config.phundrak.com/docs/fish.org

#+TITLE: Fish
#+setupfile: headers
#+PROPERTY: header-args:fish :mkdirp yes :tangle ~/.config/fish/config.fish :exports code :noweb yes
#+PROPERTY: header-args :exports code :tangle no

* Fish
The file present in =~/.config/fish/config.fish= is the configuration file for
the [[https://fishshell.com/][fish shell]]. It contains custom functions, environment variables and
abbreviations.

Just in case, we might sometimes need to declare the fish function =fish_title=
as =true=, so let’s do so.
#+BEGIN_SRC fish
function fish_title
    true
end
#+END_SRC

** Fish from within Emacs
I sometimes call fish from within emacs, with =M-x ansi-term=. In this case, the
variable =TERM= needs to have the value =eterm-color=.
#+BEGIN_SRC fish
if test -n "$EMACS"
    set -x TERM eterm-color
end
#+END_SRC

** Global variables
An important thing to do is to load all variables from my =~/.profile=
file (which you can find [[https://labs.phundrak.com/phundrak/dotfiles/src/branch/master/.profile][here]]). The [[https://github.com/oh-my-fish/plugin-foreign-env][foreign-env]] plugin comes in handy:
#+begin_src fish
fenv source ~/.profile
#+end_src

*** Development
Finally, some development packages require the =PKG_CONFIG_PATH= to be set, so
let’s do so.
#+BEGIN_SRC fish
set -gx PKG_CONFIG_PATH /usr/local/lib/pkgconfig/ $PKG_CONFIG_PATH
#+END_SRC

** Tramp remote access
When accessing from a remote machine our computer from Emacs, tramp
needs a precise shell appearance: a simple =$= followed by a space after
which to put the commands it needs to execute, and nothing else. Due
to this, let’s deactivate and redefine some functions defining the
appearance of fish.
#+BEGIN_SRC fish
if test "$TERM" = "dumb"
    function fish_prompt
        echo "\$ "
    end
    function fish_right_prompt; end
    function fish_greeting; end
    function fish_title; end
end
#+END_SRC

** Regular fish shell appearance
Now, there is only one function I modify when it comes to the
appearance of fish when I’m the one using it: the ~fish_greeting~
function. I just want it empty.
#+BEGIN_SRC fish
function fish_greeting; end
#+END_SRC

For my fish prompt, I use [[https://starship.rs][starship]], a shell-agnostic prompt. Let’s load it:
#+begin_src fish
starship init fish | source
#+end_src

** Setting up external tools
*** Starship configuration
:PROPERTIES:
:header-args:toml: :tangle ~/.config/starship.toml
:END:
As mentioned above, starship is a shell-agnostic prompt, written in Rust and which can be configured separately from the shell. I decided to configure it here though, since fish is the only shell I use which is compatible with starship.

First I’ll modify the default format variable, removing the modules I don’t need.
#+begin_src toml
format = """
$username\
$hostname\
$shlvl\
$singularity\
$kubernetes\
$directory\
$vcsh\
$git_branch\
$git_commit\
$git_state\
$git_metrics\
$git_status\
$hg_branch\
$docker_context\
$package\
$cmake\
$dart\
$deno\
$lua\
$nodejs\
$python\
$rlang\
$rust\
$scala\
$zig\
$memory_usage\
$env_var\
$custom\
$cmd_duration\
$line_break\
$jobs\
$battery\
$time\
$status\
$shell\
$character"""
#+end_src

I want starship to be able to detect Lisp files, be it CommonLisp or EmacsLisp. Unfortunately, it seems nerd-font doesn’t have any symbol for either language, so I’m just using a lambda character.
#+begin_src toml
[custom.lisp]
extensions = ["lisp", "el"]
symbol = "λ "
style = "bold green"
#+end_src

