Git prompt…

I was thinking about how to synchronize my home dirs and ended up having them now under revision control with git.

The blog post Don’t Reinvent the Wheel describes how to make use of the git provided script git-sh-prompt and replace the default PS1 with a PROMPT_COMMAND.

Cleaned and updated the default Debian .bashrc to use PROMPT_COMMAND when git-sh-prompt is installed or fall back to the default Debian PS1.

I don’t set the environment variable GIT_PS1_SHOWUNTRACKEDFILES=1 for $HOME as there are many untracked files but i wanted it for other repositories.
Added a function gituntracked that sets GIT_PS1_SHOWUNTRACKEDFILES=1 based on current directory and added the function to PROMPT_COMMAND.

On OmniOS the git pkg doesn’t install git-sh-prompt, i copied it from some other machine to /opt/gitprompt/git-sh-prompt.
The path to git-sh-prompt is found and stored in the variable __gitprompt which then is sourced.

# check for git-sh-prompt. Doesn't get installed with the OmniOS git package, copied to
# /opt/gitprompt
if [ -f /usr/lib/git-core/git-sh-prompt ]; then
    __gitprompt="/usr/lib/git-core/git-sh-prompt"
  elif [ -f /opt/gitprompt/git-sh-prompt ]; then
    __gitprompt="/opt/gitprompt/git-sh-prompt"
  else
    __gitprompt=""
fi

# enable git prompt when git-sh-prompt is found or fallback to default PS1
if [[ -f "${__gitprompt}" ]]; then
    source "${__gitprompt}"

    # home dir function, change path for $HOME to ~; used to set terminal titlebar
    function get_dir {
        printf "%s" $(pwd | sed "s:$HOME:~:")
    }

    # set terminal window titlebar
    function set_titlebar {
        case "$TERM" in
        xterm*|rxvt*)
            printf "\033]0;%s\007" "$*"
            ;;
        esac
    }

    ## git variables for use with git-sh-prompt
    # show git untracked files for repos outside $HOME
    function gituntracked {
        if ! [[ $(pwd) =~ ${HOME} ]]; then
            export GIT_PS1_SHOWUNTRACKEDFILES=1
        else
            unset GIT_PS1_SHOWUNTRACKEDFILES
        fi
    }
    # show git repo status in prompt
    export GIT_PS1_SHOWDIRTYSTATE=1
    export GIT_PS1_SHOWCOLORHINTS=1
    export GIT_PS1_SHOWSTASHSTATE=1
    export GIT_PS1_SHOWUPSTREAM="verbose git"

    # set PROMPT_COMMAND instead of PS1 so git can use colors in prompt
    PROMPT_COMMAND='gituntracked; \
        __git_ps1 "\[\033[01;33m\]\u@\h\[\033[00m\]:\[\033[01;37m\]\w\[\033[00m\]" "\\\$ "; \
        set_titlebar "$USER@${HOSTNAME%%.*}: $(get_dir)"'
else
    # when no git installed set prompt and window title
    PS1='\[\033[01;33m\]\u@\h\[\033[00m\]:\[\033[01;37m\]\w\[\033[00m\]\$ '

    # If this is an xterm set the title to user@host:dir
    case "$TERM" in
    xterm*|rxvt*)
        PS1="\[\e]0;\u@\h: \w\a\]$PS1"
        ;;
    *)
        ;;
    esac
fi

# export git commiter email address with plused hostname detail.
# ${HOSTNAME} is already set on Linux and OmniOS
export GIT_COMMITTER_EMAIL="username+${HOSTNAME}@domain.tld"

[update 2016-10-08]
– add function to show untracked files in repositories outside $HOME directory
– make git-sh-prompt work on OmniOS where it’s not installed with the package