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#!/bin/sh

## Mail2Khal
#
# Converts an email passed as stdin into a khal calendar event.
# To use in conjunction with neomutt add this to the config:
#
#   macro attach c '<pipe-message>mail2khal<enter>'
#

which khal >/dev/null 2>&1 || \
    ( echo "Install 'khal' to use this script." && exit 1 )

TMP="$(mktemp --tmpdir=$TMPDIR mail2khal.XXXXXXXX.md)"

echo "
> Fill all sections of this markdown file (time and title are
> mandatory). Quote blocks (like this one) are ignored. Empty
> lines are ignored unless in the description section.

# Calendar

university

# Title

# Time
> Valid examples are:
>   [dd/mm[/yyyy]] [hh:mm] [[dd/mm[/yyyy]] [hh:mm]]
>   {today,tomorrow,monday,...,sunday} can be used as date

# Location

# Tags

# Description

# Ignored
> Anything after this point is ignored.

" > "$TMP"
cat - >> "$TMP"

# Make the necessary changes in Nvim
nvim "$TMP"

awk '
    /^>/ { next }
    /^# Calendar$/ {
        state = 1
        cal = ""
        next
    }
    /^# Title$/ {
        state = state + 1
        title = ""
        next
    }
    /^# Time$/ {
        state = state + 1
        time = ""
        next
    }
    /^# Location$/ {
        state = state + 1
        loc = ""
        next
    }
    /^# Tags$/ {
        state = state + 1
        tags = ""
        next
    }
    /^# Description$/ {
        state = state + 1
        desc = ""
        next
    }
    /^# Ignored$/ {
        cmd = "khal new"
        if (length(cal) > 0) {
            cmd = cmd " -a " cal
        }
        if (length(loc) > 0) {
            cmd = cmd " -l \"" loc "\""
        }
        if (length(tags) > 0) {
            cmd = cmd " -g \"" tags "\""
        }
        cmd = cmd " \"" time "\""
        cmd = cmd " \"" title
        if (length(desc) > 0) {
            cmd = cmd " :: " desc
        }
        cmd = cmd "\""
        system(cmd)
        exit
    }
    state == 1 && NF {
        cal = cal $0
    }
    state == 2 && NF {
        title = title $0
    }
    state == 3 && NF {
        time = time $0
    }
    state == 4 && NF {
        loc = loc $0
    }
    state == 5 && NF {
        tags = tags $0
    }
    state == 6 {
        desc = desc "\n" $0
    }
' "$TMP"