#!/bin/bash
# shellcheck disable=SC1117,SC2001
#
# [X] open section
# [X] one shot mode
# [X] usage info
# [X] dependencies check
# [X] help
# [X] yank/y/copy/c
# [X] Y/C
# [X] eof problem
# [X] more
# [X] stealth mode
#
# here are several examples for the stealth mode:
#
# zip lists
# list permutation
# random list element
# reverse a list
# read json from file
# append string to a file
# run process in background
# count words in text counter
# group elements list

__CHTSH_VERSION=6
__CHTSH_DATETIME="2019-06-05 18:00:46 +0200"

# cht.sh configuration loading
#
# configuration is stored in ~/.cht.sh/ (can be overridden by CHTSH_HOME)
#
CHTSH_HOME=${CHTSH:-"$HOME"/.cht.sh}
[ -z "$CHTSH_CONF" ] && CHTSH_CONF=$CHTSH_HOME/cht.sh.conf
# shellcheck disable=SC1090,SC2002
[ -e "$CHTSH_CONF" ] && source "$CHTSH_CONF"
[ -z "$CHTSH_URL" ] && CHTSH_URL=https://cht.sh

# currently we support only two modes:
# * lite = access the server using curl
# * auto = try standalone usage first
CHTSH_MODE="$(cat "$CHTSH_HOME"/mode 2> /dev/null)"
[ "$CHTSH_MODE" != lite ] && CHTSH_MODE=auto
CHEATSH_INSTALLATION="$(cat "$CHTSH_HOME/standalone" 2> /dev/null)"


export LESSSECURE=1
STEALTH_MAX_SELECTION_LENGTH=5

case "$(uname -s)" in
	Darwin) is_macos=yes ;;
	*) is_macos=no ;;
esac

# for KSH93
# shellcheck disable=SC2034,SC2039,SC2168
if echo "$KSH_VERSION" | grep -q ' 93' && ! local foo 2>/dev/null; then
	alias local=typeset
fi

fatal()
{
	echo "ERROR: $*" >&2
	exit 1
}

_say_what_i_do()
{
	[ -n "$LOG" ] && echo "$(date '+[%Y-%m-%d %H:%M%S]') $*" >> "$LOG"

	local this_prompt="\033[0;1;4;32m>>\033[0m"
	printf "\n${this_prompt}%s\033[0m\n" " $* "
}

cheatsh_standalone_install()
{
	# the function installs cheat.sh with the upstream repositories
	# in the standalone mode
	local installdir; installdir="$1"
	local default_installdir="$HOME/.cheat.sh"

	if [ "$installdir" = help ]; then
		cat <<EOF
Install cheat.sh in the standalone mode.

After the installation, cheat.sh can be used locally, without accessing
the public cheat.sh service, or it can be used in the server mode,
where the newly installed server could be accessed by external clients
in the same fashion as the public cheat.sh server.

During the installation, cheat.sh code as well as the cheat.sh upstream
cheat sheets repositories will be fetched.

It takes approximately 1G of the disk space.

Default installation location:	~/.cheat.sh/
It can be overridden by a command line parameter to this script:

		${0##*/} --standalone-install DIR

See cheat.sh/:standalone or https://github.com/chubin/cheat.sh/README.md
for more information:

		cht.sh :standalone
		curl cheat.sh/:standalone

After the installation is finished, the cht.sh shell client is switched
to the auto mode, where it uses the local cheat.sh installation if possible.
You can switch the mode with the --mode switch:

		cht.sh --mode lite			# use https://cheat.sh/ only
		cht.sh --mode auto			# use local installation

