scripts/env_tools/git_prompt.bash

#!/bin/bash
###############################################################################
# IDENTIFICATION OF LOCAL HOST: CHANGE TO YOUR COMPUTER NAME
###############################################################################


PRIMARYHOST="localhost"

###############################################################################
# PROMPT
###############################################################################

###############################################################################
# Terminal Title

set_terminal_title() {
    if [[ -z $@ ]]
    then
        TERMINAL_TITLE=$(pwd -P)
    else
        TERMINAL_TITLE=$@
    fi
}
alias stt='set_terminal_title'
alarm()  { perl -e 'alarm shift; exec @ARGV' "$@"; }

STANDARD_PROMPT_COMMAND='history -a ; echo -ne "\033]0;${TERMINAL_TITLE}\007"'
PROMPT_COMMAND=$STANDARD_PROMPT_COMMAND

###############################################################################
# Parses Git info for prompt

function _set_git_envar_info {
    GIT_BRANCH=""
    GIT_HEAD=""
    GIT_STATE=""
    GIT_LEADER=""
    GIT_ROOT=""
    GIT_REPO=""
    GIT_ACTION=""

    if [[ $(which git 2>/dev/null) ]]
    then

        local IS_GIT
	IS_GIT=$(\git rev-parse --show-toplevel 2>/dev/null)
        if [[ -z $IS_GIT ]]
        then
            return
        fi

        GIT_ROOT=./$(\git rev-parse --show-cdup 2>/dev/null)
	GIT_GIT=$(\git rev-parse --git-dir 2>/dev/null)

        local STATUS
        # STATUS=$(\git status 2>/dev/null)
	STATUS=$(alarm 3 \git status 2>/dev/null)
        if [[ -z $STATUS ]]
        then
            STATUS="alarmed"
        fi

        GIT_LEADER=":"
        GIT_BRANCH="$(\git branch --no-color 2>/dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/\1/')"
        GIT_HEAD=":$(\git log -n1 --pretty=format:%h 2>/dev/null)"
        GIT_REPO="$(\git rev-parse --show-toplevel 2>/dev/null | awk -F/ '{print $NF}')"

        if [[ "$STATUS" == *'working directory clean'* ]]
        then
            GIT_STATE=""
        else
            GIT_HEAD=$GIT_HEAD":"
            GIT_STATE=""
            if [[ "$STATUS" == *'Changes to be committed:'* ]]
            then
                GIT_STATE=$GIT_STATE'+I' # Index has files staged for commit
            fi
            if [[ "$STATUS" == *'Changed but not updated:'* || "$STATUS" == *'Changes not staged for commit'* ]]
            then
                GIT_STATE=$GIT_STATE"+M" # Working tree has files modified but unstaged
            fi
            if [[ "$STATUS" == *'Untracked files:'* ]]
            then
                GIT_STATE=$GIT_STATE'+U' # Working tree has untracked files
            fi
            if [[ "$STATUS" == *'alarmed'* ]]
            then
                GIT_STATE=$GIT_STATE'*' # too much time to proceed status
            fi
            GIT_STATE=$GIT_STATE''
        fi

        if [ -f "$GIT_GIT/rebase-merge/interactive" ]; then
            GIT_ACTION="REBASE-i"
        elif [ -d "$GIT_GIT/rebase-merge" ]; then
            GIT_ACTION="REBASE-m"
        else
            if [ -d "$GIT_GIT/rebase-apply" ]; then
                if [ -f "$GIT_GIT/rebase-apply/rebasing" ]; then
                    GIT_ACTION="REBASE"
                elif [ -f "$GIT_GIT/rebase-apply/applying" ]; then
                    GIT_ACTION="AM"
                else
                    GIT_ACTION="AM/REBASE"
                fi
            elif [ -f "$GIT_GIT/MERGE_HEAD" ]; then
                GIT_ACTION="MERGING"
            elif [ -f "$GIT_GIT/BISECT_LOG" ]; then
                GIT_ACTION="BISECTING"
            fi
	fi

	if [ ! -z "$GIT_ACTION" ]; then
	    GIT_ACTION="|"$GIT_ACTION
	fi

    fi

}

###############################################################################
# Composes prompt.
function setps1 {

    # Help message.
#    local USAGE="Usage: setps1 [none] [screen=<0|1>] [user=<0|1>] [dir=<0|1|2>] [git=<0|1>] [wrap=<0|1>] [which-python=<0|1>]"

    if [[ (-z $@) || ($@ == "*-h*") || ($@ == "*--h*") ]]
    then
        echo $USAGE
        return
    fi

    # Prompt colors.
    local CLEAR="\[\033[0m\]"
    local STY_COLOR='\[\033[1;37;41m\]'
    local PROMPT_COLOR='\[\033[1;94m\]'
    local USER_HOST_COLOR='\[\033[1;30m\]'
    local PROMPT_DIR_COLOR='\[\033[1;94m\]'
    local GIT_LEADER_COLOR='\[\033[1;30m\]'
    local GIT_BRANCH_COLOR=$CLEAR'\[\033[1;90m\]\[\033[4;90m\]'
    local GIT_HEAD_COLOR=$CLEAR'\[\033[1;32m\]'
    local GIT_STATE_COLOR=$CLEAR'\[\033[1;31m\]'

