#!/usr/bin/env bash
# -----------------------------------------------------------------------------
# bat-extras | Copyright (C) 2020-2024 eth-p and contributors | MIT License
#
# Repository: https://github.com/eth-p/bat-extras
# Issues:     https://github.com/eth-p/bat-extras/issues
# -----------------------------------------------------------------------------
#!/usr/bin/env bash
SHIFTOPT_HOOKS=()
SHIFTOPT_SHORT_OPTIONS="VALUE"
setargs(){
_ARGV=("$@")
_ARGV_LAST="$((${#_ARGV[@]}-1))"
_ARGV_INDEX=0
_ARGV_SUBINDEX=1
}
getargs(){
if [[ $1 == "-a" || $1 == "--append" ]];then
if [[ $_ARGV_INDEX -ne "$((_ARGV_LAST+1))" ]];then
eval "$2=(\"\${$2[@]}\" $(printf '%q ' "${_ARGV[@]:_ARGV_INDEX}"))"
fi
else
if [[ $_ARGV_INDEX -ne "$((_ARGV_LAST+1))" ]];then
eval "$1=($(printf '%q ' "${_ARGV[@]:_ARGV_INDEX}"))"
else
eval "$1=()"
fi
fi
}
resetargs(){
setargs "${_ARGV_ORIGINAL[@]}"
}
_shiftopt_next(){
_ARGV_SUBINDEX=1
((_ARGV_INDEX++))||true
}
shiftopt(){
[[ $_ARGV_INDEX -gt $_ARGV_LAST ]]&&return 1
OPT="${_ARGV[$_ARGV_INDEX]}"
unset OPT_VAL
if [[ $OPT =~ ^-[a-zA-Z0-9_-]+=.* ]];then
OPT_VAL="${OPT#*=}"
OPT="${OPT%%=*}"
fi
if [[ $OPT =~ ^-[^-]{2,} ]];then
case "$SHIFTOPT_SHORT_OPTIONS" in
PASS)_shiftopt_next;;
CONV)OPT="-$OPT"
_shiftopt_next
;;
VALUE){
OPT="${_ARGV[$_ARGV_INDEX]}"
OPT_VAL="${OPT:2}"
OPT="${OPT:0:2}"
_shiftopt_next
};;
SPLIT){
OPT="-${OPT:_ARGV_SUBINDEX:1}"
((_ARGV_SUBINDEX++))||true
if [[ $_ARGV_SUBINDEX -gt ${#OPT} ]];then
_shiftopt_next
fi
};;
*)printf "shiftopt: unknown SHIFTOPT_SHORT_OPTIONS mode '%s'" \
"$SHIFTOPT_SHORT_OPTIONS" 1>&2
_shiftopt_next
esac
else
_shiftopt_next
fi
local hook
for hook in "${SHIFTOPT_HOOKS[@]}";do
if "$hook";then
shiftopt
return $?
fi
done
return 0
}
shiftval(){
if [[ -n ${OPT_VAL+x} ]];then
return 0
fi
if [[ $_ARGV_SUBINDEX -gt 1 && $SHIFTOPT_SHORT_OPTIONS == "SPLIT" ]];then
OPT_VAL="${_ARGV[$((_ARGV_INDEX+1))]}"
else
OPT_VAL="${_ARGV[$_ARGV_INDEX]}"
_shiftopt_next
fi
if [[ $OPT_VAL =~ -.* ]];then
printc "%{RED}%s: '%s' requires a value%{CLEAR}\n" "batwatch" "$ARG"
exit 1
fi
}
setargs "$@"
_ARGV_ORIGINAL=("$@")
hook_color(){
SHIFTOPT_HOOKS+=("__shiftopt_hook__color")
__shiftopt_hook__color(){
case "$OPT" in
--no-color)OPT_COLOR=false;;
--color){
case "$OPT_VAL" in
"")OPT_COLOR=true;;
always|true)OPT_COLOR=true;;
never|false)OPT_COLOR=false;;
auto)return 0;;
*)printc "%{RED}%s: '--color' expects value of 'auto', 'always', or 'never'%{CLEAR}\n" "batwatch"
exit 1
esac
};;
*)return 1
esac
printc_init "$OPT_COLOR"
return 0
}
if [[ -z $OPT_COLOR ]];then
if [[ -t 1 ]];then
OPT_COLOR=true
else
OPT_COLOR=false
fi
printc_init "$OPT_COLOR"
fi
}
hook_help(){
