tldr-bash-client/tldr

516 lines
18 KiB
Bash
Executable File

#!/usr/bin/env bash
set +vx -o pipefail
[[ $- = *i* ]] && echo "Don't source this script!" && return 1
version=0.6.2
# tldr-bash-client v0.6.2
# Bash client for tldr: community driven man-by-example
# - forked from Ray Lee, https://github.com/raylee/tldr
# - modified and expanded by pepa65: https://gitlab.com/pepa65/tldr-bash-client
# - binary download: https://good4.eu/tldr
# Requiring: coreutils, grep, unzip, curl/wget, less (optional)
# The 5 elements in TLDR markup that can be styled with these colors and
# backgrounds (last one specified will be used) and modes (more can apply):
# Colors: Black, Red, Green, Yellow, Blue, Magenta, Cyan, White
# BG: BlackBG, RedBG, GreenBG, YellowBG, BlueBG, MagentaBG, CyanBG, WhiteBG
# Modes: Bold, Underline, Italic, Inverse
# 'Newline' can be added to the style list to add a newline before the element
# and 'Space' to add a space at the start of the line
# (style items are separated by space, lower/uppercase mixed allowed)
: ${TLDR_TITLE_STYLE="Newline Space Bold Yellow"}
: ${TLDR_DESCRIPTION_STYLE="Space Yellow"}
: ${TLDR_EXAMPLE_STYLE="Newline Space Bold Green"}
: ${TLDR_CODE_STYLE="Space Bold Blue"}
: ${TLDR_VALUE_ISTYLE="Space Bold Cyan"}
# The Value style (above) is an Inline style: doesn't take Newline or Space
# Inline styles for help text: default, URL, option, platform, command, header
: ${TLDR_DEFAULT_ISTYLE="White"}
: ${TLDR_URL_ISTYLE="Yellow"}
: ${TLDR_HEADER_ISTYLE="Bold"}
: ${TLDR_OPTION_ISTYLE="Bold Yellow"}
: ${TLDR_PLATFORM_ISTYLE="Bold Blue"}
: ${TLDR_COMMAND_ISTYLE="Bold Cyan"}
: ${TLDR_FILE_ISTYLE="Bold Magenta"}
# Color/BG (Newline and Space also allowed) for error and info messages
: ${TLDR_ERROR_COLOR="Newline Space Red"}
: ${TLDR_INFO_COLOR="Newline Space Green"}
# How many days before freshly downloading a potentially stale page
: ${TLDR_EXPIRY:=7}
# Alternative location of pages cache
: ${TLDR_CACHE_LOCATION=""}
# Usage of 'less' or 'cat' for output (set to '0' for cat)
: ${TLDR_LESS:=1}
# Force current OS
: ${TLDR_OS=""}
# Force preferred language: ISO639 format (2 lowercase letters)
: ${TLDR_LANG=""}
## Function definitions
# $1: [optional] exit code; Uses: ver cachedir
Usage(){
Out "$(cat <<-EOF
$E$ver
${HDE}USAGE: $HHE$(basename "$0")$XHHE [${HOP}option$XHOP] [[${HPL}platform$XHPL/]${HCO}command$XHCO]
$HDE[${HPL}platform$XHPL/]${HCO}command$XHCO: Show page for ${HCO}command$XHCO (from ${HPL}platform$XHPL)
${HPL}platform$XHPL (optional) one of: ${HPL}${platforms//,/$XHPL, $HPL}$XHPL,
${HPL}current$XHPL (includes ${HPL}common$XHPL), ${HPL}all$XHPL (default)
${HOP}option$XHOP (optional) one of:
$HOP-s$XHOP, $HOP--search$XHOP ${HFI}regex$XHFI [$HFI..$XHFI]: Search for (combined) ${HFI}regex(es)$XHFI in all tldr pages
$HOP-l$XHOP, $HOP--list$XHOP [${HPL}platform$XHPL]: List all pages (from ${HPL}platform$XHPL)
$HOP-a$XHOP, $HOP--list-all$XHOP: List all pages from ${HPL}current$XHPL platform
$HOP-r$XHOP, $HOP--render$XHOP ${HFI}file$XHFI: Render ${HFI}file$XHFI as tldr markdown
$HOP-m$XHOP, $HOP--markdown$XHOP ${HCO}command$XHCO: Show the markdown source for ${HCO}command$XHCO
$HOP-u$XHOP, $HOP--update$XHOP: Update the pages cache by downloading archive
$HOP-v$XHOP, $HOP--version$XHOP: Version number and gitlab repo location
$HDE[$HOP-h$XHOP, $HOP-?$XHOP, $HOP--help$XHOP]: This help overview
${HDE}Element styling:$XHDE ${T}Title$XT ${D}Description$XD ${E}Example$XE ${C}Code$XC ${V}Value$XV
${HDE}All pages and the index are cached locally under $HUR$cachedir$XHUR.
