287 lines
8.7 KiB
Bash
Executable File
287 lines
8.7 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Author: Alexander Epstein https://github.com/alexanderepstein
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unset base
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unset exchangeTo
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currentVersion="1.22.1"
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unset configuredClient
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currencyCodes=(AUD BGN BRL CAD CHF CNY CZK DKK
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EUR GBP HKD HRK HUF IDR ILS INR
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JPY KRW MXN MYR NOK NZD PHP PLN
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RON RUB SEK SGD THB TRY USD ZAR)
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## This function determines which http get tool the system has installed and returns an error if there isnt one
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getConfiguredClient()
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{
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if command -v curl &>/dev/null; then
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configuredClient="curl"
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elif command -v wget &>/dev/null; then
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configuredClient="wget"
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elif command -v http &>/dev/null; then
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configuredClient="httpie"
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elif command -v fetch &>/dev/null; then
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configuredClient="fetch"
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else
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echo "Error: This tool reqires either curl, wget, httpie or fetch to be installed." >&2
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return 1
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fi
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}
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## Allows to call the users configured client without if statements everywhere
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httpGet()
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{
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case "$configuredClient" in
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curl) curl -A curl -s "$@" ;;
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wget) wget -qO- "$@" ;;
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httpie) http -b GET "$@" ;;
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fetch) fetch -q "$@" ;;
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esac
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}
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checkValidCurrency()
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{
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if [[ "${currencyCodes[*]}" == *"$(echo "${@}" | tr -d '[:space:]')"* ]]; then
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echo "0"
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else
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echo "1"
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fi
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}
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## Grabs the base currency from the user and validates it with all the possible currency
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## types available on the API and guides user through input (doesnt take in arguments)
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getBase()
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{
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echo -n "What is the base currency: "
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read -r base
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base=$(echo $base | tr /a-z/ /A-Z/)
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if [[ $(checkValidCurrency $base) == "1" ]]; then
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unset base
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echo "Invalid base currency"
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getBase
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fi
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}
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## Checks base currency from the user and validates it with all the possible currency
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## types available on the API (requires argument)
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checkBase()
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{
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base=$1
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base=$(echo $base | tr /a-z/ /A-Z/)
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if [[ $(checkValidCurrency $base) == "1" ]]; then
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unset base
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echo "Invalid base currency"
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exit 1
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fi
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}
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## Grabs the exchange to currency from the user and validates it with all the possible currency
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## types available on the API and guides user through input (doesnt take in arguments)
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getExchangeTo()
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{
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echo -n "What currency to exchange to: "
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read -r exchangeTo
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exchangeTo=$(echo $exchangeTo | tr /a-z/ /A-Z/)
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if [[ $(checkValidCurrency $exchangeTo) == "1" ]]; then
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echo "Invalid exchange currency"
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unset exchangeTo
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getExchangeTo
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fi
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}
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## Grabs the exchange to currency from the user and validates it with all the possible currency
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## types available on the API (requires arguments)
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checkExchangeTo()
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{
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exchangeTo=$1
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exchangeTo=$(echo $exchangeTo | tr /a-z/ /A-Z/)
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if [[ $(checkValidCurrency $exchangeTo) == "1" ]]; then
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echo "Invalid exchange currency"
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unset exchangeTo
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exit 1
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fi
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}
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## Get the amount that will be exchanged and validate that the user has entered a number (decimals are allowed)
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## doesnt take in argument, it guides user through input
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getAmount()
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{
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echo -n "What is the amount being exchanged: "
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read -r amount
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if [[ ! "$amount" =~ ^[0-9]+(\.[0-9]+)?$ ]]
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then
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echo "The amount has to be a number"
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unset amount
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getAmount
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fi
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}
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## Get the amount that will be exchanged
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## validate that the user has entered a number (decimals are allowed and requires argument)
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checkAmount()
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{
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amount=$1
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if [[ ! "$amount" =~ ^[0-9]+(\.[0-9]+)?$ ]]
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then
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echo "The amount has to be a number"
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unset amount
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exit 1
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fi
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}
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checkInternet()
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{
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httpGet github.com > /dev/null 2>&1 || { echo "Error: no active internet connection" >&2; return 1; } # query github with a get request
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}
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## Grabs the exchange rate and does the math for converting the currency
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convertCurrency()
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{
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exchangeRate=$(httpGet "https://api.exchangeratesapi.io/latest?base=$base" | grep -Eo "$exchangeTo\":[1-9.]*" | grep -Eo "[0-9.]*") > /dev/null
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if ! command -v bc &>/dev/null; then
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oldRate=$exchangeRate
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exchangeRate=$(echo $exchangeRate | grep -Eo "^[0-9]*" )
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amount=$(echo $amount | grep -Eo "^[0-9]*" )
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exchangeAmount=$(( $exchangeRate * $amount ))
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exchangeRate=$oldRate
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else
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exchangeAmount=$( echo "$exchangeRate * $amount" | bc )
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fi
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cat <<EOF
