Files
shell-scripting-templates/utilities/dates.bash
Nathaniel Landau 24dfe4b97f cleanup regex
2021-08-19 17:12:47 -04:00

396 lines
18 KiB
Bash

_monthToNumber_() {
# DESC: Convert a month name to a number
# ARGS: None
# OUTS: Prints the number of the month to stdout
# USAGE: _monthToNumber_ "January"
local mon="$(echo "$1" | tr '[:upper:]' '[:lower:]')"
case "$mon" in
january | jan | ja) echo 1 ;;
february | feb | fe) echo 2 ;;
march | mar | ma) echo 3 ;;
april | apr | ap) echo 4 ;;
may) echo 5 ;;
june | jun | ju) echo 6 ;;
july | jul) echo 7 ;;
august | aug | au) echo 8 ;;
september | sep | se) echo 9 ;;
october | oct) echo 10 ;;
november | nov | no) echo 11 ;;
december | dec | de) echo 12 ;;
*)
warning "month_monthToNumber_: Bad monthname: $1"
return 1
;;
esac
}
_numberToMonth_() {
# DESC: Convert a month number to its name
# ARGS: None
# OUTS: Prints the name of the month to stdout
# USAGE: _numberToMonth_ 1
local mon="$1"
case "$mon" in
1 | 01) echo January ;;
2 | 02) echo February ;;
3 | 03) echo March ;;
4 | 04) echo April ;;
5 | 05) echo May ;;
6 | 06) echo June ;;
7 | 07) echo July ;;
8 | 08) echo August ;;
9 | 09) echo September ;;
10) echo October ;;
11) echo November ;;
12) echo December ;;
*)
warning "_numberToMonth_: Bad month number: $1"
return 1
;;
esac
}
_parseDate_() {
# DESC: Takes a string as input and attempts to find a date within it
# to parse into component parts (day, month, year)
# ARGS: $1 (required) - A string
# OUTS: Returns error if no date found
# $_parseDate_found - The date found in the string
# $_parseDate_year - The year
# $_parseDate_month - The number month
# $_parseDate_monthName - The name of the month
# $_parseDate_day - The day
# $_parseDate_hour - The hour (if avail)
# $_parseDate_minute - The minute (if avail)
# USAGE: if _parseDate_ "[STRING]"; then ...
# NOTE: This function only recognizes dates from the year 2000 to 2029
# NOTE: Will recognize dates in the following formats separated by '-_ ./'
# * YYYY-MM-DD * Month DD, YYYY * DD Month, YYYY
# * Month, YYYY * Month, DD YY * MM-DD-YYYY
# * MMDDYYYY * YYYYMMDD * DDMMYYYY
# * YYYYMMDDHHMM * YYYYMMDDHH * DD-MM-YYYY
# * DD MM YY * MM DD YY
# TODO: Impelemt the following date formats
# * MMDDYY * YYMMDD * mon-DD-YY
# TODO: Simplify and reduce the number of regex checks
[[ $# -eq 0 ]] && {
error 'Missing required argument to _parseDate_()!'
return 1
}
local date="${1:-$(date +%F)}"
_parseDate_found="" _parseDate_year="" _parseDate_month="" _parseDate_monthName=""
_parseDate_day="" _parseDate_hour="" _parseDate_minute=""
shopt -s nocasematch #Use case-insensitive regex
debug "_parseDate_() input ${tan}$date${purple}"
# YYYY MM DD or YYYY-MM-DD
pat="(.*[^0-9]|^)((20[0-2][0-9])[-\.\/_ ]+([0-9]{1,2})[-\.\/_ ]+([0-9]{1,2}))([^0-9].*|$)"
if [[ ${date} =~ $pat ]]; then
_parseDate_found="${BASH_REMATCH[2]}"