Finally, let’s disable all modules I don’t need.
#+begin_src toml
[cobol]
disable = true
[dotnet]
disable = true
[elixir]
disable = true
[elm]
disable = true
[erlang]
disable = true
[golang]
disable = true
[helm]
disable = true
[java]
disable = true
[julia]
disable = true
[kotlin]
disable = true
[nim]
disable = true
[ocaml]
disable = true
[perl]
disable = true
[php]
disable = true
[pulumi]
disable = true
[purescript]
disable = true
[red]
disable = true
[ruby]
disable = true
[swift]
disable = true
[terraform]
disable = true
[vlang]
disable = true
[vagrant]
disable = true
[nix_shell]
disable = true
[conda]
disable = true
[aws]
disable = true
[gcloud]
disable = true
[openstack]
disable = true
[crystal]
disable = true
#+end_src

*** Loading ~zoxide~
~zoxide~ is a smarter ~cd~ command, accessible through ~z~. It can be loaded like so:
#+begin_src fish
zoxide init fish | source
#+end_src

** Abbreviations
#+NAME: generate-abbr
#+BEGIN_SRC emacs-lisp :var table=[] :exports none :tangle no
(replace-regexp-in-string "\\\\vert[{}]*"
                          "|"
                          (mapconcat (lambda (x) (format "abbr %s '%s'" (car x) (cadr x)))
                                     table
                                     "\n")
                          t t)
#+END_SRC

Abbreviations are a great way to keep correctly track of which commands are run
in the shell without polluting the history of the shell with obscure commands.
When typing an abbreviation, fish will replace it with replace it with its
expanded equivalent. Below are some of the abbreviations I use. Be aware some of
them that invoke GUI programs can be invoked through ~devour~ which will make
the terminal disappear while the program runs, and once the GUI program exists
the terminal window will come back.

*** System monitoring
Here I have some abbreviations which are quite useful when performing
some system monitoring. With =df=, we can get an overview of our
filesystem usage, while with =diskspace= we get some more precise
information. =meminfo= is a call to =free= with sane defaults, and similar
to =meminfo=, we also have =gpumeminfo= to get a quick look at the
memory-related logs of our X session. I also declared =cpuinfo= an alias
of =lscpu= in order to keep consistent with =meminfo=. =pscpu= gives us
information on what the CPU is running right now, and =pscpu10= limits
that to the top 10 threads. Similarly, =psmem= gives us information on
the memory usage of the current threads, and =psmem10= only the ten most
important threads in terms of memory usage.
#+NAME: mgmt-abbr
| abbreviation | command                                    |
|--------------+--------------------------------------------|
| df           | df -H                                      |
| diskspace    | sudo df -h \vert grep -E "sd\vert{}lv\vert{}Size"          |
| du           | du -ch                                     |
| meminfo      | free -m -l -t                              |
| gpumeminfo   | grep -i --color memory /var/log/Xorg.0.log |
| cpuinfo      | lscpu                                      |
| pscpu        | ps auxf \vert sort -nr -k 3                    |
| pscpu10      | ps auxf \vert sort -nr -k 3 \vert head -10         |
| psmem        | ps auxf \vert sort -nr -k 4                    |
| psmem10      | ps auxf \vert sort -nr -k 4 \vert head -10         |

#+begin_SRC fish
<<generate-abbr(table=mgmt-abbr)>>
#+END_SRC

*** System management (packages and services)
I added some of these abbreviations due to how often I have to write the whole
thing.

**** Package management
The first command is =remove= which removes a package from my system, as well as
its dependencies no longer needed. =p=. =pacman='s or =paru='s. This is why I
simply type =purge=. And if I want to simply seach among the =pacman= repos, I
can type =search=. Otherwise, if I want to include AUR results, I’ll use =paru=.

#+NAME: pm-abbr
| abbreviation | command          |
|--------------+------------------|
| remove       | sudo pacman -Rsc |
| purge        | paru -Sc         |

#+BEGIN_SRC fish
<<generate-abbr(table=pm-abbr)>>
#+END_SRC

**** Service management
I don’t have the muscle memory of =systemctl=. So instead, I simply type =c=
when I want to do something user service related. And if I want to manipulate
system services, I can instead type a simple capital =S=.
#+NAME: service-abbr
| abbreviation | command          |
|--------------+------------------|
| s            | systemctl        |
| suser        | systemctl --user |

#+BEGIN_SRC fish
<<generate-abbr(table=service-abbr)>>
#+END_SRC

*** Development
A good amount of these commands are development related, especially when it
comes to compilation or Docker.

