mirror of
https://github.com/pepa65/tldr-bash-client.git
synced 2024-11-10 21:26:58 +01:00
a0641078d0
Conform general tldr client specifications: - -u/--update Updates the whole cache (obsoletes update index only) - old -c/--cache now becomes -u/--update - Implement -a/--list-all (same action as newly implemented -l/--list current) Make formatting not include initial space
419 lines
15 KiB
Bash
Executable File
419 lines
15 KiB
Bash
Executable File
#!/usr/bin/env bash
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set +vx -o pipefail
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[[ $- = *i* ]] && echo "Don't source this script!" && return 1
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version='0.34'
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# tldr-bash-client version 0.34
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# Bash client for tldr: community driven man-by-example
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# - forked from Ray Lee, http://github.com/raylee/tldr
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# - modified and expanded by pepa65: http://github.com/pepa65/tldr-bash-client
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# Requiring: coreutils, less, grep, unzip, curl/wget
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# The 5 elements in TLDR markup that can be styled with these colors and
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# backgrounds (last one specified will be used) and modes (more can apply):
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# Colors: Black, Red, Green, Yellow, Blue, Magenta, Cyan, White
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# BG: BlackBG, RedBG, GreenBG, YellowBG, BlueBG, MagentaBG, CyanBG, WhiteBG
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# Modes: Bold, Underline, Italic, Inverse
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# 'Newline' can be added to the style list to add a newline before the element
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# and 'Space' to add a space at the start of the line
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# (style items are separated by space, lower/uppercase mixed allowed)
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: "${TLDR_TITLE_STYLE:= Newline Space Bold Yellow }"
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: "${TLDR_DESCRIPTION_STYLE:= Space Yellow }"
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: "${TLDR_EXAMPLE_STYLE:= Newline Space Bold Green }"
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: "${TLDR_CODE_STYLE:= Space Bold Blue }"
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: "${TLDR_VALUE_ISTYLE:= Space Bold Cyan }"
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# The Value style (above) is an Inline style: doesn't take Newline or Space
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# Inline styles for help text: default, URL, option, platform, command, header
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: "${TLDR_DEFAULT_ISTYLE:= White }"
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: "${TLDR_URL_ISTYLE:= Yellow }"
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: "${TLDR_HEADER_ISTYLE:= Bold }"
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: "${TLDR_OPTION_ISTYLE:= Bold Yellow }"
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: "${TLDR_PLATFORM_ISTYLE:= Bold Blue }"
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: "${TLDR_COMMAND_ISTYLE:= Bold Cyan }"
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: "${TLDR_FILE_ISTYLE:= Bold Magenta }"
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# Color/BG (Newline and Space also allowed) for error and info messages
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: "${TLDR_ERROR_COLOR:= Newline Space Red }"
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: "${TLDR_INFO_COLOR:= Newline Space Green }"
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# How many days before freshly downloading a potentially stale page
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: "${TLDR_EXPIRY:= 60 }"
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# Alternative location of pages cache
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: "${TLDR_CACHE:= }"
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# $1: [optional] exit code; Uses: version cachedir
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Usage(){
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Out "$(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:
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$HOP-l$XHOP, $HOP--list$XHOP [${HPL}platform$XHPL]: List all pages (from ${HPL}platform$XHPL)
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$HOP-a$XHOP, $HOP--list-all$XHOP: List all pages from current platform + common
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$HOP-r$XHOP, $HOP--render$XHOP ${HFI}file$XHFI: Render a local ${HFI}file$XHFI as tldr markdown
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$HOP-m$XHOP, $HOP--markdown$XHOP ${HCO}command$XHCO: Show the markdown source for ${HCO}command$XHCO
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$HOP-u$XHOP, $HOP--update$XHOP: Update the pages cache by downloading repo archive
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$HOP-v$XHOP, $HOP--version$XHOP: Version number and local repo location
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$HDE[$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
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${HDE}All pages and the index are cached locally under $HUR$cachedir$XHUR.
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${HDE}By default, the cached copies will be freshly downloaded after $HUR${TLDR_EXPIRY// /}$XHUR days.
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EOF
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)"
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exit "${1:-0}"
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}
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# $1: keep output; Uses/Sets: stdout
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Out(){ stdout+=$1$N;}
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# $1: keep error messages
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Err(){ Out "$ERRNL$ERRSP$ERR$B$1$XB$XERR";}
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# $1: keep info messages
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Inf(){ Out "$INFNL$INFSP$INF$B$1$XB$XINF";}
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# $1: Style specification; Uses: color xcolor bg xbg mode xmode
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Style(){
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local -l style
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STYLES='' XSTYLES='' COLOR='' XCOLOR='' NL='' SP=''
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for style in $1
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do
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[[ $style = newline ]] && NL=$N
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[[ $style = space ]] && SP=' '
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COLOR+=${color[$style]:-}${bg[$style]:-}
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XCOLOR=${xbg[$style]:-}${xcolor[$style]:-}$XCOLOR
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STYLES+=${color[$style]:-}${bg[$style]:-}${mode[$style]:-}
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XSTYLES=${xmode[$style]:-}${xbg[$style]:-}${xcolor[$style]:-}$XSTYLES
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done
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}
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# Sets: color xcolor bg xbg mode xmode
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Init_term(){
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[[ -t 2 ]] && { # only if interactive session (stderr open)
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B=$'\e[1m' # $(tput bold || tput md) # Start bold
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XB=$'\e[0m' # End bold (no tput code...)
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U=$'\e[4m' # $(tput smul || tput us) # Start underline
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XU=$'\e[24m' # $(tput rmul || tput ue) # End underline
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I=$'\e[3m' # $(tput sitm || tput ZH) # Start italic
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XI=$'\e[23m' # $(tput ritm || tput ZR) # End italic
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R=$'\e[7m' # $(tput smso || tput so) # Start reverse
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XR=$'\e[27m' # $(tput rmso || tput se) # End reverse
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#X=$'\e[0m' # $(tput sgr0 || tput me) # End all
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[[ $TERM != *-m ]] && {
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BLA=$'\e[30m' # $(tput setaf 0 || tput AF 0)
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RED=$'\e[31m' # $(tput setaf 1 || tput AF 1)
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GRE=$'\e[32m' # $(tput setaf 2 || tput AF 2)
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YEL=$'\e[33m' # $(tput setaf 3 || tput AF 3)
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BLU=$'\e[34m' # $(tput setaf 4 || tput AF 4)
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MAG=$'\e[35m' # $(tput setaf 5 || tput AF 5)
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CYA=$'\e[36m' # $(tput setaf 6 || tput AF 6)
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WHI=$'\e[37m' # $(tput setaf 7 || tput AF 7)
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DEF=$'\e[39m' # $(tput op)
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BLAB=$'\e[40m' # $(tput setab 0 || tput AB 0)
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REDB=$'\e[41m' # $(tput setab 1 || tput AB 1)
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GREB=$'\e[42m' # $(tput setab 2 || tput AB 2)
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YELB=$'\e[43m' # $(tput setab 3 || tput AB 3)
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BLUB=$'\e[44m' # $(tput setab 4 || tput AB 4)
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MAGB=$'\e[45m' # $(tput setab 5 || tput AB 5)
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CYAB=$'\e[46m' # $(tput setab 6 || tput AB 6)
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WHIB=$'\e[47m' # $(tput setab 7 || tput AB 7)
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DEFB=$'\e[49m' # $(tput op)
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}
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}
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declare -A color=(['black']=$BLA ['red']=$RED ['green']=$GRE ['yellow']=$YEL \
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['blue']=$BLU ['magenta']=$MAG ['cyan']=$CYA ['white']=$WHI)
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declare -A xcolor=(['black']=$DEF ['red']=$DEF ['green']=$DEF ['yellow']=$DEF \
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['blue']=$DEF ['magenta']=$DEF ['cyan']=$DEF ['white']=$DEF)
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declare -A bg=(['blackbg']=$BLAB ['redbg']=$REDB ['greenbg']=$GREB ['yellowbg']=$YELB \
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['bluebg']=$BLUB ['magentabg']=$MAGB ['cyanbg']=$CYAB ['whitebg']=$WHIB)
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declare -A xbg=(['blackbg']=$DEFB ['redbg']=$DEFB ['greenbg']=$DEFB ['yellowbg']=$DEFB \
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['bluebg']=$DEFB ['magentabg']=$DEFB ['cyanbg']=$DEFB ['whitebg']=$DEFB)
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declare -A mode=(['bold']=$B ['underline']=$U ['italic']=$I ['inverse']=$R)
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declare -A xmode=(['bold']=$XB ['underline']=$XU ['italic']=$XI ['inverse']=$XR)
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# the 5 main tldr page styles and error message colors
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Style "$TLDR_TITLE_STYLE"
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T=$STYLES XT=$XSTYLES TNL=$NL TSP=$SP
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Style "$TLDR_DESCRIPTION_STYLE"
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D=$STYLES XD=$XSTYLES DNL=$NL DSP=$SP
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Style "$TLDR_EXAMPLE_STYLE"
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E=$STYLES XE=$XSTYLES ENL=$NL ESP=$SP
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Style "$TLDR_CODE_STYLE"
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C=$STYLES XC=$XSTYLES CNL=$NL CSP=$SP
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Style "$TLDR_VALUE_ISTYLE"
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V=$STYLES XV=$XSTYLES
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Style "$TLDR_DEFAULT_ISTYLE"
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HDE=$STYLES XHDE=$XSTYLES
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Style "$TLDR_URL_ISTYLE"
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URL=$STYLES XURL=$XSTYLES