_parseDate_year=$((10#${BASH_REMATCH[3]}))
_parseDate_month=$((10#${BASH_REMATCH[4]}))
_parseDate_monthName="$(_numberToMonth_ "${_parseDate_month}")"
_parseDate_day=$((10#${BASH_REMATCH[5]}))
debug "regex match: ${tan}YYYY-MM-DD${purple}"
# Month DD, YYYY
elif [[ ${date} =~ ((january|jan|ja|february|feb|fe|march|mar|ma|april|apr|ap|may|june|jun|july|jul|ju|august|aug|september|sep|october|oct|november|nov|december|dec)[-\./_ ]+([0-9]{1,2})(nd|rd|th|st)?,?[-\./_ ]+(20[0-2][0-9]))([^0-9].*|$) ]]; then
_parseDate_found="${BASH_REMATCH[1]:-}"
_parseDate_month=$(_monthToNumber_ ${BASH_REMATCH[2]:-})
_parseDate_monthName="$(_numberToMonth_ "${_parseDate_month:-}")"
_parseDate_day=$((10#${BASH_REMATCH[3]:-}))
_parseDate_year=$((10#${BASH_REMATCH[5]:-}))
debug "regex match: ${tan}Month DD, YYYY${purple}"
# Month DD, YY
elif [[ ${date} =~ ((january|jan|ja|february|feb|fe|march|mar|ma|april|apr|ap|may|june|jun|july|jul|ju|august|aug|september|sep|october|oct|november|nov|december|dec)[-\./_ ]+([0-9]{1,2})(nd|rd|th|st)?,?[-\./_ ]+([0-9]{2}))([^0-9].*|$) ]]; then
_parseDate_found="${BASH_REMATCH[1]}"
_parseDate_month=$(_monthToNumber_ ${BASH_REMATCH[2]})
_parseDate_monthName="$(_numberToMonth_ "${_parseDate_month}")"
_parseDate_day=$((10#${BASH_REMATCH[3]}))
_parseDate_year="20$((10#${BASH_REMATCH[5]}))"
debug "regex match: ${tan}Month DD, YY${purple}"
# DD Month YYYY
elif [[ ${date} =~ (.*[^0-9]|^)(([0-9]{2})[-\./_ ]+(january|jan|ja|february|feb|fe|march|mar|ma|april|apr|ap|may|june|jun|july|jul|ju|august|aug|september|sep|october|oct|november|nov|december|dec),?[-\./_ ]+(20[0-2][0-9]))([^0-9].*|$) ]]; then
_parseDate_found="${BASH_REMATCH[2]}"
_parseDate_day=$((10#"${BASH_REMATCH[3]}"))
_parseDate_month="$(_monthToNumber_ "${BASH_REMATCH[4]}")"
_parseDate_monthName="$(_numberToMonth_ "${_parseDate_month}")"
_parseDate_year=$((10#"${BASH_REMATCH[5]}"))
debug "regex match: ${tan}DD Month, YYYY${purple}"
# MM-DD-YYYY or DD-MM-YYYY
elif [[ ${date} =~ (.*[^0-9]|^)(([0-9]{1,2})[-\.\/_ ]+([0-9]{1,2})[-\.\/_ ]+(20[0-2][0-9]))([^0-9].*|$) ]]; then
if [[ $((10#${BASH_REMATCH[3]})) -lt 13 &&
$((10#${BASH_REMATCH[4]})) -gt 12 &&
$((10#${BASH_REMATCH[4]})) -lt 32 ]] \
; then
_parseDate_found="${BASH_REMATCH[2]}"
_parseDate_year=$((10#${BASH_REMATCH[5]}))
_parseDate_month=$((10#${BASH_REMATCH[3]}))
_parseDate_monthName="$(_numberToMonth_ "${_parseDate_month}")"
_parseDate_day=$((10#${BASH_REMATCH[4]}))
debug "regex match: ${tan}MM-DD-YYYY${purple}"
elif [[ $((10#${BASH_REMATCH[3]})) -gt 12 &&
$((10#${BASH_REMATCH[3]})) -lt 32 &&
$((10#${BASH_REMATCH[4]})) -lt 13 ]] \
; then
_parseDate_found="${BASH_REMATCH[2]}"
_parseDate_year=$((10#${BASH_REMATCH[5]}))
_parseDate_month=$((10#${BASH_REMATCH[4]}))
_parseDate_monthName="$(_numberToMonth_ "${_parseDate_month}")"
_parseDate_day=$((10#${BASH_REMATCH[3]}))
debug "regex match: ${tan}DD-MM-YYYY${purple}"