For intallation and standalone usage, you need \`git\`, \`python\`,
and \`virtualenv\` to be installed locally.
EOF
		return
	fi

	local _exit_code=0

	local dependencies=(python git virtualenv)
	for dep in "${dependencies[@]}"; do
		command -v "$dep" >/dev/null || \
		{ echo "DEPENDENCY: \"$dep\" is needed to install cheat.sh in the standalone mode" >&2; _exit_code=1; }
	done
	[ "$_exit_code" -ne 0 ] && return "$_exit_code"

	while true; do
		echo -n "Where should cheat.sh be installed [$default_installdir]? "; read -r installdir
		[ -n "$installdir" ] || installdir="$default_installdir"

		if [ "$installdir" = y ] \
				|| [ "$installdir" = Y ] \
				|| [ "$(echo "$installdir" | tr "[:upper:]" "[:lower:]")" = yes ]
		then
			echo Please enter the directory name
			echo If it was the directory name already, please prepend it with \"./\": "./$installdir"
		else
			break
		fi
	done

	if [ -e "$installdir" ]; then
		echo "ERROR: Installation directory [$installdir] exists already"
		echo "Please remove it first before continuing"
		return 1
	fi

	if ! mkdir -p "$installdir"; then
		echo "ERROR: Could not create the installation directory \"$installdir\""
		echo "ERROR: Please check the permissions and start the script again"
		return 1
	fi

	local space_needed=700
	local space_available; space_available=$(($(df -k "$installdir" | awk '{print $4}' | tail -1)/1024))

	if [ "$space_available" -lt "$space_needed" ]; then
		echo "ERROR: Installation directory has no enough space (needed: ${space_needed}M, available: ${space_available}M"
		echo "ERROR: Please clean up and start the script again"
		rmdir "$installdir"
		return 1
	fi

	_say_what_i_do Cloning cheat.sh locally
	local url=https://github.com/chubin/cheat.sh
	rmdir "$installdir"
	git clone "$url" "$installdir" || fatal Could not clone "$url" with git into "$installdir"
	cd "$installdir" || fatal "Cannot cd into $installdir"

	# after the repository cloned, we may have the log directory
	# and we can write our installation log into it
	mkdir -p "$installdir/log/"
	LOG="$installdir/log/install.log"

	# we use tee everywhere so we should set -o pipefail
	set -o pipefail

	# currently the script uses python 2,
	# but cheat.sh supports python 3 too
	# if you want to switch it to python 3
	# set PYTHON2 to NO:
	# PYTHON2=NO
	#
	PYTHON2=YES
	if [[ $PYTHON2 = YES ]]; then
		python="python2"
		pip="pip"
		virtualenv_python3_option=()
	else
		python="python3"
		pip="pip3"
		virtualenv_python3_option=(-p python3)
	fi

	_say_what_i_do Creating virtual environment
	"$python" "$(command -v virtualenv)" "${virtualenv_python3_option[@]}" ve \
			|| fatal Could not create virtual environment with "python2 $(command -v virtualenv) ve"

	# rapidfuzz does not support Python 2,
	# so if we are using Python 2, install fuzzywuzzy instead
	if [[ $PYTHON2 = YES ]]; then
		sed -i s/rapidfuzz/fuzzywuzzy/ requirements.txt
		echo "python-Levenshtein" >> requirements.txt
	fi

	_say_what_i_do Installing python requirements into the virtual environment
	ve/bin/"$pip" install -r requirements.txt > "$LOG" \
			|| {

		echo "ERROR:"
		echo "---"
		tail -n 10 "$LOG"
		echo "---"
		echo "See $LOG for more"
		fatal Could not install python dependencies into the virtual environment
	}
	echo "$(ve/bin/"$pip" freeze | wc -l) dependencies were successfully installed"

	_say_what_i_do Fetching the upstream cheat sheets repositories
	ve/bin/python lib/fetch.py fetch-all | tee -a "$LOG"