${HDE}Cached pages will be freshly downloaded after $HUR$TLDR_EXPIRY$XHUR days. Preferred language: $lang.
EOF
)"
exit "${1:-0}"
}
# $1: keep output; Uses/Sets: stdout
Out(){ stdout+=$1$N;}
# $1: keep error messages
Err(){ Out "$ERRNL$ERRSP$ERR$B$1$XB$XERR";}
# $1: keep info messages
Inf(){ Out "$INFNL$INFSP$INF$B$1$XB$XINF";}
# $1: Style specification; Uses: color xcolor bg xbg mode xmode
Style(){
local -l style
STYLES= XSTYLES= COLOR= XCOLOR= NL= SP=
for style in $1
do
[[ $style = newline ]] && NL=$N
[[ $style = space ]] && SP=' '
COLOR+=${color[$style]:-}${bg[$style]:-}
XCOLOR=${xbg[$style]:-}${xcolor[$style]:-}$XCOLOR
STYLES+=${color[$style]:-}${bg[$style]:-}${mode[$style]:-}
XSTYLES=${xmode[$style]:-}${xbg[$style]:-}${xcolor[$style]:-}$XSTYLES
done
}
# Sets: color xcolor bg xbg mode xmode
Init_term(){
if [[ -t 2 ]]
then # only if interactive session (stderr open)
B=$'\e[1m' # $(tput bold || tput md) # Start bold
XB=$'\e[0m' # End bold (no tput code...)
U=$'\e[4m' # $(tput smul || tput us) # Start underline
XU=$'\e[24m' # $(tput rmul || tput ue) # End underline
I=$'\e[3m' # $(tput sitm || tput ZH) # Start italic
XI=$'\e[23m' # $(tput ritm || tput ZR) # End italic
R=$'\e[7m' # $(tput smso || tput so) # Start reverse
XR=$'\e[27m' # $(tput rmso || tput se) # End reverse
#X=$'\e[0m' # $(tput sgr0 || tput me) # End all
if [[ $TERM != *-m ]]
then
BLA=$'\e[30m' # $(tput setaf 0 || tput AF 0)
RED=$'\e[31m' # $(tput setaf 1 || tput AF 1)
GRE=$'\e[32m' # $(tput setaf 2 || tput AF 2)
YEL=$'\e[33m' # $(tput setaf 3 || tput AF 3)
BLU=$'\e[34m' # $(tput setaf 4 || tput AF 4)
MAG=$'\e[35m' # $(tput setaf 5 || tput AF 5)
CYA=$'\e[36m' # $(tput setaf 6 || tput AF 6)
WHI=$'\e[37m' # $(tput setaf 7 || tput AF 7)
DEF=$'\e[39m' # $(tput op)
BLAB=$'\e[40m' # $(tput setab 0 || tput AB 0)
REDB=$'\e[41m' # $(tput setab 1 || tput AB 1)
GREB=$'\e[42m' # $(tput setab 2 || tput AB 2)
YELB=$'\e[43m' # $(tput setab 3 || tput AB 3)
BLUB=$'\e[44m' # $(tput setab 4 || tput AB 4)
MAGB=$'\e[45m' # $(tput setab 5 || tput AB 5)
CYAB=$'\e[46m' # $(tput setab 6 || tput AB 6)
WHIB=$'\e[47m' # $(tput setab 7 || tput AB 7)
DEFB=$'\e[49m' # $(tput op)
fi
fi
declare -A color=(['black']=$BLA ['red']=$RED ['green']=$GRE ['yellow']=$YEL \
['blue']=$BLU ['magenta']=$MAG ['cyan']=$CYA ['white']=$WHI)
declare -A xcolor=(['black']=$DEF ['red']=$DEF ['green']=$DEF ['yellow']=$DEF \
['blue']=$DEF ['magenta']=$DEF ['cyan']=$DEF ['white']=$DEF)
declare -A bg=(['blackbg']=$BLAB ['redbg']=$REDB ['greenbg']=$GREB ['yellowbg']=$YELB \
['bluebg']=$BLUB ['magentabg']=$MAGB ['cyanbg']=$CYAB ['whitebg']=$WHIB)
declare -A xbg=(['blackbg']=$DEFB ['redbg']=$DEFB ['greenbg']=$DEFB ['yellowbg']=$DEFB \
['bluebg']=$DEFB ['magentabg']=$DEFB ['cyanbg']=$DEFB ['whitebg']=$DEFB)
