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bin/tldr

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#!/usr/bin/env bash
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set +vx -o pipefail
[[ $- = *i* ]] && echo "Don't source this script!" && return 1
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version='0.36'
# tldr-bash-client version 0.36
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# Bash client for tldr: community driven man-by-example
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# - forked from Ray Lee, https://github.com/raylee/tldr
# - modified and expanded by pepa65: https://github.com/pepa65/tldr-bash-client
# - binary download: http://4e4.win/tldr
# Requiring: coreutils, grep, unzip, curl/wget, less (optional)
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# The 5 elements in TLDR markup that can be styled with these colors and
# backgrounds (last one specified will be used) and modes (more can apply):
# Colors: Black, Red, Green, Yellow, Blue, Magenta, Cyan, White
# BG: BlackBG, RedBG, GreenBG, YellowBG, BlueBG, MagentaBG, CyanBG, WhiteBG
# Modes: Bold, Underline, Italic, Inverse
# 'Newline' can be added to the style list to add a newline before the element
# and 'Space' to add a space at the start of the line
# (style items are separated by space, lower/uppercase mixed allowed)
: "${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:= 60 }"
# Alternative location of pages cache
: "${TLDR_CACHE:= }"
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# Usage of 'less' or 'cat' for output (set to '0' for cat)
: "${TLDR_LESS:= }"
## Function definitions
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# $1: [optional] exit code; Uses: version cachedir
Usage(){
Out "$(cat <<-EOF
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$HHE$version
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$HDEUSAGE: $HHE$(basename "$0")$XHHE [${HOP}option$XHOP] [${HPL}platform$XHPL/]${HCO}command$XHCO
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$HDE[${HPL}platform$XHPL/]${HCO}command$XHCO: Show page for ${HCO}command$XHCO (from ${HPL}platform$XHPL)
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${HPL}platform$XHPL (optional) one of: ${HPL}common$XHPL, ${HPL}linux$XHPL, ${HPL}osx$XHPL, ${HPL}sunos$XHPL, ${HPL}current$XHPL (includes common)
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${HOP}option$XHOP is optionally one of:
$HOP-l$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 current platform + common
$HOP-r$XHOP, $HOP--render$XHOP ${HFI}file$XHFI: Render a local ${HFI}file$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 repo archive
$HOP-v$XHOP, $HOP--version$XHOP: Version number and local repo location
$HDE[$HOP-h$XHOP, $HOP-?$XHOP, $HOP--help$XHOP]: This help overview
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${HDE}Element styling:$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}By default, the cached copies will be freshly downloaded after $HUR${TLDR_EXPIRY// /}$XHUR days.
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EOF
)"
exit "${1:-0}"
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}
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# $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]:-}$XSTYLES
done
}
# Sets: color xcolor bg xbg mode xmode
Init_term(){
[[ -t 2 ]] && { # only if interactive session (stderr open)
B=$'\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
[[ $TERM != *-m ]] && {
BLA=$'\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' # $(tput op)
}
}
declare -A color=(['black']=$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
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}
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# $1: page
Recent(){ find "$1" -mtime -"${TLDR_EXPIRY// /}" >/dev/null 2>&1;}
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# Initialize globals, check the environment; Uses: config cachedir version
# Sets: stdout os version dl
Config(){
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type -p less >/dev/null || TLDR_LESS=0
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os=common stdout='' Q='"' N=$'\n'
case "$(uname -s)" in
Darwin) os='osx' ;;
Linux) os='linux' ;;
SunOS) os='sunos' ;;
esac
Init_term
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[[ $TLDR_LESS = 0 ]] &&
trap 'cat <<<"$stdout"' EXIT ||
trap 'less -~RXQFP"Browse up/down, press Q to exit " <<<"$stdout"' EXIT
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version="tldr-bash-client version $version$XB ${URL}http://github.com/pepa65/tldr-bash-client$XURL"
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# Select download method
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dl="$(type -p curl) -sLfo" || {
dl="$(type -p wget) --max-redirect=20 -qNO" || {
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Err "tldr requires ${I}curl$XI or ${I}wget$XI installed in your path"
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exit 3
}
}
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pages_url='https://raw.githubusercontent.com/tldr-pages/tldr/master/pages'
zip_url='http://tldr.sh/assets/tldr.zip'
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read cachedir <<<$TLDR_CACHE
[[ $cachedir ]] || {
[[ $XDG_DATA_HOME ]] && cachedir=$XDG_DATA_HOME/tldr \
|| cachedir=$HOME/.local/share/tldr
}
[[ -d "$cachedir" ]] || mkdir -p "$cachedir" || {
Err "Can't create the pages cache location $cachedir"
exit 4
}
index=$cachedir/index.json
# update if the file doesn't exists, or if it's older than $TLDR_EXPIRY
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[[ -f $index ]] && Recent "$index" || Cache_fill 0
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}
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# $1: error message; Uses: md REPLY ln
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Unlinted(){
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Err "Page $I$md$XI not properly linted!$N${ERRSP}${ERR}Line $I$ln$XI [$XERR$U$REPLY$XU$ERR]$N$ERRSP$ERR$1"
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exit 5
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}
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# $1: page; Uses: index cachedir pages_url platform os dl cached md
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# Sets: cached md
Get_tldr(){
local desc err notfound
# convert the local platform name to tldr's version
# extract the platform key from index.json, return preferred subpath to page
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desc=$(tr '{' '\n' <"$index" |grep "\"name\":\"$1\"")
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# results in, eg, "name":"netstat","platform":["linux","osx"]},
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[[ $desc ]] || return # nothing found
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error=0
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if [[ $platform ]]
then # platform given on commandline
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[[ ! $desc =~ \"$platform\" ]] && notfound=$I$platform$XI && error=1 || md=$platform/$1.md
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else # check common
[[ $desc =~ \"common\" ]] && md=common/$1.md || { # not in common either
[[ $notfound ]] && notfound+=" or "
notfound+=${I}common$XI
}
fi
# if no page found yet, try the system platform
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[[ $md ]] || [[ $platform = $os ]] || {
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[[ $desc =~ \"$os\" ]] && md=$os/$1.md
} || {
notfound+=" or $I$os$XI"
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error=1
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}
# if still no page found, get the first entry in index
[[ $md ]] || md=$(cut -d "$Q" -f 8 <<<"$desc")/"$1.md"
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((error)) && Err "tldr page $I$1$XI not found in $notfound, from platform $U${md%/*}$XU instead"
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# return the local cached copy of the tldrpage, or retrieve and cache from github
cached=$cachedir/$md
Recent "$cached" || {
mkdir -p "${cached%/*}"
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$dl "$cached" "$pages_url/$md" || Err "Could not download page $I$cached$XI with $dl"
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}
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}
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# $1: text; Uses: page stdout; Sets: ln REPLY
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Display_tldr(){
local newfmt len val
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ln=0 REPLY=''
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[[ $md ]] || md=$1
# Read full lines, and process even when no newline at the end
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while read -r || [[ $REPLY ]]
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do
((++ln))
((ln==1)) && {
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[[ ${REPLY:0:1} = '#' ]] && newfmt=0 || newfmt=1
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((newfmt)) && {
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[[ $REPLY ]] || Unlinted "Empty title"
Out "$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))
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}
}
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case "${REPLY:0:1}" in # first character
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'#') ((newfmt)) && Unlinted "Bad first character"
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((${#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"
[[ ! ${REPLY: -1} = '.' ]] && Unlinted "Description doesn't end in full stop"
Out "$DNL$DSP$D${REPLY:2}$XD"
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DNL='' ;;
'-') ((newfmt)) && Unlinted "Bad first character"
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((${#REPLY} <= 2)) && Unlinted "No example content"
[[ ! ${REPLY:1:1} = ' ' ]] && Unlinted "2nd character no space"
Out "$ENL$ESP$E${REPLY:2}$XE" ;;
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' ') ((newfmt)) || Unlinted "Bad first character"
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((${#REPLY} <= 4)) && Unlinted "No valid code content"
[[ ${REPLY:0:4} = ' ' ]] || Unlinted "No four spaces before code"
val=${REPLY:4}
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# Value: convert {{value}}
val=${val//\{\{/$CX$V}
val=${val//\}\}/$XV$C}
Out "$CNL$CSP$C$val$XC" ;;
'`') ((newfmt)) && Unlinted "Bad first character"
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((${#REPLY} <= 2)) && Unlinted "No valid code content"
[[ ! ${REPLY: -1} = '`' ]] && Unlinted "Code doesn't end in backtick"
val=${REPLY:1:${#REPLY}-2}
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# Value: convert {{value}}
val=${val//\{\{/$CX$V}
val=${val//\}\}/$XV$C}
Out "$CNL$CSP$C$val$XC" ;;
'') continue ;;
*) ((newfmt)) || Unlinted "Bad first character"
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[[ -z $REPLY ]] && Unlinted "No example content"
Out "$ENL$ESP$E$REPLY$XE" ;;
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esac
done <"$1"
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[[ $TLDR_LESS = 0 ]] &&
trap 'cat <<<"$stdout"' EXIT ||