	_say_what_i_do Running self-tests
	(
		cd tests || exit

		if CHEATSH_TEST_STANDALONE=YES \
			 CHEATSH_TEST_SKIP_ONLINE=NO \
			 CHEATSH_TEST_SHOW_DETAILS=NO \
			 PYTHON=../ve/bin/python bash run-tests.sh | tee -a "$LOG"
		then
			printf "\033[0;32m%s\033[0m\n" "SUCCESS"
		else
			printf "\033[0;31m%s\033[0m\n" "FAILED"
			echo "Some tests were failed. Run the tests manually for further investigation:"
			echo "	cd $PWD; bash run-tests.sh)"
		fi
	)

	mkdir -p "$CHTSH_HOME"
	echo "$installdir" > "$CHTSH_HOME/standalone"
	echo auto > "$CHTSH_HOME/mode"

	_say_what_i_do Done

	local v1; v1=$(printf "\033[0;1;32m")
	local v2; v2=$(printf "\033[0m")

	cat <<EOF | sed "s/{/$v1/; s/}/$v2/"

{			 _			}
{			\\ \\		}			The installation is successfully finished.
{			 \\ \\	}
{			 / /		}		Now you can use cheat.sh in the standalone mode,
{			/_/			}		or you can start your own cheat.sh server.


Now the cht.sh shell client is switched to the auto mode, where it uses
the local cheat.sh installation if possible.
You can switch the mode with the --mode switch:

		cht.sh --mode lite			# use https://cheat.sh/ only
		cht.sh --mode auto			# use local installation

You can add your own cheat sheets repository (config is in \`etc/config.yaml\`),
or create new cheat sheets adapters (in \`lib/adapters\`).

To update local copies of cheat sheets repositores on a regular basis,
add the following line to your user crontab (crontab -e):

		10 * * * * $installdir/ve/bin/python $installdir/lib/fetch.py update-all

All cheat sheets will be automatically actualized each hour.

If you are running a server reachable from the Internet, it can be instantly
notified via a HTTP request about any cheat sheets changes. For that, please
open an issue on the cheat.sh project repository [github.com/chubin/cheat.sh]
with the ENTRY-POINT from the URL https://ENTRY-POINT/:actualize specified
EOF
}

chtsh_mode()
{
	local mode="$1"

	local text; text=$(
		echo "	auto		use the standalone installation first"
		echo "	lite		use the cheat sheets server directly"
	)

	if [ -z "$mode" ]; then
		echo "current mode: $CHTSH_MODE ($(printf "%s" "$text" | grep "$CHTSH_MODE" | sed "s/$CHTSH_MODE//; s/^ *//; s/ \+/ /"))"
		if [ -d "$CHEATSH_INSTALLATION" ]; then
			echo "cheat.sh standalone installation: $CHEATSH_INSTALLATION"
		else
			echo 'cheat.sh standalone installation not found; falling back to the "lite" mode'
		fi
	elif [ "$mode" = auto ] || [ "$mode" = lite ]; then
		if [ "$mode" = "$CHTSH_MODE" ]; then
			echo "The configured mode was \"$CHTSH_MODE\"; nothing changed"
		else
			mkdir -p "$CHTSH_HOME"
			echo "$mode" > "$CHTSH_HOME/mode"
			echo "Configured mode: $mode"
		fi
	else
		echo "Unknown mode: $mode"
		echo Supported modes:
		echo "	auto		use the standalone installation first"
		echo "	lite		use the cheat sheets server directly"
	fi
}

get_query_options()
{
	local query="$*"
	if [ -n "$CHTSH_QUERY_OPTIONS" ]; then
		case $query in
			*\?*)		query="$query&${CHTSH_QUERY_OPTIONS}";;
			*)			query="$query?${CHTSH_QUERY_OPTIONS}";;
		esac
	fi
	printf "%s" "$query"
}

do_query()
{
	local query="$*"
	local b_opts=
	local uri="${CHTSH_URL}/\"\$(get_query_options $query)\""

	if [ -e "$HOME/.cht.sh/id" ]; then
		b_opts="-b \"\$HOME/.cht.sh/id\""
	fi

	eval curl "$b_opts" -s "$uri" > "$TMP1"

	if [ -z "$lines" ] || [ "$(wc -l "$TMP1" | awk '{print $1}')" -lt "$lines" ]; then
		cat "$TMP1"
	else
		${PAGER:-$defpager} "$TMP1"
	fi
}

prepare_query()
{
	local section="$1"; shift
	local input="$1"; shift
	local arguments="$1"

	local query
	if [ -z "$section" ] || [ x"${input}" != x"${input#/}" ]; then
		query=$(printf %s "$input" | sed 's@ @/@; s@ @+@g')
	else
		query=$(printf %s "$section/$input" | sed 's@ @+@g')
	fi