SHIFTOPT_HOOKS+=("__shiftopt_hook__help")
if [[ $1 == "--no-short" ]];then
__shiftopt_hook__help(){
if [[ $OPT == "--help" ]];then
show_help
exit 0
fi
return 1
}
else
__shiftopt_hook__help(){
if [[ $OPT == "--help" ]]||[[ $OPT == "-h" ]];then
show_help
exit 0
fi
return 1
}
fi
}
hook_version(){
SHIFTOPT_HOOKS+=("__shiftopt_hook__version")
__shiftopt_hook__version(){
if [[ $OPT == "--version" ]];then
printf "%s %s\n\n%s\n%s\n" \
"batwatch" \
"2024.08.24" \
"Copyright (C) 2019-2021 eth-p | MIT License" \
"https://github.com/eth-p/bat-extras"
exit 0
fi
return 1
}
}
term_width(){
local width="$({ stty size 2>/dev/null||echo "22 80";}|cut -d ' ' -f2)"
if [[ $width -ne 0 ]];then
echo "$width"
else
echo "80"
fi
return 0
}
term_clear(){
printf "\x1B[3J\x1B[2J\x1B[H"
}
hook_width(){
SHIFTOPT_HOOKS+=("__shiftopt_hook__width")
__shiftopt_hook__width(){
case "$OPT" in
--terminal-width)shiftval
OPT_TERMINAL_WIDTH="$OPT_VAL"
;;
*)return 1
esac
return 0
}
OPT_TERMINAL_WIDTH="$(term_width)"
}
printc(){
printf "$(sed "$_PRINTC_PATTERN" <<<"$1")" "${@:2}"
}
printc_init(){
case "$1" in
true)_PRINTC_PATTERN="$_PRINTC_PATTERN_ANSI";;
false)_PRINTC_PATTERN="$_PRINTC_PATTERN_PLAIN";;
"[DEFINE]"){
_PRINTC_PATTERN_ANSI=""
_PRINTC_PATTERN_PLAIN=""
local name
local ansi
while read -r name ansi;do
if [[ -z $name && -z $ansi ]]||[[ ${name:0:1} == "#" ]];then
continue
fi
ansi="${ansi/\\/\\\\}"
_PRINTC_PATTERN_PLAIN="${_PRINTC_PATTERN_PLAIN}s/%{$name}//g;"
_PRINTC_PATTERN_ANSI="${_PRINTC_PATTERN_ANSI}s/%{$name}/$ansi/g;"
done
if [[ -t 1 && -z ${NO_COLOR+x} ]];then
_PRINTC_PATTERN="$_PRINTC_PATTERN_ANSI"
else
_PRINTC_PATTERN="$_PRINTC_PATTERN_PLAIN"
fi
}
esac
}
print_warning(){
printc "%{YELLOW}[%s warning]%{CLEAR}: $1%{CLEAR}\n" "batwatch" "${@:2}" 1>&2
}
print_error(){
printc "%{RED}[%s error]%{CLEAR}: $1%{CLEAR}\n" "batwatch" "${@:2}" 1>&2
}
printc_init "[DEFINE]" <<END
	CLEAR	\x1B[0m
	RED		\x1B[31m
	GREEN	\x1B[32m
	YELLOW	\x1B[33m
	BLUE	\x1B[34m
	MAGENTA	\x1B[35m
	CYAN	\x1B[36m

	DEFAULT \x1B[39m
	DIM		\x1B[2m
END
is_pager_less(){
[[ "$(pager_name)" == "less" ]]
return $?
}
is_pager_bat(){
[[ "$(pager_name)" == "bat" ]]
return $?
}
is_pager_disabled(){
[[ -z "$(pager_name)" ]]
return $?
}
pager_name(){
_detect_pager 1>&2
echo "$_SCRIPT_PAGER_NAME"
}
pager_version(){
_detect_pager 1>&2
echo "$_SCRIPT_PAGER_VERSION"
}
pager_exec(){
if [[ -n $SCRIPT_PAGER_CMD ]];then
"$@"|pager_display
return $?
else
"$@"
return $?
fi
}
pager_display(){
if [[ -n $SCRIPT_PAGER_CMD ]];then
if [[ -n $SCRIPT_PAGER_ARGS ]];then
"${SCRIPT_PAGER_CMD[@]}" "${SCRIPT_PAGER_ARGS[@]}"
return $?
else
"${SCRIPT_PAGER_CMD[@]}"
return $?
fi
else
cat
return $?
