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https://github.com/chubin/cheat.sh.git
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gachikuku
125 lines
3.7 KiB
Bash
Executable File
125 lines
3.7 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Contributed by Erez Binyamin (github.com/ErezBinyamin)
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# Search for an RFC
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# Contrib to chubin - cheat.sh
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RFC_get()
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(
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rfc_describe() {
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sed -ne '/0001/,$p' ${RFC_INDEX} \
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| tr '\n' '#' \
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| sed 's/##/\n/g' \
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| sed 's/# //g' \
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| grep -o '.*\. ' \
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| sed -E 's/^(.*)(January|February|March|April|May|June|July|August|September|October|November|December) [[:digit:]]{4}(.*)$/\1/'
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}
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UNAME=$(uname -s)
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if [ "$UNAME" = "Darwin" ]; then
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SED_I="sed -i ''"
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else
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SED_I="sed -i"
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fi
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mkdir -p /tmp/RFC_get
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local WEB_RESP="/tmp/RFC_get/rfc_get_web_resp_${RANDOM}.html"
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local RFC_INDEX="/tmp/RFC_get/rfc_index.html"
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local isNum='^[0-9]+$'
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# Update RFC_INDEX if file does not exist
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[ -f ${RFC_INDEX} ] || curl 'https://www.ietf.org/download/rfc-index.txt' 2>/dev/null > ${RFC_INDEX}
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local MIN_RFC=1
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local MAX_RFC=$(sed '/^ / d' ${RFC_INDEX} | tail -n 1 | sed 's/ .*//')
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local arg_lower=$(echo "$1" | tr '[:upper:]' '[:lower:]')
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# Syntax check Usage statement
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if [ $# -lt 1 ] || [ "$arg_lower" = "-h" ] || [ "$arg_lower" = "--help" ] || [ "$arg_lower" = ":help" ] || [ "$arg_lower" = ":usage" ]
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then
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printf "
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USAGE:
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rfc <RFC_number> Search RFC by number
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rfc <Topic_string> Search RFC by topic
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rfc :list List available RFC's
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rfc :usage Show this help message
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\n"
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return 0
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fi
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# Get corresponding RFC by number
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if [[ ${1} =~ $isNum ]]
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then
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# Validate RFC range
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if [ "$1" -gt $MAX_RFC ] || [ "$1" -lt $MIN_RFC ]
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then
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echo "Valid RFC numbers: [ ${MIN_RFC} - ${MAX_RFC} ]"
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return 1
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fi
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# If valid N: Retrieve RFC <N>
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curl "https://www.ietf.org/rfc/rfc${1}.txt" --write-out %{http_code} --silent --output ${WEB_RESP} 2>/dev/null | grep -q '200'
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if [ $? -ne 0 ]
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then
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# Attempt to retrieve PDF link to RFC <N>
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curl "https://www.rfc-editor.org/info/rfc${1}" --write-out %{http_code} --silent --output ${WEB_RESP} 2>/dev/null | grep -q '200'
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# Webpage error code (Not 200 OK)
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if [ $? -ne 0 ]
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then
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echo "Error retrieving https://www.rfc-editor.org/info/rfc${1}"
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echo "Please create github issue at https://github.com/chubin/cheat.sh/issues"
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return 2
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# RFC never issued
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elif grep -q '<h2>Not Issued</h2>' ${WEB_RESP}
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then
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echo "RFC ${1} was never issued"
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return 0
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# RFC does not exist
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elif grep -q 'does not exist</h3>' ${WEB_RESP}
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then
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echo "RFC ${1} does not exist"
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return 0
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# RFC exists only as PDF
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elif grep -q 'https.*\.pdf' $WEB_RESP
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then
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grep -o 'https.*\.pdf' $WEB_RESP
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return 0
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# Unknown error
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else
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echo "Error retrieving RFC $1"
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echo "Please create github issue at https://github.com/chubin/cheat.sh/issues"
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return 2
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fi
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fi
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# Print list of available RFCs
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elif [ "$arg_lower" = ":list" ]
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then
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# Format RFC_INDEX to show short description of each RFC
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rfc_describe \
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| grep -v 'Not Issued' \
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| sed 's/ .*//; s/^0*//'
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return 0
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# Print list of available RFCs
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elif [ "$arg_lower" = ":describe" ]
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then
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# Format RFC_INDEX to show short description of each RFC
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rfc_describe
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return 0
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# Format list of RFCs related to keyword: RFC_N RFC_Title
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else
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ARG="$*"
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rfc_describe \
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| grep -i "$ARG" \
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> $WEB_RESP
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fi
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# Format nicely and print
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$SED_I -e '/Page [0-9]/,+2d; /page [0-9]/,+2d' ${WEB_RESP}
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if grep -q '<!DOCTYPE html>' ${WEB_RESP}
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then
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echo "Error retrieving RFC $1"
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echo "Please create github issue at https://github.com/chubin/cheat.sh/issues"
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return 2
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else
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cat -s ${WEB_RESP}
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return 0
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fi
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)
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RFC_get "$1"
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