	[ -n "$arguments" ] && arguments="?$arguments"
	printf %s "$query$arguments"
}

get_list_of_sections()
{
	curl -s "${CHTSH_URL}"/:list | grep -v '/.*/' | grep '/$' | xargs
}

gen_random_str()
(
	len=$1
	if command -v openssl >/dev/null; then
		openssl rand -base64 $((len*3/4)) | awk -v ORS='' //
	else
		rdev=/dev/urandom
		for d in /dev/{srandom,random,arandom}; do
			test -r "$d" && rdev=$d
		done
		if command -v hexdump >/dev/null; then
			hexdump -vn $((len/2)) -e '1/1 "%02X" 1 ""' "$rdev"
		elif command -v xxd >/dev/null; then
			xxd -l $((len/2)) -ps "$rdev" | awk -v ORS='' //
		else
			cd /tmp || { echo Cannot cd into /tmp >&2; exit 1; }
			s=
			# shellcheck disable=SC2000
			while [ "$(echo "$s" | wc -c)" -lt "$len" ]; do
				s="$s$(mktemp -u XXXXXXXXXX)"
			done
			printf "%.${len}s" "$s"
		fi
	fi
)

if [ "$CHTSH_MODE" = auto ] && [ -d "$CHEATSH_INSTALLATION" ]; then
	curl() {
		# ignoring all options
		# currently the standalone.py does not support them anyway
		local opt
		while getopts "b:s" opt; do
			:
		done
		shift $((OPTIND - 1))

		local url; url="$1"; shift
		PYTHONIOENCODING=UTF-8 "$CHEATSH_INSTALLATION/ve/bin/python" "$CHEATSH_INSTALLATION/lib/standalone.py" "${url#"$CHTSH_URL"}" "$@"
	}
elif [ "$(uname -s)" = OpenBSD ] && [ -x /usr/bin/ftp ]; then
	# any better test not involving either OS matching or actual query?
	curl() {
		local opt args="-o -"
		while getopts "b:s" opt; do
			case $opt in
				b) args="$args -c $OPTARG";;
				s) args="$args -M -V";;
				*) echo "internal error: unsupported cURL option '$opt'" >&2; exit 1;;
			esac
		done
		shift $((OPTIND - 1))
		/usr/bin/ftp "$args" "$@"
	}
else
	command -v curl		>/dev/null || { echo 'DEPENDENCY: install "curl" to use cht.sh' >&2; exit 1; }
	_CURL=$(command -v curl)
	if [ x"$CHTSH_CURL_OPTIONS" != x ]; then
		curl() {
			$_CURL "${CHTSH_CURL_OPTIONS}" "$@"
		}
	fi
fi

if [ "$1" = --read ]; then
	read -r a || a="exit"
	printf "%s\n" "$a"
	exit 0
elif [ x"$1" = x--help ] || [ -z "$1" ]; then

	n=${0##*/}
	s=$(echo "$n" | sed "s/./ /"g)

	cat <<EOF
Usage:

		$n [OPTIONS|QUERY]

Options:

		QUERY										process QUERY and exit

		--help									show this help
		--shell [LANG]					shell mode (open LANG if specified)

		--standalone-install [DIR|help]
														install cheat.sh in the standalone mode
														(by default, into ~/.cheat.sh/)

		--mode [auto|lite]			set (or display) mode of operation
														* auto - prefer the local installation
														* lite - use the cheat sheet server

