{ pkgs, ... }:

{
  programs.bash = {
    enable = true;
    enableCompletion = false;
    initExtra = ''
if [[ ! -v BASH_COMPLETION_VERSINFO ]] &&
   [[ -f "${pkgs.bash-completion}/etc/profile.d/bash_completion.sh" ]]; then
   source "${pkgs.bash-completion}/etc/profile.d/bash_completion.sh"
fi

[ "$DISPLAY" ] && xset r rate 300 60

#-##################### user specific aliases and functions ######################
if [ -d ~/.bashrc.d ]; then
    for rc in ~/.bashrc.d/*; do
        bn=''${rc##*/}
        if [ -f "''$rc" ] && [ -r "''$rc" ] && [ ! "''${bn::1}" = '.' ]; then
            \. "''$rc"
        fi
    done
fi
unset rc bn

#-########################### shell settings & options ###########################
set -E
set -o pipefail

shopt -s nullglob dotglob globstar extglob
shopt -s autocd cdable_vars cdspell
shopt -s checkwinsize
shopt -s lastpipe
shopt -s inherit_errexit
shopt -s no_empty_cmd_completion
shopt -s histreedit
shopt -s lithist
shopt -u histverify
_have bash_abbr && shopt -u expand_aliases

#-############################### shell variables ################################
FIGNORE='.o'
# Warning
HISTCONTROL=ignoreboth:erasedups
HISTTIMEFORMAT='%y-%m-%d %H:%M:%S '
HISTSIZE=-1
HISTFILESIZE=-1
HISTFILE=''$HOME/.''${USER:-default}_bash_history

#-############################ environment variables #############################
export PYTHON_BASIC_REPL=1 # I'm good at readline so I'm gonna use readline whereever possible!
export LESS='-SRFX'
export PAGER='less' GIT_PAGER='less' MANPAGER='less' SYSTEMD_PAGER='less'
export BAT_PAGER='''
export EDITOR='vim' VISUAL='vim' FCEDIT='vim' SYSTEMD_EDITOR='vim'
export PATH

#-########################## generally useful functions ##########################
take () {
    : 'Idempotently create directory recursively and cd into it'
    local out
    out=''$(set -o pipefail && mkdir -vp "''$@" | tail -1) || return
    printf '%s\n' "''$out"
    eval "out=''${out#"mkdir: created directory "}"
    CDPATH= cd "''${out:-''${@: -1}}"
}

safe_ls () {
    command ls --color=always --quoting-style=shell-escape -lArth 2>/dev/null || \
    command ls --color=always -q -lArth 2>/dev/null || \
    command ls --color=always -lArth 2>/dev/null || \
    command ls --color -lArth 2>/dev/null || \
    command ls -lArth 2>/dev/null || \
    command ls -lArt 2>/dev/null || \
    command ls -lAr 2>/dev/null || \
    command ls -lar 2>/dev/null || \
    command ls -la 2>/dev/null || \
    command ls -l 2>/dev/null || \
    command ls -1 2>/dev/null || \
    command printf '%q\n' * 2>/dev/null || \
    command printf '%s\n' * 2>/dev/null
}

cd () {
    : 'Run cd; on success in a terminal, show the 4 newest entries (with a count of hidden ones)'

    builtin cd "''$@" || return
    [[ -t 1 ]] || return 0
    command -v ls &>/dev/null || return 0

    local -a lines
    mapfile -t lines < <(safe_ls)
    if (( ''${#lines[@]} > 10 )); then
        printf '\033[7m... %d more entries ...\033[27m\n' "$(( ''${#lines[@]} - 10 ))";
        printf '%s\n' "''${lines[@]: -9}"
    else
        printf '%s\n' "''${lines[@]}"
    fi
}

drop_caches () {
    : 'Drop pagecache, dentries and inodes'
    : 'https://unix.stackexchange.com/a/87909'
    echo 3 | sudo tee /proc/sys/vm/drop_caches >/dev/null
}