elif [[ $((10#${BASH_REMATCH[3]})) -lt 32 &&
$((10#${BASH_REMATCH[4]})) -lt 13 ]] \
; then
_parseDate_found="${BASH_REMATCH[2]}"
_parseDate_year=$((10#${BASH_REMATCH[5]}))
_parseDate_month=$((10#${BASH_REMATCH[3]}))
_parseDate_monthName="$(_numberToMonth_ "${_parseDate_month}")"
_parseDate_day=$((10#${BASH_REMATCH[4]}))
debug "regex match: ${tan}MM-DD-YYYY${purple}"
else
shopt -u nocasematch
return 1
fi
elif [[ ${date} =~ (.*[^0-9]|^)(([0-9]{1,2})[-\.\/_ ]+([0-9]{1,2})[-\.\/_ ]+([0-9]{2}))([^0-9].*|$) ]]; then
if [[ $((10#${BASH_REMATCH[3]})) -lt 13 &&
$((10#${BASH_REMATCH[4]})) -gt 12 &&
$((10#${BASH_REMATCH[4]})) -lt 32 ]] \
; then
_parseDate_found="${BASH_REMATCH[2]}"
_parseDate_year="20$((10#${BASH_REMATCH[5]}))"
_parseDate_month=$((10#${BASH_REMATCH[3]}))
_parseDate_monthName="$(_numberToMonth_ "${_parseDate_month}")"
_parseDate_day=$((10#${BASH_REMATCH[4]}))
debug "regex match: ${tan}MM-DD-YYYY${purple}"
elif [[ $((10#${BASH_REMATCH[3]})) -gt 12 &&
$((10#${BASH_REMATCH[3]})) -lt 32 &&
$((10#${BASH_REMATCH[4]})) -lt 13 ]] \
; then
_parseDate_found="${BASH_REMATCH[2]}"
_parseDate_year="20$((10#${BASH_REMATCH[5]}))"
_parseDate_month=$((10#${BASH_REMATCH[4]}))
_parseDate_monthName="$(_numberToMonth_ "${_parseDate_month}")"
_parseDate_day=$((10#${BASH_REMATCH[3]}))
debug "regex match: ${tan}DD-MM-YYYY${purple}"
elif [[ $((10#${BASH_REMATCH[3]})) -lt 32 &&
$((10#${BASH_REMATCH[4]})) -lt 13 ]] \
; then
_parseDate_found="${BASH_REMATCH[2]}"
_parseDate_year="20$((10#${BASH_REMATCH[5]}))"
_parseDate_month=$((10#${BASH_REMATCH[3]}))
_parseDate_monthName="$(_numberToMonth_ "${_parseDate_month}")"
_parseDate_day=$((10#${BASH_REMATCH[4]}))
debug "regex match: ${tan}MM-DD-YYYY${purple}"
else
shopt -u nocasematch
return 1
fi
# Month, YYYY
elif [[ ${date} =~ ((january|jan|ja|february|feb|fe|march|mar|ma|april|apr|ap|may|june|jun|july|jul|ju|august|aug|september|sep|october|oct|november|nov|december|dec),?[-\./_ ]+(20[0-2][0-9]))([^0-9].*|$) ]]; then
_parseDate_found="${BASH_REMATCH[1]}"
_parseDate_day="1"
_parseDate_month="$(_monthToNumber_ "${BASH_REMATCH[2]}")"
_parseDate_monthName="$(_numberToMonth_ $_parseDate_month)"
_parseDate_year="$((10#${BASH_REMATCH[3]}))"
debug "regex match: ${tan}Month, YYYY${purple}"
# YYYYMMDDHHMM
elif [[ ${date} =~ (.*[^0-9]|^)((20[0-2][0-9])([0-9]{2})([0-9]{2})([0-9]{2})([0-9]{2}))([^0-9].*|$) ]]; then
_parseDate_found="${BASH_REMATCH[2]}"
_parseDate_day="$((10#${BASH_REMATCH[5]}))"
_parseDate_month="$((10#${BASH_REMATCH[4]}))"
_parseDate_monthName="$(_numberToMonth_ "${_parseDate_month}")"
_parseDate_year="$((10#${BASH_REMATCH[3]}))"
_parseDate_hour="$((10#${BASH_REMATCH[6]}))"
_parseDate_minute="$((10#${BASH_REMATCH[7]}))"
debug "regex match: ${tan}YYYYMMDDHHMM${purple}"
# YYYYMMDDHH 1 2 3 4 5 6
elif [[ ${date} =~ (.*[^0-9]|^)((20[0-2][0-9])([0-9]{2})([0-9]{2})([0-9]{2}))([^0-9].*|$) ]]; then