EOF
	exit 0
elif [ x"$1" = x--shell ]; then
	shell_mode=yes
	shift
elif [ x"$1" = x--standalone-install ]; then
	shift
	cheatsh_standalone_install "$@"
	exit "$?"
elif [ x"$1" = x--mode ]; then
	shift
	chtsh_mode "$@"
	exit "$?"
fi

prompt="cht.sh"
opts=""
input=""
for o; do
	if [ x"$o" != x"${o#-}" ]; then
		opts="${opts}${o#-}"
	else
		input="$input $o"
	fi
done
query=$(echo "$input" | sed 's@ *$@@; s@^ *@@; s@ @/@; s@ @+@g')

if [ "$shell_mode" != yes ]; then
	curl -s "${CHTSH_URL}"/"$(get_query_options "$query")"
	exit 0
else
	new_section="$1"
	valid_sections=$(get_list_of_sections)
	valid=no; for q in $valid_sections; do [ "$q" = "$new_section/" ] && { valid=yes; break; }; done

	if [ "$valid" = yes ]; then
		section="$new_section"
		# shellcheck disable=SC2001
		this_query="$(echo "$input" | sed 's@ *[^ ]* *@@')"
		this_prompt="\033[0;32mcht.sh/$section>\033[0m "
	else
		this_query="$input"
		this_prompt="\033[0;32mcht.sh>\033[0m "
	fi
	if [ -n "$this_query" ] && [ -z "$CHEATSH_RESTART" ]; then
		printf "$this_prompt$this_query\n"
		curl -s "${CHTSH_URL}"/"$(get_query_options "$query")"
	fi
fi

if [ "$is_macos" != yes ]; then
	command -v xsel >/dev/null ||		echo 'DEPENDENCY: please install "xsel" for "copy"' >&2
fi
command -v rlwrap >/dev/null || { echo 'DEPENDENCY: install "rlwrap" to use cht.sh in the shell mode' >&2; exit 1; }

mkdir -p "$HOME/.cht.sh/"
lines=$(tput lines)

if command -v less >/dev/null; then
	defpager="less -R"
elif command -v more >/dev/null; then
	defpager="more"
else
	defpager="cat"
fi

cmd_cd() {
	if [ $# -eq 0 ]; then
		section=""
	else
		new_section=$(echo "$input" | sed 's/cd	 *//; s@/*$@@; s@^/*@@')
		if [ -z "$new_section" ] || [ ".." = "$new_section" ]; then
			section=""
		else
			valid_sections=$(get_list_of_sections)
			valid=no; for q in $valid_sections; do [ "$q" = "$new_section/" ] && { valid=yes; break; }; done
			if [ "$valid" = no ]; then
				echo "Invalid section: $new_section"
				echo "Valid sections:"
				echo "$valid_sections" \
						| xargs printf "%-10s\n" \
						| tr ' ' .	\
						| xargs -n 10 \
						| sed 's/\./ /g; s/^/	 /'
			else
				section="$new_section"
			fi
		fi
	fi
}

cmd_copy() {
	if [ -z "$DISPLAY" ]; then
		echo copy: supported only in the Desktop version
	elif [ -z "$input" ]; then
		echo copy: Make at least one query first.
	else
		curl -s "${CHTSH_URL}"/"$(get_query_options "$query"?T)" > "$TMP1"
		if [ "$is_macos" != yes ]; then
			xsel -bi < "$TMP1"
		else
			pbcopy < "$TMP1"
		fi
		echo "copy: $(wc -l "$TMP1" | awk '{print $1}') lines copied to the selection"
	fi
}

cmd_ccopy() {
	if [ -z "$DISPLAY" ]; then
		echo copy: supported only in the Desktop version
	elif [ -z "$input" ]; then
		echo copy: Make at least one query first.
	else
		curl -s "${CHTSH_URL}"/"$(get_query_options "$query"?TQ)" > "$TMP1"
		if [ "$is_macos" != yes ]; then
			xsel -bi < "$TMP1"
		else
			pbcopy < "$TMP1"
		fi
		echo "copy: $(wc -l "$TMP1" | awk '{print $1}') lines copied to the selection"
	fi
}

