Notes about my Tmux and Vim

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Both Tmux and Vim are essential to my workflow. It is thus pertinent to inform you about their respective configuration files so that you know what to expect. This is with the proviso that you already are familiar with these tools.

About my tmux setup

Let’s start with the terminal multiplexer. It is the first thing you will interact with when you log into the session and type the key chord super + return:

~/cpdfd $ tree -aF tmux
└── .tmux.conf

0 directories, 1 file

Only its config is distributed with my dotfiles, which is another way of saying that I do not use any plugins whatsoever. What is provided by the program itself is more than enough.

To send commands to tmux you must typically start by first pressing its prefix key, which I have kept to the default of Ctrl + b as it is the one that causes no issues with other programs’ main functionality, in the way I use them. To be clear, Ctrl + b does interfere with a couple of commands: (a) the command line motion for moving one character backwards and (b) Vim’s full page back scroll.

So you press the prefix key, then release it and you can then either access the command prompt by inputting the colon : sign or typing one of the many key sequences that are assigned to direct actions (see table below).

In the configuration file, modifier keys are shortened. So Ctrl + b is written as C-b, Alt is A. Note that Shift is not used directly, but is instead implied by the use of a capital letter (just to be sure: Shift inserts the majuscule of the given letter).

Here are the main key bindings to get you started:

# Those that involve C-b (prefix)
# -------------------------------
<prefix> s        # split current pane horizontally
<prefix> v        # split current pane vertically
                  ### these are similar to Vim's C-w {s,v}
<prefix> S        # split the whole window horizontally
<prefix> V        # split the whole window vertically
<prefix> x        # kill current pane
<prefix> C-x      # kill all panes except the current one
<prefix> r        # reload the tmux conf
<prefix> m        # mark active pane
<prefix> C-m      # toggle maximise active pane
                  ### the default is <prefix> z (too close to x)
<prefix> A-{1-5}  # switch to one of the five layout presets
<prefix> E        # evenly spread out active and adjacent panes
<prefix> c        # create a new window (windows contain panes)
<prefix> b        # break pane from current window
                  ### default is <prefix> !
<prefix> J        # the opposite of break-pane
<prefix> Tab      # swap active pane with the previous one
<prefix> C-Tab    # swap active pane with the marked one
<prefix> a        # sync input across panes in the current window

# Keys without the prefix
# -----------------------
A-{h,j,k,l}       # navigate panes in the given direction
A-S-{h,l}         # move to left/right window
C-Space           # enter copy-mode
                  ### use Vim keys to scroll, select/copy text

Read .tmux.conf for the entirety of my settings and custom key bindings. That file is heavily documented, as is the norm with practically every item in my dotfiles.

Now if you are thinking that you do not need a terminal multiplexer and have no time to learn how to use one, I urge you to think again. This is a great skill to master. It greatly improves the overall use of the terminal. It is a skill that is highly portable. It will come in handy in a variety of situations whereas, to be blunt, learning bspwm may not be particularly useful outside the narrow confines of a custom desktop session.

Tmux is superior to a standard terminal because it offers unique capabilities:

  • Persistent local/remote sessions (even if you close the terminal or log out). Once you use this, there is no going back.
  • Advanced management of a large number of pseudo-terminals by leveraging window splitting (panes) like a tiling window manager, pane grouping per window (the equivalent of tabs/workspaces), and sessions (sessions hold windows, windows hold panes).
  • Scriptability including the possibility to send key sequences to running applications (I use this to source my .vimrc when I perform a live theme change, as noted in the chapter about my Tempus themes).

About my Vim setup

That last piece of advice holds true for vim as well. Spend some time learning its basics. Over time you will become proficient at editing text.

And here is another piece of advice, before we delve into the specifics of my Vim setup: set a very high bar for the use of plugins or, as in my case, do not use plugins at all. Also avoid copy-pasting stuff without carefully considering the ramifications.

The more comfortable you are with the generic program, the higher the portability of your knowledge. Vim is meant to be used as the standard UNIX editor that is available in virtually every such machine out there. Straying too much from the defaults might impede your ability to work effectively under circumstances that are not under your immediate control.

