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#!/bin/sh
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# Enable mathematics in POSIX shell
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calc() { awk "BEGIN { printf(\"%.2f\", $*) }"; }
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data() {
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[ -z "$1" ] && return 1
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url="$1"
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curl --location --request GET --silent "$url"
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}
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output() {
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[ -z "$1" ] && return 1
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# Get symbol and color
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difference="$1"
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possitive=$(calc "$difference >= 0" | cut -c 1)
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if [ "$possitive" -eq 1 ]; then
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symbol=""
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color="$COLOR2"
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else
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symbol=""
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color="$COLOR1"
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fi
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# Result
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echo "%{F$color}$symbol $difference%%{F$COLOR15}"
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}
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# Get dates
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date_last_week_start="$(date --date 'last week' +%s000)"
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date_last_week_end=$(calc "$date_last_week_start + (1000 * 60 * 60)") # +1h
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date_last_week_end=${date_last_week_end%.00} # cut off ".00" at the end
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# API URLs
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url="https://api.coincap.io/v2/assets/bitcoin"
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url_last_week="${url}/history?interval=h1&start=${date_last_week_start}&end=${date_last_week_end}"
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# Current price
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data="$(data "$url")"
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data_first_character="$(echo "$data" | cut -c 1)"
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if [ "$data_first_character" != "{" ]; then echo "rate limit"; exit; fi
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price="$(echo "$data" | jq --compact-output --raw-output '.data.priceUsd')"
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price=$(calc "$price")
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# Get yesterdays difference
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difference_yesterday="$(echo "$data" | jq --compact-output --raw-output '.data.changePercent24Hr')"
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difference_yesterday="$(calc "$difference_yesterday")"
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# Get last weeks difference
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data_last_week="$(data "$url_last_week")"
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data_last_week_first_character="$(echo "$data_last_week" | cut -c 1)"
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if [ "$data_last_week_first_character" != "{" ]; then echo "rate limit"; exit; fi
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price_last_week="$(echo "$data_last_week" | jq --compact-output --raw-output '.data[0].priceUsd')"
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difference_last_week=$(calc "$price / $price_last_week * 100 - 100")
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# Create output formatting
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difference_yesterday_output="d $(output "$difference_yesterday")"
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difference_last_week_output="w $(output "$difference_last_week")"
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echo "\$$price $difference_yesterday_output $difference_last_week_output"
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