Bash: check if the current directory is a Git Repository

Question

I have a color schema for my XFCE terminal and I try to set the branch name and color when I'm inside a directory which is a Git Repository .

Actually this is the configuration of my bash:

PS1="\u@\h $(if [[ ${EUID} == 0 ]]; then echo '\W'; else echo '\w'; fi) \$([[ \$? := 0 ]] && echo \":( \")\$ "

and when I'm inside a directory which is a Git Repository I want to show that:

[\u@\h \W]\[\033[00;32m\]\$(git_branch)\[\033[00m\]\$

this is the git_branch function :

git_branch() { git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/(\1)/' }

I tried to edit the PS1 as that:

\$(if [[git rev-parse --is-inside-work-tree]]; then [\u@\h \W]\[\033[00;32m\]\$(git_branch)\[\033[00m\]\$

but it isn't working - when I'm inside the directory of Git repository, it doesn't show me the name of the branch.

Thank you very much!

Answer 1

To check if the directory is under git control, you can source the following snippet:

# mygitprompt.sh
PROMPT_COMMAND="CheckIfGitDir"

CheckIfGitDir()
{
    if git status &>/dev/null; then
        echo "Directory is under the control of git"
    else
        echo "There is no sign of git anywhere"
    fi
}

How to source:

source /path/to/mygitprompt.sh

Everytime you hit ENTER, the command in PROMPT_COMMAND will be executed.