    # Hostname-based colors in prompt.
    if [[ $HOSTNAME != $PRIMARYHOST ]]
    then
        USER_HOST_COLOR=$REMOTE_USER_HOST_COLOR
    fi

    # Start with empty prompt.
    local PROMPTSTR=""

    # Set screen session id.
    if [[ $@ == *screen=1* ]]
    then
        ## Decorate prompt with indication of screen session ##
        if [[ -z "$STY" ]] # if screen session variable is not defined
        then
            local SCRTAG=""
        else
            local SCRTAG="$STY_COLOR(STY ${STY%%.*})$CLEAR" # get screen session number
        fi
    fi

    # Set user@host.
    # if [[ $@ == *user=1* ]]
    # then
    #      PROMPTSTR=$PROMPTSTR"$USER_HOST_COLOR\\u@\\h$CLEAR"
    # fi

    # Set directory.
    if [[ -n $PROMPTSTR && ($@ == *dir=1* || $@ == *dir=2*) ]]
    then
            PROMPTSTR=$PROMPTSTR"$PROMPT_COLOR:"
    fi

    if [[ $@ == *dir=1* ]]
    then
        #PROMPTSTR=$PROMPTSTR"$PROMPT_DIR_COLOR\W$CLEAR"
        PROMPTSTR=$PROMPTSTR"$PROMPT_DIR_COLOR\$GIT_REPO$CLEAR"
    elif [[ $@ == *dir=2* ]]
    then
        PROMPTSTR=$PROMPTSTR"$PROMPT_DIR_COLOR\$(pwd -P)$CLEAR"
    fi

#     if [[ $@ == *dir=1* ]]
#     then
#         PROMPTSTR=$PROMPTSTR"$PROMPT_DIR_COLOR\W$CLEAR"
#     elif [[ $@ == *dir=2* ]]
#     then
#         PROMPTSTR=$PROMPTSTR"$PROMPT_DIR_COLOR\w$CLEAR"
#     fi
#
    # Set git.
    if [[ $@ == *git=1* ]]
    then
        PROMPT_COMMAND="$STANDARD_PROMPT_COMMAND && _set_git_envar_info"
        PROMPTSTR=$PROMPTSTR"$BG_COLOR$GIT_LEADER_COLOR\$GIT_LEADER$GIT_BRANCH_COLOR"
        PROMPTSTR=$PROMPTSTR"\$GIT_BRANCH$GIT_HEAD_COLOR\$GIT_HEAD$GIT_STATE_COLOR\$GIT_STATE\$GIT_ACTION$CLEAR"
    else
        PROMPT_COMMAND=$STANDARD_PROMPT_COMMAND
    fi

    # Set wrap.
    if [[ $@ == *wrap=1* ]]
    then
        local WRAP="$CLEAR\n"
    else
        local WRAP=""
    fi

    # Set wrap.
    if [[ $@ == *which-python=1* ]]
    then
        local WHICHPYTHON="$CLEAR\n(python is '\$(which python)')$CLEAR\n"
    else
        local WHICHPYTHON=""
    fi

    # Finalize.
    if [[ -z $PROMPTSTR || $@ == none ]]
    then
        PROMPTSTR="\$ "
    else
        PROMPTSTR="$TITLEBAR\n$SCRTAG${PROMPT_COLOR}[$CLEAR$PROMPTSTR$PROMPT_COLOR]$WRAP$WHICHPYTHON$PROMPT_COLOR\$$CLEAR "
    fi

    # Set.
    PS1="\[\e]0;\w\a\]\n\[\e[32m\]\u@\h \[\e[33m\]\w\[\e[0m\]$PROMPTSTR"
    PS2='> '
    PS4='+ '
}

alias setps1-long='setps1 screen=1 user=1 dir=2 git=1 wrap=1'
alias setps1-short='setps1 screen=1 user=1 dir=1 git=1 wrap=0'
alias setps1-default='setps1-short'
alias setps1-plain='setps1 screen=0 user=0 dir=0 git=0 wrap=0'
alias setps1-nogit='setps1 screen=0 user=1 dir=1 git=0 wrap=0'
alias setps1-local-long='setps1 screen=1 user=0 dir=2 git=1 wrap=1'
alias setps1-local-short='setps1 screen=0 user=0 dir=1 git=1 wrap=0'
alias setps1-local='setps1-local-short'
alias setps1-dev-short='setps1 screen=0 user=0 dir=1 git=1 wrap=0 which-python=1'
alias setps1-dev-long='setps1 screen=0 user=1 dir=2 git=1 wrap=0 which-python=1'
alias setps1-dev-remote='setps1 screen=0 user=1 dir=1 git=1 wrap=0 which-python=1'
if [[ "$HOSTNAME" = "$PRIMARYHOST" ]]
then
    setps1 screen=0 user=0 dir=1 git=1 wrap=0 which-python=0
else
    setps1 screen=1 user=1 dir=1 git=1 wrap=0 which-python=0
fi