#!/usr/bin/env bash
#
# ~/.bashrc.root - root bash startup
#
# (C) Bruno Raoult ("br"), 2001-2024
# Licensed under the GNU General Public License v3.0 or later.
# Some rights reserved. See COPYING.
#
# You should have received a copy of the GNU General Public License along with this
# program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
#
# SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
#
# Usage: to be invoked from .bashrc.
# i.e., add at the end of .bashrc:
# [ -f "$HOME/.bashrc.$USER" ] && . "$HOME/.bashrc.$USER"
#
# Debian default ~/.profile usually does:
#   1) source .bashrc if it exists
#   2) add "$HOME"/bin in PATH
# This imply a duplicate "$HOME/bin" in PATH, as we do everything here.
# Better to have a ~/.bash_profile with the lines above.

# _var_del() - remove an element from a colon-separated list.
# $1: name (reference) of a colon separated list
# $2: element to remove (string)
#
# _var_del() removes every occurrence of $2, if there are more than 1,
# and leaves $1 unchanged if $2 is not present.
#
# Example:
# With VAR's value being "foo:bar:quax:bar". Using "_var_del VAR bar" will
# leave VAR with the value "foo:quax".
_var_del() {
    local -n _p_del=$1
    local _l=":$_p_del:"

    while [[ $_l =~ :$2: ]]; do
          _l=${_l//:$2:/:}
    done
    _l=${_l%:}
    _l=${_l#:}
    _p_del="$_l"
}

# _var_prepend() - prepend element to colon-separated variable.
# $1: variable name (reference)
# $2: element to add (string)
#
# Any occurrence of $2 in $1 is first removed, then $2 is added at $1 beginning.
#
# Example:
# With VAR's value being "foo:bar:quax:bar". Using "_var_prepend VAR bar"
# will leave VAR with the value "bar:foo:quax".
_var_prepend() {
    local -n _p_prepend=$1

    _var_del _p_prepend "$2"
    [[ -z $_p_prepend ]] && _p_prepend="$2" && return
    _p_prepend="$2:$_p_prepend"
}

# _var_append() - append element to colon-separated variable.
# $1: variable name (reference)
# $2: element to add (string)
#
# Any occurrence of $2 in $1 is first removed, then $2 is added at $1 end.
#
# Example:
# With VAR's value being "foo:bar:quax:bar". Using "_var_append VAR bar"
# will leave VAR with the value "foo:quax:bar".
_var_append() {
    local -n _p_append=$1

    _var_del _p_append "$2"
    [[ -z $_p_append ]] && _p_append="$2" && return
    _p_append="$_p_append:$2"
}

# adjust PATH. Below paths will be added at beginning.
_lpath=("$HOME/bin/$(uname -s)-$(uname -m)"
        "$HOME/bin"
        "/usr/local/bin")

# loop array in reverse order. Note: We do not test for path existence and add it
# unconditionally, to avoid automounter interference.
for (( _i = ${#_lpath[@]} - 1; _i >= 0; --_i )); do
    _var_prepend PATH "${_lpath[_i]}"
done
unset _lpath

# enable core file
ulimit -HSc 102400              # in 1024 bytes - Really cannot use KiB :-)

# ... and set PAGER to less (for man(1) and others)
if hash less 2>/dev/null; then
    export PAGER=less
    # do not clear screen after "less", exit immediately if one page only
    export LESS="-XFB"
    # ... and just alias more... to less ;-)
    alias more=less
fi

# no output split for dc and bc / make bc silent
export DC_LINE_LENGTH=0
export BC_LINE_LENGTH=0
export BC_ENV_ARGS=--quiet

# both ubuntu and debian assume we want colors if TERM contains "color"
# this is surely not true, as TERM is often forced by terminal emulator
# shellcheck disable=SC2154
PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w\$ '
case "$TERM" in
    xterm*|rxvt*)
        PS1="\[\e]0;${debian_chroot:+($debian_chroot)}\u@\h: \w\a\]$PS1"
        ;;
    *)
        ;;
esac

# trim prompt path
export PROMPT_DIRTRIM=3

# find a suitable editor
e() {
    $VISUAL "$@"
}
export -f e

# no Emacs for root
# emacs clones, then vim/vi, then... whatever left.
_VISUALS=(zile mg jed vim vi nano ed)
for e in "${_VISUALS[@]}"; do
    if hash "$e" 2>/dev/null; then
        export VISUAL="$e"
        break
    fi
done
unset _VISUALS
export EDITOR=$VISUAL

# append to the history file, don't overwrite it
shopt -s histappend
# write history after each command
export PROMPT_COMMAND="history -a"
# Add timestamp in history
export HISTTIMEFORMAT="%d/%m %H:%M "
# ignore history dups, delete all previous dups
export HISTCONTROL="ignorespace:ignoredups:erasedups"
# ignore these in history
export HISTIGNORE="history *:h:hl:hll:hlll"
# history size
HISTSIZE=5000
HISTFILESIZE=5000

# remove new stupid Debian "ls" quoting, and colors...
# Many complains, one of them:
#    https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=813164#226
export QUOTING_STYLE=literal
[[ -v BASH_ALIASES[ls] ]] && unalias ls

# aliases/functions for ls and history
alias l='ls -F'
alias ls='ls -F'
alias l1='ls -1F'
alias la='ls -AF'
alias ll='ls -lF'
alias lla='ls -lAF'
alias ldl='ls -l | grep ^d'
[[ -v BASH_ALIASES[lrt] ]] && unalias lrt
lrt() {
    local -i _l=20
    if (( $# > 0 )) && [[ $1 =~ [[:digit:]]+ ]]; then
        _l="$1"
        shift
    fi
    # shellcheck disable=2012
    ls -lrt "${1:-.}" | tail -"$_l"
}
[[ -v BASH_ALIASES[lart] ]] && unalias lart
lart() {
    local -i _l=20
    if (( $# > 0 )) && [[ $1 =~ [[:digit:]]+ ]]; then
        _l="$1"
        shift
    fi
    # shellcheck disable=2012
    ls -laFrt "${1:-.}" | tail -"$_l"
}

alias h="history   10"                            # short
alias hl="history  25"                            # long
alias hll="history 100"                           # very long
alias hlll="history"                              # all history

alias grep='grep --color=auto'                    # add colors to grep
alias fgrep='fgrep --color=auto'
alias egrep='egrep --color=auto'

# misc aliases
alias fuck='sudo $(history -p \!\!)'
alias diff='diff -u'

# Indent style for emacs
# Local Variables:
# mode: shell-script
# sh-basic-offset: 4
# sh-indentation: 4
# indent-tabs-mode: nil
# comment-column: 32
# End: