2022-06-01 10:00:25 +02:00
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# shellcheck shell=bash
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2019-05-28 17:44:30 +02:00
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__usage() {
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if (($1 < $2)); then
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printf 'Usage: %s %s\n' "${FUNCNAME[1]}" "$3"
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2023-11-15 18:27:45 +01:00
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return 1
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2019-05-28 17:44:30 +02:00
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fi
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2023-11-15 18:27:45 +01:00
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return 0
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2019-05-28 17:44:30 +02:00
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}
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__isnumber() {
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[[ $1 == ?([+-])+([0-9])?([.,]+([0-9])) ]]
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}
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count() { # Counts the number of characters in a string
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2023-11-15 18:27:45 +01:00
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__usage $# 1 '<string>' || return 1
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2019-05-28 17:44:30 +02:00
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printf '%d\n' "${#1}"
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}
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2020-07-15 17:51:59 +02:00
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trim() { # Trims leading and trailing whitespace
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2023-11-15 18:27:45 +01:00
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__usage $# 1 '<string>' || return 1
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2019-05-28 17:44:30 +02:00
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: "${1#"${1%%[![:space:]]*}"}"
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: "${_%"${_##*[![:space:]]}"}"
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printf '%s\n' "$_"
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}
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rot13() { # Encodes/Decodes string in rot13
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2023-11-15 18:27:45 +01:00
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__usage $# 1 '<string>' || return 1
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2019-05-28 17:44:30 +02:00
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tr 'A-Za-z' 'N-ZA-Mn-za-m' <<< "$1"
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}
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tempconv() { # Converts Fahrenheit to Celsius and vice versa
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2023-11-15 18:27:45 +01:00
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__usage $# 2 '<c | f> <degree>' || return 1
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2019-05-28 17:44:30 +02:00
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if ! __isnumber "$2"; then
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printf 'The second argument must be a number.\n' >&2
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return 1
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fi
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case "$1" in
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2023-11-15 18:27:45 +01:00
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[Ff]) printf '%d\u02DAC\n' "$((5 * ($2 - 32) / 9))"; return ;;
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2021-09-16 09:26:36 +02:00
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[Cc]) printf '%d\u02DAF\n' "$(($2 * 9 / 5 + 32))"; return ;;
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2023-11-15 18:27:45 +01:00
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*) __usage 0 1 '<c | f> <degree>' || return 1
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2019-05-28 17:44:30 +02:00
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esac
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}
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rgb2hex() { # Converts rgb colour to hex
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2023-11-15 18:27:45 +01:00
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__usage $# 3 '<red> <green> <blue>' || return 1
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2019-05-28 17:44:30 +02:00
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printf '#%02x%02x%02x\n' "$1" "$2" "$3"
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}
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hex2rgb() { # Converts hex colour to rgb
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2023-11-15 18:27:45 +01:00
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__usage $# 1 '<hex>' || return 1
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declare -i r g b
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((r=16#${1:0:2},g=16#${1:2:2},b=16#${1:4:2}))
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printf '%s %s %s\n' $r $g $b
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2019-05-28 17:44:30 +02:00
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}
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shuffle() { # Shuffles letters in string
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2023-11-15 18:27:45 +01:00
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__usage $# 1 '<string>' || return 1
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2019-05-28 17:44:30 +02:00
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perl -MList::Util=shuffle -F'' \
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-lane 'print shuffle @F' <<< "$1"
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}
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2020-07-15 17:51:59 +02:00
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weather() { # Shows weather info from wttr.in
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2023-11-15 18:27:45 +01:00
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__usage $# 1 '<place> [country]' || return 1
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curl -fsS4 "v2d.wttr.in/${1}+${2:-Greece}" | head -n -2
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2019-05-28 17:44:30 +02:00
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}
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sri() { # Prints the SRI hash of a resource
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2023-11-15 18:27:45 +01:00
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__usage $# 1 '<URL> [bits]' || return 1
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2019-09-25 20:07:56 +02:00
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printf 'sha%d-%s\n' "${2:-384}" \
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"$(curl -Ss "$1" | shasum -ba "${2:-384}" - | xxd -r -p | base64)"
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2019-05-28 17:44:30 +02:00
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}
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myip() { # What's my ip
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2023-01-27 12:33:26 +01:00
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dig +short +tls A myip.opendns.com @resolver1.opendns.com
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2019-05-28 17:44:30 +02:00
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}
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urlencode() { # Encodes string for url
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2023-11-15 18:27:45 +01:00
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__usage $# 1 '<string>' || return 1
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2020-07-15 17:51:59 +02:00
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declare LANG=C len=${#1} char i
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2019-05-28 17:44:30 +02:00
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for ((i = 0; i < len; ++i)); do
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char="${1:i:1}"
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case $char in
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[a-zA-Z0-9.~_-]) printf '%s' "$char" ;;
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*) printf '%%%02X' "'$char" ;;
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esac
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done
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}
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urldecode() { # Decodes urlencoded string
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2023-11-15 18:27:45 +01:00
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__usage $# 1 '<string>' || return 1
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2019-05-28 17:44:30 +02:00
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printf '%b\n' "${*//%/\\x}"
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}
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utf8decode() { # Decodes =?UTF-8?B?...?= string
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2023-11-15 18:27:45 +01:00
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__usage $# 1 '<string>' || return 1
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2019-09-25 20:07:56 +02:00
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[[ $* =~ ^=\?[Uu][Tt][Ff]-8\?[Bb]\?([^?]+)\?=$ ]]
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2019-05-28 17:44:30 +02:00
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printf '%s\n' "$(base64 -d <<< "${BASH_REMATCH[1]}")"
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}
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2020-07-15 17:51:59 +02:00
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iso2usb() { # Writes an iso to a usb device
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2023-11-15 18:27:45 +01:00
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__usage $# 2 '<iso> <usb> [bs]' || return 1
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2020-07-15 17:51:59 +02:00
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sudo dd if="$1" of="$2" status=progress bs="${3:-4M}" oflag=sync
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}
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2019-11-24 15:50:07 +01:00
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# vim:fdm=syntax:fdl=0:
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