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HUR=$XHDE$STYLES XHUR=$XSTYLES$HDE
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Style "$TLDR_OPTION_ISTYLE"
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HOP=$XHDE$STYLES XHOP=$XSTYLES$HDE
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Style "$TLDR_PLATFORM_ISTYLE"
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HPL=$XHDE$STYLES XHPL=$XSTYLES$HDE
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Style "$TLDR_COMMAND_ISTYLE"
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HCO=$XHDE$STYLES XHCO=$XSTYLES$HDE
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Style "$TLDR_FILE_ISTYLE"
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HFI=$XHDE$STYLES XHFI=$XSTYLES$HDE
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Style "$TLDR_HEADER_ISTYLE"
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HHE=$XHDE$STYLES XHHE=$XSTYLES$HDE
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Style "$TLDR_ERROR_COLOR"
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ERR=$COLOR XERR=$XCOLOR ERRNL=$NL ERRSP=$SP
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Style "$TLDR_INFO_COLOR"
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INF=$COLOR XINF=$XCOLOR INFNL=$NL INFSP=$SP
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}
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# $1: page
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Recent(){ find "$1" -mtime -"${TLDR_EXPIRY// /}" >/dev/null 2>&1;}
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# Initialize globals, check the environment; Uses: config cachedir version
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# Sets: stdout os version dl
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Config(){
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os=common stdout='' Q='"' N=$'\n'
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case "$(uname -s)" in
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Darwin) os='osx' ;;
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Linux) os='linux' ;;
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SunOS) os='sunos' ;;
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esac
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Init_term
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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="$(type -p curl) -sLfo" || {
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dl="$(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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}
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}
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base_url='https://raw.githubusercontent.com/tldr-pages/tldr/master/pages'
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zip_url='http://tldr-pages.github.io/assets/tldr.zip'
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read cachedir <<<$TLDR_CACHE
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[[ $cachedir ]] || {
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[[ $XDG_DATA_HOME ]] && cachedir=$XDG_DATA_HOME/tldr \
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|| cachedir=$HOME/.local/share/tldr
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}
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[[ -d "$cachedir" ]] || mkdir -p "$cachedir" || {
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Err "Can't create the pages cache location $cachedir"
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exit 4
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}
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index=$cachedir/index.json
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# 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
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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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# $1: page; Uses: index cachedir base_url platform os dl cached md
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# Sets: cached md
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Get_tldr(){
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local desc err notfound
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# convert the local platform name to tldr's version
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# extract the platform key from index.json, return preferred subpath to page
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desc=$(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 ]]
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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
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[[ $desc =~ \"common\" ]] && md=common/$1.md || { # not in common either
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[[ $notfound ]] && notfound+=" or "
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notfound+=${I}common$XI
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}
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fi
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# 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
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} || {
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notfound+=" or $I$os$XI"
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error=1
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}
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# if still no page found, get the first entry in index
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[[ $md ]] || md=$(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%/*}$XU instead"
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# return the local cached copy of the tldrpage, or retrieve and cache from github
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cached=$cachedir/$md
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Recent "$cached" || {
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mkdir -p "${cached%/*}"
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$dl "$cached" "$base_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(){
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local newfmt len val
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ln=0 REPLY=''
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[[ $md ]] || md=$1
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# 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
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((++ln))
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((ln==1)) && {
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[[ ${REPLY:0:1} = '#' ]] && newfmt=0 || newfmt=1
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((newfmt)) && {
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[[ $REPLY ]] || Unlinted "Empty title"
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Out "$TNL$TSP$T$REPLY$XT"
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len=${#REPLY} # title length
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read -r
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((++ln))
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[[ $REPLY =~ [^=] ]] && Unlinted "Title underline must be equal signs"
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((len!=${#REPLY})) && Unlinted "Underline length not equal to title's"
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read -r
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((++ln))
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}
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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"