declare -A mode=(['bold']=$B ['underline']=$U ['italic']=$I ['inverse']=$R)
declare -A xmode=(['bold']=$XB ['underline']=$XU ['italic']=$XI ['inverse']=$XR)
# the 5 main tldr page styles and error message colors
Style "$TLDR_TITLE_STYLE"
T=$STYLES XT=$XSTYLES TNL=$NL TSP=$SP
Style "$TLDR_DESCRIPTION_STYLE"
D=$STYLES XD=$XSTYLES DNL=$NL DSP=$SP
Style "$TLDR_EXAMPLE_STYLE"
E=$STYLES XE=$XSTYLES ENL=$NL ESP=$SP
Style "$TLDR_CODE_STYLE"
C=$STYLES XC=$XSTYLES CNL=$NL CSP=$SP
Style "$TLDR_VALUE_ISTYLE"
V=$STYLES XV=$XSTYLES
Style "$TLDR_DEFAULT_ISTYLE"
HDE=$STYLES XHDE=$XSTYLES
Style "$TLDR_URL_ISTYLE"
URL=$STYLES XURL=$XSTYLES
HUR=$XHDE$STYLES XHUR=$XSTYLES$HDE
Style "$TLDR_OPTION_ISTYLE"
HOP=$XHDE$STYLES XHOP=$XSTYLES$HDE
Style "$TLDR_PLATFORM_ISTYLE"
HPL=$XHDE$STYLES XHPL=$XSTYLES$HDE
Style "$TLDR_COMMAND_ISTYLE"
HCO=$XHDE$STYLES XHCO=$XSTYLES$HDE
Style "$TLDR_FILE_ISTYLE"
HFI=$XHDE$STYLES XHFI=$XSTYLES$HDE
Style "$TLDR_HEADER_ISTYLE"
HHE=$XHDE$STYLES XHHE=$XSTYLES$HDE
Style "$TLDR_ERROR_COLOR"
ERR=$COLOR XERR=$XCOLOR ERRNL=$NL ERRSP=$SP
Style "$TLDR_INFO_COLOR"
INF=$COLOR XINF=$XCOLOR INFNL=$NL INFSP=$SP
}
# $1: page
Recent(){ [[ $(find "$1" -mtime -"$TLDR_EXPIRY" 2>/dev/null) ]];}
# Initialize globals, check the environment; Uses: config cachedir version
# Sets: stdout os version dl pages
Config(){
# Don't use less if no stdout or less not available
[[ ! -t 1 ]] && ! type -P less >/dev/null && TLDR_LESS=0
stdout= Q='"' N=$'\n'
TLDR_OS=${TLDR_OS// } TLDR_LESS=${TLDR_LESS// } TLDR_EXPIRY=${TLDR_EXPIRY// }
[[ $TLDR_OS ]] && os=$TLDR_OS ||
case "$(uname -s)" in
Darwin) os='osx' ;;
Linux) os='linux' ;;
SunOS) os='sunos' ;;
CYGWIN*|MINGW*) os='windows' ;;
*) os=
esac
lang=${TLDR_LANG:-$LANG} lang=${lang:0:2} lang=${lang,,}
[[ $lang = en ]] && pages=pages || pages=pages.$lang
Init_term
[[ $TLDR_LESS = 0 ]] &&
trap 'cat <<<"$stdout"' EXIT ||
trap 'less -Gg -~RXQFP"Browse up/down, press Q to exit " <<<"$stdout"' EXIT
ver="tldr-bash-client version $version$XB ${URL}https://gitlab.com/pepa65/tldr-bash-client$XURL"
# Select download method
! dl="$(type -P curl) --connect-timeout 10 -sLfo" &&
! dl="$(type -P wget) --timeout=10 --max-redirect=20 -qNO" &&
Err "tldr requires ${I}curl$XI or ${I}wget$XI installed in your path" &&
exit 3
repo_url='https://raw.githubusercontent.com/tldr-pages/tldr/main'
zip_url='https://tldr.sh/assets/tldr.zip'
cachedir=$TLDR_CACHE_LOCATION
if [[ -z $cachedir ]]
then
[[ $XDG_DATA_HOME ]] && cachedir=$XDG_DATA_HOME/tldr ||
cachedir=$HOME/.local/share/tldr
fi
! [[ -d "$cachedir" ]] &&
! mkdir -p "$cachedir" &&
Err "Can't create the pages cache location $cachedir" &&
exit 4
# Indexes for every language should be available, $pages instead of pages
index=$cachedir/index.json
