mydots/dotfiles/bash/post.bashrc

#!/bin/bash

######################################################
### things to do AFTER host/user-specific settings ###
######################################################

#shellcheck disable=2120
__bashum__lastrv() {
    local rvfile        # path to return value cache file
    local lastrv        # actual last return value
    local do_rm         # true if we should remove the cache
    rvfile="$RV_TMP/$$.lastrv"
    lastrv="$(cat "$rvfile")"
    do_rm=false
    test "$1" == "-r" && do_rm=true
    if [ "0$lastrv" -gt 0 ];
    then
        echo "!$lastrv!"
    else
        echo ""
    fi
    $do_rm && rm -f "$rvfile"
}

__bashum__save_rv() {
    local rvfile="$RV_TMP/$$.lastrv"
    [ -w "${rvfile%/*}" ] && echo "$1" > "$rvfile"
}

__bashum__task_context() {
    $BASHUM_TASK_CTX || return 0
    local ctx       # TaskWarrior context
    type -t task >/dev/null || return 1
    ctx=$(task _get rc.context)
    test -n "$ctx" || return
    echo -n "|$ctx"
}

#shellcheck disable=SC2154 disable=2016
__bashum__mkps1() {
    # these functions must be already defined by ~/.bash/user/*.bashrc
    # and ~/.bash/host/*.bashrc
    test -n "$SSH_CONNECTION" \
     && echo -n "$(__bashum__mkps1user)"    # username only when on ssh
    echo -n "$lwhite@"                      # nice shiny at sign
    echo -n "$(__bashum__mkps1host)"        # hostname colored per host
    echo -n "$yellow"                       #\
    echo -n     '$(__bashum__task_context)' # > taskwarrior's context
    echo -n "$normal"                       #/
    echo -n "$lwhite:"                      # nice shiny colon
    echo -n "$lblue\w$normal"               # current workdir
    echo -n "$green"                        #\
    echo -n     '$(__git_ps1 "(%s)")'       # > git's PS1
    echo -n "$normal"                       #/
    echo -n "$lred"                         #\
    echo -n     '$(__bashum__lastrv -r)'    # > last exit status (nothing if zero)
    echo -n "$normal"                       #/
    echo '$ '                               # obligatory dollar
}

#shellcheck disable=SC2154
__bashum__mkps2() {
    echo "$lwhite·$blue>$yellow>$white>$normal "
}

# and use to assemble own PS1
PS1=$(__bashum__mkps1)
PS2=$(__bashum__mkps2)


__bashum__set_title() {
    #
    # Show the currently running command in the terminal title:
    #
    # http://www.davidpashley.com/articles/xterm-titles-with-bash.html
    #
    case "$BASH_COMMAND" in
        *"\033]"0*)
            # The command is trying to set the title bar as well;
            # this is most likely the execution of $PROMPT_COMMAND.
            # In any case nested escapes confuse the terminal, so don't
            # output them.
            ;;
        "")
            echo -ne "\033]0;$(__bashum__mkicon) "
            echo -n    "$(__bashum__lastrv)$(__bashum__mkhostid)$(__bashum__wdir normal)\$"
            echo -ne "\007"
            ;;
        *)
            echo -ne "\033]0;$(__bashum__mkicon) "
            echo -n    "${BASH_COMMAND} ($(__bashum__mkhostid)$(__bashum__wdir normal))"
            echo -ne "\007"
            ;;
    esac
}

__bashum__wdir() {
    #
    # Create abbreviated form of workdir
    #
    local mode=${1:-normal}
    case $mode:$PWD in
        shrinky:*)              __bashum__shrinkypath "$PWD" ;;
        normal:*)               echo "${PWD/$HOME/\~}" ;;
        short:$HOME)            echo "~" ;;
        short:$HOME/??????????) echo "${PWD/$HOME/\~}" ;;
        short:$HOME/*/*)        echo "…${PWD##*/}" ;;
        short:$HOME/*)          echo "${PWD/$HOME/\~}" ;;
        short:*)                echo "$PWD" ;;
    esac
}

__bashum__shrinkypath() {
    #
    # Convert path $1 to small path
    #
    local path=$1
    case $path in
        $HOME)      echo "~"; return ;;
        $HOME/*)    echo -n "~"; __bashum__shrink_relpath "${path#$HOME/}" ;;
        *)          echo "$path"; return ;;
    esac
}

__bashum__shrink_relpath() {
    #
    # Shrink relative path according to rules
    #
    # Rules are:
    #
    #  * if path has 7 chars or less, it's left as is and printed;
    #  * else if there is only one element, it's left as is, and path is printed'
    #  * else if there are three or more elements, elements
    #    between first and last are replaced by '...',
    #  * if the first element has 3 chars or less, it's left as is
    #    and path is printed,
    #  * else, the first element is
    #      * broken into words by period,
    #      * and each word, if longer than 2 characters,
    #        is shortened to its first character followed by '...'
    #      * and the shortened elements are joined back by period,
    #  * finally the path is printed (first element shortened. '...', and
    #    last element intact)
    #
    local path=$1
    local elems
    local frst
    local last
    local elnum
    local elem
    test "${#path}" -le 7 && echo -n "$path" && return 0
    while IFS= read -r elem; do
        elems+=("$elem"); elnum=${#elems[@]}
    done <<<"$(sed 's|/|\n|' <<<"$path")"
    frst=${elems[0]}
    last=${elems[$((elnum-1))]}
    case $elnum in
        0) true ;;      # hardly possible (caught by -le 7 above)
        1) echo -n "$path"; return ;;
        2) __bashum__shrink_elem "$frst"; echo -n "/$last" ;;
        *) __bashum__shrink_elem "$frst"; echo -n "/…/$last" ;;
    esac
}

__bashum__shrink_elem() {
    #
    # Shrink element by words
    #
    local buff=$1
    local word
    local words
    local head=true
    words=(${buff//./ }); wnum=${#words[@]}
    test "$wnum" -eq 0 && echo -n "$buff" && return 0
    for word in "${words[@]}"; do
        $head || { echo -n .; head=false; }
        case $word in
            ?|??)   echo -n "$word" ;;
            *)      echo -n "${word:0:1}…" ;;
        esac
    done
}

#shellcheck disable=SC2016
__bashum__mkpc() {
    #
    # Compose PROMPT_COMMAND body
    #
    echo -n '__bashum__save_rv $?;'
    case "$TERM" in
        xterm*|rxvt*|screen*)
            echo -n 'echo -ne "\033]0;'
            echo -n   "$(__bashum__mkicon) "
            echo -n   '$(__bashum__lastrv)'
            echo -n   "$(__bashum__mkhostid)"
            echo -n   '$(__bashum__wdir shrinky)'
            echo -n   '\$'
            echo -n '\007"'
            ;;
    esac
}

__bashum__mkicon() {
    case "$SSH_CONNECTION" in
        "") echo  ;;
        *)  echo  ;;
    esac
}

__bashum__mkhostid() {
    test -n "$SSH_CONNECTION" || return
    echo "${HOSTNAME%%.*}:"
}

__bashum__setup_traps() {
    case "$TERM" in
        xterm*|rxvt*|screen*) trap __bashum__set_title DEBUG ;;
    esac
}

__bashum__setup_traps

PROMPT_COMMAND=$(__bashum__mkpc)

$BASHUM_BMO_NAG && bmo nag