.kongo blog

space.vim – the smart space key for vim

kongo2002 — Mon, 31 May 2010 00:07:50 +0000

I want to present one of my all-time-favourite plugins for vim: space.vim
This plugin written by Henrik Öhman maps the key to act as a clever key to repeat all kinds of motions depending on the last actions.

This way the plugin hooks i.e. into search-commands like /, ?, *, # as well as navigation in the quickfix window and jumping through diffs.

I can strongly recommend this plugin as it heavily improves your navigation speed and comfort – just give it a try.

If you are interested I have got my own fork of the plugin on github. A few changes by me are already merged into the author’s repository. A few day ago I added support for tag-movement commands like :tnext, :tprev and

Links:
spiiph’s github repository (the author)
my space.vim fork on github

Read Time Stamp Counter in C

kongo2002 — Sun, 30 May 2010 23:40:55 +0000

While searching for a method to benchmark/profile some functions in C I stumbled upon the RDTSC (Read Time Stamp Counter). The TSC is a specific register available at least on x86 processors since the Pentium which counts the processor ticks since reset. The TSC is returned on the RDTSC call (opcode 0F 31) in EDX:EAX.

The following C function worked for me on x86_64 linux:

static inline unsigned long rdtsc()
{
    unsigned int lo, hi;
    __asm__ __volatile__("rdtsc" : "=a" (lo), "=d" (hi));
    return (unsigned long) hi << 32 | lo;
}

Unzip without path structure

kongo2002 — Sat, 29 May 2010 22:48:05 +0000

From time to time I need to unzip just a specific file archived inside a .ZIP file. It’s very unpleasant to unzip the whole archive or the single file with all the path structure inside the archive being recreated. The solution for this problem is the argument -j to junk all paths.
A typical workflow then would look like this:

unzip -l archive.zip
unzip -j archive.zip subdir/specific_file.c

To extract the file into a specific directory just append -d {directory} to the command:

unzip -j archive.zip subdir/specific_file.c -d c_files

vim – visual search

kongo2002 — Thu, 20 May 2010 13:52:11 +0000

For all of you who want to search for a visually selected string in vim – this small function might come in handy:

function! VSetSearch()
    let tmp = @@
    normal! gvy
    let @/ = '\V' . substitute(escape(@@, '\'), '\n', '\\n', 'g')
    call histadd('/', substitute(@/, '[?/]',
                \ '\="\\%d".char2nr(submatch(0))', 'g'))
    let @@ = tmp
endfunction

vnoremap * :<C-u>call VSetSearch()<CR>//<CR>
vnoremap # :<C-u>call VSetSearch()<CR>??<CR>

Now you can search as usual with * and # for the next and previous search match of the currently highlighted text.

changing X11 resolution on-the-fly

kongo2002 — Thu, 20 May 2010 10:58:11 +0000

Since I always seem to forget how to change the X11 resolution without restarting X11 I will post it here.

The tool to use is called xrandr (the X11 resize and rotation extension). You can check if the extension is loaded with some like:

grep -i randr /var/log/Xorg.0.log

That should output something similar to:

(==) RandR enabled
(II) Initializing built-in extension RANDR

Once you know the Xrandr extension is loaded you can change the resolution via:

xrandr --size 800x600

All available resolutions can be print to console with a simple call of xrandr without arguments:

xrandr

random vim hints

kongo2002 — Sat, 18 Apr 2009 10:18:50 +0000

Today I want to share some of my recently discovered (or good old-timers) tips for the vim editor.

If you are using highlighted search you can un-highlight the last search by typing :noh

A few day ago I wondered if it is possible to use a column-selection in vim. After a quick research I found the block-wise visual mode (CTRL-V) which is exactly what I was searching for. A quick summary of the different visual modes:

v - character-wise visual mode
V - line-wise visual mode
ctrl-v - block-wise visual mode (under win32 you can use the ctrl-q key binding)

The next useful command is the one-time insert command (CTRL-O) which allows you to ‘insert’ a single normal mode command while typing in insert mode. A typical usage might be to mark a line you are currently typing in via “CTRL-O ma”. That way you can continue typing in insert after marking the line.

If you are interested in case-insensitive searching the next one might be interesting: Combining the settings ‘set ignorecase‘ and ‘set smartcase‘ allows you to search case-insensitive by default but searches case-sensitive if the search string contains uppercase characters.

The next one is a quick way to convert tabs into space characters:

:set expandtab
:retab!

The last one for today is the position of the current line in the window:

zz - move current line to the center of the page
zt - move current line to the top of the page
zb - move current line to the bottom of the page

site of the moment: github

kongo2002 — Sat, 18 Apr 2009 00:17:45 +0000

It’s done: I’m now also member of github.com
By now you can find some of my config files and scripts for the dwm and awesome window managers on my account. For those of you who don’t know github yet: github.com is a social coding platform that allows sharing of open-source projects managed by the git revision control software developed by Linus Torvalds.

Just give it a try – it’s worth a look

dwm – incredible tiling wm

kongo2002 — Fri, 17 Apr 2009 19:40:26 +0000

Hi folks,

after an unbelieveable long time of inactivity I want to present my new window manager: dwm
dwm is surely the smallest and fastest tiling window manager I know. It’s currently written in under 2000 lines of source code and is only customizable through editing the config.h written in c. That way dwm supports exactly that features you are really planning to use and I like that very much.

Here’s a small screenshot of my current desktop:

my current desktop

clean your system with udept

kongo2002 — Thu, 20 Dec 2007 15:29:43 +0000

from time to time it can be very useful to check all of the installed packages on the system. often emerged packages pull a whole bunch of dependencies on the system. the problem is that these dependencies are not removed when the package that pulled in the other packages is unmerged.
officially there is a portage tool named depclean (emerge –depclean) that searches for unused packages that are not necessary for other packages. but everyone who once tried this tool can say that it’s not working that great. often really important packages are found to be unmerged and would badly damage the system.

a useful alternative for this problem is a tool named udept (which can be found in the portage tree in app-portage/udept)
in my experience it’s working nearly failure-free and relatively fast on the top. so just give it a try – it’s worth testing

some useful commands:
dep -dp (depclean-mode with pretend-flag)
dep -L (reverse dependencies from )
dep -l (dependencies from )
dep -Ln (reverse dependencies (+uninstalled) from )

udept
thread in gentoo forums

tune up your firefox

kongo2002 — Thu, 20 Dec 2007 14:53:37 +0000

I have found a nice way to tune up the buttons and input forms in mozilla firefox. as a linux user you may know the ugly buttons that don’t fit with the window and button design of the window manager. the key to these settings can be found in the forms.css.
Either create or edit your own forms.css or download an optimized one (which is what I did)

1. download the archive
wget http://users.tkk.fi/~otsaloma/art/firefox-form-widgets.tar.gz
2. extract the archive
tar -xvzf firefox-form-widgets.tar.gz
3. backup your forms.css
sudo cp /usr/lib/mozilla-firefox/res/forms.css /usr/lib/mozilla-firefox/res/forms.css.bak
4. add the new lines to the forms.css
cat firefox-form-widgets/res/forms-extra.css | sudo tee --append /usr/lib/mozilla-firefox/res/forms.css > /dev/null
5. copy new graphics
sudo cp -r firefox-form-widgets/res/form-widgets /usr/lib/mozilla-firefox/res

now you only have to restart firefox and enjoy the new layout: