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2013-11-02 20:54keyboard mappings

So I was at the Pittsburgh Perl Workshop, and John Anderson gave a talk about his personal configuration setup. It motivated me to spend quite a bit of time going over my own configuration, but in particular it reminded me that I had been wanting to adjust my keyboard for a while now. My pinkies have been getting tired more quickly lately, and I'm fairly sure this is in large part because of how often I have to use the Shift and Control keys. I do all of my work on laptops, so it would be pretty inconvenient to get an external keyboard, so I decided to actually put some effort into looking at ways to modify my existing keyboard to be easier to type on.

Control

One of the first things I did was read up ways to avoid finger stress. As it turns out, this is especially common in the Emacs community (since so many of their keyboard shortcuts rely on weird modifier key combinations), and there's even a project dedicated to making Emacs more ergonomic. One of the things that they do mention is that contrary to popular wisdom, mapping Caps Lock to Control really isn't a very good solution. They recommend swapping Control and Alt instead, since Control is used far more often, and you can press the Alt key with your thumb, which is a much stronger finger.

To do this, I added this to my .Xmodmap:

clear control
clear mod1
keycode 37 Alt_L Meta_L
keycode 64 Control_L
keycode 105 Alt_R Meta_R
keycode 108 Control_R
add control = Control_L Control_R
add mod1 = Alt_L Alt_R Meta_L Meta_R

Shift

The next thing I started thinking about was how to reduce the usage of the Shift keys. I do a lot of programming, which uses punctuation characters quite a bit, and so I started wondering if swapping the shifted and unshifted number row would be a good idea. As it turns out, Brock Wilcox did this quite a while ago, and he liked it a lot. Using that as a place to start, I came up with this script:

if xmodmap -pk | grep -q '(1).*(exclam).*(1).*(exclam)'; then
xmodmap -e 'keycode 10 = exclam 1'
    xmodmap -e 'keycode 11 = at 2'
    xmodmap -e 'keycode 12 = numbersign 3'
    xmodmap -e 'keycode 13 = dollar 4'
    xmodmap -e 'keycode 14 = percent 5'
    xmodmap -e 'keycode 15 = asciicircum 6'
    xmodmap -e 'keycode 16 = ampersand 7'
    xmodmap -e 'keycode 17 = asterisk 8'
    xmodmap -e 'keycode 18 = parenleft 9'
    xmodmap -e 'keycode 19 = parenright 0'
    xmodmap -e 'keycode 20 = underscore minus'
    xmodmap -e 'keycode 34 = braceleft bracketleft'
    xmodmap -e 'keycode 35 = braceright bracketright'
    xmodmap -e 'keycode 49 = asciitilde grave'
    xmodmap -e 'keycode 51 = bar backslash'
else
xmodmap -e 'keycode 10 = 1 exclam'
    xmodmap -e 'keycode 11 = 2 at'
    xmodmap -e 'keycode 12 = 3 numbersign'
    xmodmap -e 'keycode 13 = 4 dollar'
    xmodmap -e 'keycode 14 = 5 percent'
    xmodmap -e 'keycode 15 = 6 asciicircum'
    xmodmap -e 'keycode 16 = 7 ampersand'
    xmodmap -e 'keycode 17 = 8 asterisk'
    xmodmap -e 'keycode 18 = 9 parenleft'
    xmodmap -e 'keycode 19 = 0 parenright'
    xmodmap -e 'keycode 20 = minus underscore'
    xmodmap -e 'keycode 34 = bracketleft braceleft'
    xmodmap -e 'keycode 35 = bracketright braceright'
    xmodmap -e 'keycode 49 = grave asciitilde'
    xmodmap -e 'keycode 51 = backslash bar'
fi

I bound the script to pressing both Shift keys at once as Brock recommended (using xbindkeys):

"toggle_numkeys"
  Shift + Shift_R

"toggle_numkeys"
  Shift + Shift_L

and also set it to run when I logged into X. Note that this also maps a few other things - besides just the number row, it also makes tilde, underscore, left and right brace, and pipe into the unshifted characters for their respective keys. Underscore was the biggest win, I think - typing $variable_names_with_lots_of_words_in_them was always a pretty big strain.

Again as Brock pointed out, I had to remap the keys in some other applications to make them stay usable. Strangely enough, both i3 and Firefox continued to work (I have Mod4+1, etc mapped to switching desktops in i3, and Firefox uses Alt+1, etc for tab switching). Not really sure what's going on there. I did have to add some remappings for the hint mode in Pentadactyl though:

set hintkeys=")!@#$%^&*("

Zsh, readline, and vim also required remapping ) to 0, since I use the 0 command a lot. Here's from vimrc:

nmap <silent>) 0

and zshrc:

bindkey -M vicmd ')' vi-digit-or-beginning-of-line

and inputrc:

")": beginning-of-line

I couldn't figure out how to get the number keys in choose-window mode in tmux to remap (if anyone has any clues, let me know), but I did rebind the copy-mode command:

bind { copy-mode

So far, I've been using this setup for a little over two weeks, and I'm liking it a lot. My fingers are noticeably less tired, and I feel like my typing speed while programming is quite a bit faster. A lot of things feel more natural too - for instance, my ($foo_bar, $baz) = @_; is now typed entirely without pressing the Shift key, which feels much better. One thing that does still bother me is that (: now requires one shifted and one non-shifted key, which makes it harder to type, but I'm fairly sure that overall I use ; more than :, so I don't think switching that is worthwhile.

In addition to these keyboard remappings, I also remapped a bunch of things in vim to use fewer keystrokes, but I'll talk about that in a future post.

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