Today the classic, and old, Common Desktop Environment (a.k.a. CDE) was released into the Open Source world.
You can get the very alpha version at SourceForge.
I haven't been able to get a running version by now, but I keep trying.
Good job, guys.
Working with git a lot I decided I needed some git status
in my prompt.
I searched the web and some solutions where almost what I wanted and this one by Sebastian Celis came very close.
But it didn't work with my version of zsh, because that didn't seem
to understand the =~ operator.
I also think Sebastian makes things over complicated and so I changed some things aroud.
This is what I came up with:
First make sure this code is included in your ~/.zshenv file
prompt_git_info()
{
unset __GIT_BRANCH
unset __GIT_BRANCH_STATUS
unset __GIT_BRANCH_DIRTY
local st="$(git status 2>/dev/null)"
if [[ -n "$st" ]]; then
local -a arr
arr=(${(f)st})
if [[ $arr[1] = *Not\ currently\ on\ any\ branch.* ]]
then
__GIT_BRANCH='no-branch'
else
__GIT_BRANCH="${arr[1][(w)4]}"
fi
if [[ $arr[2] = *Your\ branch\ is* ]]
then
if [[ $arr[2] = *ahead* ]]
then
__GIT_BRANCH_STATUS='ahead'
elif [[ $arr[2] = *diverged* ]]
then
__GIT_BRANCH_STATUS='diverged'
else
__GIT_BRANCH_STATUS='behind'
fi
fi
if [[ $st = *nothing\ to\ commit* ]]
then
__GIT_BRANCH_DIRTY='0'
else
__GIT_BRANCH_DIRTY='1'
fi
fi
if [[ -n "$__GIT_BRANCH" ]]
then
local s="("
s+="$__GIT_BRANCH"
case "$__GIT_BRANCH_STATUS"
in
ahead) s+="↑" ;;
diverged) s+="↕" ;;
behind) s+="↓" ;;
esac
if [[ "$__GIT_BRANCH_DIRTY" = "1" ]]
then
s+="⚡"
fi
s+=")"
printf " %s%s" "%{${fg[yellow]}%}" $s
fi
}
and set your prompt to something like this
PS1=$'$C_CYAN%n@%m$(prompt_git_info) $C_WHITE%2~$ $C_OFF'
When I now switch to a directory that is under control of git I get gt status
messages in my prompt, like
tonk@mach (master⚡) ~/dir$ git commit -a [master fca5ac3] Nice, new stuff. 6 files changed, 88 insertions(+), 12 deletions(-) tonk@mach (master↑) ~/.dir$ git status # On branch master # Your branch is ahead of 'origin/master' by 1 commit. # nothing to commit (working directory clean) tonk@mach (master↑) ~/.dir$
Today I released version 0.8 of We-Blog.
I created a Google project and a Google discussion group.
Version 0.8 is now the stable branch and 0.9 the development branch.
Well, to be really honest, not that much. I fixed some minor bugs and did a lot
of code cleanup. Although the original code of Jaromir was very nice, there was
some room for improvement. I removed a lot of double functions and variables
and put them all together in a We.pm Perl module. Saves a lot of work with an
update.
It often happens that I get into a situation
where I need to know key codes of pressed
keys. On my Mac that's simple. Just use the
Key Codes by Many Tricks.
But on Linux I constantly was trying to find out which key produced what.
So I ended up writing a program for that. I started of in the shell, but that ended up being rather tricky and unnecessary complicated. So I redid the whole thing in C.
This is the result
/* * Program : code.c * Author : Ton Kersten */ #include <stdio.h> #include <curses.h> #define DONE 'q' #define ESC 0x1b #define SPC 0x20 char ch; main() { printf("Press '%c' to quit!\n\n", DONE); /* * Put the terminal in raw mode, with no echo */ system("stty raw -echo"); /* * Print the header */ printf("%4s\t%4s\t%4s\t%4s\r\n", "Char", " Hex", " Oct", " Dec"); printf("%4s\t%4s\t%4s\t%4s\r\n", "----", "----", "----", "----"); /* * Set the initial loop value to something odd */ ch = DONE-1; while ( ch != DONE ) { ch = getchar(); /* * Character read. Display it. Look out for < 0x20 */ if ( ch < SPC ) { if ( ch == ESC ) { /* * Esc. Just say 'Esc' */ printf("%-4s\t0x%02x\t%04o\t%04d\r\n", "Esc", ch, ch, ch); } else { /* * < ' '. Print Control character */ printf("^%-c\t0x%02x\t%04o\t%04d\r\n", ch-1+'A', ch, ch, ch); } } else { /* * Normal character. Display it normally */ printf("%-4c\t0x%02x\t%04o\t%04d\r\n", ch, ch, ch, ch); } } /* * Put the terminal back to something usefull */ system("stty sane echo"); }
And this is an example of the output
Press 'q' to quit! Char Hex Oct Dec ---- ---- ---- ---- Esc 0x1b 0033 0027 O 0x4f 0117 0079 P 0x50 0120 0080 Esc 0x1b 0033 0027 [ 0x5b 0133 0091 2 0x32 0062 0050 4 0x34 0064 0052 ~ 0x7e 0176 0126 q 0x71 0161 0113
During one of my teaching sessions a student asked me if it was possible to find the number of spaces in a variable.
