add old calsh file
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#!/bin/bash
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# # calsh
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#
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# A bash script to have a limited interactive version of the `cal` command to view the calendar.
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#
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# <p align="center"><img src="https://github.com/ju-sh/calsh/blob/master/screenshots/screenshot.gif?raw=true"/></p>
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#
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# ## Usage
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#
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# calsh [[month] year]
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#
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# where
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#
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# month: a valid month name or number in a format that `date` command accepts. Like June, Jun, 06, 6, etc.
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# year: a valid year in the range 1..9999
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#
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# ## Navigation
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#
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# The default key configuration is:
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#
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# | Key | Effect |
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# |--------+------------------|
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# | l | Next month |
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# | h | Previous month |
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# | j | Next year |
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# | k | Previous year |
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# | J | Next decade |
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# | K | Previous decade |
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# | Ctrl-f | Next century |
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# | Ctrl-b | Previous century |
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#
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# This can be changed by changing the variables in the beginning of the script.
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#
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# Press Esc or q to quit.
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#
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# ## Examples
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#
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# calsh
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#
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# Starts `calsh` with the current month and year.
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#
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# ---
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#
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# calsh 2020
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#
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# Starts `calsh` with the current month of the year 2020.
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#
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# ---
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#
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# calsh Jun 2010
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#
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# Starts `calsh` with the month June of the year 2010.
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function is_whole_num {
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# Returns zero if argument has only digits
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# Otherwise non-zero value is returned
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if (( "$#" == 0 ))
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then
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echo "Error: is_whole_num (function): No arguments" >&2
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return 1
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fi
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case "$1" in
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("" | *[!0-9]*)
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return 1
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esac
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return 0
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}
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function parse_month {
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# Check if argument is a valid month name or number
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# Write parsed month's number to STDOUT
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# Write -1 to STDOUT on error
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if (( "$#" == 0 ))
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then
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echo "Error: parse_month (function): No arguments" >&2
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echo "-1"
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fi
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if is_whole_num "$1" && (( "$1" > 0 )) && (( "$1" < 13 ))
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then
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echo "Debug: month_arg is a valid month num" >&2
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month_num=$1
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else
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echo "Debug: month_arg is not a valid month num" >&2
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month_num=$(date --date="28 $1 2020" +"%m")
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if (( "$?" == 1 ))
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then
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echo "Debug: month_arg is not a valid month name as well" >&2
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echo "-1" # rv
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fi
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fi
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echo "Debug: month_arg is a valid month name" >&2
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echo "$month_num" # rv
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}
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function parse_year {
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# Checks if argument is a natural number less than 9999
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# Write -1 to STDOUT on error
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# Returns parsed year
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if (( "$#" == 0 ))
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then
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echo "Error: parse_year (function): No arguments" >&2
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echo "-1" # rv
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fi
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if is_whole_num "$1" && (( "$1" > 0 )) && (( "$1" < 10000 ))
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then
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echo "Debug: year_arg is a valid year" >&2
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echo "check: year $1" >&2
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echo "$1" # rv
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else
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echo "Debug: year_arg is not a valid year" >&2
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echo "-1" # rv
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fi
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}
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# Configure keys
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n_century=$'\6' # C-f
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p_century=$'\2' # C-b
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n_decade='J'
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p_decade='K'
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n_year='j'
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p_year='k'
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n_month='l'
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p_month='h'
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# Obtain required arguments
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if (( "$#" > 2 ))
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then
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echo "Error: Too many arguments"
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exit 1
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elif (( "$#" == 2 ))
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then
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month_arg=$1
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year_arg=$2
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elif (( "$#" == 1 ))
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then
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month_arg=$(date +%m)
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year_arg=$1
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elif (( "$#" == 0 ))
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then
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month_arg=$(date +%m)
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year_arg=$(date +%Y)
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fi
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echo "$month_arg, $year_arg" >&2
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# Parse month
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month=$(parse_month "$month_arg")
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if (( month == -1 ))
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then
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echo "Error: $month_arg is neither a month number (1..12) nor a name"
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exit 1
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fi
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# Parse year
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year=$(parse_year "$year_arg")
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if (( year == 0 ))
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then
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echo "Error: year $year not in range 1..9999"
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exit 1
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fi
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echo "$month, $year" >&2
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# The event loop
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response='a'
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while [ "$response" != $'\E' ] && [ "$response" != "q" ]
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do
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clear
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cal "$month" "$year"
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read -rn1 response
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# printf '\n%q\n' "$response" >&2
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case "$response" in
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"$n_century")
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# Increment century
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if (( year < 9900 ))
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then
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year=$((year + 100))
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fi;;
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"$p_century")
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# Decrement century
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if (( year > 100 ))
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then
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year=$((year - 100))
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fi;;
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"$n_decade")
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# Increment decade
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if (( year < 9990 ))
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then
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year=$((year + 10))
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fi;;
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"$p_decade")
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# Decrement decade
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if (( year > 10 ))
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then
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year=$((year - 10))
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fi;;
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"$n_year")
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# Increment year
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if (( year < 9999 ))
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then
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year=$((year + 1))
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fi;;
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"$p_year")
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# Decrement year
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if (( year > 1 ))
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then
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year=$((year - 1))
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fi;;
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"$n_month")
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# Increment month
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if (( "$month" == 12 )) && (( "$year" < 9999 ))
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then
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month=1
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year=$((year + 1))
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else
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month=$((month + 1))
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fi;;
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"$p_month")
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# Decrement month
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if (( "$month" == 1 )) && (( "$year" > 1 ))
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then
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month=12
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year=$((year - 1))
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else
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month=$((month - 1))
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fi;;
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esac
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done
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clear
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# Todo:
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# - config file to customize key bindings
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# - add number modifier
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# - use getopt to accept other options of cal
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