_parseDate_found="${BASH_REMATCH[2]}"
_parseDate_day="$((10#${BASH_REMATCH[5]}))"
_parseDate_month="$((10#${BASH_REMATCH[4]}))"
_parseDate_monthName="$(_numberToMonth_ "${_parseDate_month}")"
_parseDate_year="$((10#${BASH_REMATCH[3]}))"
_parseDate_hour="${BASH_REMATCH[6]}"
_parseDate_minute="00"
debug "regex match: ${tan}YYYYMMDDHHMM${purple}"
# MMDDYYYY or YYYYMMDD or DDMMYYYY
# 1 2 3 4 5 6
elif [[ ${date} =~ (.*[^0-9]|^)(([0-9]{2})([0-9]{2})([0-9]{2})([0-9]{2}))([^0-9].*|$) ]]; then
# MMDDYYYY
if [[ $((10#${BASH_REMATCH[5]})) -eq 20 &&
$((10#${BASH_REMATCH[3]})) -lt 13 &&
$((10#${BASH_REMATCH[4]})) -lt 32 ]] \
; then
_parseDate_found="${BASH_REMATCH[2]}"
_parseDate_day="$((10#${BASH_REMATCH[4]}))"
_parseDate_month="$((10#${BASH_REMATCH[3]}))"
_parseDate_monthName="$(_numberToMonth_ "${_parseDate_month}")"
_parseDate_year="${BASH_REMATCH[5]}${BASH_REMATCH[6]}"
debug "regex match: ${tan}MMDDYYYY${purple}"
# DDMMYYYY
elif [[ $((10#${BASH_REMATCH[5]})) -eq 20 &&
$((10#${BASH_REMATCH[3]})) -gt 12 &&
$((10#${BASH_REMATCH[3]})) -lt 32 &&
$((10#${BASH_REMATCH[4]})) -lt 13 ]] \
; then
_parseDate_found="${BASH_REMATCH[2]}"
_parseDate_day="$((10#${BASH_REMATCH[3]}))"
_parseDate_month="$((10#${BASH_REMATCH[4]}))"
_parseDate_monthName="$(_numberToMonth_ "${_parseDate_month}")"
_parseDate_year="${BASH_REMATCH[5]}${BASH_REMATCH[6]}"
debug "regex match: ${tan}DDMMYYYY${purple}"
# YYYYMMDD
elif [[ $((10#${BASH_REMATCH[3]})) -eq 20 &&
$((10#${BASH_REMATCH[6]})) -gt 12 &&
$((10#${BASH_REMATCH[6]})) -lt 32 &&
$((10#${BASH_REMATCH[5]})) -lt 13 ]] \
; then
_parseDate_found="${BASH_REMATCH[2]}"
_parseDate_day="$((10#${BASH_REMATCH[6]}))"
_parseDate_month="$((10#${BASH_REMATCH[5]}))"
_parseDate_monthName="$(_numberToMonth_ "${_parseDate_month}")"
_parseDate_year="${BASH_REMATCH[3]}${BASH_REMATCH[4]}"
debug "regex match: ${tan}YYYYMMDD${purple}"
# YYYYDDMM
elif [[ $((10#${BASH_REMATCH[3]})) -eq 20 &&
$((10#${BASH_REMATCH[5]})) -gt 12 &&
$((10#${BASH_REMATCH[5]})) -lt 32 &&
$((10#${BASH_REMATCH[6]})) -lt 13 ]] \
; then
_parseDate_found="${BASH_REMATCH[2]}"
_parseDate_day="$((10#${BASH_REMATCH[5]}))"
_parseDate_month="$((10#${BASH_REMATCH[6]}))"
_parseDate_monthName="$(_numberToMonth_ "${_parseDate_month}")"
_parseDate_year="${BASH_REMATCH[3]}${BASH_REMATCH[4]}"
debug "regex match: ${tan}YYYYMMDD${purple}"
# Assume YYYMMDD
elif [[ $((10#${BASH_REMATCH[3]})) -eq 20 &&
$((10#${BASH_REMATCH[6]})) -lt 32 &&
$((10#${BASH_REMATCH[5]})) -lt 13 ]] \
; then
_parseDate_found="${BASH_REMATCH[2]}"
_parseDate_day="$((10#${BASH_REMATCH[6]}))"
_parseDate_month="$((10#${BASH_REMATCH[5]}))"
_parseDate_monthName="$(_numberToMonth_ "${_parseDate_month}")"
_parseDate_year="${BASH_REMATCH[3]}${BASH_REMATCH[4]}"
debug "regex match: ${tan}YYYYMMDD${purple}"
else
shopt -u nocasematch
return 1
fi