**** CMake
I have the following abbreviations to quickly run CMake and create a
configuration for debug or release profiles.
#+NAME: abbr-cmake
| abbreviation | command                          |
|--------------+----------------------------------|
| cdebug       | cmake -DCMAKE_BUILD_TYPE=Debug   |
| crelease     | cmake -DCMAKE_BUILD_TYPE=Release |

Here is the corresponding fish configuration:
#+BEGIN_SRC fish
<<generate-abbr(table=abbr-cmake)>>
#+END_SRC

**** Docker
And of course, when it comes to Docker Compose, I don't have time to write the
full command, so I use these instead.
#+NAME: abbr-docker
| abbreviation | command                      |
|--------------+------------------------------|
| dc           | docker-compose               |
| dcb          | docker-compose build         |
| dcd          | docker-compose down          |
| dcl          | docker-compose logs          |
| dclf         | docker-compose logs -f       |
| dcp          | docker-compose pull          |
| dcr          | docker-compose run --rm      |
| dcu          | docker-compose up            |
| dcub         | docker-compose up --build    |
| dcud         | docker-compose up -d         |
| dcudb        | docker-compose up -d --build |

Here is the corresponding fish configuration:
#+BEGIN_SRC fish
<<generate-abbr(table=abbr-docker)>>
#+END_SRC

**** Text editors
I greatly prefer to use Emacsclient as my main text editor; Emacs has basically
all I need. So, it's only normal I have an abbreviation to launch a new instance
of it. If launched in the terminal, I’ll usually want Emacs to be displayed in
CLI mode and not in GUI mode, otherwise I would invoke it with my WM’s shortcut.
In case we want to launch Emacs in GUI mode anyway, ~egui~ is available too.

#+NAME: abbr-text-ed
| abbreviation | command               |
|--------------+-----------------------|
| e            | emacsclient -c -n     |
| egui         | devour emacsclient -c |

Here is the corresponding fish configuration:
#+BEGIN_SRC fish :noweb yes
<<generate-abbr(table=abbr-text-ed)>>
#+END_SRC

**** Compilation
By default, I set ~clang~, ~clang++~, ~gcc~ and ~g++~ to the latest standard and
with the ~-Wall~ flag activated.
#+NAME: abbr-comp
| abbreviation | command              |
|--------------+----------------------|
| clang        | clang -Wall          |
| clang++      | clang++ -Wall        |
| g++          | g++ -Wall -std=c++20 |
| gcc          | gcc -Wall -std=c18   |

Here is the corresponding fish configuration:
#+BEGIN_SRC fish
<<generate-abbr(table=abbr-comp)>>
#+END_SRC

**** Git
And let's face it: we all at one point just wanted to commit our code without
thinking about the message, to just get over with it. Don't worry, I got you
covered.
#+NAME: abbr-git
| abbreviation | command                                             |
|--------------+-----------------------------------------------------|
| randcommit   | git commit -m (curl -s whatthecommit.com/index.txt) |

Here is the corresponding fish configuration:
#+BEGIN_SRC fish
<<generate-abbr(table=abbr-git)>>
#+END_SRC

*** LaTeX
Yes, although I use org-mode, I still have some use for LaTeX, especially when
it comes to PDF exports of my org files. Hence, why I use the LaTeX package
manager. It is recommended to use ~tllocalmgr~ instead of ~tlmgr~, but I can
never remember the command, and the latter is faster to type, so time for an
abbreviation. Same goes for ~texhash~ which must be run as sudo.
#+NAME: latex-abbr
| abbreviation | command      |
|--------------+--------------|
| tlmgr        | tllocalmgr   |
| texhash      | sudo texhash |

Here is the corresponding fish configuration:
#+BEGIN_SRC fish
<<generate-abbr(table=latex-abbr)>>
#+END_SRC

