124 lines
2.0 KiB
Bash
Executable File
124 lines
2.0 KiB
Bash
Executable File
#!/bin/sh
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########################################
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# name: mp
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# desc: front-end to MPV that displays
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# lyrics text-files before playing
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# a song.
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# main: Jenga Phoenix
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# <jadedctrl@teknik.io>
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# lisc: CC 0
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########################################
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trap "" 2
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#---------------------------------------
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# generic
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# STRING --> STRING
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# Return the first 'word' (space-delimiter) of a string.
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function car {
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local string="$1"
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echo "$string" \
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| awk '{ print $1 }'
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}
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# STRING --> STRING
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# Return all words after the first word of a string.
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function cdr {
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local string="$1"
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local car="$(car "$string")"
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if test $(length "$string") -eq 1; then
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echo ""
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else
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echo "$string" \
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| sed 's/^'"$car"' //'
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fi
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}
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# STRING --> NUMBER
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# Return the length of a string.
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function length {
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local string="$1"
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echo "$string" \
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| wc -w \
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| tr -d ' '
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}
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# NUMBER NUMBER --> NUMBER
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# Add two numbers together.
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function add {
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operator="$1"
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operatee="$2"
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echo "$1 + $2" \
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| bc
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}
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# --------------------------------------
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# NIL --> NUMBER
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# Return the amount of total items.
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function total_items {
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add "$(length "$DISCARD")" "$(length "$ITEMS")"
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}
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# NIL --> NUMBER
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# Return the amount of discarded items.
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function discarded_items {
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echo "$(length "$DISCARD")"
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}
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# --------------------------------------
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# NUMBER --> NIL
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# Handle the return code of `mpv` properly, according
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# to the cause.
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function handle_return {
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local return=$1
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case $return in
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4) # ^C
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# rewind one file <<
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ITEMS="$(car "$DISCARD") $ITEMS"
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DISCARD="$(cdr "$DISCARD")"
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;;
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0) # normal
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# put current file to discard
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DISCARD="$(car "$ITEMS") $DISCARD"
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ITEMS="$(cdr "$ITEMS")"
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;;
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2) # no file
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# don't even discard it-- BURN IT
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ITEMS="$(cdr "$ITEMS")"
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;;
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esac
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}
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# --------------------------------------
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# invocation
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DISCARD=""
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ITEMS="$@"
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while test -n "$ITEMS"; do
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local item="$(car "$ITEMS")"
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cat "${item}.txt" 2> /dev/null
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echo "===$(discarded_items)/$(total_items)==="
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mpv "$item"
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return=$?
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handle_return "$return"
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done
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