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[[ ! ${REPLY:1:1} = ' ' ]] && Unlinted "2nd character no space"
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Out "$TNL$TSP$T${REPLY:2}$XT" ;;
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'>') ((${#REPLY} <= 3)) && Unlinted "No valid desciption"
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[[ ! ${REPLY:1:1} = ' ' ]] && Unlinted "2nd character no space"
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[[ ! ${REPLY: -1} = '.' ]] && Unlinted "Description doesn't end in full stop"
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Out "$DNL$DSP$D${REPLY:2}$XD"
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DNL='' ;;
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'-') ((newfmt)) && Unlinted "Bad first character"
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((${#REPLY} <= 2)) && Unlinted "No example content"
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[[ ! ${REPLY:1:1} = ' ' ]] && Unlinted "2nd character no space"
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Out "$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"
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[[ ${REPLY:0:4} = ' ' ]] || Unlinted "No four spaces before code"
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val=${REPLY:4}
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# Value: convert {{value}}
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val=${val//\{\{/$CX$V}
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val=${val//\}\}/$XV$C}
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Out "$CNL$CSP$C$val$XC" ;;
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'`') ((newfmt)) && Unlinted "Bad first character"
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((${#REPLY} <= 2)) && Unlinted "No valid code content"
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[[ ! ${REPLY: -1} = '`' ]] && Unlinted "Code doesn't end in backtick"
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val=${REPLY:1:-1}
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# Value: convert {{value}}
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val=${val//\{\{/$CX$V}
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val=${val//\}\}/$XV$C}
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Out "$CNL$CSP$C$val$XC" ;;
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'') continue ;;
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*) ((newfmt)) || Unlinted "Bad first character"
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[[ -z $REPLY ]] && Unlinted "No example content"
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Out "$ENL$ESP$E$REPLY$XE" ;;
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esac
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done <"$1"
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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
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List_pages(){
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local platformtext c1 c2 c3
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[[ $platform ]] && platformtext="platform $I$platform$XI" ||
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platform=^ platformtext="${I}all$XI platforms"
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[[ $platform = current ]] && platform="-e $os -e common" &&
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platformtext="$I$os$XI platform and ${I}common$XI"
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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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# $1: exit code; Uses: dl cachedir zip_url
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Cache_fill(){
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local tmp unzip
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unzip="$(type -p unzip) -q" || {
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Err "Unzip is necessary to fill the cache"
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exit 6
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}
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tmp=$(mktemp -d)
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$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 $dl"
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exit 7
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}
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$unzip "$tmp/pages.zip" -d "$tmp" 'pages/*' || {
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rm -- "$tmp"
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Err "Couldn't unzip the cache archive on $tmp/pages.zip"
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exit 8
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}
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rm -rf -- "${cachedir:?}/"*
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mv -- "$tmp/pages/"* "${cachedir:?}/"
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rm -rf -- "$tmp"
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Inf "Pages cached in $U$cachedir$XU"
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exit "$1"
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}
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# $@: commandline parameters; Uses: version cached; Sets: platform page
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Main(){
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local markdown err nomore='No more command line arguments allowed'
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Config
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markdown=0 err=0
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case "$1" in
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-l|--list) [[ $2 ]] && {
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platform=$2
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[[ ,common,linux,osx,sunos, = *,$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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}
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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
|
|
Cache_fill "$err" ;;
|
|
-v|--version) [[ $2 ]] && Err "$nomore" && err=13
|
|
Inf "$version"
|
|
exit "$err" ;;
|
|
-r|--render) [[ -z $2 ]] && Err "Specify a file to render" && Usage 14
|
|
[[ $3 ]] && Err "$nomore" && err=15
|
|
[[ -f "$2" ]] && {
|
|
Display_tldr "$2" && exit "$err"
|
|
Err "A file error occured"
|
|
exit 16
|
|
} || Err "No file: ${I}$2$XI" && exit 17 ;;
|
|
-m|--markdown) shift
|
|
page=$*
|
|
[[ -z $page ]] && Err "Specify a page to display" && Usage 18
|
|
[[ -f "$page" && ${page: -3:3} = .md ]] && Out "$(cat "$page")" && exit 0
|
|
markdown=1 ;;
|
|
''|-h|-\?|--help) [[ $2 ]] && Err "$nomore" && err=19
|
|
Usage "$err" ;;
|
|
-*) Err "Unrecognized option $I$1$XI"; Usage 20 ;;
|
|
*) page=$* ;;
|
|
esac
|
|
|
|
[[ -z $page ]] && Err "No command specified" && Usage 21
|
|
[[ ${page:0:1} = '-' || $page = *' '-* ]] && Err "Only one option allowed" && Usage 22
|
|
[[ $page = */* ]] && platform=${page%/*} && page=${page##*/}
|
|
[[ $platform && ,common,linux,osx,sunos, != *,$platform,* ]] && {
|
|
Err "Unknown platform $I$platform$XI"
|
|
Usage 23
|
|
}
|
|
|
|
Get_tldr "${page// /-}"
|
|
[[ ! -s $cached ]] && 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 24
|
|
((markdown)) && Out "$(cat "$cached")" || Display_tldr "$cached"
|
|
}
|
|
|
|
Main "$@"
|
|
# The error trap will output the accumulated stdout
|
|
exit 0
|