*** Some security measures
Some commands can be quite dangerous when not used properly, which is
why I added default flags and options in order to get warnings before
things get ugly. The =-i= and =-I= add prompts in case we might not want
to do what we asked the shell to do. Notice =lns= which creates
symlinks, =rmd= which removes directories, =rmf= which forces deletion,
and =rmdf= which forces the delition of a directory. Notice also the
=--preserve-root= which will prevent me from accidentally removing the
root folder. I added the same option to =chgrp=, =chmod=, and =chown=.
#+NAME: sec-abbr
| abbreviation | command                  |
|--------------+--------------------------|
| cp           | cp -i                    |
| rsync        | rsync -Pa --progress     |
| ln           | ln -i                    |
| lns          | ln -si                   |
| mv           | mv -i                    |
| rm           | rm -Iv                   |
| rmd          | rm --preserve-root -Irv  |
| rmdf         | rm --preserve-root -Irfv |
| rmf          | rm --preserve-root -Ifv  |
| chgrp        | chgrp --preserve-root -v |
| chmod        | chmod --preserve-root -v |
| chown        | chown --preserve-root -v |

Here is the corresponding fish configuration:
#+BEGIN_SRC fish
<<generate-abbr(table=sec-abbr)>>
#+END_SRC

*** Typos
Let's admit it, we all make typos from time to time in the shell, and some are
recurrent enough we make abbreviations or aliases of the correct command. Well,
I have some of my abbreviations which were make exactly because of this.
Sometimes for some reasons, my brain makes me write ~clean~ instead of ~clear~.
So, let's just replace the former by the latter. I'm also very bad at typing
~exit~. And sometimes I suck at typing ~htop~.
#+NAME: typo-abbr
| abbreviation | command |
|--------------+---------|
| clean        | clear   |
| exi          | exit    |
| exti         | exit    |
| hotp         | htop    |

Here is the corresponding fish configuration:
#+BEGIN_SRC fish
<<generate-abbr(table=typo-abbr)>>
#+END_SRC

*** Misc
Finally, some miscellaneous abbreviations that don't really fit into any of the
above categories.

**** Screens setup
I have an automatic screen setup for when I am at home, but it
unfortunately doesn’t match my setup at work. =autorandr horizontal=
does not work because my third screen is vertical, the wallpaper is
misaligned, and picom becomes too taxing on my system. I ended up
writing the following command each morning, but now a simple abbrev
does the work for me.
#+begin_src fish
abbr work 'autorandr -l work; xwallpaper --zoom (cat $HOME/.cache/wallpaper); pkill picom'
#+end_src

**** Media
Here you will find various commands related to media in general. The
first one is a command to play some chillhop from the [[https://www.youtube.com/@LofiGirl][Lofi Girl
YouTube channel]]'s livestream.
#+BEGIN_SRC fish
abbr chill 'mpv --force-window=no --no-video "https://www.youtube.com/watch?v=jfKfPfyJRdk" &'
#+END_SRC

When it comes to mpv, I do not want to force it to open a graphical window if
for example I want to listen to an audio file. I also do not want any border on
that window. So, I declared this abbreviation.
#+BEGIN_SRC fish
abbr mpv 'mpv --no-border --force-window=no'
#+END_SRC

When I want to download a song from YouTube, I'll just use the command ~flac
videoIdentifier~ to get it through ~youtube-dl~.
#+BEGIN_SRC fish
abbr flac 'youtube-dl -x --audio-format flac --audio-quality 0 -o "~/Music/%(uploader)s/%(title)s.%(ext)s"'
#+END_SRC

Some sane default options for [[https://github.com/nsxiv/nsxiv][~nsxiv~]]. This includes playing GIFs and
not displaying the filename below. Nsxiv will also open in fullscreen
and will fit the displayed image to the frame. It will also output to
stdout the selected files in case I want to pipe them to another
program.
#+BEGIN_SRC fish
abbr nsxiv 'nsxiv -abfos f'
#+END_SRC

