James B. Byrne ha scritto:

I have a little niggling situation that I would like to resolve programmatically. I use Git as my SCM and I have release branches which are sometimes patched. I find myself sometimes entering the working directory tree forgetting that I was last on a release branch and not on the master.

What I would like to do is to have a script run every time that I enter a directory, check for .git, and if it finds it then simply do a git-branch for me so that which I am on is forcefully pointed out to me before I proceed to do something foolish.

All I can come up with from searching wrt cd is details on why one cannot change the working directory of a running script and various kluges around this. I do not wish to change the pwd of the shell, I just want some way of testing for a certain file and running a specific command if it is found when I enter a working tree. If this requires testing every directory that I cd to then I can live with that. If instead one can put a script that runs only when one enters certain directories then I can live with that as well.

Is there any way to do this?

I did a simple test: cd /tmp touch .git export PROMPT_COMMAND='echo -ne "\033]0;${USER}@${HOSTNAME%%.*}:${PWD/#$HOME/~}"; echo -ne "\007"; if [ -f .git ] ; then echo WARNING: .git DIRECTORY ; fi '

and now every time I cd on that directory and every time I issue a command (on that directory) I get the warning. Of course you can do something more elegant (for example change the color of the whole prompt...) Don't know the impact on performance...

hope this helps.

-- Regards Lorenzo

James B. Byrne wrote:

I have a little niggling situation that I would like to resolve programmatically. I use Git as my SCM and I have release branches which are sometimes patched. I find myself sometimes entering the working directory tree forgetting that I was last on a release branch and not on the master.

What I would like to do is to have a script run every time that I enter a directory, check for .git, and if it finds it then simply do a git-branch for me so that which I am on is forcefully pointed out to me before I proceed to do something foolish.

All I can come up with from searching wrt cd is details on why one cannot change the working directory of a running script and various kluges around this. I do not wish to change the pwd of the shell, I just want some way of testing for a certain file and running a specific command if it is found when I enter a working tree. If this requires testing every directory that I cd to then I can live with that. If instead one can put a script that runs only when one enters certain directories then I can live with that as well.

Is there any way to do this?

If you are talking about the command line, a shell function replacement for cd might work.

cd() { builtin cd $@ pwd # replace with your commands... }

You could put this in your .bashrc or export (-f) it from .bash_profile so subshells get it. I generally don't like surprises, so I'd probably name the funtion cdg or something else and use that when I wanted the special behavior.