Now on to my customisations.

~/cpdfd $ tree -aF vim
├── .vim/
│   ├── colors/
│   │   ├── tempus_autumn.vim
│   │   ├── tempus_classic.vim
│   │   ├── tempus_dawn.vim
│   │   ├── tempus_day.vim
│   │   ├── tempus_dusk.vim
│   │   ├── tempus_fugit.vim
│   │   ├── tempus_future.vim
│   │   ├── tempus_night.vim
│   │   ├── tempus_past.vim
│   │   ├── tempus_rift.vim
│   │   ├── tempus_spring.vim
│   │   ├── tempus_summer.vim
│   │   ├── tempus_tempest.vim
│   │   ├── tempus_totus.vim
│   │   ├── tempus_warp.vim
│   │   └── tempus_winter.vim
│   └── spell/
│       ├── el.utf-8.spl
│       ├── el.utf-8.sug
│       ├── en.utf-8.add
│       └── en.utf-8.add.spl
└── .vimrc

3 directories, 19 files

A quick rundown of my very short and simple .vimrc:

  • I stick to the default key bindings.
  • I expect Vim to ask for confirmation when closing a modified buffer.
  • I use tabs instead of spaces for indentation, setting the width of the tab character to be equal to four spaces. I used to use spaces when I first started using a text editor, because that was the default. However, experience suggests that tabs are semantically more appropriate for indentation. The tab key inserts its own character, which can have an arbitrary width defined by the program that reads it. In short, tabs are better for indentation, while spaces are better for tabular layouts such as the tmux key table I presented above.
  • The text width is 72 blocks long. This is particularly important for writing good git commit messages. And, because git is designed with email in mind, this line length is ideal for sending plain text email, such as with mutt. In general, this line length also makes sense for comment blocks in your code, because it makes them easier to read without having to rely on non-standard things like text-wrapping (so, for example, hitting gqip will format inside the given paragraph, while gq does the same over the given selection).
  • Sentences in a paragraph start with two spaces after a period or full stop. This is better visually when typing in a monospaced font. The various parsers, e.g. Markdown to HTML, know how to convert that to a single space, just as they know how to turn hard line wraps between consecutive lines of text into uniform paragraphs (a blank line marks a new paragraph).
  • Syntax highlighting is on and uses my Tempus themes. Do not edit this part manually, as it will be changed when running tempus or its tempusmenu interface (see chapter on Tempus themes).

Read the .vimrc for an in-depth understanding of my customisations (it is a straightforward, well-commented config).

Neither Tmux nor Vim is an OS

Now you may be wondering how it is possible to use Tmux and Vim without plugins and all the accoutrements of a modern workflow. The answer is rather simple: let Tmux+Vim be specialised tools and leave the rest to other programs.

Do you really need Vim’s sub-par approach to multiplexing (its own approach to splits, buffers, tabs) when you can just be a tmux ninja? What, you need more than that? Let me tell you about this nice program called BSPWM… Why do you require a plugin to check git information inside Vim when you can just use the command line? Open a new tmux split and type git status, git log, git diff… You need to commit only parts of a changed file? Know that git add --patch is your friend.

In the same spirit, use the core utilities like cd, ls, find, grep, cp, mv, rm. Keep things simple and avoid feature creep. Let the text editor edit text. Keep the multiplexer true to its spirit of managing terminal sessions. If you truly need an extensible, fully-customisable integrated development environment, then you should seriously consider GNU Emacs (which is a Lisp interpreter that implements a text editor among many others).

Of course, there are scenaria where a plugin makes a program better for the task at hand. My point is that you should be very picky about your choice of external functionality. GNU/Linux is a powerful OS (Emacs too!). You do not need to incorporate every kind of feature in the core tool. Perhaps there are other operating systems that make things difficult for the power user: if you are using one of those, then a pile of plugins is the least of your troubles.

As a closing remark, let me leave you with a joke I once heard about Emacs (a tool that I genuinely like and will eventually incorporate in my computing life): its name is an allusion to its design that involves active use of modifier keys… Escape, Meta, Alt, Control, Shift.