# update if the file doesn't exists, or if it's older than $TLDR_EXPIRY
[[ -f $index ]] && Recent "$index" || Cache_fill
platforms=$(cd "$cachedir/pages"; ls -d -- */ |tr -d /)
platforms=${platforms//$'\n'/,}
}
# $1: error message; Uses: md REPLY ln
Unlinted(){
Err "Page $I$md$XI not properly linted!$N${ERRSP}${ERR}Line $I$ln$XI [$XERR$U$REPLY$XU$ERR]$N$ERRSP$ERR$1"
exit 5
}
# $1: page; Uses: index cachedir repo_url platform os dl cached md
# Sets: cached md
Get_tldr(){
local desc err=0 notfound
# convert the local platform name to tldr's version
# extract the platform key from index.json, return preferred subpath to page
desc=$(tr '{' '\n' <"$index" |grep "\"name\":\"$1\"")
# results in, eg, "name":"netstat","platform":["linux","osx"]},
[[ $desc ]] || return # nothing found
if [[ $platform ]]
then # platform given on commandline
if [[ $platform = current ]]
then
[[ $desc =~ \"common\" ]] && md=common/$1.md
[[ $desc =~ \"$os\" ]] && md=$os/$1.md
elif [[ $desc =~ \"$platform\" ]]
then md=$platform/$1.md
else notfound=$I$platform$XI err=1
fi
else # no platform specified: check common
if [[ $desc =~ \"common\" ]]
then md=common/$1.md
else # not in common either
[[ $notfound ]] && notfound+=" or "
notfound+=${I}common$XI
fi
fi
# if no page found yet, try the system platform
[[ $md ]] ||
if [[ $desc =~ \"$os\" ]]
then md=$os/$1.md
else [[ -z $os || $platform = $os ]] || notfound+=" or $I$os$XI" err=1
fi
# if still no page found, get the first entry in index
[[ $md ]] || md=$(cut -d "$Q" -f 8 <<<"$desc")/"$1.md"
((err)) && Err "tldr page $I$1$XI not found in $notfound, from platform $U${md%/*}$XU instead"
# return local cached copy of tldr-page, or retrieve and cache from github
cached=$cachedir/$pages/$md
[[ $cached ]] || cached=$cachedir/pages/$md
if ! Recent "$cached"
then
mkdir -p "${cached%/*}"
$dl "$cached" "$repo_url/$pages/$md" &&
Inf "Downloaded page '$pages/$md'" ||
Err "Could not download $repo_url/$pages/$md"
fi
}
# $1: file (optional); Uses: page stdout; Sets: ln REPLY
Display_tldr(){
local newfmt len val reply
ln=0 REPLY=
[[ $md ]] || md=$1
# Read full lines, and process even when no newline at the end
while read -r || [[ $REPLY ]]
do
((++ln))
if ((ln==1))
then
[[ ${REPLY:0:1} = '#' ]] && newfmt=0 || newfmt=1
if ((newfmt))
then
[[ $REPLY ]] || Unlinted "Empty title"
Out "$TNL$TSP$T$REPLY$XT"
len=${#REPLY} # title length
read -r
((++ln))
[[ $REPLY =~ [^=] ]] && Unlinted "Title underline must be equal signs"
((len!=${#REPLY})) && Unlinted "Underline length not equal to title's"
read -r
((++ln))
fi
fi
case "${REPLY:0:1}" in # first character
'#') ((newfmt)) && Unlinted "Bad first character"
((${#REPLY} <= 2)) && Unlinted "No title"
[[ ! ${REPLY:1:1} = ' ' ]] && Unlinted "2nd character no space"
Out "$TNL$TSP$T${REPLY:2}$XT" ;;