The following abbreviation is here to launch software with my Nvidia
GPU.
#+begin_src fish
abbr nv 'env __NV_PRIME_RENDER_OFFLOAD=1 __GLX_VENDOR_LIBRARY_NAME=nvidia'
#+end_src

Finally, let's declare the following abbreviation that will launch a MPV
instance displaying my webcam:
#+BEGIN_SRC fish
abbr webcam 'devour mpv --demuxer-lavf-format=video4linux2 --demuxer-lavf-o-set=input_format=mjpeg av://v4l2:/dev/video0 --profile=low-latency --untimed'
#+END_SRC

**** Sudo
First, I make it so that ~sudo~ comes with the ~-A~ switch in order to call my
custom graphical script for getting my password (see [[file:bin.org::#Askpass-d0d7a8c0][askpass]]). I also made it so
~please~ is an equivalent to ~sudo -A~ as a joke.
#+BEGIN_SRC fish
abbr please 'sudo -A'
#+END_SRC

**** History
I find it more intuitive and faster to just write ~hist~ instead of ~history~,
so let's declare that.
#+BEGIN_SRC fish
abbr hist history
#+END_SRC

**** Compression
It seems it's just like many other people, but I cannot for the life
of me remember the syntax of ~tar~. So, I made the following
abbreviations, and one day hopefully, after seeing the abbreviations'
expansion over and over I'll remember the command like I did for the
abbreviation of ~remove~ (see [[file:./fish.md#package-management][Package management]]).
#+NAME: tar-abbr
| abbreviation | command   |
|--------------+-----------|
| compress     | tar -czf  |
| untar        | tar -xvzf |

#+BEGIN_SRC fish
<<generate-abbr(table=tar-abbr)>>
#+END_SRC

**** exa
#+NAME: exa-abbr
| abbreviation | command                                    |
|--------------+--------------------------------------------|
| exa          | exa -halg@ --group-directories-first --git |
| lsl          | exa -halg@ --group-directories-first --git |

#+BEGIN_SRC fish
<<generate-abbr(table=exa-abbr)>>
#+END_SRC

**** Network Management
First, we have just =nmcli= with sane default options, that is a pretty output
with colors.
#+BEGIN_SRC fish
abbr nmcli 'nmcli -p -c auto'
#+END_SRC

**** NordVPN
Next, we have some NordVPN-related shortcuts. The first one is a simple
abbreviation to =nordvpn=. The second one is a shortcut to connect to a server,
and to disconnect from the current server. I also have a couple of shortcuts to
quickly connect to some preselected countries, mainly France, Germany, Japan and
the US.
#+NAME: nordvpn-abbr
| abbreviation | command                 |
|--------------+-------------------------|
| n            | nordvpn                 |
| nc           | nordvpn c               |
| nd           | nordvpn d               |
| ncf          | nordvpn c France        |
| ncg          | nordvpn c Germany       |
| ncj          | nordvpn c Japan         |
| ncu          | nordvpn c United_States |

#+BEGIN_SRC fish
<<generate-abbr(table=nordvpn-abbr)>>
#+END_SRC

**** Wget
By default, continue a download that was interupted.
#+BEGIN_SRC fish
abbr wget 'wget --hsts-file="$XDG_DATA_HOME/wget-hsts" -c'
#+END_SRC

** Last thing before we’re done
For some reason, Fish began searching for packages when I enter a command name
wrong. For instance, if I type ~vim~, I get something like this:
#+BEGIN_SRC text :tangle no
$ vim
fish: Unknown command: vim
usr/bin/vim is owned by extra/gvim 8.2.2653-1
usr/bin/vim is owned by extra/vim 8.2.2653-1
#+END_SRC

But I don’t want that, it slows down my shell. So, in order to fix that, we need
the following lines:
#+BEGIN_SRC fish
function fish_command_not_found
    __fish_default_command_not_found_handler $argv
end
#+END_SRC

Tadah! No more package suggestions from fish!

I also have some private abbreviations I don’t want people to know
about that I store in a separate configuration file.
#+begin_src fish
source $HOME/.config/fish/private.fish
#+end_src