fi
}
_detect_pager(){
if [[ $_SCRIPT_PAGER_DETECTED == "true" ]];then return;fi
_SCRIPT_PAGER_DETECTED=true
if [[ -z ${SCRIPT_PAGER_CMD[0]} ]];then
_SCRIPT_PAGER_VERSION=0
_SCRIPT_PAGER_NAME=""
return
fi
local output
local output1
output="$("${SCRIPT_PAGER_CMD[0]}" --version 2>&1)"
output1="$(head -n 1 <<<"$output")"
if [[ $output1 =~ ^less[[:blank:]]([[:digit:]]+) ]];then
_SCRIPT_PAGER_VERSION="${BASH_REMATCH[1]}"
_SCRIPT_PAGER_NAME="less"
elif [[ $output1 =~ ^bat(cat)?[[:blank:]]([[:digit:]]+) ]];then
__BAT_VERSION="${BASH_REMATCH[2]}"
_SCRIPT_PAGER_VERSION="${BASH_REMATCH[2]}"
_SCRIPT_PAGER_NAME="bat"
else
_SCRIPT_PAGER_VERSION=0
_SCRIPT_PAGER_NAME="$(basename "${SCRIPT_PAGER_CMD[0]}")"
fi
}
_configure_pager(){
SCRIPT_PAGER_ARGS=()
if [[ -n ${PAGER+x} ]];then
SCRIPT_PAGER_CMD=($PAGER)
else
SCRIPT_PAGER_CMD=("less")
fi
if [[ -n ${BAT_PAGER+x} ]];then
SCRIPT_PAGER_CMD=($BAT_PAGER)
SCRIPT_PAGER_ARGS=()
return
fi
if is_pager_bat;then
SCRIPT_PAGER_CMD=("less")
SCRIPT_PAGER_ARGS=()
fi
if is_pager_less;then
SCRIPT_PAGER_CMD=("${SCRIPT_PAGER_CMD[0]}" -R --quit-if-one-screen)
if [[ "$(pager_version)" -lt 500 ]];then
SCRIPT_PAGER_CMD+=(--no-init)
fi
fi
}
if [[ -t 1 ]];then
_configure_pager
else
SCRIPT_PAGER_CMD=()
SCRIPT_PAGER_ARGS=()
fi
bat_version(){
if [[ -z $__BAT_VERSION ]];then
__BAT_VERSION="$(command "bat" --version|cut -d ' ' -f 2)"
fi
echo "$__BAT_VERSION"
}
version_compare(){
local version="$1"
local compare="$3"
if ! [[ $version =~ \.$ ]];then
version="$version."
fi
if ! [[ $compare =~ \.$ ]];then
compare="$compare."
fi
version_compare__recurse "$version" "$2" "$compare"
return $?
}
version_compare__recurse(){
local version="$1"
local operator="$2"
local compare="$3"
local v_major="${version%%.*}"
local c_major="${compare%%.*}"
local v_minor="${version#*.}"
local c_minor="${compare#*.}"
if [[ -z $v_minor && -z $c_minor ]];then
[ "$v_major" $operator "$c_major" ]
return $?
fi
if [[ -z $v_minor ]];then
v_minor="0."
fi
if [[ -z $c_minor ]];then
c_minor="0."
fi
case "$operator" in
-eq)[[ $v_major -ne $c_major ]]&&return 1;;
-ne)[[ $v_major -ne $c_major ]]&&return 0;;
-ge|-gt)[[ $v_major -lt $c_major ]]&&return 1
[[ $v_major -gt $c_major ]]&&return 0
;;
-le|-lt)[[ $v_major -gt $c_major ]]&&return 1
[[ $v_major -lt $c_major ]]&&return 0
esac
version_compare__recurse "$v_minor" "$operator" "$c_minor"
}
hook_color
hook_version
hook_width
hook_help
show_help(){
echo 'Usage: batwatch --file [--watcher entr|poll][--[no-]clear] <file> [<file> ...]'
echo '       batwatch --command [-n<interval>] <command> [<arg> ...]'
}
WATCHERS=("entr" "poll")
watcher_entr_watch(){
ENTR_ARGS=()
if [[ $OPT_CLEAR == "true" ]];then
ENTR_ARGS+=('-c')
fi
entr "${ENTR_ARGS[@]}" \
"bat" "${BAT_ARGS[@]}" \
--terminal-width="$OPT_TERMINAL_WIDTH" \
--paging=never \
"$@" < \
<(printf "%s\n" "$@")
}
watcher_entr_supported(){
command -v entr &>/dev/null
return $?