'>') ((${#REPLY} <= 3)) && Unlinted "No valid desciption"
[[ ! ${REPLY:1:1} = ' ' ]] && Unlinted "2nd character no space"
reply=${REPLY//$'\n'}
[[ ! ${reply: -1} = '.' && ! ${reply: -1} = '。' ]] && Unlinted "Description doesn't end in full stop"
Out "$DNL$DSP$D${REPLY:2}$XD"
DNL= ;;
'-') ((newfmt)) && Unlinted "Bad first character"
((${#REPLY} <= 2)) && Unlinted "No example content"
[[ ! ${REPLY:1:1} = ' ' ]] && Unlinted "2nd character no space"
Out "$ENL$ESP$E${REPLY:2}$XE" ;;
' ') ((newfmt)) || Unlinted "Bad first character"
((${#REPLY} <= 4)) && Unlinted "No valid code content"
[[ ${REPLY:0:4} = ' ' ]] || Unlinted "No four spaces before code"
val=${REPLY:4}
# Value: convert {{value}}
val=${val//\{\{/$CX$V}
val=${val//\}\}/$XV$C}
Out "$CNL$CSP$C$val$XC" ;;
'`') ((newfmt)) && Unlinted "Bad first character"
((${#REPLY} <= 2)) && Unlinted "No valid code content"
[[ ! ${REPLY: -1} = '`' ]] && Unlinted "Code doesn't end in backtick"
val=${REPLY:1:${#REPLY}-2}
# Value: convert {{value}}
val=${val//\{\{/$CX$V}
val=${val//\}\}/$XV$C}
Out "$CNL$CSP$C$val$XC" ;;
'') continue ;;
*) ((newfmt)) || Unlinted "Bad first character"
[[ -z $REPLY ]] && Unlinted "No example content"
Out "$ENL$ESP$E$REPLY$XE" ;;
esac
done <"$1"
[[ $TLDR_LESS = 0 ]] &&
trap 'cat <<<"$stdout"' EXIT ||
trap 'less -Gg -~RXQFP"%pB\% tldr $I$page$XI - browse up/down, press Q to exit" <<<"$stdout"' EXIT
}
# $1: exit code; Uses: platform index
List_pages(){
local ptext pregex=$platform
[[ $platform ]] && ptext="platform $I$platform$XI" ||
pregex=^ ptext="${I}all$XI platforms"
if [[ $platform = current ]]
then [[ $os ]] &&
pregex="-e $os -e common" ptext="$I$os$XI platform and ${I}common$XI" ||
pregex=common ptext="platform not detected, ${I}common$XI"
fi
Inf "Known tldr pages from $ptext:"
Out "$(tr '{' '\n' <"$index" |grep '^"name"' |grep $pregex |
cut -d "$Q" -f4 |column)"
exit "$1"
}
# $1: regex(es); Uses: cachedir
Find_regex(){
local regex=$* list=$cachedir/*/*/*.md
while (($#))
do
list=$(grep "$1" $list |cut -d: -f1)
shift
done
n=$(wc -l <<<"$list")
list=$(sort -u <<<"$list")
[[ -z $list ]] && Err "Regex $U$regex$XU not found" && exit 6
local t=$(wc -l <<<"$list")
if ((t==1))
then
Display_tldr "$list"
else
Inf "Regex $U$regex$XU $I$n$XI times found in these $I$t$XI tldr pages:"
Out "$(sed -e 's@.*/@@' -e 's@...$@@' <<<"$list" |column)"
fi
exit 0
}
# $1: exit code; Uses: dl cachedir zip_url
Cache_fill(){
updated=0
local tmp unzip
! unzip="$(type -P unzip) -q" &&
Err "tldr requires ${I}unzip$XI to fill the cache" &&
exit 7
tmp=$(mktemp -d)
if ! $dl "$tmp/pages.zip" "$zip_url"
then
rm -- "$tmp" || Err "Error deleting temporary directory $tmp"
Err "Could not download pages archive from $U$zip_url$XU with $dl"
exit 8
fi
if ! $unzip "$tmp/pages.zip" -d "$tmp"
then