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=========================
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| $base to $exchangeTo
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| Rate: $exchangeRate
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| $base: $amount
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| $exchangeTo: $exchangeAmount
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=========================
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EOF
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}
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update()
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{
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# Author: Alexander Epstein https://github.com/alexanderepstein
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# Update utility version 2.2.0
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# To test the tool enter in the defualt values that are in the examples for each variable
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repositoryName="Bash-Snippets" #Name of repostiory to be updated ex. Sandman-Lite
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githubUserName="alexanderepstein" #username that hosts the repostiory ex. alexanderepstein
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nameOfInstallFile="install.sh" # change this if the installer file has a different name be sure to include file extension if there is one
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latestVersion=$(httpGet https://api.github.com/repos/$githubUserName/$repositoryName/tags | grep -Eo '"name":.*?[^\\]",'| head -1 | grep -Eo "[0-9.]+" ) #always grabs the tag without the v option
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if [[ $currentVersion == "" || $repositoryName == "" || $githubUserName == "" || $nameOfInstallFile == "" ]]; then
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echo "Error: update utility has not been configured correctly." >&2
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exit 1
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elif [[ $latestVersion == "" ]]; then
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echo "Error: no active internet connection" >&2
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exit 1
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else
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if [[ "$latestVersion" != "$currentVersion" ]]; then
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echo "Version $latestVersion available"
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echo -n "Do you wish to update $repositoryName [Y/n]: "
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read -r answer
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if [[ "$answer" == [Yy] ]]; then
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cd ~ || { echo 'Update Failed'; exit 1; }
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if [[ -d ~/$repositoryName ]]; then rm -r -f $repositoryName || { echo "Permissions Error: try running the update as sudo"; exit 1; } ; fi
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echo -n "Downloading latest version of: $repositoryName."
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git clone -q "https://github.com/$githubUserName/$repositoryName" && touch .BSnippetsHiddenFile || { echo "Failure!"; exit 1; } &
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while [ ! -f .BSnippetsHiddenFile ]; do { echo -n "."; sleep 2; };done
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rm -f .BSnippetsHiddenFile
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echo "Success!"
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cd $repositoryName || { echo 'Update Failed'; exit 1; }
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git checkout "v$latestVersion" 2> /dev/null || git checkout "$latestVersion" 2> /dev/null || echo "Couldn't git checkout to stable release, updating to latest commit."
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chmod a+x install.sh #this might be necessary in your case but wasnt in mine.
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./$nameOfInstallFile "update" || exit 1
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cd ..
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rm -r -f $repositoryName || { echo "Permissions Error: update succesfull but cannot delete temp files located at ~/$repositoryName delete this directory with sudo"; exit 1; }
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else
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exit 1
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fi
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else
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echo "$repositoryName is already the latest version"
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fi
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fi
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}
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usage()
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{
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cat <<EOF
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Currency
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Description: A realtime currency converter.
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With no flags it will guide you through the currency exchange
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Usage: currency or currency [flag] or currency [base] [exchangeTo] [amount]
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-u Update Bash-Snippet Tools
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-h Show the help
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-v Get the tool version
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Supported Currencies:
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_______________________
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| AUD | BGN | BRL | CAD |
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| CHF | CNY | CZK | DKK |
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| EUR | GBP | HKD | HRK |
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| HUF | IDR | ILS | INR |
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| JPY | KRW | MXN | MYR |
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| NOK | NZD | PHP | PLN |
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| RON | RUB | SEK | SGD |
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| THB | TRY | USD | ZAR |
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_______________________
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Examples:
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currency EUR USD 12.35
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currency
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EOF
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}
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getConfiguredClient || exit 1
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while getopts "uvh" opt; do
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case "$opt" in
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\?) echo "Invalid option: -$OPTARG" >&2
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exit 1
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;;
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h) usage
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exit 0
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;;
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v) echo "Version $currentVersion"
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exit 0
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;;
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u) checkInternet || exit 1 # check if we have a valid internet connection if this isnt true the rest of the script will not work so stop here
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update
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exit 0
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;;
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:) echo "Option -$OPTARG requires an argument." >&2
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exit 1
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;;
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esac
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done
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if [[ $# == 0 ]]; then
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checkInternet || exit 1 # check if we have a valid internet connection if this isnt true the rest of the script will not work so stop here
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getBase # get base currency
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getExchangeTo # get exchange to currency
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getAmount # get the amount to be converted
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convertCurrency # grab the exhange rate and perform the conversion
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exit 0
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elif [[ $# == "1" ]]; then
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if [[ $1 == "update" ]]; then
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update
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elif [[ $1 == "help" ]]; then
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usage
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else
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echo "Not a valid argument"
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usage
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exit 1
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fi
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elif [[ $# == "2" ]]; then
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echo "Not a valid argument"
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usage
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exit 1
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elif [[ $# == "3" ]]; then
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checkInternet || exit 1 # check if we have a valid internet connection if this isnt true the rest of the script will not work so stop here
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checkBase $1
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checkExchangeTo $2
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checkAmount $3
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convertCurrency
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exit 0
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else
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echo "Error: too many arguments."
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fi
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