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  1. 1 Batch download code snippets

Batch download code snippets

to shell osx mac curl bash unix code web download internet batch ed getopts snippets trap by jvs on Nov 12, 2008
Batch download snippets from http://codesnippets.joyent.com and convert them to text files using man textutil (available on Mac OS X 10.4 or later).

Note: Old snippet versions will be automatically replaced by the downloaded snippets without a backup!

Author: jv
License: The MIT License, Copyright (c) 2008 jv

Usage:
# usage: bds [-p num] [-t tag] [-u user] tag
bds vim
bds -p 1280
bds -u jvs
bds -t plistbuddy
bds -t tar
bds -t ipfw -u jvs




#!/opt/local/bin/bash

# "batch download snippets" from http://codesnippets.joyent.com and
# convert them to text files using man textutil (available on Mac OS X 10.4 or later).
#
# Note: Old snippet versions will be automatically replaced by the downloaded snippets without a backup!
#      An alternative to man textutil is html2text, http://www.mbayer.de/html2text/ (which is available via MacPorts).
#
# Author: jv
# License: The MIT License, http://www.opensource.org/licenses/mit-license.php
# Copyright (c) 2008 jv
#
# cat /usr/local/bin/bds
#
# usage: bds [-p num] [-t tag] [-u user] tag


declare BaseURL='http://codesnippets.joyent.com'
declare download_dir="${HOME}/Desktop/Snippets"

# make sure there is no trailing slash
BaseURL="${BaseURL%/}"
download_dir="${download_dir%/}"

declare BasePostURL="${BaseURL}/posts/show"
declare BaseTagURL="${BaseURL}/tag"
declare BaseUserURL="${BaseURL}/user"

# make sure there is no trailing slash
BasePostURL="${BasePostURL%/}"
BaseTagURL="${BaseTagURL%/}"
BaseUserURL="${BaseUserURL%/}"


# man textutil
declare InputEncoding='utf-8'
declare OutputEncoding='utf-8'

export IFS=$' \t\n'


# function to download a single post specified by a post number: bds -p num
# cf. snippet, http://codesnippets.joyent.com/posts/show/1282

function snippet() {

   declare NL OPWD file outputfile postnum title url

   if [[ "${1//[[:digit:]]/}" != "" ]]; then echo "Argument error. No positive integer: ${1}"; return 1; fi

   postnum="${1}"
   url="${BasePostURL}/${postnum}"
   download_dir="${download_dir}/single-downloads"
   /bin/mkdir -p "${download_dir}"
   OPWD="${PWD}"
   cd "${download_dir}"
   /usr/bin/curl -L -O -s --max-time 25 "${url}" || exit 1    # download snippet web page
   file="${download_dir}/${url##*/}"
   trap '/bin/rm -f "${file}"; exit 0' 0 1 2 13 15

   # get title of downloaded web page
   #title="$(/usr/bin/sed -E -n -e '/<[tT][iI][tT][lL][eE]>/{s/^.*<[tT][iI][tT][lL][eE]>(.*)<\/[tT][iI][tT][lL][eE]>.*$/\1/p;q;}' "${file}" | \
   #         /usr/bin/sed -E -e 's/\[[^][:space:]]*\]//g')"    # delete [xxx] tag elements of title

   title="$(/usr/bin/egrep -m 1 -io '<title>.*</title>' "${file}" | /usr/bin/sed -E -e 's/^<title>[[:space:]]*|[[:space:]]*<\/title>$//g' \
             -e 's/\[[^][:space:]]*\]//g')"    # delete [xxx] tag elements of title


   title="${title//CodeSnippets:/}"
   title="${title//\//:}"
   title="${title// /_}"
   title="${title//[[:cntrl:]]/}"
   title="${title%"${title##*[!_]}"}"   # remove trailing underscores

   if [[ $title == '_CodeDrive_Snippets_courtesy_of_Peter_Coopers_handy_little_app' ]] || [[ -z "$title" ]]; then
      printf "\e[0K\e[31m%s\e[0m:  %s\n" "couldn't access" "${url}"
      /bin/rm "${file}"
      return 1
   fi

   outputfile="${download_dir}/${postnum}_${title}.txt"
   #outputfile="${download_dir}/${title}.txt"  # without post number prefix
   #outputfile="${outputfile//__/_}"  # uniq underscores

   printf "\n\e[0K\e[1;30m%s\e[0m:  %s\n\n" "saved as" "${outputfile}"

   /usr/bin/textutil -output "${outputfile}" -convert txt -inputencoding "${InputEncoding}" -encoding "${OutputEncoding}" "${file}"
   /bin/rm "${file}"

   # escape backslashes
   # man bash 2>/dev/null | less -p 'Each command in a pipeline'
   #outputfile="$(printf "%q" "${outputfile}")"  # cf. help printf
   outputfile="${outputfile//\\/\\\\}"

   NL=$'\\\n'

cat <<EOF | /bin/ed -s "${outputfile}"
H
,g/Snippets is a public source code repository/1,/Snippets is a public source code repository/d
,g/You need to create an account or log in to post comments to this site//You need to create an account or log in to post comments to this site/,\$d
,g|(See related posts)$|s|.See related posts.|${NL}${NL}|
,g|^to.* by.* on .*[[:digit:]]$|s|^to\(.*\) by\(.*\) on \(.*[[:digit:]]\)$|${NL}${NL}Author:\2${NL}Date: \3${NL}URL: ${url}${NL}Tags:\1${NL}|
,g|^Comments on this post$|s|\(Comments on this post\)|${NL}\1:|
,g| posts on .* at |s|\(.* posts on .* at .*\)|${NL}\1:|
w
EOF

# additional ed commands
# delete line numbers
# ,g|^[[:space:]]*[[:digit:]]\{1,\}[[:space:]]\{1,3\}|s|^[[:space:]]*[[:digit:]]\{1,\}[[:space:]]\{1,3\}\(.*\)$|\1|
# delete range of lines
# 4,11d


   cd "${OPWD}"
   return 0

}



#----------------------------------------- end of function snippet



declare pflag tflag uflag
declare cnt count dir_name file no_posts_check NL OPWD outputfile postnum tagsite title url urls website 

if [[ $# -eq 0 ]]; then 
   printf "%s\n%s\n" 'No arguments given!' "Usage: ${0##*/} [-p num] [-t tag] [-u user] tag" 1>&2
   exit 1
fi


while getopts ":p:t:u:" option
do
  case $option in
    p) pflag="$OPTARG" ;;
    t) tflag="$OPTARG" ;;
    u) uflag="$OPTARG" ;;
    [?]) printf "%s\n%s\n" 'Argument error!' "Usage: ${0##*/} [-p num] [-t tag] [-u user] tag" 1>&2; exit 1;;
    *) ;;
  esac
done

shift $(($OPTIND - 1))


if [[ $# -eq 1 ]]; then

   dir_name="${1}"
   tagsite="${BaseTagURL}/${1}"

elif [[ $# -gt 1 ]]; then

   printf "%s\n%s\n" 'Too many arguments!' "Usage: ${0##*/} [-p num] [-t tag] [-u user] tag" 1>&2
   exit 1

elif [[ -n "${pflag}" ]]; then
   snippet "${pflag}"
   exit 0

elif [[ -n "${tflag}" ]] && [[ -n "${uflag}" ]]; then

   dir_name="${tflag}-${uflag}"
   tagsite="${BaseUserURL}/${uflag}/tag/${tflag}"

elif [[ -n "${tflag}" ]]; then

   dir_name="${tflag}"
   tagsite="${BaseTagURL}/${tflag}"

elif [[ -n "${uflag}" ]]; then

   dir_name="${uflag}"
   tagsite="${BaseUserURL}/${uflag}"

else

   printf "%s\n%s\n" 'Argument error!' "Usage: ${0##*/} [-p num] [-t tag] [-u user] tag" 1>&2
   exit 1

fi


tagsite="${tagsite%/}"

#echo $dir_name
#echo $tagsite

count=1
cnt=0
curl_max_time=20
website=''
no_posts_check=''
NL=$'\\\n'
download_dir="${download_dir}/${dir_name//\//:}"
download_dir="${download_dir%/}"
/bin/mkdir -p "${download_dir}"
OPWD="${PWD}"
cd "${download_dir}"

# print download directory
printf "\n\e[0K\e[1;30m%s\e[0m:  %s\n\n" "download directory" "${download_dir}"


while [[ -z "${no_posts_check}" ]]; do

   # download website of the form: 
   # http://somewebsite.com/tag/bash/1,
   # http://somewebsite.com/user/name/1 or 
   # http://somewebsite.com/user/name/tag/bash/1

   website="$(/usr/bin/curl -L -s --max-time $curl_max_time "${tagsite}/${count}" )"

   if [[ $? -ne 0 ]]; then 
      printf "\e[0K\e[31m%s\e[0m:  %s\n" "curl_max_time ${curl_max_time}" "${tagsite}/${count}"
      exit 1
   fi

   #if [[ -n "$(printf "%s" "${website}" | /usr/bin/egrep -o 'Application error \(Apache\)')" ]]; then 
      #no_posts_check='Application error (Apache)'
      #printf "\e[0K\e[31m%s\e[0m:  %s\n" "no further posts" "${no_posts_check}"
   #fi

   if [[ -n "$(printf "%s" "${website}" | /usr/bin/egrep -o '>No posts<')" ]]; then 
      no_posts_check='>No posts<'
      #printf "\e[0K\e[31m%s\e[0m:  %s\n" "no further posts" "${no_posts_check}"
   fi

: <<-'COMMENT'

   # works for Bash 3.0 or later
   if [[ "${website}" =~ '>No posts<' ]]; then 
      no_posts_check="${BASH_REMATCH[0]}"
      #printf "\e[0K\e[31m%s\e[0m:  %s\n" "no further posts" "${no_posts_check}"
   fi

COMMENT


   if [[ -z "${no_posts_check}" ]]; then

      # extract relevant post URLs
      #urls=( $(printf "%s\n" "${website}" | /usr/bin/sed -E -n -e "s|^.* href=\"(/posts/show/[[:digit:]]+)\".*$|${BaseURL}\1|p;g") )
      urls=( $(printf "%s\n" "${website}" | /usr/bin/egrep -o 'href="/posts/show/[[:digit:]]+"' | /usr/bin/sed -E -n -e "s|href=\"(/posts/show/[[:digit:]]+)\"|${BaseURL}\1|p;g") )

      for ((i=0; i < "${#urls[@]}"; i++)); do

         url="${urls[${i}]}"

         postnum="${url##*/}"
         file="${download_dir}/${postnum}"
         trap '/bin/rm -f "${file}"; exit 0' 0 1 2 13 15

         /usr/bin/curl -L -O -s --max-time $curl_max_time "${url}"

         if [[ $? -ne 0 ]]; then 
            printf "\e[0K\e[31m%s\e[0m:  %s\n" "curl_max_time ${curl_max_time}" "${url}"
            continue
         fi
 

         # get title of downloaded web page
         #title="$(/usr/bin/sed -E -n -e '/<[tT][iI][tT][lL][eE]>/{s/^.*<[tT][iI][tT][lL][eE]>(.*)<\/[tT][iI][tT][lL][eE]>.*$/\1/p;q;}' "${file}" | \
         #    /usr/bin/sed -E -e 's/\[[^][:space:]]*\]//g')"    # delete [xxx] tag elements of title

         title="$(/usr/bin/egrep -m 1 -io '<title>.*</title>' "${file}" | /usr/bin/sed -E -e 's/^<title>[[:space:]]*|[[:space:]]*<\/title>$//g' \
                -e 's/\[[^][:space:]]*\]//g')"    # delete [xxx] tag elements of title


         title="${title//CodeSnippets:/}"
         title="${title//\//:}"
         title="${title// /_}"
         title="${title//[[:cntrl:]]/}"
         title="${title%"${title##*[!_]}"}"   # remove trailing underscores

         #printf "%s\n" "${title}"

         if [[ $title == '_CodeDrive_Snippets_courtesy_of_Peter_Coopers_handy_little_app' ]] || [[ -z "$title" ]]; then
            printf "\e[0K\e[31m%s\e[0m:  %s\n" "couldn't access" "${url}"
            /bin/rm "${file}"
            continue
         fi

         outputfile="${download_dir}/${postnum}_${title}.txt"
         #outputfile="${download_dir}/${title}.txt"  # without post number prefix
         #outputfile="${outputfile//__/_}"  # uniq underscores

         let cnt++
         printf "\e[0K\e[1;32m%-6s\e[0m  %s\n" "${cnt}" "${outputfile##*/}"

         /usr/bin/textutil -output "${outputfile}" -convert txt -inputencoding "${InputEncoding}" -encoding "${OutputEncoding}" "${file}"

         /bin/rm "${file}"


         # escape backslashes
         # man bash 2>/dev/null | less -p 'Each command in a pipeline'
         #outputfile="$(printf "%q" "${outputfile}")"  # cf. help printf
         outputfile="${outputfile//\\/\\\\}"

# edit $outputfile in-place with man ed
# first delete lines at the beginning & end,
# then remove the string 'See related posts' and add some newlines with $NL,
# then convert the line 'to...by...on' to line 'Author:...', line 'Date:...', line 'URL:...' and line 'Tags:...'
# and finally the last two ed commands insert two further newlines with $NL

cat <<EOF | /bin/ed -s "${outputfile}"
H
,g/Snippets is a public source code repository/1,/Snippets is a public source code repository/d
,g/You need to create an account or log in to post comments to this site//You need to create an account or log in to post comments to this site/,\$d
,g|(See related posts)$|s|.See related posts.|${NL}${NL}|
,g|^to.* by.* on .*[[:digit:]]$|s|^to\(.*\) by\(.*\) on \(.*[[:digit:]]\)$|${NL}${NL}Author:\2${NL}Date: \3${NL}URL: ${url}${NL}Tags:\1${NL}|
,g|^Comments on this post$|s|\(Comments on this post\)|${NL}\1:|
,g| posts on .* at |s|\(.* posts on .* at .*\)|${NL}\1:|
w
EOF

# additional ed commands
# delete line numbers
# ,g|^[[:space:]]*[[:digit:]]\{1,\}[[:space:]]\{1,3\}|s|^[[:space:]]*[[:digit:]]\{1,\}[[:space:]]\{1,3\}\(.*\)$|\1|
# delete range of lines
# 4,11d


      done  # for

      let count++

   fi

done   # while


   cd "${OPWD}"


exit 0

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On This Page:

  1. 1 Batch download code snippets