# # MMDD or DDYY
# elif [[ "$date" =~ .*(([0-9]{2})([0-9]{2})).* ]]; then
# debug "regex match: ${tan}MMDD or DDMM${purple}"
# _parseDate_found="${BASH_REMATCH[1]}"
# # Figure out if days are months or vice versa
# if [[ $(( 10#${BASH_REMATCH[2]} )) -gt 12 \
# && $(( 10#${BASH_REMATCH[2]} )) -lt 32 \
# && $(( 10#${BASH_REMATCH[3]} )) -lt 13 \
# ]]; then
# _parseDate_day="$(( 10#${BASH_REMATCH[2]} ))"
# _parseDate_month="$(( 10#${BASH_REMATCH[3]} ))"
# _parseDate_monthName="$(_numberToMonth_ "${_parseDate_month}")"
# _parseDate_year="$(date +%Y )"
# elif [[ $(( 10#${BASH_REMATCH[2]} )) -lt 13 \
# && $(( 10#${BASH_REMATCH[3]} )) -lt 32 \
# ]]; then
# _parseDate_day="$(( 10#${BASH_REMATCH[3]} ))"
# _parseDate_month="$(( 10#${BASH_REMATCH[2]} ))"
# _parseDate_monthName="$(_numberToMonth_ "${_parseDate_month}")"
# _parseDate_year="$(date +%Y )"
# else
# shopt -u nocasematch
# return 1
# fi
else
shopt -u nocasematch
return 1
fi
[[ -z ${_parseDate_year:-} ]] && {
shopt -u nocasematch
return 1
}
((_parseDate_month >= 1 && _parseDate_month <= 12)) || {
shopt -u nocasematch
return 1
}
((_parseDate_day >= 1 && _parseDate_day <= 31)) || {
shopt -u nocasematch
return 1
}
debug "${tan}\$_parseDate_found: ${_parseDate_found}${purple}"
debug "${tan}\$_parseDate_year: ${_parseDate_year}${purple}"
debug "${tan}\$_parseDate_month: ${_parseDate_month}${purple}"
debug "${tan}\$_parseDate_monthName: ${_parseDate_monthName}${purple}"
debug "${tan}\$_parseDate_day: ${_parseDate_day}${purple}"
[[ -z ${_parseDate_hour:-} ]] || debug "${tan}\$_parseDate_hour: ${_parseDate_hour}${purple}"
[[ -z ${_parseDate_minute:-} ]] || debug "${tan}\$_parseDate_minute: ${_parseDate_minute}${purple}"
shopt -u nocasematch
# Output results for BATS tests
if [ "${automated_test_in_progress:-}" ]; then
echo "_parseDate_found: ${_parseDate_found}"
echo "_parseDate_year: ${_parseDate_year}"
echo "_parseDate_month: ${_parseDate_month}"
echo "_parseDate_monthName: ${_parseDate_monthName}"
echo "_parseDate_day: ${_parseDate_day}"
echo "_parseDate_hour: ${_parseDate_hour}"
echo "_parseDate_minute: ${_parseDate_minute}"
fi
}
_formatDate_() {
# DESC: Reformats dates into user specified formats
# ARGS: $1 (Required) - Date to be formatted
# $2 (Optional) - Format in any format accepted by bash's date command. Examples listed below.
# %F - YYYY-MM-DD
# %D - MM/DD/YY
# %a - Name of weekday in short (like Sun, Mon, Tue, Wed, Thu, Fri, Sat)
# %A - Name of weekday in full (like Sunday, Monday, Tuesday)
# '+%m %d, %Y' - 12 27, 2019
# OUTS: Echo result to STDOUT
# USAGE: _formatDate_ "Jan 10, 2019" "%D"
# NOTE: Defaults to YYYY-MM-DD or $(date +%F)
[[ $# -eq 0 ]] && {
error 'Missing required argument to _formatDate_()'
return 1
}
local d="${1}"
local format="${2:-%F}"
format="${format//+/}"
if command -v gdate >/dev/null 2>&1; then
gdate -d "${d}" "+${format}"
else
date -d "${d}" "+${format}"
fi
}