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Add generalized product-pricelimiter.sh
Replaces xxl-product-pricelimiter.sh
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,113 @@ | ||
| #!/bin/bash | ||
| read -r -d '' USAGE << EOM | ||
| # ------------------------------------------------------------------------------ | ||
| # Compare product price on a web page with a given maximum price. | ||
| # | ||
| # Usage: product-pricelimiter.sh ProductURL Element MaxPrice | ||
| # | ||
| # ProductURL web page URL to fetch the current price from | ||
| # Element the HTML element containing the price (#id or .class) | ||
| # MaxPrice float number | ||
| # | ||
| # Exit codes: | ||
| # | ||
| # 0 OK Price is found and lower than or equal with the MaxPrice. | ||
| # 1 ERROR An error has occured; unable to tell the result. | ||
| # 2 WAIT Price is found but higher than the MaxPrice. | ||
| # | ||
| # Author : Esa Jokinen (oh2fih) | ||
| # Home : https://github.com/oh2fih/Misc-Scripts | ||
| # ------------------------------------------------------------------------------ | ||
| EOM | ||
|
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| # Fake user-agent for curl | ||
|
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| UA="Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 " | ||
| UA+="(KHTML, like Gecko) Chrome/127.0.0.0 Safari/537.36" | ||
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| # Test the inputs... | ||
|
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| if [ "$#" -ne 3 ]; then | ||
| echo -e "\033[0;33m${USAGE}\033[0m" >&2 | ||
| exit 1 | ||
| fi | ||
|
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| if [[ "$3" =~ ^[+-]?[0-9]+[\.,]?[0-9]*$ ]] 2>/dev/null; then | ||
| producturl="$1" | ||
| selector="$2" | ||
| maxprice=$(printf "%s" "$3" | sed 's/,/./g') | ||
| else | ||
| echo -e "\033[0;31mMax price should be a (float) number!\033[0m" >&2 | ||
| exit 1 | ||
| fi | ||
|
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| # Validate the URL | ||
|
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| regex='(https?)://[-A-Za-z0-9\+&@#/%?=~_|!:,.;]*[-A-Za-z0-9\+&@#/%=~_|]' | ||
| if ! [[ $producturl =~ $regex ]]; then | ||
| echo -e "\033[0;31mThe first argument was not a valid URL!\033[0m" >&2 | ||
| exit 1 | ||
| fi | ||
|
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| # Check for requirements. Print all unmet requirements at once. | ||
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| required_command() { | ||
| if ! command -v "$1" &> /dev/null; then | ||
| if [ -z ${2+x} ]; then | ||
| echo -e "\033[0;31mThis script requires ${1}!\033[0m" >&2 | ||
| else | ||
| echo -e "\033[0;31mThis script requires ${1} ${2}!\033[0m" >&2 | ||
| fi | ||
| ((UNMET=UNMET+1)) | ||
| fi | ||
| } | ||
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| UNMET=0 | ||
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| required_command "hxselect" "; Please install html-xml-utils" | ||
| required_command "hxnormalize" "; Please install html-xml-utils" | ||
| required_command "grep" "for parsing the page content" | ||
| required_command "sed" "for converting delimiters" | ||
| required_command "curl" "for fetching the web page" | ||
| required_command "sort" "for comparing float numbers" | ||
| required_command "head" "for comparing float numbers" | ||
|
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| if [ "$UNMET" -gt 0 ]; then | ||
| exit 1 | ||
| fi | ||
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| # Normalize the web page and get the monitored element | ||
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| element_contents=$( | ||
| curl -A "$UA" -s "$producturl" \ | ||
| | hxnormalize -x \ | ||
| | hxselect -c "$selector" | ||
| ) | ||
| if [ "$element_contents" == "" ]; then | ||
| echo -e "\033[0;31mFailed to fetch \"$selector\" in ${producturl}\033[0m" >&2 | ||
| exit 1 | ||
| fi | ||
|
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| # Extract price (first match) from the element and compare it with the limit | ||
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| price=$( | ||
| echo "$element_contents" \ | ||
| | grep -m 1 -Eo '[0-9]+([,\.][0-9]{0,2})?' \ | ||
| | sed 's/,/./g' | head -n 1 | ||
| ) | ||
| if [ "$price" == "" ]; then | ||
| echo -e "\033[0;31mPrice not found from \"${selector}\"!\033[0m" >&2 | ||
| exit 1 | ||
| fi | ||
|
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| lower=$(printf "%s\n%s" "$price" "$maxprice" | sort -g | head -1) | ||
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| if [ "$lower" = "$price" ]; then | ||
| echo -ne "\033[0;32mGood to buy! " | ||
| echo -e "The price in \"$selector\" is now $price €\033[0m" | ||
| exit 0 | ||
| else | ||
| echo -ne "\033[0;33mPlease be patient! " | ||
| echo -e "The price in \"$selector\" is still $price €\033[0m" | ||
| exit 2 | ||
| fi |
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