cmd_exit() {
	exit 0
}

cmd_help() {
	cat <<EOF
help		- show this help
hush		- do not show the 'help' string at start anymore
cd LANG - change the language context
copy		- copy the last answer in the clipboard (aliases: yank, y, c)
ccopy		- copy the last answer w/o comments (cut comments; aliases: cc, Y, C)
exit		- exit the cheat shell (aliases: quit, ^D)
id [ID] - set/show an unique session id ("reset" to reset, "remove" to remove)
stealth - stealth mode (automatic queries for selected text)
update	- self update (only if the scriptfile is writeable)
version - show current cht.sh version
/:help	- service help
QUERY		- space separated query staring (examples are below)
							cht.sh> python zip list
							cht.sh/python> zip list
							cht.sh/go> /python zip list
EOF
}

cmd_hush() {
	mkdir -p "$HOME/.cht.sh/" && touch "$HOME/.cht.sh/.hushlogin" && echo "Initial 'use help' message was disabled"
}

cmd_id() {
	id_file="$HOME/.cht.sh/id"

	if [ id = "$input" ]; then
		new_id=""
	else
		new_id=$(echo "$input" | sed 's/id	*//; s/ *$//; s/ /+/g')
	fi
	if [ "$new_id" = remove ]; then
		if [ -e "$id_file" ]; then
			rm -f -- "$id_file" && echo "id is removed"
		else
			echo "id was not set, so you can't remove it"
		fi
		return
	fi
	if [ -n "$new_id" ] && [ reset != "$new_id" ] && [ "$(/bin/echo -n "$new_id" | wc -c)" -lt 16 ]; then
		echo "ERROR: $new_id: Too short id. Minimal id length is 16. Use 'id reset' for a random id"
		return
	fi
	if [ -z "$new_id" ]; then
		# if new_id is not specified check if we have some id already
		# if yes, just show it
		# if not, generate a new id
		if [ -e "$id_file" ]; then
			awk '$6 == "id" {print $NF}' <"$id_file" | tail -n 1
			return
		else
			new_id=reset
		fi
	fi
	if [ "$new_id" = reset ]; then
		new_id=$(gen_random_str 12)
	else
		echo WARNING: if someone gueses your id, he can read your cht.sh search history
	fi
	if [ -e "$id_file" ] && grep -q '\tid\t[^\t][^\t]*$' "$id_file" 2> /dev/null; then
		sed -i 's/\tid\t[^\t][^\t]*$/ id '"$new_id"'/' "$id_file"
	else
		if ! [ -e "$id_file" ]; then
			printf '#\n\n' > "$id_file"
		fi
		printf ".cht.sh\tTRUE\t/\tTRUE\t0\tid\t$new_id\n" >> "$id_file"
	fi
	echo "$new_id"
}