trap 'less -Gg -~RXQFP"%pB\% tldr $I$page$XI - browse up/down, press Q to exit" <<<"$stdout"' EXIT
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}
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# $1: exit code; Uses: platform index
List_pages(){
local platformtext c1 c2 c3
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[[ $platform ]] && platformtext="platform $I$platform$XI" ||
platform=^ platformtext="${I}all$XI platforms"
[[ $platform = current ]] && platform="-e $os -e common" &&
platformtext="$I$os$XI platform and ${I}common$XI"
Inf "Known tldr pages from $platformtext:"
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Out "$(while read -r c1 c2 c3; do printf "%-19s %-19s %-19s %-19s$N" $c1 $c2 $c3; done \
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<<<$(tr '{' '\n' <"$index" |grep $platform |cut -d "$Q" -f4))"
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exit "$1"
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}
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# $1: exit code; Uses: dl cachedir zip_url
Cache_fill(){
local tmp unzip
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unzip="$(type -p unzip) -q" || {
Err "Unzip is necessary to fill the cache"
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exit 6
}
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tmp=$(mktemp -d)
$dl "$tmp/pages.zip" "$zip_url" || {
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rm -- "$tmp"
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Err "Could not download pages archive from $U$zip_url$XU with $dl"
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exit 7
}
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$unzip "$tmp/pages.zip" -d "$tmp" 'pages/*' || {
rm -- "$tmp"
Err "Couldn't unzip the cache archive on $tmp/pages.zip"
exit 8
}
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rm -rf -- "${cachedir:?}/"*
mv -- "$tmp/pages/"* "${cachedir:?}/"
rm -rf -- "$tmp"
Inf "Pages cached in $U$cachedir$XU"
exit "$1"
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}
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# $@: commandline parameters; Uses: version cached; Sets: platform page
Main(){
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local markdown err nomore='No more command line arguments allowed'
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Config
markdown=0 err=0
case "$1" in
-l|--list) [[ $2 ]] && {
platform=$2
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[[ ,common,linux,osx,sunos,current, = *,$platform,* ]] || {
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Err "Unknown platform $I$platform$XI"
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Usage 9
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}
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[[ $3 ]] && Err "$nomore" && err=10
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}
List_pages "$err" ;;
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-a|--list-all) [[ $2 ]] && Err "$nomore" && err=11
platform=current
List_pages $err ;;
-u|--update) [[ $2 ]] && Err "$nomore" && err=12
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Cache_fill "$err" ;;
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-v|--version) [[ $2 ]] && Err "$nomore" && err=13
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Inf "$version"
exit "$err" ;;
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-r|--render) [[ -z $2 ]] && Err "Specify a file to render" && Usage 14
[[ $3 ]] && Err "$nomore" && err=15
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[[ -f "$2" ]] && {
Display_tldr "$2" && exit "$err"
Err "A file error occured"
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exit 16
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} || Err "No file: ${I}$2$XI" && exit 17 ;;
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-m|--markdown) shift
page=$*
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[[ -z $page ]] && Err "Specify a page to display" && Usage 18
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[[ -f "$page" && ${page: -3:3} = .md ]] && Out "$(cat "$page")" && exit 0
markdown=1 ;;
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''|-h|-\?|--help) [[ $2 ]] && Err "$nomore" && err=19
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Usage "$err" ;;
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-*) Err "Unrecognized option $I$1$XI"; Usage 20 ;;
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*) page=$* ;;
esac
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[[ -z $page ]] && Err "No command specified" && Usage 21
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[[ ${page:0:1} = '-' || $page = *' '-* ]] && Err "Only one option allowed" && Usage 22
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[[ $page = */* ]] && platform=${page%/*} && page=${page##*/}
[[ $platform && ,common,linux,osx,sunos, != *,$platform,* ]] && {
Err "Unknown platform $I$platform$XI"
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Usage 23
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}
Get_tldr "${page// /-}"
[[ ! -s $cached ]] && Err "tldr page for command $I$page$XI not found" \
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&& Inf "Contribute new pages at:$XB ${URL}https://github.com/tldr-pages/tldr$XURL" && exit 24
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((markdown)) && Out "$(cat "$cached")" || Display_tldr "$cached"
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}
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Main "$@"
# The error trap will output the accumulated stdout
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exit 0