non-random ramble » bash

Current git branch and git autocompletion in bash

Jim Barritt — Wed, 26 Jan 2011 11:46:09 +0000

First put the following script somewhere, like ~/git_completion.sh and chmod +x it.

Then add this line to your ~/.bash_profile:

. ~/git_completion.sh

Finally, if you want to pretty up your prompt as above, then add this:

export PS1=’\h:\W \[\e[1;32m\]$(__git_ps1 “[%s]“)\[\e[0m\] > ‘

You can also install git from http://code.google.com/p/git-osx-installer/ (Thanks Jon)

Or on ubuntu install a package called “git-completion” (Thanks Juan)

A proper shell in windows

Jim Barritt — Wed, 27 Oct 2010 11:05:12 +0000

Thanks to a posting on our mailing list I am trying out mintty, a tty shell emulator for windows which runs on top of cygwin.

So far so good, feels like the real deal.

You can install it by running “setup.exe” in the cygwin folder and install it from the package list under “shells”.

I added a couple of lines to my ~/.bash_profile

export PS1="\W> "
alias clear='echo -e "\033c"'

As there didn’t seem to be a default “clear” command to clear the terminal. Got the trick from here. Also good is The tips and tricks page

To get a nice “Bash prompt here” you can install the chere package from the cygwin setup (same as above) and then run:

chere -i -c -t mintty -s bash

One oddity I’ve found is that if you execute a batch file which uses CMD.exe, CTRL+C doesn’t seem to work. It breaks out of the program but then output still appears! So you need to run .sh files in there.

Colorised Build Success Message

Jim Barritt — Sun, 25 Apr 2010 18:05:16 +0000

My current project has a neat trick we picked up where the build has a red or green banner at the end when you run it locally to give good feedback about the build status. I’m not sure who originated it, but thanks!

I just had to tweak it a bit to get it working on OS X so I thought I would document the trick here.

run.sh - OS X

CMD=”./tools/ant/bin/ant -lib ./asl/lib/jdepend $@”
echo “Running command [${CMD}] …”
$CMD
if [ "$?" -ne 0 ]; then
    echo -e “`tput setab 1`  `cat ./ci/failed.txt` `tput setab 0`”
    exit 1
else
    echo -e “`tput setab 2`  `cat ./ci/passed.txt`  `tput setab 0`”
    exit 0
fi

This assumes you have two supporting files ./ci/passed.txt and ./ci/failed.txt which contain the message. You can generate messages to your taste here.

I have provided the files in this example here :

passed.txt

failed.txt

It has also been run under Ubuntu where the following works (it didnt work on OS X which is why I adapted it), but the tput should also work on Ubuntu. I’ve not explicitly tested this one!

if [ "$?" -ne 0 ]; then
    echo -e “\E[30;41m"
    cat ./ci/failed.txt
    echo -e "\E[0m"
    exit 1
else
    echo -e "\E[30;42m"
    cat ./ci/passed.txt
    echo -e "\E[0m"
    exit 0
fi

Under windows you can actually make the entire screen of the terminal change color:

run.bat - WINDOWS

CALL tools\ant\bin\ant %*
IF ERRORLEVEL 1 GOTO RedBuild
IF ERRORLEVEL 0 GOTO GreenBuild
:RedBuild
color 4F
GOTO TheEnd
:GreenBuild
color 2F
:TheEnd
PAUSE
color 07

Check if an command was successful in bash

Jim Barritt — Thu, 03 Sep 2009 17:21:03 +0000

When scripting gigantic build scripts with bash, its important that if anything fails you halt the script.

Heres how:

function checkResult() {
	RESULT=$1
	if [ $RESULT -ne 0 ] ; then
		echo
		echo "!!!!!!!!!!!  Build Failed !!!!!!!!!!!!!!!!!"
		echo
		exit $RESULT
	fi
}

You call it like this:

./someCommandOrScript.sh
checkResult $?

Edit GMail messages using Vim

Jim Barritt — Thu, 20 Nov 2008 13:45:29 +0000

Ok, why would you want to do this ?

Because you can.

1) Install this add-on which allows you to edit text areas in firefox using an external editor:

https://addons.mozilla.org/en-US/firefox/addon/4125

2) Install VIM

ftp://ftp.vim.org/pub/vim/pc/gvim72.exe

3) Setup the plugin to use vim (addOns->its all text addon->options)

4) make sure gmail is using “plain text” as editing – otherwise its not a text area, but some mad iframe.

6) Happy Days!

Read in a list of files and loop over them in bash

Jim Barritt — Sat, 08 Nov 2008 12:10:09 +0000

Needed to do this and after a bit of looking around (Bash scripting) came up with this:


#!/bin/bash

FILE_LIST_SOURCE=listoffiles.txt
DEFAULT_FILE="some.default.file"

[ -f $FILE_LIST_SOURCE ] && LIST_OF_FILES=$(cat $FILE_LIST_SOURCE)

LIST_OF_FILES=${LIST_OF_FILES:-$DEFAULT_FILE}

#echo -e "\\nLIST_OF_FILES:\\n$LIST_OF_FILES"

echo "List of files:"
for i in $LIST_OF_FILES; do
    echo $i
done

Python!

Jim Barritt — Tue, 04 Dec 2007 13:36:21 +0000

Wanted to find all files which contained a specific string and then extract a part of the line we were interested in.

First the GREP:

grep -R --include=*.vm  * > results.txt

then run this python script:

import re
for line in open('editablecomponents.txt'):
	match = re.search(r'#editableComponent\("(.*?)"', line)
	if match:
		print match.group(1) + "Display.vm"

Sweet Search And Highlight Command

Jim Barritt — Sat, 14 Jul 2007 17:40:49 +0000

Been doing quite a bit of manipulating LaTeX files on the command line recently, and have a very sweet little command for searching for text in multiple files:

grep -r Hoffman */*.tex | less +/Hoffman

Where “Hoffman” is the search term which can of course be any regular expression.

The “less” command has a very convenient argument “+” which allows you to pass a search term in and will automatically highlight it for you.

The -r in grep recurses directories and */*.tex looks for all tex files. the | pipes the result to less.

sweet.