cmd_query() {
	query=$(prepare_query "$section" "$input")
	do_query "$query"
}

cmd_stealth() {
	if [ "$input" != stealth ]; then
		arguments=$(echo "$input" | sed 's/stealth //; s/ /\&/')
	fi
	trap break INT
	if [ "$is_macos" = yes ]; then
		past=$(pbpaste)
	else
		past=$(xsel -o)
	fi
	printf "\033[0;31mstealth:\033[0m you are in the stealth mode; select any text in any window for a query\n"
	printf "\033[0;31mstealth:\033[0m selections longer than $STEALTH_MAX_SELECTION_LENGTH words are ignored\n"
	if [ -n "$arguments" ]; then
		printf "\033[0;31mstealth:\033[0m query arguments: ?$arguments\n"
	fi
	printf "\033[0;31mstealth:\033[0m use ^C to leave this mode\n"
	while true; do
		if [ "$is_macos" = yes ]; then
			current=$(pbpaste)
		else
			current=$(xsel -o)
		fi
		if [ "$past" != "$current" ]; then
			past=$current
			current_text="$(echo $current | tr -c '[a-zA-Z0-9]' ' ')"
			if [ "$(echo "$current_text" | wc -w)" -gt "$STEALTH_MAX_SELECTION_LENGTH" ]; then
				echo "\033[0;31mstealth:\033[0m selection length is longer than $STEALTH_MAX_SELECTION_LENGTH words; ignoring"
				continue
			else
				printf "\n\033[0;31mstealth: \033[7m $current_text\033[0m\n"
				query=$(prepare_query "$section" "$current_text" "$arguments")
				do_query "$query"
			fi
		fi
		sleep 1;
	done
	trap - INT
}

cmd_update() {
	[ -w "$0" ] || { echo "The script is readonly; please update manually: curl -s ${CHTSH_URL}/:cht.sh | sudo tee $0"; return; }
	TMP2=$(mktemp /tmp/cht.sh.XXXXXXXXXXXXX)
	curl -s "${CHTSH_URL}"/:cht.sh > "$TMP2"
	if ! cmp "$0" "$TMP2" > /dev/null 2>&1; then
		if grep -q ^__CHTSH_VERSION= "$TMP2"; then
			# section was vaildated by us already
			args=(--shell "$section")
			cp "$TMP2" "$0" && echo "Updated. Restarting..." && rm "$TMP2" && CHEATSH_RESTART=1 exec "$0" "${args[@]}"
		else
			echo "Something went wrong. Please update manually"
		fi
	else
		echo "cht.sh is up to date. No update needed"
	fi
	rm -f "$TMP2" > /dev/null 2>&1
}

cmd_version() {
	insttime=$(ls -l -- "$0" | sed 's/	*/ /g' | cut -d ' ' -f 6-8)
	echo "cht.sh version $__CHTSH_VERSION of $__CHTSH_DATETIME; installed at: $insttime"
	TMP2=$(mktemp /tmp/cht.sh.XXXXXXXXXXXXX)
	if curl -s "${CHTSH_URL}"/:cht.sh > "$TMP2"; then
		if ! cmp "$0" "$TMP2" > /dev/null 2>&1; then
			echo "Update needed (type 'update' for that)".
		else
			echo "Up to date. No update needed"
		fi
	fi
	rm -f "$TMP2" > /dev/null 2>&1
}

TMP1=$(mktemp /tmp/cht.sh.XXXXXXXXXXXXX)
trap 'rm -f $TMP1 $TMP2' EXIT
trap 'true' INT

if ! [ -e "$HOME/.cht.sh/.hushlogin" ] && [ -z "$this_query" ]; then
	echo "type 'help' for the cht.sh shell help"
fi

while true; do
	if [ "$section" != "" ]; then
		full_prompt="$prompt/$section> "
	else
		full_prompt="$prompt> "
	fi

	input=$(
		rlwrap -H "$HOME/.cht.sh/history" -pgreen -C cht.sh -S "$full_prompt" bash "$0" --read | sed 's/ *#.*//'
	)

	cmd_name=${input%% *}
	cmd_args=${input#* }
	case $cmd_name in
		"")							continue;;	 # skip empty input lines
		'?'|h|help)			cmd_name=help;;
		hush)						cmd_name=hush;;
		cd)							cmd_name="cd";;
		exit|quit)			cmd_name="exit";;
		copy|yank|c|y)	cmd_name=copy;;
		ccopy|cc|C|Y)		cmd_name=ccopy;;
		id)							cmd_name=id;;
		stealth)				cmd_name=stealth;;
		update)					cmd_name=update;;
		version)				cmd_name=version;;
		*)							cmd_name="query"; cmd_args="$input";;
	esac
	"cmd_$cmd_name" $cmd_args 
done