respawn_shell () {
    : 'Intelligently respawn shell'
    : 'pure posix sh without forking'
    if [ "''${BASH_VERSINFO-}" ] && command -v bash 1>/dev/null 2>&1; then
        if _is_login_shell; then
            exec bash -l
        else
            exec bash
        fi
        : 'TODO: Implement more detection mechanisms for various shells (zsh, etc.)'
    elif [ -x /proc/self/exe ]; then
        if _is_login_shell; then
            exec -l /proc/self/exe
        else
            exec /proc/self/exe
        fi
    elif command -v "''${0#-}" 1>/dev/null 2>&1; then
        : 'TODO: Make it work with shells that actually start with a dash (unlikely, but possible)'
        printf 'Warning: replacing current shell with unreliable ''$0, which is: %s\n' "''$0"
        if _is_login_shell; then
            exec -l "''${0#-}"
        else
            exec "''${0#-}"
        fi
    else
        printf 'Error: Don'\'''t know how to reliably replace this shell, not exec'\'''ing and not exiting\n'
        printf 'You might want to manually run `exec [-l] "''$SHELL"`, however, `''$SHELL` might not be the shell you are currently running'
        return 1
    fi
}

export_bashrc () {
    CDPATH= command cd ~/.bashrc.d/ || return
    : 'Not using an associative array because those are not sorted!'
    declare -ar plugins=(*)
    [[ ''${#plugins[@]} -eq 0 ]] || [[ ''${#plugins} -eq 1 && ''${plugins[0]} = '*' ]] && return
    local IFS=' '
    declare -Ai selected
    declare plugin
    for plugin in "''${plugins[@]}"; do
        case "''$plugin" in
            #-# Comment below case match if you don'\'''t want to have a pre-selection of plugins to export
            #-# Requires `shopt -s extglob`
            (+([0-9])-@(util|redact|prompt|docker-tools|funcs|init-and-complete|general-aliases|bash-abbr)) selected[''$plugin]=1 ;;
            (*) selected[''$plugin]=
        esac
    done
    declare -a plugins_with_selection
    while :; do
        local PS3='Which plugins do you want to export/not export (enter a single number)? '
        plugins_with_selection=()
        for plugin in "''${plugins[@]}"; do
            if [[ ''${selected[''$plugin]} -eq 0 ]]; then
                plugins_with_selection+=(''$'\033[31m'''$plugin''$'\033[m')
            else
                plugins_with_selection+=(''$'\033[32m'''$plugin''$'\033[m')
            fi
        done
        select plugin in ''$'\033[31mQUIT\033[m' ''$'\033[34mDONE\033[m' "''${plugins_with_selection[@]}"; do
            plugin=''${plugin#''$'\033[3'[0-7]m}
            plugin=''${plugin%''$'\033[m'}
            [[ -z ''$REPLY || ''$plugin = QUIT || ''$plugin = DONE ]] && break 2
            [[ -z ''$plugin ]] && { echo "Please enter a number (1-''$((''${#plugins[@]}+2)))."; continue; }
            selected[''$plugin]=1-''${selected[''$plugin]}
            break
        done
        [[ -z ''$REPLY || ''$plugin = QUIT || ''$plugin = DONE ]] && break
    done
    [[ -z ''$REPLY || ''$plugin = QUIT ]] && { echo "Aborting"; return; }
    declare -a exported_plugins=()
    for plugin in "''${!selected[@]}"; do
        if [[ ''${selected[''$plugin]} -eq 1 ]]; then
            exported_plugins+=(".bashrc.d/''$plugin")
        fi
    done
    command rm -vf "exported_bashrc.tar.gz"
    CDPATH= command cd - >/dev/null
    CDPATH= command cd ~
    as_base64=''$(command tar -cvhzf - ".bashrc" "''${exported_plugins[@]}" | base64 -w0)
    CDPATH= command cd - >/dev/null
    as_base64_wrapped=''$(printf %s "''$as_base64" | sed 's#.\{,70\}#'\'''&'\'''\\\n#g' | sed ''\'''$s#\\$##')
    command install -m775 /dev/stdin ~/bashrc_installer.sh <<-EOF
		#! /usr/bin/env bash

		set -e

		[ "\''$BASH_VERSINFO" ] && command -v declare >/dev/null 2>&1 && command declare -p BASH_VERSINFO | { IFS=' ' read -r _ flags _; case "\''$flags" in (*r*) ;; (*) false; esac; } || { printf 'This installer must be run with bash!\\n'; exit 1; }
		command -v bash >/dev/null 2>&1 || { printf 'bash must be installed!\\n'; exit 2; }

