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Bitcoin price grabber
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| #!/usr/bin/env bash | |
| # | |
| # bitprice - bitcoin price grabber | |
| # | |
| # Version 1.2 | |
| # | |
| # By Kevin MacMartin (prurigro@gmail.com) | |
| # Released under the MIT license | |
| # | |
| script_name="${0//*\/}" | |
| outdir='/var/lib/bitprice' | |
| exchange_url='https://www.cavirtex.com' | |
| currency='C$' | |
| # colours | |
| [[ -t 1 ]] && { | |
| c_d=$'\e[1;30m' # DARK GREY | |
| c_r=$'\e[1;31m' # RED | |
| c_g=$'\e[1;32m' # GREEN | |
| c_y=$'\e[1;33m' # YELLOW | |
| c_b=$'\e[1;34m' # BLUE | |
| c_m=$'\e[1;35m' # VIOLET | |
| c_t=$'\e[1;36m' # TEAL | |
| c_w=$'\e[1;37m' # WHITE | |
| c_c=$'\e[0m' # DISABLES COLOUR | |
| } | |
| # output an error and exit with a failure code | |
| function error() { | |
| printf "%s\n" "${c_r}ERROR: $c_w$1$c_c" >&2 | |
| exit 1 | |
| } | |
| # display usage information and available commands | |
| function help(){ | |
| printf '\n%s\n' "${c_b}USAGE$c_c" | |
| printf ' %s\n\n' "$c_y$script_name$c_c $c_d[${c_r}OPTION$c_d]$c_c" | |
| printf '%s\n' "${c_b}OPTIONS$c_c" | |
| printf ' %-34s %s\n' "${c_w}h$c_d|${c_w}high$c_c" "${c_w}display the last recorded high price$c_c" | |
| printf ' %-34s %s\n' "${c_w}l$c_d|${c_w}low$c_c" "${c_w}display the last recorded low price$c_c" | |
| printf ' %-32s %s\n' "${c_w}a$c_d|${c_w}average$c_c" "${c_w}display the last recorded average price$c_c" | |
| printf ' %-34s %s\n' "${c_w}u$c_d|${c_w}update$c_c" "${c_w}update the recorded prices$c_c" | |
| printf ' %-34s %s\n\n' "${c_w}h$c_d|${c_w}help$c_c" "${c_w}display this help text$c_c" | |
| exit | |
| } | |
| # fetch the given price | |
| function fetch_price() { | |
| local match='' domatch=0 | |
| while read -r; do | |
| (( domatch == 1 )) && { | |
| [[ "$REPLY" =~ [^\<]*\<[^\>]*\>[^\&]* && "${BASH_REMATCH[0]}" =~ [0-9][^\>]*$ ]] && { | |
| match="${BASH_REMATCH[0]/\.*}" | |
| break | |
| } | |
| domatch=0 | |
| } | |
| [[ "$REPLY" =~ $1 ]] && domatch=1 | |
| done < <(wget -q -O - "$exchange_url") | |
| [[ -z "$match" ]] \ | |
| && error "unable to fetch the $1 price from: $exchange_url" | |
| printf '%s\n' "$match" | |
| } | |
| # update the price | |
| function update_prices() { | |
| [[ $(<"$outdir/.auto-update") = 1 ]] \ | |
| || exit 0 | |
| # Fetch High and Low prices | |
| high="$(fetch_price High)" | |
| low="$(fetch_price Low)" | |
| [[ -z "$high" || -z "$low" ]] \ | |
| && exit 1 | |
| # Calculate the Average price and tweak formatting | |
| average=$(( (( high + low )) / 2 )) | |
| [[ -z "$average" ]] \ | |
| && error "unable to process data from: $exchange_url" | |
| # Write updated prices | |
| printf '%s\n' "$high.00" > "$outdir/high" | |
| printf '%s\n' "$low.00" > "$outdir/low" | |
| printf '%s\n' "$average.00" > "$outdir/average" | |
| printf '%s\n' "$(date '+%Y-%m-%d %R')" > "$outdir/.last_update" | |
| } | |
| # returns the high, low and average price respectively | |
| function get_high() { printf '%s\n' "$(<"$outdir/high")"; } | |
| function get_low() { printf '%s\n' "$(<"$outdir/low")"; } | |
| function get_average() { printf '%s\n' "$(<"$outdir/average")"; } | |
| if [[ ! -d "$outdir" ]]; then | |
| install -d "$outdir" | |
| update_prices | |
| elif [[ ! -f "$outdir/high" || ! -f "$outdir/low" || ! -f "$outdir/average" ]]; then | |
| [[ ! "$1" = 'update' && ! "$1" = 'u' ]] \ | |
| && update_prices | |
| fi | |
| if [[ -z "$1" ]]; then | |
| printf '%s\n' "฿1 = $currency$(get_high) (high)" | |
| printf '%s\n' "฿1 = $currency$(get_low) (low)" | |
| printf '%s\n' "฿1 = $currency$(get_average) (average)" | |
| printf '\n%s\n' "updated: $(<"$outdir/.last_update")" | |
| else | |
| case "$1" in | |
| high|h) | |
| printf '%s\n' "$(get_high)" | |
| ;; | |
| low|l) | |
| printf '%s\n' "$(get_low)" | |
| ;; | |
| average|a) | |
| printf '%s\n' "$(get_average)" | |
| ;; | |
| update|u) | |
| update_prices | |
| ;; | |
| help|h|--help|-h) | |
| help | |
| ;; | |
| *) | |
| error "$1 is not a valid command" | |
| ;; | |
| esac | |
| fi |
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