rm -- "$tmp" || Err "Error deleting temporary directory $tmp"
Err "Couldn't unzip the cache archive on $tmp/pages.zip"
exit 9
fi
rm -rf -- "${cachedir:?}/"*
mv -- "$tmp/index.json" "$tmp"/pages* "${cachedir:?}/"
rm -rf -- "$tmp"
Inf "Pages cached in $U$cachedir$XU"
updated=1
}
# $@: commandline parameters; Uses: version cached; Sets: platform page
Main(){
local markdown=0 err=0 nomore='Arguments ignored: '
Config
case "$1" in
-s|--search) [[ -z $2 ]] && Err "Search term(s) [regex] needed" && Usage 10
shift
Find_regex "$@" ;;
-l|--list)
if [[ $2 ]]
then
platform=$2
[[ $platform == *,* ]] && Err "No commma allowed, just one platform" &&
Usage 11
[[ ,$platforms,all,current, != *,$platform,* ]] &&
Err "Unknown platform $I$platform$XI" && Usage 12
[[ $platform = all ]] && platform=
shift 2
[[ $1 ]] && Err "$nomore$*" && err=13
fi
List_pages "$err" ;;
-a|--list-all) shift
[[ $1 ]] && Err "$nomore$*" && err=14
platform=current
List_pages $err ;;
-u|--update) shift
[[ $1 ]] && Err "$nomore$*" && err=15
((updated)) || Cache_fill
exit "$err" ;;
-v|--version) shift
[[ $1 ]] && Err "$nomore$*" && err=16
Inf "$ver"
exit "$err" ;;
-r|--render)[[ -z $2 ]] && Err "Specify a file to render" && Usage 17
file=$2
shift 2
[[ $1 ]] && Err "$nomore$*" && err=18
if [[ -f "$file" ]]
then
Display_tldr "$file" && exit "$err"
Err "A file error occured"
exit 19
else
Err "No file: ${I}$2$XI"
exit 20
fi ;;
-m|--markdown) shift
page=$*
[[ -z $page ]] && Err "Specify a page to display" && Usage 21
[[ -f "$page" && ${page: -3:3} = .md ]] && Out "$(cat "$page")" && exit 0
markdown=1 ;;
''|-h|-\?|--help) [[ $2 ]] && Err "$nomore" && err=22
Usage "$err" ;;
-*) Err "Unrecognized option $I$1$XI"; Usage 23 ;;
*) page=$* ;;
esac
[[ -z $page ]] && Err "No command specified" && Usage 24
[[ $page = *' '-* ]] && Err "No options after page allowed" && Usage 25
[[ $page = */* ]] && platform=${page%/*} && page=${page##*/}
[[ $platform == *,* ]] && Err "No comma allowed in platform" && Usage 26
[[ $platform && ,$platforms,all,current, != *,$platform,* ]] &&
Err "Unknown platform $I$platform$XI" &&
Usage 27
[[ $platform = all ]] && platform=
Get_tldr "${page// /-}"
if [[ -s $cached ]]
then # File present
((markdown)) && Out "$(cat "$cached")" || Display_tldr "$cached"
elif [[ ! $lang = en ]]
then # Not English and no file
pages=pages
Get_tldr "${page// /-}"
[[ -s $cached ]] &&
Err "tldr page for command $I$page$XI not found in '$lang' but found in English" &&
((markdown)) && Out "$(cat "$cached")" ||
Display_tldr "$cached"
else # Just not found
Err "tldr page for command $I$page$XI not found" &&
Inf "Contribute new pages at:$XB ${URL}https://github.com/tldr-pages/tldr$XURL" && exit 28
fi
}
export LC_ALL=en_US.UTF-8
Main "$@"
# The exit trap will output the accumulated stdout
exit 0