As with all questions in Linux and UNIX the answer is a simple
Of course that's possible. In UNIX and Linux everything is possible.
With some sed or awk this can be done within
seconds. But I wanted it done completely within
the shell, in this case bash.
This is what I came up with
P="John and Paul and Ringo and George where the Beatles" R=${P//[! ]/} # Remove everything that is NOT a space echo ${#R} # Show the number of characters (spaces) that are left
And this also works in the Korn shell (ksh) and the Z-shell (zsh).
Today I've posted a new version of the header program.
Nothing really fancy happened, just added support for zonefiles, in this
case the Bind ones.
It's available at the usual places.
I'm creating a Puppet Starter Kit with some standard manifests included and a
complete set of documentation. All documentation should be written in
Markdown and will be served
by Markdoc. But I want to generate all Markdown files
from the Puppet manifests, so I only need to document the manifest file.
Generating the Markdown is not that difficult, except that I kept ending up
with empty lines at the top of the manifest code and I wanted to get rid of
those. Of course this should be done with sed, because the whole generation
process is written in bash. When playing around with sed I found
sed '/./,$!d' filename
which, I think, is genius in it's simplicity. After you find something, do not remove. Life in UNIX and Linux is nice!
When working with Puppet and a VCS (like git and SVN)
it's nice to have a simple way of updating the Puppet tree.
My tree is always in /etc/puppet and owned by user and group
puppet. User puppet is allowed to checkout the complete
tree from git or subversion.
I have created two one-liners to update the complete tree and make sure all rights are still correct.
update_svn
#!/bin/bash # update_svn su - puppet -c 'cd /etc/puppet; svn up; cd doc; ../bin/gendoc'
update_git
#!/bin/bash # update_git su - puppet -c 'cd /etc/puppet; git pull; cd doc; ../bin/gendoc'
But, of course, it's not handy to type update_git today and update_svn
tomorrow. And I also don't want a path to /etc/puppet/bin.
The solution is a very simple one, as always:
cd /usr/local/bin
ln -s /etc/puppet/bin/update_git pupdate
and now I only have to type pupdate and things work out.
The new kernel for the EeePC (2.6.25) has deprecated the
/proc/acpi/battery interface, so I had to write a new
script for use in my own zsh prompt.
The script will work in both 2.6.24 and 2.6.25, so without further ado, here it is. It is written as a function for easy inclusion in any prompts.
#!/bin/zsh bat() { PROC=/proc/acpi/battery/BAT0 SYS=/sys/class/power_supply/BAT0/uevent STATE= # dc: design capacity, rc: remaining capacity if [ -f $PROC/info ] then STATE=$PROC/state # 2.6.24 dc=$(grep 'last full' < $PROC/info | awk '{ print $4 }') rc=$(grep 'remaining' < $PROC/state | awk '{ print $3 }') elif [ -f $SYS ] then STATE=$SYS # 2.6.25 dc=$(grep '\<power_SUPPLY_CHARGE_FULL\>' < $SYS | awk -F= '{ print $2 }') rc=$(grep '\<power_SUPPLY_CHARGE_NOW\>' < $SYS | awk -F= '{ print $2 } ') else exit fi p=$(echo 3k $rc $dc / 100 \* p | dc ) if grep -iq discharging $STATE then printf " %02d" "$p" else if [ ${p%.*} -lt 100 ]; then printf " %02d+" "$p" fi fi } bat
After some tweaking I even made a better one which
saves a few greps.
#!/bin/zsh bat() { PROC=/proc/acpi/battery/BAT0 SYS=/sys/class/power_supply/BAT0/uevent STATE= # dc: design capacity, rc: remaining capacity if [ -f $PROC/info ] then STATE=$PROC/state # 2.6.24 dc=$(awk '/last full/ { print $4 }' $PROC/info) rc=$(awk '/remaining/ { print $3 }' $PROC/state) elif [ -f $SYS ] then STATE=$SYS # 2.6.25 dc=$(awk -F= '$1 ~ /^POWER_SUPPLY_CHARGE_FULL$/ { print $2 }' $SYS) rc=$(awk -F= '$1 ~ /^POWER_SUPPLY_CHARGE_NOW$/ { print $2 }' $SYS) else return 0 fi p=$(echo 3k $rc $dc / 100 \* p | dc ) if grep -iq discharging $STATE; then printf " %02d" "$p" else if [ ${p%.*} -lt 100 ]; then printf " %02d+" "$p" fi fi } bat
Just found that there is also a nice tool, called acpi...which makes
it even more easy:
% acpi -V Battery 0: Full, 100% AC Adapter 0: on-line Thermal 0: ok, 53.0 degrees C Cooling 0: Processor 0 of 7
