to trash (recoverable) command rm (permanent)
less $PAGER → ov → less → more → cat system less
du duf (disk overview) or dust (dir tree) system du
top btop resource monitor system top
ping prettyping --nolegend animation system ping
ssh kitten ssh in Kitty terminal system ssh
rg rg --hyperlink-format=kitty system rg
mkdir verbose path-tree display on creation mkdir -p silently
bash XDG bashrc + $SHELL reset on exit system bash
history timestamps prepended to every entry fish builtin history
cp / mv forced -i confirmation prompt cp / mv unmodified
wget forced --continue (resume downloads) system wget
grep/fgrep/egrep forced --color=auto system grep variants
dir / vdir forced --color=auto system dir / vdir
help config intercepts &quot;help config&quot; → config-help fish builtin help</code></pre>
<p>When C1 is disabled, <code>rm</code> uses bare
<code>command rm</code> with no wrapper — files are permanently deleted,
not trashed. There is no intermediate safety net.</p>
<h4 data-number="11.5.1.2" id="c2--startup-side-effects">C2 — Startup
Side-Effects</h4>
<p>These run automatically without any user action. Disabling
__fish_config_op_autoexec prevents all of them.</p>
<pre><code>Component Trigger What it does
───────────────────────────────────────────────────────────────────────────
Fisher bootstrap First shell only Downloads and installs fisher
Fisher update After bootstrap Installs all fish_plugins entries
Catppuccin Mocha theme First shell only Applies theme via fish_config
paru wrapper Every startup Writes ~/.local/bin/paru wrapper
yay wrapper Every startup Writes ~/.local/bin/yay wrapper
Python venv activation On every cd Sources .venv/bin/activate.fish
WakaTime command hook On every command Reports to WakaTime API</code></pre>
<p>When C2 is disabled: no Fisher install, no theme application, no
paru/yay wrapper generation, no automatic venv activation, and no
WakaTime reporting. The first-run completion marker
(__fish_config_first_run_complete) is still set so the init does not
re-run on subsequent shells.</p>
<p>Python venv activation fires on every directory change. If a
directory uses direnv (.envrc present), direnv takes priority and
auto-venv is skipped for that directory.</p>
<h4 data-number="11.5.1.3" id="c3--key-and-environment-overrides">C3 —
Key and Environment Overrides</h4>
<p>These change fundamental shell behavior: how keys work, which pager
opens, and what the prompt looks like. Disabling
__fish_config_op_overrides removes all of them.</p>
<pre><code>Override What it replaces or sets
───────────────────────────────────────────────────────────────────────────
Vi mode fish_vi_key_bindings replaces default Emacs mode
exit → smart_exit exit wrapper that captures scrollback before closing
PAGER=ov ov used by git, man, and all $PAGER-aware tools
MANPAGER=bat pipeline man pages rendered with syntax highlighting
CDPATH=. ~/projects ~ bare dir names resolve against ~/projects and ~
Bang-bang system ! and $ keys expand history; !^, !*, !-N, !?str?,
^old^new abbreviations; six expand_bang_* helpers
Autopair ( [ { &quot; &#39; auto-close to (), [], {}, &quot;&quot;, &#39;&#39;
Puffer key intercepts . ! $ * keys intercepted for smart expansion
Starship prompt fish_prompt replaced by Starship + OSC 133 markers
Catppuccin colors 30+ fish_color_* variables set to Mocha palette
FZF_DEFAULT_OPTS FZF themed to Catppuccin Mocha colors
Right prompt fish_right_prompt: Docker context + timestamp</code></pre>
<p>The bang-bang system spans key_bindings.fish, abbr.fish, puffer.fish,
and six expand_bang_*.fish functions. All are gated together — disabling
C3 removes the entire bang-expansion system at once.</p>
<p>When C3 is disabled, <code>exit</code> falls back to
<code>builtin exit</code> with no scrollback capture, no Kitty IPC, and
no file I/O on exit. The scrollback capture block is independently
controlled by C5 (see below).</p>
<h4 data-number="11.5.1.4" id="c4--terminal-and-tool-integration">C4 —
Terminal and Tool Integration</h4>
<p>These features couple the shell to specific external tools. Disabling
__fish_config_op_integrations disables all of them.</p>
<pre><code>Component Requires
───────────────────────────────────────────────────────────────────────────
~60 Kitty/WezTerm abbrs Active Kitty or WezTerm session
(:w, :wv, :wh, :t, etc.)
Done desktop notifications Graphical desktop with a notification daemon
spwin Kitty or WezTerm
tab Kitty, WezTerm, or Konsole
split Kitty or WezTerm
hist fzf + wl-copy (Wayland clipboard)
logs fzf + ov; reads from ~/.terminal_history/
upgrade paru or yay (Arch Linux only)
WakaTime hook wakatime CLI and a configured API key</code></pre>
<p>Disabled integration commands (spwin, tab, split, hist, logs,
upgrade) print a colored error to stderr naming the variable that
disabled them rather than silently failing.</p>
<h4 data-number="11.5.1.5" id="c5--logging-and-capture">C5 — Logging and
Capture</h4>
<p>Three components capture shell output to disk. Disabling
__fish_config_op_logging skips all capture and removes the logging
wrappers.</p>
<pre><code>Component What it captures
───────────────────────────────────────────────────────────────────────────
Scrollback capture Terminal session output saved to:
~/.terminal_history/scrollback_YYYY-MM-DD_HH-MM-SS.log
paru wrapper All paru/AUR output captured to:
~/.terminal_history/paru_YYYY-MM-DD_HH-MM-SS.log
yay wrapper All yay/AUR output captured to:
~/.terminal_history/yay_YYYY-MM-DD_HH-MM-SS.log
Kitty watcher watcher.py captures scrollback when Kitty closes</code></pre>
<p>Logging coordination via sentinel file</p>
<p>C5 uses a sentinel file to synchronize state between the shell and
out-of-process components (the Kitty watcher and all running
shells):</p>
<pre><code>~/.config/fish/.logging_disabled</code></pre>
<p>Disabling __fish_config_op_logging:</p>
<ol type="1">
<li>Creates the sentinel immediately in every open shell.</li>
<li>Removes ~/.local/bin/paru and ~/.local/bin/yay logging wrappers;
bare /usr/bin/paru and /usr/bin/yay are used instead.</li>
<li>Kitty's watcher.py reads the sentinel on each save attempt and skips
capture — no Kitty restart required.</li>
<li>smart_exit stops saving scrollback logs.</li>
</ol>
<p>Re-enabling __fish_config_op_logging:</p>
<ol type="1">
<li>Removes the sentinel in every open shell.</li>
<li>Regenerates paru/yay logging wrappers in ~/.local/bin/.</li>
<li>Kitty watcher resumes capture on the next session exit.</li>
</ol>
<p>Changes propagate to all running shells through an event handler that
fires whenever __fish_config_op_logging changes — no shell restart
needed.</p>
<p>Note: C3 and C5 compose independently. C3 controls whether the
smart_exit wrapper is active at all; C5 controls only the
scrollback-capture block inside it. With C3 disabled, exit is plain
builtin exit regardless of C5.</p>
<h4 data-number="11.5.1.6" id="c6--greeting-and-first-run-ui">C6 —
Greeting and First-Run UI</h4>
<pre><code>Component What it shows
───────────────────────────────────────────────────────────────────────────
First-run welcome banner One-time message on first interactive session
fish_greeting override Empty function defined late in config.fish to
suppress distro greetings (e.g. CachyOS sets
fish_greeting to fastfetch by default)</code></pre>
<p>When C6 is disabled, no greeting is printed by this config. Any
greeting set by the distro or other configs runs normally — this config
simply does not override it.</p>
<h2 data-number="11.6" id="prompt-and-theme">Prompt and Theme</h2>
<h3 data-number="11.6.1" id="starship">Starship</h3>
<p>The primary prompt is Starship, initialized by conf.d/starship.fish.
Configure it via ~/.config/starship.toml.</p>
<p>conf.d/starship.fish defines a fish_prompt wrapper that only
activates when starship is in PATH. It emits OSC 133;A (prompt start)
immediately before Starship renders and OSC 133;B (input start)
immediately after, placing both markers on the prompt line itself. This
allows ov to use them as sticky section headers when browsing scrollback
logs. Without Starship, fish's built-in prompt handles these markers
automatically.</p>
<h3 data-number="11.6.2" id="fzf">FZF</h3>
<p>FZF is themed to Catppuccin Mocha via FZF_DEFAULT_OPTS set in
integrations/fzf.fish. The colors applied:</p>
<pre><code>Background: #1E1E2E (base) #313244 (surface0)
Foreground: #CDD6F4 (text)
Highlights: #F38BA8 (red) #CBA6F7 (mauve) #B4BEFE (lavender)</code></pre>
<p>To customize, override FZF_DEFAULT_OPTS in local.fish.</p>
<h3 data-number="11.6.3"
id="catppuccin-mocha-syntax-highlighting">Catppuccin Mocha Syntax
Highlighting</h3>
<p>The Catppuccin Mocha theme ships with this config in themes/ and is
applied on first run via <code>conf.d/first_run.fish</code>. Colors are
stored in fish_variables (universal). To switch variants, install a
different theme from themes/:</p>
<pre><code>fish_config theme save &quot;Catppuccin Latte&quot;</code></pre>
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