}
POLL_STAT_VARIANT=''
POLL_STAT_COMMAND=()
determine_stat_variant(){
if [[ -n $POLL_STAT_VARIANT ]];then
return 0
fi
local variant name flags ts
for variant in "gnu -c %Z" "bsd -f %m";do
read -r name flags <<<"$variant"
if read -r ts < <(stat $flags "$0" 2>/dev/null);then
if [[ $ts =~ ^[0-9]+$ ]];then
POLL_STAT_COMMAND=(stat $flags)
POLL_STAT_VARIANT="$name"
return 0
fi
fi
done
return 1
}
watcher_poll_watch(){
determine_stat_variant
local files=("$@")
local times=()
local file
local time
local modified=true
for file in "${files[@]}";do
time="$("${POLL_STAT_COMMAND[@]}" "$file")"
times+=("$time")
done
while true;do
if "$modified";then
modified=false
clear
"bat" "${BAT_ARGS[@]}" \
--terminal-width="$OPT_TERMINAL_WIDTH" \
--paging=never \
"${files[@]}"
fi
local i=0
for file in "${files[@]}";do
time="$("${POLL_STAT_COMMAND[@]}" "$file")"
if [[ $time -ne ${times[$i]} ]];then
times[$i]="$time"
modified=true
fi
((i++))
done
local input
read -r -t "$OPT_INTERVAL" input
if [[ $input =~ [q|Q] ]];then
exit
fi
done
"${POLL_STAT_COMMAND[@]}" "$@"
local ts
}
watcher_poll_supported(){
determine_stat_variant
return $?
}
determine_watcher(){
local watcher
for watcher in "${WATCHERS[@]}";do
if "watcher_${watcher}_supported";then
OPT_WATCHER="$watcher"
return 0
fi
done
return 1
}
BAT_ARGS=(--paging=never)
FILES=()
FILES_HAS_DIRECTORY=false
OPT_MODE=file
OPT_INTERVAL=3
OPT_CLEAR=true
OPT_WATCHER=""
if [[ -t 1 ]];then
OPT_COLOR=true
fi
while shiftopt;do
case "$OPT" in
--watcher)shiftval
OPT_WATCHER="$OPT_VAL"
;;
--interval|-n)shiftval
OPT_INTERVAL="$OPT_VAL"
;;
--file|-f)OPT_MODE=file;;
--command|-x)OPT_MODE=command;;
--clear)OPT_CLEAR=true;;
--no-clear)OPT_CLEAR=false;;
-*)BAT_ARGS+=("$OPT=$OPT_VAL");;
*){
FILES+=("$OPT")
if [[ $OPT_MODE == "command" ]];then
getargs --append FILES
break
fi
}
esac
done
if [[ ${#FILES[@]} -eq 0 ]];then
if [[ $OPT_MODE == "file" ]];then
print_error "no files provided"
else
print_error "no command provided"
fi
exit 1
fi
if [[ $OPT_MODE == "file" ]];then
for file in "${FILES[@]}";do
if ! [[ -e $file ]];then
print_error "'%s' does not exist" "$file"
exit 1
fi
if [[ -d $file ]];then
FILES_HAS_DIRECTORY=true
fi
done
fi
if "$OPT_COLOR";then
BAT_ARGS+=("--color=always")
else
BAT_ARGS+=("--color=never")
fi
if [[ $OPT_CLEAR == "true" ]];then
if "$OPT_COLOR";then
clear(){
term_clear||return $?
}
fi
else
clear(){
:
}
fi
if [[ $OPT_MODE == "file" ]];then
if [[ -z $OPT_WATCHER ]];then
if ! determine_watcher;then
print_error "Your system does not have any supported watchers."
printc "Please read the documentation at %{BLUE}%s%{CLEAR} for more details.\n" "https://github.com/eth-p/bat-extras" 1>&2
exit 2
fi
else
if ! type "watcher_${OPT_WATCHER}_supported" &>/dev/null;then
print_error "Unknown watcher: '%s'" "$OPT_WATCHER"
exit 1
fi
if ! "watcher_${OPT_WATCHER}_supported" &>/dev/null;then
print_error "Unsupported watcher: '%s'" "$OPT_WATCHER"
exit 1
fi
fi
main(){
"watcher_${OPT_WATCHER}_watch" "${FILES[@]}"
return $?
}
else
BAT_VERSION="$(bat_version)"
if version_compare "$BAT_VERSION" -ge "0.14";then
BAT_ARGS+=(--file-name="${FILES[*]}")
fi
main(){
local last_rendered
local rendered
local term_width="$(term_width)"
BAT_ARGS+=("--terminal-width=$term_width")
while true;do
IFS='' rendered="$("${FILES[@]}" 2>&1|"bat" "${BAT_ARGS[@]}")"
if [ "$rendered" != "$last_rendered" ];then
last_rendered="$rendered"
clear
printf "%s\n" "$rendered"
rendered=''
fi
sleep "$OPT_INTERVAL"||exit 1
done
}
fi
main
exit $?