		as_base64=''$as_base64_wrapped
		tempdir=\''$(mktemp -d)
		trap 'rm -rf -- "\''$tempdir"' EXIT
		cd -- "\''$tempdir"
		base64 -d <<< "\''$as_base64" | tar xzf -
		create_dir_and_move () {
		    src=\''$1
		    dst=\''$2
		    [ ! -f "\''$src" ] && { printf '%s\\n' "Source argument '\''$src' is not a regular file"; return 1; }
		    dst_dir=\''$(dirname -- "\''${dst//[^!-~]/-}")
		    [ ! -d "\''$dst_dir" ] && { printf '%s\\n' "Trying to create destination directory '\''$dst_dir'"; mkdir -p -- "\''$dst_dir"; } || :
		    [ -d "\''$dst_dir" ] && mv -v -t "\''$dst_dir" -- "\''$src" || :
		}
		ask_overwrite () {
		    file1=\''$1
		    file2=\''$2
		    if [[ ! -e \''$file2 ]]; then
		        create_dir_and_move "\''$file1" "\''$file2"
		    elif [[ -d \''$file2 ]]; then
		        printf 'WARNING: Destination file %s is a directory! Skipping this file\\n' "\''${file2@Q}"
		        return
		    elif [[ ! -f \''$file2 ]]; then
		        printf 'WARNING: Destination file %s is not a regular file! Skipping this file\\n' "\''${file2@Q}"
		        return
		    elif ! diff -q "\''$file1" "\''$file2"; then
		        printf 'File to be installed (%s) differs from already installed file (%s)\\n' "\''${file1@Q}" "\''${file2@Q}"
		        read -p 'Press enter to show diff. ' || :
		        diff --color -u "\''$file1" "\''$file2" || :
		        printf 'Giving you a plain bash shell to resolve the situation. Once done, just exit.\\n'
		        printf 'After you exit, the destination file WILL BE FORCEFULLY OVERWRITTEN!!!\n'
		        read -p 'Press enter to continue in the shell. ' || :
		        bash --rcfile <(printf 'cd; printf "You are running bash version \''$BASH_VERSION. Your CWD is \''$PWD. Your HOME is \''$HOME. You are \''$USER and HOSTNAME is \''$HOSTNAME.\\nUse this bash shell to make changes, backups, etc.\\nThen just exit.\\n"') --noprofile || :
		        printf 'Destination file %s will be overwritten. Continue? ' "\''${file2@Q}"
		        read || :
		        create_dir_and_move "\''$file1" "\''$file2"
		    else
		        printf 'File %s was not changed\\n' "\''${file2@Q}"
		    fi
		}
		ask_overwrite .bashrc ~/.bashrc
		set +f
		shopt -s nullglob dotglob
		for file in .bashrc.d/*; do
		    ask_overwrite "\''$file" ~/"\''$file"
		done
		cd - >/dev/null
		read -p 'Self destruct (y/N)? ' choice || :
		[[ \''$choice = y ]] && { printf 'Trying to rm myself (%s)\\n' "\''${0@Q}"; rm -- "\''$0" && printf 'Success\\n' || printf 'Failed. Not trying further\\n'; }
	EOF
}

#-#################################### binds #####################################
bind '"\e\C-r": kill-region' \
     '"\C-x\C-k": kill-whole-line' \
     '"\e\C-p": history-search-backward' \
     '"\e\C-n": history-search-forward' \
     '"\eP": history-substring-search-backward' \
     '"\eN": history-substring-search-forward' \
     '"\C-x\C-d": "\e#\C-m exit\C-m"' \
     '"\ej": "\C-e |& tac | \\cat -n | tac | \\cat -n | less -SFXR\C-m"' \
     '"\eX": ">/dev/null "' \
     '"\t": menu-complete' \
     '"\e[Z": menu-complete-backward' \
     '"\C-x\C-r": forward-search-history' \
     'set show-all-if-ambiguous on' \
     'set completion-query-items 0' \
     'set menu-complete-display-prefix on' \
     'set colored-completion-prefix on' \
     'set colored-stats on' \
     'set history-preserve-point on'

#-################################## autoclear ###################################
#-# TODO

#-# prank () {
#-#     line_up_until_cursor=''${READLINE_LINE::READLINE_POINT}
#-#     line_after_cursor=''${READLINE_LINE:READLINE_POINT}
#-#     if [[ ''$((RANDOM % 5)) -eq 0 ]]; then
#-#         READLINE_LINE="''$line_up_until_cursor''$line_after_cursor"
#-#         #READLINE_LINE="''$line_up_until_cursor''${1^}''$line_after_cursor"
#-#         READLINE_POINT=''$((READLINE_POINT+1))
#-#     else
#-#         READLINE_LINE="''$line_up_until_cursor''$1''$line_after_cursor"
#-#         READLINE_POINT=''$((READLINE_POINT+1))
#-#     fi
#-# }
#-# bind -x '" ": prank " "'
#-# bind -x '"a": prank "a"'
    '';
  };
}